Abstract: A temperature monitor and control system for a pixel array includes a first driver connected to a first pixel connected to bus by a first switch, a second driver connected to a second pixel connected to a bus by a second switch, and a control block including connection to the first and second switches. The control block turns on the first switch and turns off the second switch, measures bus voltage, determines an LED forward voltage shift of the first pixel and corresponding temperature shift for the first pixel based on the determined forward voltage shift, and adjusts a driving current for first pixel based on the determined temperature shift.

Abstract: An LED illumination device for improving anti-surge capability includes a circuit substrate, a bridge rectifier chip, a surge absorber group, a first anti-surge current-limiting chip group, a second anti-surge current-limiting chip group, an LED illuminating group, and an LED current-limiting group. The surge absorber group is disposed on the circuit substrate and electrically connected to the bridge rectifier chip for absorbing a surge voltage. The first anti-surge current-limiting chip group is disposed on the circuit substrate for absorbing a first predetermined surge voltage. The second anti-surge current-limiting chip group is disposed on the circuit substrate for absorbing a second predetermined surge voltage. The LED illuminating group includes a plurality of LED chips disposed on the circuit substrate. The LED current-limiting group is disposed on the circuit substrate for controlling a total harmonic distortion of current (THDi) of the LED illuminating group.

Abstract: An apparatus includes a light-emitting diode (LED) driver circuit, one or more LEDs of an LED array, and an electronic switching circuit. The LED driver circuit is configured to generate an electric current. The one or more LEDs are electrically connected to the LED driver circuit. The electronic switching circuit is electrically connected to the one or more LEDs and configured to be placed in one of multiple switching configurations. The electronic switching circuit is further configured to direct a portion of the electric current away from the one or more LEDs, such that a remaining portion of the electric current drives the one or more LEDs. The portion of the electric current corresponds to the one of the multiple switching configurations.

Abstract: A lighting control circuit includes: a light-emitting element which includes a first terminal and a second terminal; a first shunt resistance element which is connected in parallel to the light-emitting element between the first terminal and the second terminal; and a control circuit which turns, into a conducting state, a first current path extending between the first terminal and the second terminal via the first shunt resistance element when a potential difference between the first terminal and the second terminal is greater than a first threshold value and turns, into a non-conducting state, the first current path when the potential difference is smaller than the first threshold value.

Abstract: A vehicle luminaire according to an embodiment includes: a socket; and a light-emitting module which is provided at one end side of the socket. The light-emitting module includes: at least one light-emitting element; a first transistor of which a source is electrically connected to a cathode of the light-emitting element; a negative characteristic thermistor which is electrically connected to a gate of the first transistor; a positive characteristic thermistor which is electrically connected to the gate of the first transistor or a drain of the first transistor; and a second transistor of which a collector is electrically connected to the gate of the first transistor, a base is electrically connected to the drain of the first transistor, and an emitter is electrically connected to an output terminal.

Abstract: This disclosure includes systems, methods, and techniques for controlling a plurality of light-emitting diodes (LEDs). For example, a circuit includes a switching device, where the switching device is electrically connected to an LED of the plurality of LEDs, and where the switching device is configured to control whether the LED receives an electrical signal from a power source. Additionally, the circuit includes processing circuitry configured to determine that the LED is associated with a bright failure condition by attempting to prevent the LED from receiving the electrical signal from the power source using the switching device and disable the LED in response to detecting the bright failure condition.

Abstract: An LED driver for driving a light-emitting device (LED) includes a bridge rectifier, a current driver, and a protection circuit. The bridge rectifier includes a rectifying diode, and the bridge rectifier receives and converts an AC input power source to a DC power source having a DC current and a DC voltage. The current driver includes a constant current source. The bridge rectifier, the current driver, and the protection circuit are connected in series, and the constant current source is used to limit the magnitude of the direct current to drive the LED. The protection circuit includes a protection unit. The protection circuit connects the current driver and the LED. The LED includes a substrate and the rectifying diode, the constant current source, and the protection unit are formed together on the substrate.

Abstract: AN LED tube apparatus has a tube body with two opposite ends fixed to a first cap and a second cap. AN LED module is placed in the tube body. The LED module has a driver circuit containing an electronic ballast that generates high frequency electric current. The first cap has two first metal pins to be inserted in a first socket end of a light tube bracket. The first metal pin clutches an end of a leading wire. The leading wire has a protective portion breaking off when the first metal pin is applied with a predetermined range of heat generated by the high frequency electric current when the LED tube apparatus is not operated properly.

