Class / Patent application number | Description | Number of patent applications / Date published |
315187000 | Condenser in the supply circuit | 83 |
20080224623 | HALF-WAVE RECTIFICATION CIRCUIT WITH A LOW-PASS FILTER FOR LED LIGHT STRINGS - Disclosed is a low cost LED string circuit design that uses an inexpensive half-wave rectification and low-pass filter circuit that is designed to produce minimal flicker in the LED string that is connected to the circuit. The components of the half-wave rectification and low-pass filter circuit are selected in accordance with design principles that prevent glittering and flickering of the LED string. The circuit components of the half-wave rectification and low-pass filter circuit can be embedded in an outlet plug or as a separate independent unit between an AC power plug and the LED string. | 09-18-2008 |
20090134810 | LED STRING - A light-emitting diode (LED) string is provided. The LED string includes a power plug configured for connecting with a power source to power the LED string; one or more LED sockets configured for electrically connecting with the power plug; one or more LEDs configured for being installed on and electrically connecting with the LED sockets; and a control module configured for being electrically connected with anyone of the LED sockets. The control module includes a control circuit, an input terminal and an output terminal, the control circuit electrically connects with one of the LED sockets via the input terminal and the output terminal and controls a current flowing through the LED string to change from a first value to a second value, thereby controlling the LED string to light. | 05-28-2009 |
20100079076 | LED LIGHT STRING WITHOUT ADDITIONAL RESISTORS - An electrical circuit for use as a string of lights in one embodiment includes a rectifier for converting AC into DC; and a plurality of lamps connected in series, each lamp having an LED, and wherein at least one of the lamps each has a Zener diode connected in series with the LED, a positive terminal of the lamp proximate the rectifier is connected to a positive terminal of an output of the rectifier, and a negative terminal of the lamp distal the rectifier is connected to a negative terminal of the output of the rectifier. In another embodiment, the Zener diode is replaced with a resistor. Hence, no resistors are provided externally of the lamp. | 04-01-2010 |
20100237788 | Flashing light string - A light string includes a load comprising a trigger LED assembly and a lighting assembly connected in series with the trigger LED assembly, the lighting assembly comprising a plurality of series connected lamps comprising an LED; and a rectifier for converting a source of AC into DC which is supplied to the load. The trigger LED assembly is adapted to flash and cause the lamps to flash. In one embodiment the trigger LED assembly includes a trigger LED and a capacitor connected in parallel with the trigger LED. The trigger LED includes a first LED and a second LED. The cathode of the first LED is connected to the cathode of the second LED, the anode of the first LED is connected to the positive terminal of the capacitor, and the anode of the second LED is connected to the negative terminal of the capacitor respectively. | 09-23-2010 |
20110291574 | MULTI-CHANNEL CONSTANT CURRENT SOURCE AND ILLUMINATION SOURCE - A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation. | 12-01-2011 |
20120019156 | LED STRING DRIVER WITH NON-DISSIPATIVE REACTANCE BALANCER - A solid state lighting arrangement constituted of: a power source providing a current which is discontinuous in at least one direction; a plurality of light emitting diode (LED) strings arranged to receive the provided current from the power source; and a plurality of reactance elements, each of the plurality of reactance elements arranged in series with a particular one of the plurality of LED strings, such that current flowing from the power source through each of the LED strings creates a voltage drop across the series arranged reactance element, wherein the voltage drop across each of the series arranged reactance elements responsive to the discontinuous current is at least 10 times greater than the maximum difference between the voltage drops among the plurality of LED strings. | 01-26-2012 |
20120025722 | SECONDARY-SIDE ALTERNATING ENERGY TRANSFER CONTROL WITH INVERTED REFERENCE AND LED-DERIVED POWER SUPPLY - A single magnetic storage element is used to provide power to multiple lighting devices, which may be strings of light-emitting diodes (LEDs) of different color. A switching circuit controls alternating application of energy among the multiple lighting devices and another switching circuit may charge the primary winding to different energy levels to control the intensity of the multiple lighting devices. In particular, the multiple lighting devices may be controlled to provide a desired color profile while dimming the lighting devices, while requiring only a single magnetic storage element for supplying energy to the lighting devices. | 02-02-2012 |
20120062130 | IMAGE DISPLAY APPARATUS - An image display apparatus according to an implementation of the present invention includes: pixel circuits disposed in rows and columns; first power lines and control lines disposed in respective rows; a third power line; second switching transistors disposed at least one for each of the rows and each having a gate terminal connected to the control line disposed in the corresponding row, one of a source terminal and a drain terminal connected to the first power line disposed in the corresponding row, and the other of the source terminal and the drain terminal connected to the third power line; and a power supply unit which supplies the same voltage to the first power lines and the third power line when the second switching transistors are turned ON. | 03-15-2012 |
20120086349 | Decorative Light System - A light string includes a plurality of remote units and a control unit. Each of the plurality of remote units includes a microcontroller and is connected to a plurality of lights. Each microcontroller stores one or more programs for controlling the lights in the plurality of lights. The control unit is connected to the plurality of remote units by a power supply line. The control unit sends information via the power supply line to the plurality of remote units. The information indicates a program of the one or more programs to be executed by the microcontroller of each of the remote units to individually control the plurality of lights. | 04-12-2012 |
20120091906 | AC DRIVEN LIGHT-EMITTING DIODES - Disclosed is a lighting device including a circuit including at least two parallel-connected light-emitting diodes of opposite pole in a first parallel branch and comprising at least two parallel-connected light-emitting diodes of opposite pole in a second parallel branch, and also including a capacitor and a coil. At least one of the diodes emits red light, blue light, and/or white light. | 04-19-2012 |
