Class / Patent application number | Description | Number of patent applications / Date published |
315254000 | Transformer in the supply circuit | 37 |
20080252231 | LIGHT SOURCE DRIVING DEVICE - A light source driving device for driving a light source module ( | 10-16-2008 |
20090102392 | Protection architecture for multi-lamp system - The present invention discloses a protection architecture for a multi-lamp system, which applies to a multi-lamp driving system for driving a plurality of lamp loops. The present invention is characterized in that two opposite-phase loads of a loop are separately defined to be a first load and a second load, and that a voltage-division/detection loop is formed via cascading a first voltage-division element to a second voltage-division element and is coupled to between the first load and the second load to detect an abnormal current, wherein the second voltage-division element is coupled to a ground terminal, and wherein a signal-acquiring terminal is coupled to between the first voltage-division element and the second voltage-division element and acquires an abnormal voltage signal for a protection unit from the abnormal current, and wherein the protection unit detects the abnormal voltage signal and shuts off the driving system. | 04-23-2009 |
20090184653 | SYNCHRONOUS OPERATING SYSTEM FOR DISCHARGE TUBE LIGHTING APPARATUSES, DISCHARGE TUBE LIGHTING APPARATUS, AND SEMICONDUCTOR INTEGRATED CIRCUIT - A synchronous operating system for operating a plurality of discharge tube lighting apparatuses at the same frequency and same phase includes (1) a resonant circuit including a capacitor C | 07-23-2009 |
20090261748 | Modified dimming LED driver - A driver circuit produces variable current output for an LED lighting system providing improved dimming capability and greater power efficiency when responding to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of a switching regulator. Output current modulation methods such as analog, PWM, Pulse Frequency Modulation, or other digital modulation, and combination or hybrid methods such as that disclosed in U.S. Pat. No. 7,088,059 B2 may be employed. The current invention marries such output modulation techniques with a control method which is derived through intelligent monitoring of the input voltage waveform. The circuit and method described is adapted to higher current applications such as LED lighting systems using the latest high-power LEDs. | 10-22-2009 |
20090322242 | Starting circuit of starting device for high-pressure discharge lamp including auxiliary light source, starting device including the starting circuit, and lighting system including the starting device - A starting circuit of a starting device for a high-pressure discharge lamp including an auxiliary light source has a diode placed in a forward direction in one of a pair of output lines which connect a main lighting circuit for generating AC voltage to the high-pressure discharge lamp and the auxiliary light source; a capacitor having one end connected to a cathode side of the diode; a boosting transformer including a primary winding, and a secondary winding having one end connected to an anode side of the diode or to the other output line and also having the other end connected to the other end of the capacitor; a high-frequency voltage generation circuit for continuously generating high-frequency voltage in combination with the primary winding; and a short-circuit switch for maintaining a short-circuit condition at both ends of the diode after the high-pressure discharge lamp is started. | 12-31-2009 |
20100117551 | Driver for backlight unit - A backlight unit, with a parallel configuration of plural lamps, having improved reliability is disclosed. The backlight unit driver includes: first and second lamps connected parallel to each other; a DC/AC inversion portion inverting a DC voltage into an AC voltage to apply the AC voltage to the lamps; a transformer transforming the AC voltage from the DC/AC inversion portion; a positive polarity AC signal compensator compensating an electric current difference between the first and second lamps using positive polarity AC signals from the first and second lamps; and a negative polarity AC signal compensator compensating the electric current difference between the first and second lamps using negative polarity AC signals from the first and second lamps. | 05-13-2010 |
20100213862 | LIGHT SOURCE DRIVING DEVICE - A light source driving device includes a power factor correction (PFC) circuit, a power stage circuit, a power conversion circuit, a balancing circuit, an inverter control signal processor, an inverter controller and an isolation component. Alternating current (AC) signals are converted into electrical signals to drive lamps via the PFC circuit, the power stage circuit, the power conversion circuit and the current balancing circuit. The power conversion circuit including a transformer divides the driving device into a primary side and a secondary side. The inverter control signal processor receives a first control signal output from a secondary side and generates a second control signal. The inverter controller is disposed on the secondary side to drive the power stage circuit. | 08-26-2010 |
