Class / Patent application number | Description | Number of patent applications / Date published |
315309000 | Thermal responsive regulator | 78 |
20080224637 | Night Light - A night-light ( | 09-18-2008 |
20080246419 | Led Luminary System - The present invention relates to a light emitting diode (LED) luminary system ( | 10-09-2008 |
20080284357 | BALLAST CONTROL IC WITH MINIMAL INTERNAL AND EXTERNAL COMPONENTS - A ballast controller integrated circuit which executes a specific set of instructions via an integrated state diagram architecture to control a fluorescent lamp or high intensity discharge lamp and protect the ballast. The state diagram architecture controls powering up and down of the IC and the half-bridge circuit driven by the IC, preheating and striking of the lamp, running of the lamp, sensing for numerous possible fault conditions, and recovering from these fault conditions based on the normal maintenance of a lamp, while requiring fewer internal and external components than previous electronic ballasts. | 11-20-2008 |
20080309258 | DRIVING METHOD AND CONTROL METHOD OF HOT CATHODE FLUORESCENT LAMP, AND ESTIMATION METHOD OF TEMPERATURE OF FILAMENT IN HOT CATHODE FLUORESCENT LAMP - An estimation method of the temperature of the filaments in the hot cathode fluorescent lamp (HCFL) is cooperated with a driving circuit, which drives a filament so that the filament has a filament voltage and a filament current. The estimation method includes the steps of measuring the filament voltage and/or the filament current calculating an equivalent resistance of the filament in accordance with the filament voltage and the filament current, and estimating the temperature of the filament in accordance with the equivalent resistance. A control method and a driving method of the HCFL are also disclosed. | 12-18-2008 |
20080315797 | METHOD AND FIRMWARE FOR CONTROLLING AN INVERTER VOLTAGE BY DRIVE SIGNAL FREQUENCY - A method and firmware for controlling an inverter voltage includes steps of receiving as input a digitized feedback signal representative of an inverter voltage that varies with frequency according to a transfer function, calculating a frequency of a digital switch control signal in firmware in an inverter voltage microcontroller by the transfer function from the digitized feedback signal to adjust the inverter voltage to a set point value, and generating the digital switch control signal having the calculated frequency by firmware in the inverter voltage microcontroller as output to generate the inverter voltage at the set point value. | 12-25-2008 |
20090033248 | Thermal Foldback For A Lamp Control Device - The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while continuing to operate it. | 02-05-2009 |
20090085503 | On-vehicle LED illumination device - An LED illumination device | 04-02-2009 |
20090189549 | Heat Dissipation in a Lighting System and Method Thereof - A lighting system is provided that includes at least one lighting device, at least one connector, and a plurality of external power sources. The at least one lighting device includes at least one lighting source, and an internal power source applying a first electrical current to illuminate the at least one lighting element, wherein the internal power source supplies the first electrical current. The at least one connector electrically connects to the at least one lighting device. The plurality of external power sources include at least first and second external power sources that are adapted to be electrically connected to the at least one lighting device by the at least one connector. The first external power source supplies a second electrical current to the at least one lighting device to illuminate the at least one lighting source and the second external power source supplies a third electrical current to illuminate the at least one lighting source, such that the internal power source and one of the plurality of external power sources each supply electrical current to illuminate the at least one lighting source at different times. | 07-30-2009 |
20090200966 | ILLUMINATION UNIT WITH CURRENT INTERRUPTER COMPONENT - An illumination unit comprises at least one electrical coupling element for receiving electrical current from a current source and coupling the illumination unit into an electrical system, a light-carrying member, and an electrical circuit adapted for electrical coupling to the current source via the electrical coupling element. The electrical circuit comprises at least one light-emitting diode carried by the light-carrying member, and a current interrupter component interposed in the electrical circuit. The current interrupter component permits current flow within the electrical circuit when a parameter of the electrical circuit remains below a predetermined value, and opens the electrical circuit in response to the parameter of the electrical circuit exceeding the predetermined value. The current interrupter component may be carried by the light-carrying member, or may be contained within an exterior envelope at least partially surrounding the electrical circuit. | 08-13-2009 |
20090230892 | SAFETY LOOP FOR A LIGHT FIXTURE - A light fixture and a method for control of a light fixture is supervised by at least one thermoswitch which protects the light source by disconnecting the power supply to the light source at elevated temperature. To achieve a safety circuit in a light fixture without switching the supply circuit to a light source, the at least one thermoswitch is connected to a low voltage safety loop, which safety loop is connected to a current source that generates a constant current in the safety loop. The safety loop is supervised by a current measuring device. Hereby, it is achieved that the switching, if temperature rises, is achieved by switching contacts that only carry a very limited current. This will increase the life time of the thermoswitch and very small switches can be used. | 09-17-2009 |
20090251076 | HID ballast with integrated voltage multiplier and lamp temperature compensation - The present invention relates to temperature compensation of HID lamps in automobiles. The invention concerns the manner in which the temperature of the HID lamp is accounted for in order to drive the lamp is at appropriate power from hot to cold conditions. In the present invention, the voltage across a capacitor in the temperature compensation circuit is sensed and used as a command signal to anticipate lamp temperature, and accordingly the reference power to the HID lamp is modulated depending on the temperature of the lamp. In the present invention, the lamp is driven with a higher power setting when the lamp is cold and with lower power setting when hot. This adaptive generation of reference power setting depending on the temperature of the lamp is implemented using the voltage across a capacitor in the temperature compensation circuit. | 10-08-2009 |