20120126712 | LIGHT EMITTING DIODE DRIVING CIRCUIT, AND DISPLAY DEVICE HAVING THE SAME - Provided are an LED driving circuit capable of preventing distortion of LED currents and having a high operating speed, and a display device including the LED driving circuit. The LED driving circuit includes a current driving circuit, a dynamic headroom controller and a power supply circuit. The current driving circuit controls current signals flowing through LED strings in response to a first control signal that includes information of an LED current and a current-driving-circuit enabling signal. The dynamic headroom controller generates a dynamic headroom control signal having a voltage level that changes according to a logic state of the current-driving-circuit enabling signal. The power supply circuit generates an LED driving voltage that changes according to the dynamic headroom control signal. | 05-24-2012 |
20120126713 | LED DRIVING APPARATUS - Provided is an LED driving apparatus capable of improving a power factor through a non-insulation type simplified circuit structure, including: a light emitting unit having at least one LED; a rectifier rectifying an alternate current (AC) voltage applied from external power; a power supply unit supplying driving power to the light emitting unit, and having an inductor connected to an output terminal of the light emitting unit; and a switch controller. | 05-24-2012 |
20120153847 | Electronic Circuit for the Use of LEDs in an Alternate Current Power for Illumination Systems - Electronic circuit for LEDs usage without the necessity of using converters or rectifiers takes advantage of the waves in both polarities from the source of alternating current, saving space and minimizing the number of components in the circuits. This circuit is formed by two LEDs series connected in parallel but with an inverse polarity, with or without Zener protection diodes. To this type of circuit, capacitive arrangements can be added to limit the total electric current of the circuit. This way when it operates in a sufficiently high frequency, the LEDs give the optical perception that they are turn on simultaneously. In the implementation of this circuit, the illumination and signaling systems obtains low cost devices, low energetic consumption and excellent illumination levels. | 06-21-2012 |
20120161648 | CURRENT REGULATING CIRCUIT OF LIGHT EMITTING DIODE (LED) STRING AND LED ILLUMINATION DEVICE - An exemplary current regulating circuit of LED string includes a capacitor, an inductor, a diode, a switch and a detection circuit. First and second terminals of the capacitor respectively are connected to a low voltage and a preset voltage. A first terminal of the inductor is connected to the low voltage. Positive and negative terminals of the diode are respectively connected to a second terminal of the inductor and a high voltage. First and second terminals of the switch are respectively connected to the second terminal of the inductor and the preset voltage. The detection circuit detects the low voltage to thereby switch ON-OFF states of the switch in demand. Moreover, a LED illumination device using the current regulating circuit also is provided. | 06-28-2012 |
20120161649 | LED LIGHTING DEVICE AND ILLUMINATION APPARATUS INCLUDING SAME - An LED lighting device includes a power converter for outputting a variable output voltage, two LED lamps being connected in series between output terminals of the power converter; a current detector for detecting an output current from the power converter; a first detector for detecting the output voltage of the power converter and generating a first detection voltage corresponding to the output voltage; a second detector for detecting an applied voltage to one of the two LED lamps and generating a second detection voltage corresponding to the applied voltage; and a controller for controlling the power converter to adjust the output voltage to thereby make the output current coincide with a target value. The controller controls the power converter to decrease the output voltage if at least one of the second detection voltage and the deference between the first and the second detection voltage does not fall within a range. | 06-28-2012 |
20120187853 | LED DRIVER - An LED driver is comprising: at least two LED strings; a rectifier rectifying an alternating current (AC) voltage for supply to the LED strings; at least two balancing capacitors positioned at a current path of each LED string for carrying out a current balancing of the LED strings; at least two path control elements for controlling the current path of each LED string; and a controller controlling the path control elements. | 07-26-2012 |
20120235583 | LIGHT EMITTING ELEMENT WITH A PLURALITY OF CELLS BONDED, METHOD OF MANUFACTURING THE SAME, AND LIGHT EMITTING DEVICE USING THE SAME - The present invention relates to a light emitting device including a light emitting element having a plurality of light emitting cells arranged on a substrate, a first electrode arranged on each light emitting cell of the plurality of light emitting cells, a second electrode arranged between the substrate and each light emitting cell of the plurality of light emitting cells, the second electrode being disposed to face the first electrode. The light emitting device also includes a conductive material electrically connecting the second electrode arranged under a first light emitting cell of the plurality of light emitting cells to the first electrode arranged on an adjacent second light emitting cell of the plurality of light emitting cells, and a control unit configured to control waveforms of a voltage and a current applied to the light emitting element. | 09-20-2012 |
20120248996 | START AUXILIARY DEVICE, BALLAST AND ILLUMINATION DEVICE - The present invention relates to a start auxiliary device for driving a gas discharge lamp cluster, the gas discharge lamp cluster comprising n gas discharge lamps connected in series, the start auxiliary device comprises: a primary start circuit including a primary start capacitor (C | 10-04-2012 |
20120256550 | LED DRIVING CIRCUIT - The present invention is directed to providing an LED driving circuit that can be reduced in size and produced at low cost, and that can effectively prevent a shoot-through current that may flow between a plurality of LED arrays. The LED driving circuit includes a rectifier, a first LED array containing a plurality of LEDs, a second LED array containing a plurality of LEDs; a connection unit for connecting the first and second LED arrays in series relative to the rectifier or for connecting the first and second LED arrays in parallel relative to the rectifier, a control unit for switching the connection of the first and second LED arrays relative to the rectifier from parallel to series by controlling the connection unit, and a reverse current preventing diode disposed between the first LED array and the second LED array. | 10-11-2012 |
20120299489 | LIGHT-EMITTING DIODE DRIVING DEVICE FOR REDUCING LIGHT OFF PERIOD - An LED driving apparatus is provided. The apparatus includes an LED Portion | 11-29-2012 |