20110163684 | DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND LIGHTING APPARATUS USING THE SAME - A driving circuit of light emitting diodes (LEDs) and a lighting apparatus using the same are provided in the application. The driving circuit includes a rectifier unit, an isolation element, a processing unit and a voltage converter circuit. The rectifier unit is coupled to a triac dimmer and outputs a first operation voltage. The processing unit detects a conducting condition of the triac dimmer according to a voltage waveform of the first operation voltage and outputs a pulse width modulation signal to drive the LEDs according to the detected conduction condition, so that flash problems of the LEDs caused by operation voltage variation are prevented. | 07-07-2011 |
20110163685 | Lamp End of Life (EOL) Detection Circuit - A lamp driver circuit to selectively energize one or more lamps is provided. The inverter circuit has a transformer with primary and secondary windings to provide voltage to the lamps. A filter is connected to the primary winding to receive a primary winding signal representative of the voltage across the primary winding. The primary winding signal has a frequency spectrum and the filter detects a particular characteristic of the frequency spectrum that is indicative of an end of life (EOL) condition of the one or more lamps. A control circuit is connected to the inverter circuit and to the filter. The control circuit is configured to discontinue energizing of the one or more lamps by the inverter circuit when the particular characteristic of the frequency spectrum of the primary winding signal is detected by the filter. | 07-07-2011 |
20110215731 | LED ILLUMINATION DRIVING APPARATUS - Provided is an LED illumination driving apparatus. When dimming is performed in the LED illumination apparatus, the power voltage level supplied to an LED module is selectively adjusted according to illuminance to prevent the flicker phenomenon occurring due to an excessive decrease in a duty ratio of a PWM control signal at a dimming time in the related art. More specifically, if the set illuminance is decreased by a user, the duty ratio of the PWM control signal is decreased, so that the illuminance of the LED illumination is decreased. When the duty ratio of the PWM control signal is decreased, if the user decreases the illuminance below a predetermined level corresponding to a threshold duty ratio where the flicker phenomenon occurs, the power voltage level transmitted to the LED module is decreased. The duty ratio is allowed to be increased again by the duty ratio corresponding to the decrease in the power voltage level, and after that, the duty ratio is allowed to be decreased again. Accordingly, it is possible to freely adjust the illuminance of the LED illumination apparatus while preventing the occurrence of the flicker phenomenon. | 09-08-2011 |
20110291582 | LIGHT EMITTING DIODE LIGHTING DEVICE DRIVEN BY A UNIFORM ALTERNATING CURRENT - The invention is disclosed a lighting device using an alternating current to drive light emitting diodes (LEDs). The lighting device uses at least two parallel-connected LED modules. In front of each LED module has connected to a current balancing unit in series that has same capacitance or inductance. The LED module comprises a first polarity LED bar and a second polarity LED bar connected in parallel. The LED module receives an alternating current voltage from the current balancing unit, which alternatively drive the first polarity LED bar and the second polarity LED bar. The light device uses different impedances of the current balancing unit and the LED to provide smooth and uniform current to the LED module and achieves a stable luminance. | 12-01-2011 |
20110298388 | LIGHT DRIVER CIRCUIT DEVICE AND BACKLIGHT DEVICE - A light driver circuit device for synchronously driving a plurality of cold cathode fluorescent lamps (CCFLs) is provided. The light driver circuit device includes an inverter circuit board and a balance circuit board. The inverter circuit board has an inverter circuit coupled to a driving signal for outputting a driving voltage to drive the CCFLs synchronously. The balance circuit board and the inverter circuit board are installed separately, and the balance circuit board has a balance circuit coupled to a terminal of each CCFL and the inverter circuit. The CCFL driving architecture is designed to install the inverter circuit and the balance circuit individually, thus effectively reducing the space of the driving circuit and the total cost of the circuit design. Furthermore, the balance circuit board can balance the current in each CCFL effectively, and there is no limitation to where the balance circuit board can be disposed. | 12-08-2011 |
20120062138 | APPARATUS AND METHOD FOR LED LIGHT CONTROL - An illumination apparatus comprises a plurality of LEDs and a control system connected to receive dimmer-modulated AC line voltage and control the LEDs. The control system is configured to operate in a plurality of different modes wherein changes in dimmer-modulated AC line voltage adjust various characteristic of the LEDs. | 03-15-2012 |
20120319614 | TRANSFORMER AND DISPLAY DEVICE USING THE SAME - There is provided a transformer having a minimized leakage inductance. The transformer includes: a winding part including a pipe shaped body part having a plurality of coils wound therearound and flange parts extended from both ends of the body part in an outer diameter direction thereof; and a core coupled to the winding part, wherein a flange part formed at one end of the body part includes at least one lead groove, and the coils are led to the outside of the winding part through the at least one lead groove. | 12-20-2012 |