Abstract: An LED tube apparatus has a tube body with two opposite ends fixed to a first cap and a second cap. An LED module is placed in the tube body. The LED module has a driver circuit containing an electronic ballast that generates high frequency electric current. The first cap has two first metal pins to be inserted in a first socket end of a light tube bracket. The first metal pin clutches an end of a leading wire. The leading wire has a protective portion breaking off when the first metal pin is applied with a predetermined range of heat generated by the high frequency electric current when the LED tube apparatus is not operated properly.

Abstract: A lighting apparatus includes a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit. In some embodiments, the at least one low-frequency blocking impedance may be configured to block a DC offset. In further embodiments, the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component. The at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low-frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.

Abstract: A power supply apparatus includes: a main switch element connected to a terminal of a lamp and configured to perform a switching operation; an AC to DC converter configured to an AC to DC converter configured to generate DC power by using a signal of an AC hot line and a signal of the terminal of the lamp; a comparator configured to compare a comparison input signal with a predetermined first reference voltage; and a control signal generator configured to generate a control signal for controlling an operation of the main switch element by using an output signal from the comparator.

Abstract: A controllable driver (1) is provided for driving a load. The controllable driver (1) comprises a primary converter (11) and a control circuit (13) isolated from one another by an opto-isolator (18). The controllable driver (11) is isolated from an output load (19) by a magnetically coupled pair of windings (112, 114); wherein said windings are adapted to provide a voltage supply to said output load. A feedback signal from the output load, indicative of a load current flowing in the second winding, is provided to the control circuit by a winding (12) isolated from the first and second windings (112, 114), such that the control circuit (13) remains isolated from the output load. The control circuit also directly receive input control signal without an opto-isolator. The control circuit is also isolated from the switching core (111) of the primary converter (11) via an opto-isolator.

Abstract: A light emitting device includes a substrate with a circuit incorporated in the substrate, an interposer having a circuit connected to the circuit of the substrate, a light emitting element disposed on the interposer, a transmissive component disposed positioned to the light emitting element, and a frame body having an opening in which the transmissive component is disposed. The light emitting device further includes a ring-shaped body that encompasses the frame body on the substrate, and a sealant making the substrate and the ring-shaped body tightly contact one another. The frame body is disposed so as to encompass the light emitting element on the substrate. This provides the light emitting device with waterproof function.

Abstract: A lighting apparatus includes a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit. In some embodiments, the at least one low-frequency blocking impedance may be configured to block a DC offset. In further embodiments, the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component. The at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low-frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.

Abstract: An organic light-emitting device includes a first substrate, a light-emitting structure layer, a first electrode layer, a second electrode layer, a second substrate, first conduction members, a second conduction member and protection structures. The light-emitting structure layer is disposed on the first substrate. The first electrode layer is disposed on the light-emitting structure layer and includes pad-like patterns. The second electrode layer is disposed between the light-emitting structure layer and the first substrate. The second substrate is adhered on the first electrode layer and includes a first circuit and a second circuit. The first circuit includes a continuous pattern and contact portions. The first conduction members are connected between the first circuit and the first electrode layer. The second conduction member is connected between the second circuit and the second electrode layer.

Abstract: Disclosed is an organic light emitting device (OLED) that may include a first electrode including at least two conductive units that are immediately adjacent to each other; a second electrode facing the first electrode; an organic layer between the first electrode and the second electrode; and an auxiliary electrode electrically connected to the first electrode, the auxiliary electrode including at least two branch points that are immediately adjacent to each other, each branch point having at least three branches, wherein a resistance between the at least two branch points is 35? or less, and wherein a resistance between the at least two conductive units is 2,000? or more and 600,000? or less.

Abstract: An LED lighting device driven by a rectified AC voltage includes a luminescent device, a charge storage unit and a current controller. The charge storage unit is configured to turn on the luminescent device when the rectified AC voltage is still insufficient to turn on the luminescent device. The current control unit is configured to allow the LED lighting device to have constant luminance regardless of the level of the rectified AC voltage, thereby improving flicker phenomenon.