20090273305 | CONTROL SYSTEM FOR FLUORESCENT LIGHT FIXTURE - A ballast module regulates power output to a fluorescent light. The ballast module includes a component. A temperature sensor senses temperature of the component. A control module adjusts power output to the fluorescent light based on the temperature of the component sensed by the temperature sensor. The control module adjusts power to the fluorescent light by reducing the power output to the fluorescent light or increasing the power output to the fluorescent light. | 11-05-2009 |
20090284183 | CFL Auto Shutoff for Improper Use Condition - An auto shutoff mechanism that automatically turns off power to a compact fluorescent lamp (CFL) in the presence of an improper use, or an excessive temperature condition, is disclosed. The auto shutoff includes a temperature transducer, a temperature monitoring circuit, or a microprocessor with memory, and a supporting control circuit. The temperature monitoring circuit, or a predetermined algorithm stored in memory, monitors the ambient temperature for an excessive temperature condition. Upon detection of an excessive temperature condition, the temperature monitoring circuit instructs the control circuit to turn off power to the CFL. Once the detected temperature falls below a predetermined level, power is restored to the CFL. | 11-19-2009 |
20090309517 | Temperature dependent current control circuit for LED lighting - An improved LED current control circuit includes a temperature sensor responsive to the ambient temperature for producing a temperature dependent voltage V | 12-17-2009 |
20090309518 | APPARATUS AND METHOD FOR MONITORING AT LEAST ONE FLUORESCENT LAMP - An apparatus for monitoring at least one fluorescent lamp, in particular in an explosion-hazard area, which fluorescent lamp has a lamp tube with electrodes arranged at its ends in the form of filaments, and has a ballast, is improved in order to avoid an excessive temperature increase while maintaining the appropriate explosion protection in that the monitoring apparatus has at least one temperature measurement device, associated with a filament, and an electronic interruption device, by means of which interruption device the power supply can be interrupted by means of the ballast on reaching a predetermined critical temperature. The invention likewise relates to a corresponding method for monitoring at least one fluorescent lamp, in particular in an explosion-hazard area. In this method, the temperature is first of all detected in the area of at least one filament of the fluorescent lamp. The determined temperature is then compared with a predetermined critical temperature, and the power supply to the filament is interrupted by a ballast if the determined temperature reaches or exceeds the predetermined critical temperature. | 12-17-2009 |
20100013416 | PLASMA DISPLAY DEVICE - A plasma display device includes a plasma display panel, a chassis disposed on the plasma display panel with a heat-conducting sheet in between, a small-signal processing circuit board disposed on a rear face of the chassis, a thermal sensor, a thermal sensor fixture for installing the thermal sensor, a front frame, and a back cover having a ventilation area with multiple ventilating holes. The thermal sensor fixture has a shielding wall around the thermal sensor and is disposed on a rear face of the small-signal processing circuit board. The thermal sensor is disposed at an intermediate position between the plasma display panel and the back cover at a position facing the back cover. | 01-21-2010 |
20100033113 | LED DRIVE CIRCUIT - An LED drive circuit that drives an LED is provided with: a rectifying circuit that converts an alternating voltage into a pulsating current; a constant current circuit; and an over-temperature protection portion that limits an output of the constant current circuit, wherein the LED and the constant current circuit are connected in series on an output side of the rectifying circuit. | 02-11-2010 |
20100039049 | Positive Temperature Coefficient Light Emitting Diode Light - An apparatus includes a light source, a substrate, a temperature-based controller and an insulator. The light source is mounted to the substrate. The temperature-based controller is electrically coupled to the light source and causes the light source to provide a relatively constant light output. The insulator is positioned proximate the temperature based controller. | 02-18-2010 |
20100045211 | BRIGHTNESS ADJUSTING DEVICE AND BRIGHTNESS ADJUSTING METHOD - A brightness adjusting device has: a warm-up time determining unit which calculates a temperature difference between the outside temperature detected by an outside temperature detecting unit and the inside temperature detected by an inside temperature detecting unit and reading and determining a warm-up time corresponding to the calculated temperature difference, as an estimated warm-up time, from a product inside temperature table stored in a product inside temperature table storing unit; a target brightness value determining unit which reads and determines a target brightness value, which corresponds to the estimated warm-up time read and determined by a warm-up time estimating unit, from a target brightness value table stored in a target brightness value table storing unit; and a brightness value setting unit which sets a brightness value of the display device according to the target brightness value read and determined by the target brightness value calculating unit. | 02-25-2010 |
20100066270 | Control method for maintaining the luminous intensity of a light-emitting diode light source - The present invention provides a control method for maintaining the luminous intensity of an LED (Light-Emitting Diode) light source. The control method includes the steps of: providing a driving current source to drive the LED light source, monitoring and obtaining a first parameter of the LED light source, and comparing the first parameter with a second parameter. By monitoring the first parameter of the LED light source and combining the feedback mechanism, a driving current of the driving current source can be adjusted in real time to make the first parameter tend toward the second parameter. Thus, the luminous intensity of the LED light source can be maintained and will not be changed with the variation of the operating environment. | 03-18-2010 |