20130009565 | ELECTRONIC BALLAST FOR PARALLEL LAMP OPERATION WITH PROGRAM START - An electronic ballast for parallel lamp operation with program start including an electronic ballast for fluorescent lamps operably connected in parallel, each of the fluorescent lamps having lamp filaments. The electronic ballast includes a current fed self oscillating inverter ( | 01-10-2013 |
20130221871 | MIXED LOAD CURRENT COMPENSATION FOR LED LIGHTING - In at least one embodiment, a system and method provide current compensation in a lighting system by controlling a lamp current to prevent a current through a triac-based dimmer from undershooting a holding current value. In at least one embodiment, at least one of the lamps includes a controller that controls circuitry in the lamp to draw more lamp current for a period of time than needed to illuminate a brightness of the lamp at a level corresponding to particular phase-cut angle of the supply voltage. By drawing more current than needed, the controller increases the dimmer current during the period of time to prevent the dimmer current from falling below the holding current value. In at least one embodiment, the period of time corresponds to a compensating pulse of the lamp current at a time when the dimmer current would otherwise fall below the holding current value. | 08-29-2013 |
20140354172 | Illumination systems - An illumination system includes a master power supply providing power to several illumination modules. The master power supply is constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current loop. Each illumination module includes an electromagnetic coupling element and several light sources. | 12-04-2014 |
20160157313 | CIRCUITRY FOR LED LIGHT DIMMER | 06-02-2016 |
315255000 | Plural transformers in the supply circuit | 14 |
20090108766 | CIRCUIT WITH IMPROVED EFFICIENCY AND CREST FACTOR FOR CURRENT FED BIPOLAR JUNCTION TRANSISTOR (BJT) BASED ELECTRONIC BALLAST - A current fed bipolar junction transistor (BJT) based inverter ballast includes base drive circuits configured to drive respective BJT switches, and high-speed drive reverse peak current limiting circuits, configured to operate in conjunction with the respective base drive circuits. | 04-30-2009 |
20090121647 | MULTI-LAMP BACKLIGHT APPARATUS - A multi-lamp backlight apparatus is disclosed. The multi-lamp backlight apparatus includes 2N lamps, N balancing transformers, and a high-voltage power source. N is a positive integer and k is an integer index ranging from 1 to N. The kth balancing transformer among the N balancing transformers includes a first primary winding, a second primary winding, and a secondary winding. The first primary winding connects in series with the (2k−1)th lamp of the 2N lamps. The second primary winding connects in series with the first primary winding and the (2k)th lamp. The secondary winding corresponds to the first primary winding and the second primary winding. The high-voltage power source is connected between the first primary windings and the second primary windings. | 05-14-2009 |
20090309508 | DRIVING CIRCUIT OF MULTI-LAMPS - A driving circuit of multi-lamps including a power supply module, a transformer module, a first detection module, and a control module is provided. Whether the power supply module is turned off is controlled by a control signal. The transformer module respectively provides a driving signal and an inverted driving signal to a first terminal and a second terminal of each lamp according to the AC signal. The first detection module detects a first indication signal combined by signals of the first terminal of one lamp and the second terminal of another lamp. The control module generates the control signal according to the first indication signal. Therefore, whether the lamps have a problem of a short circuit or an open circuit, or are in abnormal states can be known from the variations of the first indication signal, and a protection function for the driving circuit can be activated. | 12-17-2009 |
20100102744 | SYSTEM FOR DRIVING A PLURALITY OF LAMPS - A system for driving a plurality of lamps may monitor the faults of the lamps by detecting the voltage variance of the first, second and third detecting resistors connected to the low voltage ends of the first and second secondary winding for providing the power to the lamps. | 04-29-2010 |
20100181927 | MULTI-LAMP DRIVING CIRCUIT - A multi-lamp driving circuit includes a power supply, a booster converter including a first winding and a second winding, a plurality of current balance circuits and a plurality of balance converters. The first winding of the booster converter is coupled to the power supply. Each of the current balance circuits includes a plurality of current balance sub-circuits each including a capacitor and a lamp connected in series. One end of each of the current balance sub-circuits is connected to one end of the second winding of the booster converter. A first winding of each of the balance converters is electrically connected between the other end of the second winding of the booster converter and the other end of the current balance sub-circuits of corresponding current balance circuits. Second windings of the balance converters are connected in series. | 07-22-2010 |