20130043798 | LOAD DRIVING CIRCUIT WITH CHARGE SPIKE PROTECTION - A load driving circuit comprises a converting circuit, a converting controller, a load driving modulator, and a charge spike protection circuit. The converting circuit is adapted to be coupled to an output power source and supplies a driving power source to drive a load. The converting circuit has an output capacitance coupled to an output end thereof. The converting controller controls an amount of the driving power source responsive to a current or a voltage of the load. The load driving modulator and the load, connected in series, are coupled to the output end and so the load driving modulator adjusts an electronic state of the load. The charge spike protection circuit is coupled to the output capacitance and at least one connecting node of the load and the load driving modulator to provide a unidirectional charge release path to the output capacitance. | 02-21-2013 |
20130106300 | PASSIVE LC BALLAST AND METHOD OF MANUFACTURING A PASSIVE LC BALLAST | 05-02-2013 |
20130140998 | CIRCUITRY AND METHOD FOR DRIVING LED DISPLAY - This disclosure provides a circuit and a method for driving an LED display. The driving circuit comprises a selection circuit for selecting a first light emitter from the plurality of light emitters, a pre-charging circuit for charging an equivalent capacitor of the display panel with respect to the selected first light emitter, and a power circuit for supplying power to the first light emitter after the first light emitter is selected, wherein the power circuit is configured to supply a driving current to the first light emitter in one or more stages. The driving circuit and method of this disclosure can be used to significantly increase the refresh rate and resolution of the LED display. | 06-06-2013 |
20130162151 | METHODS AND CIRCUITS FOR CONTROLLING LIGHTING CHARACTERISTICS OF SOLID STATE LIGHTING DEVICES AND LIGHTING APPARATUS INCORPORATING SUCH METHODS AND/OR CIRCUITS - A method of controlling a solid state lighting apparatus can be provided by receiving a solid state lighting characteristic selection signal at a solid state lighting apparatus and selecting, responsive to the solid state lighting characteristic selection signal, a solid state lighting model that defines a relationship between different lighting parameters used to vary light output from the solid state lighting apparatus responsive to a user input provided to the solid state lighting apparatus. | 06-27-2013 |
20130313983 | LIGHTING UNIT WITH LED STRIP - What is described is a lighting unit | 11-28-2013 |
20130342116 | LED FLUORESCENT LAMP - A light-emitting diode (LED) fluorescent lamp which can replace a typical fluorescent lamp is provided. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an commonly connected to second ends of the first and third capacitors and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode commonly connected to second ends of the second and fourth capacitors. The LED fluorescent lamp can replace a typical fluorescent lamp without a requirement of the installation of additional equipment or the change of wiring. | 12-26-2013 |
20130342117 | DRIVING CIRCUIT FOR A LIGHT EMITTING DIODE LIGHTING APPARATUS - A driving circuit for a light emitting diode lighting apparatus includes a driving data memory device in which central portion driving data for driving the light emitting diodes are separated into many sections within one cycle of the driving power; a drive controller for reading the central driving data, charging driving data, and outer driving data stored in the driving data memory device; a first D/A converter for converting digital central driving data and outer driving data output from the drive controller to analog signals, and a second D/A converter for converting charging driving data to an analog signal; a static current driving device having static current driving devices respectively connected to tabs of light emitting diodes according to an output signal of the first D/A converter; and a charging static current driving device for charging the charging capacitor according to the output signal from the second D/A converter. | 12-26-2013 |
20140001970 | LED FLUORESCENT LAMP | 01-02-2014 |
20140015428 | LED LIGHT SOURCE - LED light source comprising a string of LED loads (LED | 01-16-2014 |
20140049171 | LED DRIVER HAVING COMPENSATION CAPACITOR SET - Configurations for an LED driver are disclosed. The proposed LED driver receives an input voltage, drives an LED and includes a compensation capacitor set including a first and a second capacitors connected to each other in series, wherein the first capacitor is electrically connected to the LED, the second capacitor is grounded, the compensation capacitor set provides a compensation voltage to the LED such that the LED is conductible when an instantaneous voltage value of the input voltage is lower than an LED conduction voltage. | 02-20-2014 |
20140070715 | LED constant-current drive circuit - An LED constant-current drive circuit includes a BUCK circuit consisting of a transformer T | 03-13-2014 |
20140070716 | LIGHT-EMITTING DEVICE - A light-emitting device includes a power module, a first light-emitting module, a second light-emitting module, a third light-emitting module, and a control module. The power module is configured to rectify an AC voltage for providing a periodic driving voltage. The first, second, third light-emitting modules are connected in series. The control module is configured to make the first, second, third light-emitting modules being driven by the driving voltage in response to different driving stages in a cycle period of a driving voltage. An average-diode-junction-area of the first light-emitting module is different from an average-diode-junction-area of the second light-emitting module or an average-diode-junction-area of the third light-emitting module. | 03-13-2014 |
20140111103 | Buck-Store and Boost-Restore Converter - A system includes: a first converter for receiving a pre-stage input DC voltage from a power source, and providing a pre-stage output DC voltage including a first DC voltage or a second DC voltage; a modulator the modulator controlling the first converter; a second converter, coupled to the first converter; and a controller, the controller controlling an operation mode of the second converter and notifying the modulator about the operation mode of the second converter. The modulator and the controller receive an external voltage indication signal indicating whether the pre-stage output DC voltage is the first DC voltage or the second DC voltage. The modulator controls the first converter to output the pre-stage output DC voltage based on the voltage indication signal. The modulator notifies the controller about whether the pre-stage output DC voltage reaches a target level. | 04-24-2014 |
20140132164 | EMERGENCY LIGHTING CONVERSION FOR LED STRINGS - Emergency lighting devices and methods are disclosed. An emergency lighting device includes a passive resonant converter circuit configured to be coupled to an emergency lighting module and to an input end of a group of solid state emitters, at which the group of solid state emitters receives a normal operation current from an LED driver. The passive resonant converter circuit is configured to receive an emergency operation current from the emergency lighting module and to provide a converted emergency operation current to the group of solid state emitters at an emergency input of the group of solid state emitters in response to the emergency operation current. The emergency lighting module may be a fluorescent emergency lighting module. | 05-15-2014 |