20100066271 | LED DRIVE CIRCUIT - An LED drive circuit that sufficiently exhibits the performance of an LED element to obtain a favorable luminance at room temperature, includes a constant-current circuit including an LED element, a constant-current output unit, and a temperature sensing element having a negative resistance-temperature coefficient. The LED element is connected to the constant-current output unit in series. The constant-current output unit is connected to the LED element in parallel. Due to changes in the resistance value of the constant-current output unit caused by changes in temperature, the value of a current passing through the LED element is increased at room temperature and the value of a current passing through the temperature sensing element is reduced at high temperature. | 03-18-2010 |
20100148701 | LED CONTROL CIRCUIT - A LED control circuit includes an LED array circuit and a control circuit. The LED array circuit has a plurality of parallel branches, each of which has a constant-current regulator, an LED and an FET connected together in series, wherein the constant-current regulator supplies a steady current to the corresponding LED and the FET can control the respective LED to be put out or lighted up. The control circuit includes a microprocessor and a temperature sensor. The temperature sensor is connected with the microprocessor and located near the LEDs of the LED array circuit for detecting the temperature of the LEDs and transmitting the temperature signals to the microprocessor. The microprocessor is connected with the FETs of the LED array circuit for controlling the corresponding FETs to be repeatedly on or off according to the temperature signals in order to regulate the temperature of the corresponding LEDs respectively. | 06-17-2010 |
20100148702 | LIQUID CRYSTAL DISPLAY AND OVERHEAT PROTECTION METHOD THEREOF - A liquid crystal display equipped with an overheat protection device and overheat protection method is disclosed. When a temperature sensor measures that the temperature of a LED (Light-Emitting Diode) backlight module is overheated and possibly will cause damage, the overheat protection device descend the luminance of the LED backlight module to lower the temperature inside the liquid crystal display. | 06-17-2010 |
20100181937 | OPTICAL TRANSMITTER - An optical transmitter that can perform high-speed ON/OFF control of bias light that is input to an optical modulator. A high-speed current switching circuit performs a high-speed ON/OFF control of a drive current of an LD according to an LD ON/OFF signal. Thus, high-speed ON/OFF control of an optical output from the LD can be performed. A temperature detecting current generation circuit detects the ambient temperature, and generates the drive current adjusted according to the ambient temperature detected thereby so that the optical output from the LD is not affected by the ambient temperature. | 07-22-2010 |
20100219774 | METHOD FOR DIMMING LIGHT SOURCES, RELATED DEVICE AND COMPUTER PROGRAM PRODUCT - A method of compensating the degradation of the luminous intensity due to aging in a light source by controlling a power supply signal of said light source. The method may include: detecting the temperature of said light source; determining a parameter representative of the aging of said light source as a function of said temperature; and varying said power supply signal as a function of said parameter representative of the aging of the light source. | 09-02-2010 |
20100237805 | Lighting Device - To provide a lighting device in which the luminance of an EL element is maintained even when the EL element deteriorates so that degradation of the lighting device is reduced, the lighting device includes a surface light source portion including an organic EL element, and a control circuit portion provided in a base portion. The control circuit portion counts a lighting time of the organic EL element and controls the luminance of the organic EL element in accordance with the lighting time. Accordingly, the lighting device in which the luminance of an EL element is maintained regardless of degradation of the EL element so that degradation of the lighting device is reduced can be provided. | 09-23-2010 |
20100259196 | Low Current Thyristor-Based Dimming - Various apparatuses and methods for starting a thyristor are disclosed herein. For example, some embodiments provide an apparatus for controlling power to a load. The apparatus includes a thyristor, a secondary load switchably connected to an output of the thyristor, and a sensor connected to the secondary load. The sensor is adapted to connect the secondary load to the thyristor when the output of the thyristor falls below a predetermined level. | 10-14-2010 |
20100264849 | LIGHT MODULE FOR SIGNALING - A light module for signaling comprising an assembly module ( | 10-21-2010 |
20100270951 | Fluorescent lamp Having Overheat Protection Function - A fluorescent lamp includes a base, a control circuit mounted in the base, a fluorescent tube electrically connected with the control circuit, and a protection device electrically connected with the control circuit. Thus, when the temperature of the control circuit is raised excessively to reach a preset temperature value due to an overheat of the fluorescent tube, the protection device is operated to shut an electric power supplied to the control circuit so as to stop operation of the fluorescent tube and to prevent the control circuit from producing overheat, thereby protecting and preventing the control circuit from being worn out or broken due to an overheat. | 10-28-2010 |
20100289432 | Light emitting apparatus and control method thereof - A light emitting apparatus and a control method thereof are provided. The light emitting apparatus has a semiconductor device capable of emitting light, and the control method includes the following descriptions. A driving power of the semiconductor device is reduced to an ideal power stepwise and gradually. After every time the driving power of the semiconductor device is reduced, the semiconductor device continually emits the light by the reduced driving power within a predetermined time. | 11-18-2010 |