20110050114 | FLUORESCENT LAMP WITH BALANCED LAMP TUBE ELECTRIC POTENTIALS - A fluorescent lamp includes three transformers, a power supply, a converter, and four lamp tubes. The converter converts a direct current (DC) provided by the power supply into an alternating current (AC) generated in a first transformer and a second transformer for driving the four lamp tubes to emit light. The third transformer is connected to the four lamp tubes to balance working electric potentials of the four lamp tubes. | 03-03-2011 |
20110062880 | BALANCE CIRCUIT AND INVERTER CIRCUIT COMPRISING THE SAME - The present invention provides a balance circuit including: a first balance trans having a primary coil and a secondary coil, the primary coil being connected to an output terminal of a first lamp, and the secondary coil being connected to an output terminal of a second lamp and having a current controlled by the primary coil; and a second balance trans having a primary coil and a secondary coil, the primary coil being connected to an output terminal of a third lamp, and the secondary coil being connected to an output terminal of a fourth lamp and having a current controlled by the primary coil connected to the output terminal of the third lamp, wherein the secondary coil of the first balance trans is connected to the primary coil of the second balance trans, and an inverter circuit including the same. | 03-17-2011 |
20120206060 | INDUCTIVE ELECTRONIC MODULE AND USE THEREOF - An inductive electronic module, comprising a core element having an inner limb ( | 08-16-2012 |
20120217893 | INVERTER DEVICE, ILLUMINATION DEVICE FOR DISPLAY DEVICE PROVIDED WITH THE SAME, AND DISPLAY DEVICE - Disclosed is an inverter device which is provided with a plurality of transformers and which drives a plurality of discharge tube lamps using the output voltage of the plurality of transformers as applied voltages that are respectively applied to the plurality of discharge tube lamps, wherein at least one axial direction of secondary windings of the plurality of transformers is set in a direction that is different from the other axial directions. | 08-30-2012 |
20120223653 | INVERTER DEVICE, DISPLAY APPARATUS LIGHTING DEVICE PROVIDED WITH SAME, AND DISPLAY APPARATUS - Disclosed is an inverter device which is provided with a plurality of transformers and is used for driving a plurality of discharge tube lamps (L | 09-06-2012 |
315256000 | Primaries in series | 4 |
20100237795 | MULTIPLE LAMP DRIVING DEVICE COMPRISING BALANCE TRANSFORMER - The present invention provides a multiple lamp driving capable of being applied to a multiple lamp system such as an LCD, wherein the multiple lamp driving device includes: a power supply unit for supplying a driving voltage to a lamp unit provided with first to 4nth lamps; and a balancing circuit unit including first to nth balance transformers for receiving the driving voltage from the power supply unit and balancing currents flowing through the first to 4nth lamps, wherein each of the first to nth balance transformers includes a primary side connected to the power supply unit in series and first and second secondary sides electrically connected to the primary side, each one end of the first and second secondary sides is connected to one end of one of the first to 4nth lamps, each of the other ends of the first and second secondary sides is connected to one end of another among the first to 4nth lamps, and the other ends of all of the first to 4nth lamps are connected to a ground. | 09-23-2010 |
20120001563 | ELECTRICAL SYSTEM USING HIGH FREQUENCY AC AND HAVING INDUCTIVELY CONNECTED LOADS, AND RELATED POWER SUPPLIES AND LUMINAIRES - Electrical systems comprising a power distribution system (Ia) for distributing high frequency AC power having s twisted pair conductor and power tapping element, for instance to an LED or OLED load. The electrical systems comprise an LED or OLED luminaire (Ic) having a heat sink and a light diffusing optical element and power supplies for powering LEDs or OLEDs such as those used in the luminaire (Ic). | 01-05-2012 |
20120256557 | MULTI-LAMP DRIVING SYSTEM - A multi-lamp driving system includes a power stage circuit, a pulse width modulation (PWM) controller, a plurality of transformer circuits, and an abnormal detection circuit. Each of the transformer circuits includes a first primary winding and a second primary winding connected in series and a first secondary winding and a second secondary winding respectively outputting AC power signals to drive at least one lamp. The abnormal detection circuit is connected to a junction of the first primary winding and the second primary winding of each of the transformer circuits, and determines if voltages of the junction of the first primary winding and the second primary winding of each of the transformer circuits are different to determine if the at least two lamps are normal. The abnormal detection circuit further generate control signals to control the PWM controller upon the condition that one of the at least two lamps are abnormal. | 10-11-2012 |