20140145628 | AC DRIVEN LIGHTING SYSTEMS CAPABLE OF AVOIDING DARK ZONE - Disclosed are methods and lighting system with LEDs. An exemplified system comprises series-coupled light-emitting diodes, an integrated circuit, and an energy storage apparatus. The series-coupled light-emitting diodes are divided into several LED groups coupled in series. The integrated circuit comprises nodes respectively coupled to the LED groups, for providing a driving current to selectively flow through at least one of the LED groups. The energy storage apparatus has two ends coupled to a predetermined LED in a predetermined LED group. When the driving current flows through the predetermined LED group the energy storage apparatus energizes; and when the driving current does not flow through the predetermined LED group the energy storage apparatus de-energizes to illuminate the predetermined LED. | 05-29-2014 |
20140145629 | LED DRIVING APPARATUS AND OPERATING METHOD THEREOF - A LED driving apparatus and an operating method thereof are disclosed. The LED driving apparatus includes a power, at least one LED string, a LED control unit, and an input voltage detection circuit. At least one LED string is coupled to the power and includes LEDs connected in series. The input voltage detection circuit is coupled to two ends of at least one LED of the LEDs respectively and used to judge whether an input voltage is lower than a LED conducting voltage. The input voltage detection circuit includes a charging capacitance to be charged when the at least one LED string is conducted. If the judged result of the input voltage detection circuit is yes, the input voltage detection circuit will control the charging capacitance having a charging voltage to discharge to the at least one LED string. | 05-29-2014 |
20140159592 | LED LIGHT TUBE COMPATIBLE WITH LIGHT FIXTURE HAVING ELECTRONIC BALLAST OR MAGNETIC BALLAST - The LED light tube compatible with a light fixture having an ballast has a translucent tube and an LED light bar mounted in the translucent tube. and having at least one waveform conversion circuit having multiple rectifier diodes and at least one LED light string connected to the at least one waveform conversion circuit, wherein a recovery time of each rectifier diode is under 1 μs; the ballast determines the at least one waveform conversion circuit and the at least one LED light string as low impedance loads, thus, the ballast does not output a high voltage AC power and burn the LED light tube; a recovery time of each rectifier diode is also short such that the LED light tube can endure a high frequency AC power outputted by the ballast. As such, the LED light tube is compatible with the light fixture. | 06-12-2014 |
20140175995 | METHOD AND ARRANGEMENT FOR TRIGGERING A SERIES SPARK GAP - A series spark gap includes at least three partial spark gaps. In a continuous operation mode, a supply voltage acting over the partial spark gaps is divided by a first voltage dividing mechanism. During triggering, more than half of the partial spark gaps are bypassed by using a bypass mechanism such that more than half of the supply voltage acts over the partial spark gaps that are not bypassed, whereby the partial spark gap or the partial spark gaps that are not bypassed ignite. The voltage acting over the bypassed partial spark gaps is divided asymmetrically using the bypass mechanism, whereby the bypassed partial spark gaps ignite sequentially in the order determined by the asymmetric voltage division. | 06-26-2014 |
20140197748 | LED Lighting Tube - The LED lighting tube that is compatible with an electronic ballast has two snubber circuits, a waveform conversion circuit, and at least one LED light string. The snubber circuits are connected to terminals of the LED lighting tube, and input terminals of each snubber circuit are connected to electrode pins of a corresponding terminal, and each snubber circuit has at least one resistor connected in series between the electrode pins of the corresponding terminal. The waveform conversion circuit has multiple rectifier diodes, wherein input terminals of the waveform conversion circuit are respectively connected to output terminals of the snubber circuits, wherein a recovery time of each rectifier diode is under 2.5 us. Two ends of the at least one LED light string are respectively connected to output terminals of the waveform conversion circuit, wherein each one of the at least one LED light string comprises multiple LED units connected in series. | 07-17-2014 |
20140210366 | BOOST CONVERTER TOPOLOGY FOR HIGH EFFICIENCY AND LOW BATTERY VOLTAGE SUPPORT - A method and apparatus for a boost converter topology for low battery voltage support. In the method, an input voltage is boosted by closing first through third switches and then opening a fourth switch to charge a capacitor. The first and second switches are then opened. The voltage is then doubled by closing the third and fourth switches to discharge the first capacitor into a second capacitor and charging a third capacitor. A further embodiment provides an additional method for selectively boosting an input voltage to an electronic device. The method first characterizes the efficiency of a circuit, and then determines a crossover point for a ratio of output voltage to input voltage, and then enabling or disabling a voltage boost converter based on the crossover point. | 07-31-2014 |
20140239827 | LED FLUORESCENT LAMP - A light emitting diode (LED) fluorescent lamp includes an external connection pin including a first connection pin and a second connection pin, an LED array including a plurality of light emitting diodes (LEDs) connected in series, a current stabilizing capacitor connected in parallel to the LED array, and a capacitive element unit connected between the LED array and the external connection pin and configured to vary an impedance of a fluorescent lamp ballast connected to the capacitive element unit through the external connection pin. | 08-28-2014 |
20140239828 | Dim to warm lighting module - The present invention is a lighting module, in particular, a lighting module that emits warmer color light as it dims. The lighting module preferably has a dimmable power source and a printed circuit board having at least two series of LEDs. The first LED series has a resistor and three LEDs that operate at full brightness at a first voltage, e.g. 12 | 08-28-2014 |