20100320939 | LIGHT EMITTING DIODE ILLUMINATING SYSTEM AND CONTROLLING METHOD THEREOF - A light emitting diode (LED) illuminating system includes an LED lamp, a sensor, a memory, a controller, an AC/DC convertor, a DC/DC convertor and a current detector. The sensor detects a temperature around the LED illuminating system. The memory stores the detected temperature and a comparison table. The controller finds an optimized working voltage in the comparison table, according to the detected temperature. The AC/DC converter outputs a DC power with the optimized working voltage. The DC/DC converter converts the DC power into another DC power and supplies the another DC power to the LED lamp. The current detector detects a current variation of the another DC power. The controller stabilizes a current of the another DC power output by the DC/DC converter to the LED lamp, according to the current variation. | 12-23-2010 |
20100327777 | CLAMP TO ENABLE LOW VOLTAGE SWITCHING FOR HIGH VOLTAGE TERMINAL APPLICATIONS - An output stage for an LED driver is provided. In particular, a low voltage clamp, which uses several cascode circuits, is provided to protect low voltage switching transistors in the range of two times higher voltage application under both normal and fault conditions. Additionally, a circuit for regulating the bias voltage applied to each of the cascode circuits is provided to prevent damage during startup, while an internal voltage regulator is settling. | 12-30-2010 |
20100327778 | TRANSITION-RATE CONTROL FOR PHASE-CONTROLLED AC POWER DELIVERY SYSTEM - A phase-controlled power delivery system for a load such as an incandescent lamp controls the rate of transition of an AC power waveform as a function of switch temperature or other heat-related parameter to provide for time-varying optimization of a tradeoff between heat and noise. | 12-30-2010 |
20110031903 | SYSTEM AND METHOD FOR ESTIMATING THE JUNCTION TEMPERATURE OF A LIGHT EMITTING DIODE - A method of estimating the junction temperature of a light emitting diode comprises driving a forward bias current through the diode, the current comprising a square wave which toggles between high and low current values (I | 02-10-2011 |
20110043141 | CIRCUIT FOR PREVENTING SELF-HEATING OF METAL-INSULATOR-TRANSITION (MIT) DEVICE AND METHOD OF FABRICATING INTEGRATED-DEVICE FOR THE SAME CIRCUIT - Provided are a MIT device self-heating preventive-circuit that can solve a self-heating problem of a MIT device and a method of manufacturing a MIT device self-heating preventive-circuit integrated device. The MIT device self-heating preventive-circuit includes a MIT device that generates an abrupt MIT at a temperature equal to or greater than a critical temperature and is connected to a current driving device to control the flow of current in the current driving device, a transistor that is connected to the MIT device to control the self-heating of the MIT device after generating the MIT in the MIT device, and a resistor connected to the MIT device and the transistor. | 02-24-2011 |
20110062895 | Circuit for driving an infrared transmitter LED with temperature compensation - Systems and methods to achieve a circuit for driving one or more infrared transmitter LEDs with temperature compensation have been disclosed. In a preferred embodiment of the invention the circuit has been applied for a rain sensing system. The junction temperature of the LED is measured and compensated by adjusting the driver current of a voltage-to-current converter driving the LED. The LED junction temperature is measured by comparing the difference in the forward diode voltage at different current densities. This voltage difference is extracted when switching the drive currents between different constant values. The measurement results are converted to digital values, which are used by a buffered dual ladder resistive DAC structure to adjust the drive current to temperature variations. | 03-17-2011 |
20110068715 | LED Light Sources with Improved Thermal Compensation - A compound light source that compensates for changes in electrical conversion efficiency with increasing operating temperature is disclosed. The compound light source generates light of a design intensity at a design temperature in response to a drive current flowing through the light source. The light source includes a primary light source and a compensating light source. The primary and compensating light sources convert an electrical current passing therethrough to light, each light source being characterized by an electrical conversion efficiency that decreases with increasing temperature and that also decreases with increasing current. The compound light source includes a temperature sensor that measures the temperature of the primary light source and a current splitting circuit that divides the drive current between the primary and compensating light sources to compensate for the decrease in efficiency of the primary light source with temperature above the design temperature. | 03-24-2011 |
20110095707 | Power Limiting Method and Apparatus - Alternating electric current flow through a lamp fixture (L) of a maximum power rating is reduced without being terminated should a lamp be used in the fixture of a power rating that exceeds the fixture's maximum power rating. This is done using a thermally responsive switch (B) connected in series with a resistor (S) of relatively low resistance and in parallel with a resistor (P) of relatively high resistance, the switch and resistors being thermally connected, and by simultaneously passing alternating current to the fixture through an auxiliary line which has a diode (D | 04-28-2011 |
20110121760 | LED THERMAL MANAGEMENT - A thermal-management circuit detects a temperature of the LED, obtains a thermal operating range of the LED, and generates a control signal in response. | 05-26-2011 |
20110163696 | THERMAL FOLDBACK CONTROL FOR A LIGHT-EMITTING DIODE - By monitoring the temperature of an LED and the temperature of a controller chip for the LED, a thermal foldback control is employed to gradually decrease the driving current of the LED before the LED or the controller chip is over heated, so as to prevent an over temperature protection from being triggered to shutdown the controller chip to cause the LED to undesirably flicker. | 07-07-2011 |