20140097766 | Load Control Device and Lighting Apparatus - A load control device includes saturable devices, loads, a phase controller, a bypass unit, and a controller. Plural saturable devices are connected in series to each other. Plural loads are respectively connected to the saturable devices and are supplied with power via the saturable devices. The phase controller phase-controls an output voltage of an AC power supply so as to be supplied to the respective loads. The bypass unit can supply a reduced bypass current so as to bypass the phase controller from a zero cross point of each half cycle of an AC power supply voltage. The controller sets an output of the phase controller and controls the output thereof to a set output value, and stops the supply of the bypass current in a condition in which a firing angle (conduction phase) is equal to or more than the predetermined value. | 04-10-2014 |
315257000 | With plural secondary or tapped secondary | 5 |
20080258645 | BACKLIGHT INVERTER AND LIQUID CRYSTAL DISPLAY USING THE SAME - A backlight inverter includes a transformer boosting an input voltage at a ratio of a primary winding to a secondary winding of the transformer and outputting a first voltage and a second voltage; a protection level signal generator causing a phase delay between the first voltage and the second voltage, and generating a protection level signal, the protection level signal being a sum of the phase reversed first voltage and the second voltage; and an arc state detector comparing the protection level signal with a reference voltage and generating a detection signal; and a diving controller maintaining or stopping a supplying of an input voltage to the transformer in response to the detection signal, wherein in addition to the phase delay, another phase delay is caused by an open circuit in the transformer, so that a maximum value of the protection level signal is larger than the reference voltage and the input voltage is stopped. | 10-23-2008 |
20090146577 | TRANSFORMER, ILLUMINATING APPARATUS USING THE SAME, AND DISPLAY APPARATUS USING THE SAME - A transformer arranged to be used for an illuminating apparatus includes a closed-magnetic-circuit core, a primary coil wounded around the closed-magnetic-circuit core, and plural secondary coils wounded around the closed-magnetic-circuit core. The plural secondary coils includ respective first ends and respective second ends. The illuminating apparatus includes plural discharge lamps. Each of the respective first ends and each of the respective second ends are arranged to be connected to discharge lamps, out of the plurality of discharge lamps, different from each other. This transformer prevents variation of lighting timings of discharge lamps, accordingly providing an illuminating apparatus and a display apparatus having little brightness variation. | 06-11-2009 |
20090153068 | BACKLIGHT ASSEMBLY, DISPLAY APPARATUS HAVING THE BACKLIGHT ASSEMBLY, AND METHOD THEREOF - A backlight assembly includes a light-generating unit and an inverter. The light-generating unit includes a first U-shaped lamp and a second U-shaped lamp parallel with each other. Electrodes of the first and second U-shaped lamps are disposed at one side of the light-generating unit. The inverter includes a multi-output transformer, a first output terminal and a second output terminal. The multi-output transformer generates a first driving voltage and a second driving voltage having a phase opposite to a phase of the first driving voltage. The first and second output terminals electrically connect the first and second U-shaped lamps with the multi-output transformer. The multi-output transformer applies the first and second driving voltages to the first and second U-shaped lamps via the first and second output terminals. | 06-18-2009 |
20090160350 | BALANCE TRANSFORMER AND BACKLIGHT APPARATUS - The invention provides a balance transformer and a backlight apparatus using the same. The balance transformer comprises a first main coil, a second main coil, a first induction coil, and a conductor. The first main coil has a first contact point and a second contact point, and the second main coil has a third contact point and a fourth contact point. The first induction coil is corresponding to the first main coil and the second main coil. The conductor is then series connected to the first contact point and the fourth contact point. Accordingly, the balance transformer drives the backlight apparatus to light and balances the currents of a plurality of light units of the backlight apparatus. | 06-25-2009 |
20100109547 | LCD BACKLIGHT INVERTER - Disclosed is a liquid crystal display (LCD) backlight inverter. The LCD backlight inverter includes a lamp open detection unit outputting a first open detection voltage for a preset time period when it is determined that a predetermined lamp is open, based on a current voltage corresponding to the current of the predetermined lamp of a plurality of lamps, a first open determination unit outputting an open detection signal when the first open detection voltage is input, a second open determination unit outputting a protection signal when it is determined that all of the plurality of lamps are open based on detection voltages of the plurality of lamps, a temporary protection determination unit outputting a frequency change signal when both the open detection signal and the protection signal are input, and an operating frequency control unit changing an operating frequency to a preset protective frequency according to the frequency change. | 05-06-2010 |