20140265892 | LED Linear Regulator Circuit with Improved Power Factor - The present disclosure involves a device. The device includes a rectifier coupled to receive energy from an alternating current (AC) voltage source. A capacitor is coupled to the rectifier. A plurality of LEDs and a current limiter are coupled in series. The current limiter is configured to limit a current through the LEDs. The plurality of LEDs and the current limiter are collectively coupled to the capacitor in parallel. A current controller is coupled to both the capacitor and the current limiter in series. The current controller is configured to control at least a charging current of the capacitor. The device has a first current path during a first period of operation and a second current path during a second period of operation. The capacitor charges during the first period of operation and discharges during the second period of operation. | 09-18-2014 |
20140300286 | LIGHT STRING - A light string includes a number of lights. The lights are electrically connected in series and powered by an AC power supply. At least one capacitor is connected in parallel to one of the lights. Each light or a part of lights of the light string of the present invention is electrically connected in parallel to a capacitor. When the light string is powered on, the capacitor is charged and absorbs a surge current which may occur. Thus, the voltage dropped on each light rises slowly and the lights are safe. The capacitor also performs power compensation and electrical connection. When the filament of the light bulb fails and the bulb remains in the light string, or when the bulb is removed from its socket for replacement, the closed path for flow of electrical current is still closed. | 10-09-2014 |
20140333217 | FEEDBACK CONTROL CIRCUIT AND LED DRIVING CIRCUIT - A feedback control circuit, adapted to control a converting circuit to transform an input power into an output voltage for driving an LED module. The feedback control circuit comprises a detection circuit, a PWM circuit, a PWM logic control circuit and a PWM control circuit. The detection circuit is coupled to at least one LED string of the LED module and generates at least one detection signal. The PWM circuit comprises a capacitance, a charging circuit and a discharging circuit, and determines a capacitance voltage of the capacitance to increase, decrease, or maintain. The PWM logic control circuit compares a level of the least one detection signal with a high reference level and a low reference level to control the PWM circuit to adjust the capacitance voltage. The PWM control circuit controls the converting circuit to execute the power transformation in response to the capacitance voltage of the capacitance. | 11-13-2014 |
20150008834 | LOSSLESS FORWARD VOLTAGE MATCHING NETWORK FOR LED DRIVERS - A lossless LED forward voltage matching network connected between an AC source and a driver of an LED array, where the LED array is series connected and sequentially activates as the output voltage of the LED driver exceeds the respective forward voltages of the LED arrays. The matching network reduces the voltage from the AC source to approximate the total of the forward voltages of the series connected LED arrays to increase the efficiency of the device. | 01-08-2015 |
20150048746 | LED FLUORESCENT LAMP - A light-emitting diode (LED) fluorescent lamp which can replace a typical fluorescent lamp is provided. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an commonly connected to second ends of the first and third capacitors and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode commonly connected to second ends of the second and fourth capacitors. The LED fluorescent lamp can replace a typical fluorescent lamp without a requirement of the installation of additional equipment or the change of wiring. | 02-19-2015 |
20150382414 | Sequential Linear LED System With Low Output Ripple - A sequential linear light emitting diode (LED) system with a low output ripple is disclosed. In one embodiment, the a sequential linear LED system comprises a bridge rectifier for generating a DC voltage, a diode for receiving the DC voltage, a capacitor coupled to the diode, a current regulator coupled to the capacitor for controlling the charging of the capacitor, and a plurality of segments coupled to the diode, each segment comprising an LED string and current regulator. | 12-31-2015 |
20160007420 | LED LIGHTING DEVICE - An LED lighting device comprises: a rectification circuit unit for receiving input power from a power source unit and outputting a rectified power; an LED unit having a plurality of LED channels connected in series and a resistor unit connected to the last end of the LED channels; a current sensing resistor; and a switch circuit unit comprising a plurality of switches, wherein an nth switch is connected to the rear end of an nth LED channel so as to control an operation of the nth LED channel and is controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor. | 01-07-2016 |
20160037593 | ILLUMINATION DEVICE AND ILLUMINATION FIXTURE - An illumination device includes a main light source block having a plurality of main light sources and a plurality of current limiters, and an auxiliary light source block having an auxiliary light source and a constant-current unit. A series circuit of the auxiliary light source and the constant-current unit is electrically connected in parallel with the main light source block, between first and second output terminals of a rectifier. A smoothing capacitor is electrically connected in parallel with a specific main light source among the plurality of main light sources. The specific main light source and a corresponding current limiter are electrically connected in parallel with the series circuit of the auxiliary light source and the constant-current unit. | 02-04-2016 |
20160037594 | LIGHTING DEVICE, ILLUMINATING DEVICE AND LIGHT FIXTURE - A lighting device includes a rectifier, a constant current regulator and a charge-discharge circuit. The constant current regulator is electrically connected in series with first and second solid-state light-emitting element arrays between a pair of output terminals of the rectifier. The constant current regulator is configured to adjust a current flowing through the second solid-state light-emitting element array to a constant current. The charge-discharge circuit is electrically connected in series with the first solid-state light-emitting element array between the pair of output terminals of the rectifier. The charge-discharge circuit includes a charge storage element, and is configured so that a charge current flows to the charge storage element through the first solid-state light-emitting element array, and so that a discharge current flows from the charge storage element to the second solid-state light-emitting element array. | 02-04-2016 |
20160113098 | LIGHT STRING - A light string includes a plurality of lights and a plurality of non-polarity capacitor corresponding to the lights; wherein, the lights are electrically connected in series and to be powered by an AC power supply; each of the non-polarity capacitor is connected in parallel to a corresponding one of the lights. When the light string is powered on, the non-polarity capacitor is charged and absorbs the surge current which may occur. Thus, the voltage dropped on each light rises slowly and the lights are safe. The non-polarity capacitor also performs power compensation and electrical connection. | 04-21-2016 |