20110266978 | LIGHT OUTPUT CONTROL TECHNIQUE BY ESTIMATING LAMP EFFICACY AS A FUNCTION OF TEMPERATURE AND POWER - Techniques are disclosed for controlling the light output of a lamp, where lamp efficacy is estimated as a function of estimated lamp temperature and instantaneous input power, or as a function of estimated lamp temperature only. Whether efficacy is estimated as a function of temperature and power, or as a function of temperature only can depend on changes in the lamp operating scenario. The techniques estimate lamp temperature by tracking energy input to and losses from (losses such as radiation, conduction, emission) the lamp arc tube, and determine the corresponding instantaneous light producing ability. The techniques may further be implemented to deliver the appropriate power command to obtain a desired light output. The techniques can be applied towards a general control in which arbitrary or custom light output vs. time paths are produced, and may be implemented by a processor programmed or otherwise configured to execute the desired control scheme. | 11-03-2011 |
20110285324 | CURRENT REGULATING CIRCUIT AND LIGHT EMITTING DIODE DEVICE HAVING THE SAME - A current regulating circuit is for connection in series between a light emitting diode (LED) and a power source, and includes: a first resistive unit having a first resistance that is proportional to an operation temperature of the LED when the operation temperature is above a predetermined threshold temperature; and a second resistive unit connected in series with said first resistive unit, and having a second resistance that is inversely proportional to the operation temperature of the LED when the operation temperature is above the predetermined threshold temperature. When the operation temperature of the LED is above the predetermined threshold temperature, an effective resistance of said current regulating circuit attributed to said first and second resistive units is proportional to the operation temperature of the LED, and absolute value of a rate of change of the first resistance is larger than that of the second resistance. | 11-24-2011 |
20110291594 | LAMP DEVICE AND LIGHTING FIXTURE - In a lamp device | 12-01-2011 |
20110304281 | THERMALLY-TUNED DEPTH CAMERA LIGHT SOURCE - Various embodiments are disclosed for setting a depth camera light source operating temperature in a thermal tuning mode executed during a depth camera manufacturing process. One embodiment of a method includes illuminating a target with light from a light source at a plurality of light source temperatures; for each light source temperature, sensing an intensity of reflected light received at a light sensor through a light filter positioned intermediate the target and the light sensor; approximating a frequency response relationship between a light filter cutoff frequency and a light source emission wavelength based on a comparison of the sensed intensities and stored reference data; generating a temperature set point so that the light source emission wavelength does not overlap the light filter cutoff frequency by more than a predetermined overlap threshold; and programming a temperature controller to control the light source to the temperature set point during depth camera operation. | 12-15-2011 |
20120062150 | Thermally Self-Stabilizing LED Module - An improved LED module that is thermally self-stabilizing, and that is able to be retrofitted into an existing flashlight is provided. In one embodiment, the LED module includes a light emitting diode, an amplifying circuit and a microchip. The amplifying circuit includes a temperature sensing device to sense heat from the light emitting diode. The output of the amplifying circuit is input to the microchip which output to a switching device that regulates energy that is delivered to the light emitting diode. The switching device may be part of a boosting circuit, a bucking circuit or an inverting circuit. | 03-15-2012 |
20120068627 | TEMPERATURE COMPENSATED LED CONSTANT CURRENT SOURCE - A device and method for providing a temperature compensated LED constant current source. A positive temperature coefficient (PTC) resistor is utilized to reduce the current being supplied through a driver circuit to an LED lighting element under varying environmental conditions. The PTC resistor prevents the LED elements from overheating due to excessive ambient temperature, improper thermal design or excessive voltage. A voltage regulator may be included to linearize the temperature vs. resistance characteristics of the PTC resistor. | 03-22-2012 |
20120074871 | Apparatus for controlling power supplied to discharge lamp in response to command supplied from outside the apparatus - There is provided a discharge lamp controlling apparatus mounted on vehicles or others. The apparatus includes a discharge lamp, a power control section, a signal inputting section, and a storage which are united with each other. The signal inputting section allows a power command signal to be inputted from the outside of the apparatus, the power command signal being for commanding the value of power supplied to the discharge lamp, and extracts from the inputted power command signal commanded power values which command the value of the power. The storage section stores therein, at least, the newest commanded power value among the extracted commanded power values. The power control section controls the power supplied to the discharge lamp based on the newest command values stored in the storage section. | 03-29-2012 |
20120086362 | ILLUMINATION DEVICE - An organic EL device as an illumination device includes a device substrate as a first substrate having a first surface and a second surface, and a conductor portion provided on the first surface of the device substrate and overlapping the periphery of a luminescent section or at least a part of a region where the luminescent section is provided, when seen in a plan view. The conductor portion includes a conductive material and detects the temperature of the luminescent section. | 04-12-2012 |
20120146551 | CONTROL SYSTEM FOR FLUORESCENT LIGHT FIXTURE - A circuit includes a component connected (i) to a rectifier, and (ii) between electrodes of a lamp. The electrodes include a first electrode and a second electrode. A control module is in communication with the rectifier and is configured to receive a temperature signal from a temperature sensor. The temperature signal is indicative of a temperature of the component. The control module is also configured to decrease current to the electrodes for a predetermined period when the temperature of the component is greater than a first predetermined temperature. The control module is further configured to increase the current to the electrodes when the predetermined period expires and independent of the temperature of the component. | 06-14-2012 |
20120268040 | THERMAL FOLDBACK SYSTEM - A thermal-foldback system detects an over-temperature condition in an LED lamp. In response to the over-temperature condition, the thermal-foldback system chops a portion of the input power waveform drawn by the LED lamp. | 10-25-2012 |
20120293093 | LIGHT EMITTING DEVICE AND SYSTEM PROVIDING WHITE LIGHT WITH VARIOUS COLOR TEMPERATURES - In a light emitting device and system providing white light with various color temperatures are provided, a light emitting device includes a light emitting element (LED) that is operated by a driving bias and emits first light, and a phosphor layer including a phosphor that partially wavelength-converts first light and emits second light, thereby emitting white light using the first light and the second light, wherein the phosphor has a maximum conversion efficiency at a first level of the driving bias, and the LED has a maximum conversion efficiency at a second level of the driving bias, the first level being different from the first level. | 11-22-2012 |
20120313551 | Lamp Device - According to one embodiment, a lamp device includes a housing including a cap, a light-emitting module arranged in the housing and a lighting circuit. The light-emitting module includes a module board, and a semiconductor light-emitting element mounted on the module board. The lighting circuit includes a circuit board, plural circuit components mounted on the circuit board, and a first thermosensor and a second thermosensor arranged at different positions on the circuit board where a temperature difference occurs at time of lighting. The lighting circuit controls lighting of the semiconductor light-emitting element according to the temperature difference between the first thermosensor and the second thermosensor. | 12-13-2012 |
20130033198 | BACKLIGHT UNIT AND METHOD FOR CONTROLLING LED - A backlight unit is provided, which includes a light-emitting diode LED, an LED driving unit which drives the LED, a control unit which measures a temperature of the LED driving unit, and, if the temperature exceeds a preset threshold temperature, interrupts an operation of the LED driving unit, and a threshold temperature adjustment unit which changes the preset threshold temperature based on a limit temperature of a circuit element included in the LED driving unit. | 02-07-2013 |
20130076267 | LIGHT EMITTING SYSTEM WITH LIGHT EMITTING POWER STABILIZATION - A light emitting system includes: a voltage detecting unit connected across a solid-state light emitting component for detecting a forward voltage thereof and generating a detection voltage having a magnitude dependent on the forward voltage; a current control unit connected to the light emitting component for controlling, according to a compensation voltage, flow of an operating current, which has a magnitude dependent on the compensation voltage, therethrough; and a compensation voltage module connected to the voltage detecting unit and the current control unit, disposed to receive a reference voltage, and configured to generate the compensation voltage, which varies according to the forward voltage, for provision to the current control unit according to the detection voltage, an operating voltage having a magnitude dependent on the operating current, and the reference voltage. | 03-28-2013 |
20130154518 | SYSTEMS AND METHODS FOR DATA COMMUNICATION FROM AN LED DEVICE TO THE DRIVER SYSTEM - One or more operating conditions of an LED device is sensed, and the sensed condition is communicated to an LED driver by modulating a load thereof. | 06-20-2013 |
20130175950 | ELECTRONIC BALLAST WITH POWER THERMAL CUTBACK - An electronic ballast with power thermal cutback including an electronic ballast operably connected to provide power to a lamp, the electronic ballast having a PFC converter (HO) operable to receive a PFC input voltage ( | 07-11-2013 |
20130187571 | LED THERMAL PROTECTION STRUCTURES - The present disclosure discloses an apparatus for thermally protecting an LED device. The apparatus includes a substrate. A light-emitting device disposed on a first region of the substrate. The apparatus includes a thermistor disposed on a second region of the substrate. The second region is substantially spaced apart from the first region. The thermistor is thermally and electrically coupled to the light-emitting device. The present disclosure also discloses a method of thermally protecting an LED device. The method includes providing a substrate having a light-emitting diode (LED) die disposed thereon. The method includes detecting a temperature of the LED die using a negative temperature coefficient (NTC) thermistor. The NTC thermistor is positioned on a region of the substrate substantially away from the LED die. The method includes adjusting an electrical current of the LED die in response to the detecting. | 07-25-2013 |
20130214703 | MULTIPLEXER CIRCUIT FOR DUAL THERMISTOR OPERATION USING A SINGLE LINE COUPLING - A time-multiplexed thermal sensing circuit is provided for control and sensing of two thermistors over a single line electrical coupling. The circuit may include a first diode that selectively couples or isolates a first thermistor from a sense node based on the polarity of an applied voltage to the sense node. The circuit may further include a second diode that selectively couples or isolates a second thermistor from the sense node based on the polarity of the applied voltage to the sense node such that only of the thermistors is coupled to the sense node at any time. | 08-22-2013 |
20130249440 | Circuit And Method For Driving A Light-Emitting Diode - Circuits and methods for driving an LED from a secondary side of a transformer are disclosed herein. An embodiment of the method includes monitoring an input voltage to determine the power level intended to drive the LED. The current flow through the primary side of the transformer is adjusted to make the power actually driving the LED equal to the power intended to drive the LED. | 09-26-2013 |