20160381743 | LED LIGHTING DEVICE - A light emitting diode (LED) lighting device includes a circuit for receiving an input power from a power source and outputting a rectified power, an LED unit including a plurality of LED channels connected in series, each LED channel having a front end and a rear end, a current sensing resistor, and a switch circuit unit. The switch circuit unit includes a plurality of switches, and an N | 12-29-2016 |
20180027617 | LED LIGHTING DEVICE | 01-25-2018 |
315188000 | Condenser in shunt to load and supply | 29 |
20110309757 | ELECTRICAL CIRCUIT FOR DRIVING LEDS IN DISSIMILAR COLOR STRING LENGTHS - An electrical circuit is disclosed. The electrical circuit comprises a plurality of color strings coupled in series, where each color string has at least one lamp, preferably a light emitting diode. The color strings may be of dissimilar length and may contain light emitting diodes of different colors. In one embodiment, a switch coupled in parallel with one of the color strings is configured to shunt power away from the color string to a power supply. In another embodiment, a switch coupled in parallel with one of the color strings is configured to shunt power away from the color string to one or more other color strings. In several embodiments, passive storage elements are utilized to store shunted power. In another embodiment, a current injector is configured to inject or remove current from a node adjacent to a color string. In several embodiments the invention is implemented as a light emitting diode driver integrated circuit or chip. Methods are disclosed for producing a desired light output utilizing color strings that may be of dissimilar length and that may contain light emitting diodes of different colors. | 12-22-2011 |
20110316433 | SWITCHING SPARK GAP - The present invention relates to a controlled truncating radio connection for a high-voltage impulse test system, preferably for quality assurance of power transformers. According to the invention, the truncating radio connection is expanded by an additional damping unit, made of a serial damping resistance and a damping inductance having a radio connection connected in parallel thereto, and thereby combines the functionalities of a truncating radio connection and an overshoot compensation in only one auxiliary component. | 12-29-2011 |
20120081015 | Method And Apparatus For Outputting Light In A Led-Based Lighting System - Light Emitting Diodes (LEDs) are increasingly used in illumination applications. To control multiple Light Emitting Diodes (LEDs), or any other controllable light source, this document introduces a single-wire multiple-LED power and control system. Specifically, individually controlled LED units are arranged in a series configuration that is driven by a control unit located at the head of the series. Each of the individually controlled LED units may comprise more than one LED that is also individually controllable. The head-end control unit provides both electrical power and control signals down a single wire to drive all of the LED units in the series in a manner that allows each LED unit to be controlled individually or in assigned groups. | 04-05-2012 |
20120098442 | SYNCHRONOUS REGULATION FOR LED STRING DRIVER - A light emitting diode (LED) based luminaire driving arrangement constituted of: a switched driver; a plurality of LED based luminaires arranged to receive power from the switched driver; at least one electronically controlled switch in series with at least one of the plurality of LED based luminaires and arranged to alternatively pass current through the at least one LED based luminaire when closed and prevent the flow of current through the at least one LED based luminaire when opened; and at least one synchronous driver in communication with the at least one electronically controlled switch, the at least one synchronous driver arranged to close the at least one electronically controlled switch only when the switched driver is actively supplying power. | 04-26-2012 |
20120112649 | LED BACKLIGHT DEVICE - An LED backlight device includes an inverter having an input connected to a DC power supply to provide an output AC current. A plurality of transformers are each configured to drop AC current input from the inverter. Input sides of the transformers are connected in series to an output of the inverter and output sides of the transformers are disposed in parallel. A plurality of full-wave rectification circuits are respectively connected to the output sides of the transformers and full-wave rectify the dropped AC currents, respectively. A plurality of smoothing circuits are respectively connected to outputs of the full-wave rectification circuits, and are configured to smooth the full-wave rectified currents to output DC currents, respectively. A plurality of LED strings are respectively connected to the outputs of the smoothing circuits and each of the LED strings have a plurality of LEDs. | 05-10-2012 |
20120161650 | LED DRIVER CIRCUIT - An LED driver circuit includes: a bridge rectifier, a first compensation capacitor, a second compensation capacitor, and an LED module. The bridge rectifier is connected to an AC input power for producing a rectification output power. The first compensation capacitor is connected to a first rectification output terminal and an AC input terminal of the bridge rectifier. The second compensation capacitor is connected to a second rectification terminal and the AC input terminal of the bridge rectifier. The LED module is connected to the first rectification output terminal and the second rectification output terminal of the bridge rectifier. The first and second compensation capacitors in the present invention can effectively improve the total current harmonic distortion of the LED module and its utilization. | 06-28-2012 |
20120217884 | CONTROL CIRCUIT FOR LIGHT EMITTING DIODE ARRANGEMENTS - A control circuit ( | 08-30-2012 |
20120256551 | Ballast circuit for LED lamp - The ballast circuit for an LED lamp includes a surge absorber circuit that includes a capacitor C | 10-11-2012 |
20120280630 | CONSTANT CURRENT DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND LIGHTING APPARATUS - A constant current driving circuit of a light emitting diode (LED) including a control unit, a buck converter, and a compensation unit is provided. The control unit has an input terminal and an output terminal, and outputs a control signal through the output terminal. The buck converter is coupled to an input power, and is coupled between the output terminal of the control unit and an LED string. The compensation unit is coupled between the LED string and the input terminal of the control unit. The control unit receives a compensation signal of the compensation unit through the input terminal. Besides, a lighting apparatus is also provided. | 11-08-2012 |
20120286678 | DRIVE CIRCUIT FOR REALIZING ACCURATE CONSTANT CURRENT OF MULTIPLE LEDS - A drive circuit for realizing accurate constant current of multiple LEDs is disclosed. The drive circuit comprises a high-frequency impulse Alternating Current (AC) power carrying N circuit units with same structure. Each of the circuit unit comprises a rectifier filter circuit, a blocking capacitor C | 11-15-2012 |
20120313537 | LED Power Supply Device - An LED power supply device may include a power supply to control an LED component, a control unit to control the power supply, the control unit having a control interface for applying external control signals to the power supply, and a voltage supply unit connected to a connection of the power supply, wherein the control unit receives operating voltage from the voltage supply unit for continuous operation in an activated and non-activated control state of the LED component, wherein the voltage supply unit comprises a capacitor coupled to an output side of the power supply, the capacitor configured to supply a capacitor voltage as operating voltage to the LED power supply device, and wherein the control unit is configured to charge the capacitor using pulse-like control of the power supply such that, in the non-activated control state, a maximum charging voltage lies below the LED threshold voltage. | 12-13-2012 |
20130069547 | SOLID-STATE LIGHTING APPARATUS AND METHODS USING ENERGY STORAGE - Some embodiments provide a lighting apparatus including a plurality of lighting circuits coupled in series. Each lighting circuit includes a control circuit configured to selectively provide current to at least one LED and at least one charge storage device coupled to the at least one LED. The control circuit may be configured to cause the at least one charge storage device to be selectively charged from a current source and to be discharged via the at least one LED responsive to a varying input. For example, the control circuit may be configured to limit current through the at least one LED to thereby divert current to the at least one charge storage device. | 03-21-2013 |
20130076253 | LIGHT EMITTING DIODE DRIVING APPARATUS - Disclosed herein is a light emitting diode (LED) driving apparatus including: at least one energy storages connected in series with each other; a plurality of LEDs each connected in parallel with each of the energy storages; and a switching control unit selectively connecting the at least one energy storages according to a level of applied voltage to charge/discharge voltage in/from the selected energy storages and control driving of the LEDs by the charging/discharging operation. Therefore, it is possible to easily drive the LEDs without a converter. | 03-28-2013 |
20130181620 | MULTI-OUTPUT SELF-BALANCING POWER CIRCUIT - The present invention relates to a multi-output self-balancing power circuit. In one embodiment, a multi-output self-balancing power circuit can include: a transformer formed by a primary winding and n (e.g., greater than 2) series connected secondary windings; n output circuits corresponding to the n secondary windings, where each of the n output circuits can include a rectifier diode and a filter capacitor, and a load can be parallel coupled with the filter capacitor; n output circuits series coupled between a first output terminal of a first secondary winding and a second output terminal of an n | 07-18-2013 |
20130187555 | Flicker-Free LED Driver Circuit with High Power Factor - A flicker-free LED driver circuit with a high power factor has a rectifying unit connected with an AC power source, an LED module connected in series with the rectifying unit, a capacitor module connected in parallel with the LED module, and a constant current circuit connected in series with the LED module and the capacitor module. When the voltage output by the rectifying unit is smaller than a junction voltage of the LED module, the capacitor module discharges to the LED module so that the LED module does not go out, thereby eliminating the flickering. The input impedance of the rectifying unit can be regarded as a capacitive reactance element connected in parallel with a nonlinear resistive element. The internal resistance of the constant current source approaches infinity. Therefore, the power factor of the flicker-free LED driver circuit approximates 1, achieving a high power factor. | 07-25-2013 |
20130207558 | ILLUMINATION DEVICE, ILLUMINATION SYSTEM, AND LAMP - The present invention provides an illumination device, an illumination system, and a lamp. The illumination system includes the illumination device and a light modulation module. The illumination device includes a light emitting diode (LED) array, an alternating current (AC) current source, and an output power control module. The AC current source is electrically coupled to the LED array. The output power control module is electrically coupled to the LED array and the AC current source. The LED array, the AC current source, and the output power control module together form a closed-loop control loop. The light modulation module is electrically coupled to the closed-loop control loop for modulating illumination brightness of the LED. | 08-15-2013 |
20130313984 | Actuating a Plurality of Series-Connected Luminous Elements - A circuit for actuating a plurality of light-emitting means which are connected in series, comprising a plurality of electronic switches, which can be actuated depending on a rectified system voltage. The plurality of electronic switches are arranged in parallel with at least some of the light-emitting means, wherein each of the plurality of electronic switches short-circuits on activation of at least one of the light-emitting means connected in series. At least one energy store is connected in parallel with a first group of light- emitting means during a charge phase by virtue of the electronic switches, and it is connected in parallel with a second group of light-emitting means during a discharge phase by virtue of the electronic switches. | 11-28-2013 |
20140077709 | SOLID-STATE LIGHTING APPARATUS AND METHODS USING ENERGY STORAGE WITH SEGMENT CONTROL - A lighting apparatus includes a rectifier circuit configured to be coupled to an AC source and to produce a rectified voltage from an AC voltage and a string including at least two serially-connected LED segments and coupled to the rectifier circuit. A segment control circuit is configured to selectively bypass at least one segment of the string responsive to the rectified voltage. An energy storage circuit is coupled to the rectifier circuit and controls current flow between at least one energy storage device and the string. A control circuit controls the segment control circuit and the energy storage circuit. The segment control circuit may support a current from the rectifier circuit through all of the segments in the string circuit at a peak of the rectified voltage and the energy storage circuit may charge the at least one energy storage device to a voltage near the peak of the rectified voltage. | 03-20-2014 |
20140191672 | LOAD ADAPTER WITH TOTAL HARMONIC DISTORTION REDUCTION - A low THD load adapter system is disclosed. The load adapter system includes a first lighting module and a second lighting module connected parallel to the first lighting module. During each AC cycle the first lighting module conducts current for a first portion of the cycle and the second lighting module conducts current for a second portion of the cycle. When combined, the total current drawn from the power source substantially tracks the shape of the applied AC voltage. Accordingly, there is minimal distortion, and low total harmonic distortion level is achieved. | 07-10-2014 |