20130271042 | LIGHT EMITTING DEVICE AND SYSTEM PROVIDING WHITE LIGHT WITH VARIOUS COLOR TEMPERATURES - In a light emitting device and system providing white light with various color temperatures are provided, a light emitting device includes a light emitting element (LED) that is operated by a driving bias and emits first light, and a phosphor layer including a phosphor that partially wavelength-converts first light and emits second light, thereby emitting white light using the first light and the second light, wherein the phosphor has a maximum conversion efficiency at a first level of the driving bias, and the LED has a maximum conversion efficiency at a second level of the driving bias, the first level being different from the first level. | 10-17-2013 |
20140015446 | METHOD AND APPARATUS FOR CURRENT DERATING WITH INTEGRATED TEMPERATURE SENSING - A method and apparatus for derating current and for derating current for a camera flash. The method comprises monitoring a local junction temperature of a module. The local junction temperature is converted into a local junction current. The local junction current is then compared with a reference current, which is independent of temperature. After the current comparison and subtraction is made, a derate control current is obtained to generate the LED reference current. After the temperature crosses the temperature threshold, the derate control current is derated. Both the temperature threshold and current derate slope are programmable and precisely controlled. The LED output current is regulated and proportional to the LED reference current. If the local junction temperature is greater than the temperature threshold, the LED output current is derated at the moment of the camera flash to avoid thermal overload. | 01-16-2014 |
20140015447 | THERMAL DE-RATING POWER SUPPLY FOR LED LOADS - Embodiments disclosed herein describe the use of a power supply to provide power to an LED load. The power supply provides a present output current to the LED, and receives a temperature signal representing the operating temperature of the LED. A target output current is determined, for instance based on the temperature signal. An output current rate of change is determined, and the power supply adjusts the output current to the LED at the determined rate of change until the output current is substantially equal to the target current. | 01-16-2014 |
20140176020 | PROTECTION CIRCUIT FOR BACKLIGHT DRIVER CIRCUIT, BACKLIGHT MODULE, AND LCD DEVICE - A protection circuit of a backlight driver circuit includes a backlight driver circuit. The backlight driver circuit includes a backlight driver integrated circuit (IC), and the backlight driver IC includes a protection pin that controls the backlight driver IC to enter a protection mode. The backlight driver circuit further includes a protection circuit, and the protection circuit includes a monitoring unit that monitors a temperature of the backlight driver circuit. When the temperature of the backlight driver circuit exceeds a preset temperature, the monitoring unit sends the protection signal to the protection pin to control the backlight driver IC to enter the protection mode. | 06-26-2014 |
20140210378 | LAMP - A lamp powered by batteries | 07-31-2014 |
20140217926 | LIGHT EMITTING DIODE REPLACEMENT LAMP - Thermal management and control techniques for light emitting diode and other incandescent replacement light technologies using a current controller are disclosed. | 08-07-2014 |
20140252993 | LIGHTING CONTROL DEVICE - A lighting control device controls a turn-on state and a turn-off state of a lighting apparatus in a room where an air-conditioning apparatus is provided. In the lighting control device, a temperature sensing section is provided in the air-conditioning apparatus and senses temperature of the room to allow the air-conditioning apparatus to perform air-conditioning control such that the sensed temperature of the room lies within a preset temperature range. A temperature acquisition section acquires the sensed temperature. A determination section determines that a switching condition for switching the lighting apparatus has been met, when the acquired sensed temperature coincides, within a preset tolerance range, with a criterion temperature which is set separately from the preset temperature range on the basis of a body temperature of a person. A switching section switches the lighting apparatus between the turn-on state and the turn-off state, when determined that the switching condition has been met. | 09-11-2014 |
20140354185 | DISPLAY DEVICE, COMPUTER PROGRAM, RECODING MEDIUM, AND TEMPERATURE ESTIMATION METHOD - There are provided a display device which can accurately estimate an ambient temperature around the display device, a computer program, a recording medium, and a method for estimating an ambient temperature. A panel temperature sensor and a switch board temperature sensor are disposed in different positions of a display device. A control unit specifies correlation information indicating the correlation between a first temperature difference between a temperature detected by the panel temperature sensor and an ambient temperature and a second temperature difference between a temperature detected by the switch board temperature sensor and the ambient temperature. The control unit estimates the ambient temperature on the basis of the specified correlation information and the temperatures and detected by the panel temperature sensor and the switch board temperature sensor. | 12-04-2014 |
20140368130 | SYSTEMS AND METHODS FOR PROVIDING THERMAL FOLD-BACK TO LED LIGHTS - In various embodiments, a module for providing thermal fold-back protection to an illumination device includes a housing, at least one temperature sensor, and thermal fold-back circuitry. | 12-18-2014 |
20150084546 | Dimming Control System - According to one embodiment, a dimming control system includes a luminaire and a host equipment. The luminaire receives dimming data transmitted using data frames based on a specified communication protocol, and performs dimming control of a lighting load. The host equipment uses the data frames to transmit the dimming data, and uses a part of the data frames to transmit a command to request luminaire information of the luminaire. | 03-26-2015 |
20150097497 | LIGHT EMITTING DEVICE, ELECTRONIC APPARATUS, AND DESIGN METHOD OF SEMICONDUCTOR DEVICE - A light emitting device including a drive transistor that generates a drive current IDR of a current amount corresponding to a gate-source voltage IDR, a light emitting element that emits light at a luminance corresponding to the current amount of the drive current, and a control unit that controls the gate-source voltage according to a specified gradation is configured as follows. The gate-source voltage varies within a range between a first voltage value or more and a second voltage value or less. A third voltage value which is a gate-source voltage when a change rate of the drive current with respect to an environmental temperature change is a predetermined value or less is a voltage value out of the range. The first voltage value is a value of the third voltage value or more, and the second voltage value is a value of the third voltage value or less. | 04-09-2015 |