20140203717 | SOLID-STATE LIGHTING APPARATUS WITH FILAMENT IMITATION FOR USE WITH FLORESCENT BALLASTS - A lighting apparatus includes a solid-state lighting circuit, a ballast connection port including first and second terminals and a filament-imitating impedance coupled between the first and a second terminals of the ballast connection port and to an input terminal of the solid-state lighting circuit. The filament-imitating impedance may be configured to transfer power at a nominal frequency of an output produced by the ballast and to provide an impedance between the first and second terminals of the ballast connection port that prevents shutdown of the ballast. In some embodiments, the filament-imitating impedance may vary with temperature, e.g., the filament-imitating impedance may be configured to imitate a temperature dependence of a fluorescent tube filament. The lighting apparatus may be included in a fluorescent lamp replacement lamp. | 07-24-2014 |
20140210367 | DRIVING A LIGHT EMITTING DIODE CIRCUIT - An apparatus for driving a light emitting diode circuit ( | 07-31-2014 |
20140252967 | SOLID STATE LIGHTING APPARATUS AND CIRCUITS INCLUDING LED SEGMENTS CONFIGURED FOR TARGETED SPECTRAL POWER DISTRIBUTION AND METHODS OF OPERATING THE SAME - A dimmable solid state lighting apparatus can include a plurality of light emitting diode (LED) segments including a first LED segment that can have a targeted spectral power distribution for light emitted from the apparatus that is different than spectral power distributions for other LED segments included in the plurality of LED segments. An LED segment selection circuit can be configured to selectively control current through the plurality of LED segments to shift the light emitted by the apparatus to the targeted spectral power distribution responsive to dimming input. | 09-11-2014 |
20140300287 | LIGHT STRING - A light string includes a plurality of incandescent filament lamps. The incandescent filament lamps are electrically connected in series and powered by an AC power supply. Each incandescent filament lamp is connected in parallel to a capacitor. The capacitors are polarized electrolytic capacitors. A capacitance of each capacitor is 47 microfarads˜120 microfarads. A rated voltage of each capacitor is 16 volts ˜100 volts and is higher than a rated voltage of each incandescent filament lamp. When one of the incandescent filament lamps is failed, the capacitor with which the failed one of the incandescent filament lamps is connected in parallel operates normally and performs power compensation and electrical connection during its repeatedly charging and discharging. When the light string is powered on, the capacitor is charged and absorbs the surge current which may occur. Thus, the voltage dropped on each light rises slowly and the lights are safe. | 10-09-2014 |
20140312791 | SOLID-STATE LIGHTING APPARATUS AND METHODS USING ENERGY STORAGE - Some embodiments provide a lighting apparatus including a plurality of lighting circuits coupled in series. Each lighting circuit includes a control circuit configured to selectively provide current to at least one LED and at least one charge storage device coupled to the at least one LED. The control circuit may be configured to cause the at least one charge storage device to be selectively charged from a current source and to be discharged via the at least one LED responsive to a varying input. For example, the control circuit may be configured to limit current through the at least one LED to thereby divert current to the at least one charge storage device. | 10-23-2014 |
20150069923 | Lighting Color Control - A lighting device includes a plurality of light emitting diodes (LEDs) configured to emit a light. The lighting device further includes a color controller configured to repeatedly assert and deactivate a control signal to control whether one or more LEDs of the plurality of LEDs are turned on or turned off. The color controller asserts the control signal for a first time period and deactivates the control signal for a second time period, where a color of the light emitted by the plurality of LEDs depends on the first time period and the second time period. The color controller changes the color of the light emitted by the plurality of LEDs by changing one or both of the first time period and the second time period. | 03-12-2015 |
20150108909 | CONTROLLING SEMICONDUCTOR LIGHTING ELEMENTS ON THE BASIS OF THE BYPASS STATE OF ADJACENT SEMICONDUCTOR LIGHTING ELEMENTS - A circuit for actuating semiconductor light-emitting elements, wherein the circuit is supplied by a rectified mains voltage, may include at least two series-connected segments, which each have one or more series-connected semiconductor light-emitting elements, wherein the semiconductor light-emitting elements in at least two of the segments are different, which results in different forward voltages of the segments, and in each case one driver for actuating a segment, wherein the driver has at least one electronic switch, by means of which the segment may be bypassed, wherein the circuit arrangement is designed to decide to bypass the segment assigned to the circuit arrangement, on the basis of an instantaneous value of the rectified mains voltage and on the basis of the bypass state of the adjacent segments. | 04-23-2015 |
20150296575 | DRIVER FOR LED LIGHTING AND METHOD OF DRIVING LED LIGHTING - The present invention provides a driver for LED lighting having a plurality of LEDs, the driver receiving AC input power from an AC power source and including a voltage multiplier for supplying a rectified output power to the LEDs to produce a luminous flux. Also provided is a method of driving LED lighting having a plurality of LEDs, the method including: receiving AC input power having an input voltage; multiplying the input voltage to supply a multiplied output voltage to the LEDs; and rectifying the AC input power to supply a rectified output power to the LEDs to produce a luminous flux. | 10-15-2015 |
20150351181 | DRIVE CIRCUIT DEVICE FOR FLICKER-FREE LED - A drive circuit device for a flicker-free LED is revealed. It comprises a drive circuit having a rectifier connecting to an AC power supply and to a plurality of LEDs in series, wherein each of the plurality of LEDs is disposed in parallel with a multilayer capacitor. | 12-03-2015 |
20150359051 | LOW FLICKER LED DRIVING CIRCUIT WITH HIGH POWER FACTOR - An LED-based lighting apparatus comprises a rectified AC voltage source having a rectified output connected to a storage capacitor through a switching device, a plurality of LED segments controlled by a linear driving circuit and at least one charging path connected between the LED segments and the storage capacitor. One or more controllable linear LED driving units may be connected in parallel with the storage capacitor to provide balance between reducing flicker and increasing power factor of the lighting apparatus. | 12-10-2015 |