20150115843 | LIGHT EMITTING DEVICE AND SYSTEM PROVIDING WHITE LIGHT WITH VARIOUS COLOR TEMPERATURES - In a light emitting device and system providing white light with various color temperatures are provided, a light emitting device includes a light emitting element (LED) that is operated by a driving bias and emits first light, and a phosphor layer including a phosphor that partially wavelength-converts first light and emits second light, thereby emitting white light using the first light and the second light, wherein the phosphor has a maximum conversion efficiency at a first level of the driving bias, and the LED has a maximum conversion efficiency at a second level of the driving bias, the first level being different from the first level. | 04-30-2015 |
20150373805 | LIGHT DRIVER AND THE CONTROLLER AND DRIVING METHOD THEREOF - A light driver and the controller and the driving method thereof are disclosed. The controller has a reference generating circuit which has a dimming signal converting circuit, a thermal signal converting circuit and a selecting circuit. The dimming signal converting circuit converts a dimming signal into a converted dimming signal and the thermal signal converting circuit converts the thermal signal into a converted thermal signal. The selecting circuit selects the smaller one of the converted dimming signal and the converted thermal signal and outputs a reference signal based on the selected smaller signal. | 12-24-2015 |
20160066386 | METHOD AND DEVICE FOR REMOTE SENSING AND CONTROL OF LED LIGHTS - Thermally managing at least one light-emitting diode (LED) receiving an operating current and/or an operating voltage and being operable at an operating temperature includes determining a current thermal operating point of the LED, obtaining a thermal operating range of the LED, and calculating a new operating point of the LED based on the current thermal operating point and the thermal operating range, wherein the new operating point is within the thermal operating range. A control signal is generated that adjusts power delivered to the LED to cause the LED to operate at the new operating point. Detection of the operating temperature of the LED may be based on the magnitude of a current pulse superimposed on the operating current provided to the LED and the magnitude of the voltage pulse across the LED resulting from the applied current pulse superimposed on the operating current. | 03-03-2016 |
20160113093 | SYSTEMS AND METHOD FOR LOW LEVEL DIMMING - The present disclosure is directed to an inexpensive yet intelligent solution for dimming light devices to low level intensities in which the common lighting systems generally have difficulties maintaining stability and flicker-free operation. The systems and method described herein enable a lighting system to utilize a dimmer to dim one or more lighting devices to low level intensities without introducing flickering or inconsistent operation of the lights. More specifically, the systems and methods described herein enable a dimmer to dim lights to anywhere between 0% and 5% of maximum brightness, while ensuring that the lights operate at these levels consistently, smoothly and without any visible flickering. | 04-21-2016 |
20160135257 | BLEEDER PROTECTION USING THERMAL FOLDBACK - Thermally protected bleeder circuits for maintaining an input current of a power converter above a dimmer circuit holding current are disclosed. In one example, a bleeder control circuit may generate a bleeder control signal to control a bleeder current of the bleeder circuit based on an input current signal and a temperature signal. The bleeder control circuit may cause the bleeder current to be substantially equal to zero in response to the input current signal being greater than or equal to a reference signal, and may cause the bleeder current to be proportional to a difference between the input current signal and the reference signal in response to the input current signal being less than the reference signal. The reference signal may be constant for temperatures less than a threshold temperature, but may decrease with respect to increases in temperature for temperatures greater than the threshold temperature. | 05-12-2016 |
20160174324 | METHODS AND SYSTEMS FOR MAINTAINING THE ILLUMINATION INTENSITY OF LIGHT EMITTING DIODES | 06-16-2016 |
20160192450 | METHOD AND DEVICE FOR REMOTE SENSING AND CONTROL OF LED LIGHTS - A system and method of thermal management for an LED are provided. A method provided by the system includes (a) providing a forward drive current to power the LED, the forward drive current having a first LED operating current component; (b) detecting the first LED operating current component; (c) sensing a first thermal operating point of the LED; and (d) generating a temperature signal indicative of the first thermal operating point. The method also includes (e) determining a thermal operating range of the LED; (f) determining that the first thermal operating point of the LED is outside the thermal operating range of the LED; and (g) generating a first control setting configured to cause the LED to be driven at a second operating point, the second thermal operating point within the thermal operating range. | 06-30-2016 |
20160192456 | DRIVING CIRCUITS AND METHODS FOR CONTROLLING LIGHT SOURCE - A method for powering a load by a light source driving circuit is disclosed. The method includes: acquiring a first sensing signal indicative of an average current flowing through the load; generating a first temperature detecting signal indicative of an ambient temperature of the light source driving circuit; and adjusting the average current flowing through the load based on the first temperature detecting signal and the first sensing signal to make the average current flowing through the load to be inversely proportional to the ambient temperature of the light source driving circuit if the ambient temperature of the light source driving circuit is between a first temperature threshold and a second temperature threshold. | 06-30-2016 |