Abstract: Provided is a lighting apparatus using an LED as a lighting source. The lighting apparatus may distribute a current corresponding to a rectified voltage to a lighting unit and a secondary current circuit, perform primary light emission at low luminance, and reduce an optical deviation between LED groups through secondary light emission. Thus, the lighting apparatus can reduce an optical deviation corresponding to dimming and one cycle of rectified voltage.

Abstract: An optoelectronic component device includes a first group of optoelectronic components including at least one first optoelectronic component, wherein the at least one first optoelectronic component provides electromagnetic radiation of a first color valence, a second group of optoelectronic components including at least one second optoelectronic component, wherein the at least one second optoelectronic component provides electromagnetic radiation of a second color valence, and a phase dimmer, wherein the phase dimmer is designed in such a way that a first operating mode and a second operating mode are provided, wherein the phase dimmer actuates the first and the second group of optoelectronic components in such a way that, in the first operating mode, a first array of optoelectronic components of the optoelectronic component device is energized and, in the second operating mode, a second array of optoelectronic components of the optoelectronic component device is energized.

Abstract: An apparatus for determining and/or monitoring at least one process variable of a medium. The apparatus includes at least one probe unit and at least one electronics unit, which supplies the probe unit with an electrical, exciter signal and which receives from the probe unit an electrical, measurement signal. The invention includes, that the probe unit has at least one inner electrode and at least one outer electrode surrounding the inner electrode.

Abstract: A backlight unit includes: a light source configured to emit light based on a driving current; a sensing resistor configured to generate a sensing voltage based on the driving current; a first comparator configured to compare the sensing voltage to a first reference voltage divided from a reference power to thereby produce a first comparison signal; a first switching element controlled by the first comparison signal applied from the first comparator to thereby switch the sensing voltage; a second comparator configured to compare the sensing voltage applied via the first switching element to a first ramp signal to thereby produce a second comparison signal; a current control switching element configured to control an amount of the driving current based on the reference power and a current control signal applied from a current controller; an abnormality detector configured to convert the second comparison signal applied from the second comparator into a DC voltage and to compare the DC voltage to a critical vol

Abstract: Light sources (1) for replacing fluorescent lamps (100) are provided with terminals (11, 12) for exchanging alternating current signals having frequencies of at least kHz with drivers (5), with rectifiers (13) having inputs coupled to the terminals (11, 12) via capacitors (14), and with light emitting diodes (15) coupled to outputs of the rectifiers (13). The rectifiers (13) rectify the alternating current signals and the capacitors (14) provide safety to persons installing the light sources (1). Preferably, the light sources (1) have different ends where the different terminals (11, 12) are located. Each terminal (11, 12) may comprise two pins (21, 22, 23, 24) interconnected via fuses (31,32). Drivers (5) for replacing fluorescent ballasts (500) are provided with inputs (51, 52) to be connected to voltage sources (6)and with outputs (53, 55) for exchanging the alternating current signals with the light sources (1).

Abstract: An interface circuit is disclosed for operating a light source from an electronic fluorescent driver. In one example, the interface circuit comprises input terminals for connection to lamp connection terminals of the electronic fluorescent lamp driver, a first string interconnecting a first pair of input terminals, a second string interconnecting a second pair of input terminals, a third string interconnecting a first terminal of the first string and a second terminal of the second string and comprising a rectifier, output terminals of said rectifier being coupled during operation to the light source. When a light source is operated making use of the interface circuit, a proper emulation of a fluorescent lamp is obtained.

Abstract: A light-emitting diode arrangement includes a light-emitting diode and a coding resistor for coding the light-emitting diode. The coding resistor is embodied as a star connection of a number of resistors. Furthermore, a module includes a plurality of light-emitting diode arrangements. Furthermore, a method for producing a light-emitting diode arrangement is specified, wherein the coding of a coding resistor is carried out depending on a determined characteristic of the light-emitting diode.

Abstract: The present invention relates to an LED driving device and a method for driving an LED by using the same. According to one aspect of the present invention, an LED driving device includes: a light source unit including first to nth LED groups sequentially connected in series; and a driving control unit having first to nth input terminals respectively connected to output terminals of the first to nth LED groups for controlling each of first to nth input currents which are inputted to the first to nth input terminals through first to nth current sensing signals generated by reflecting the first to nth input currents at predetermined ratios.

Abstract: A switching mode power supply apparatus includes a main transformer converting DC voltage of a predetermined amplitude supplied from a voltage source into DC voltage of a different amplitude; an auxiliary transformer operated by receiving current flowing in a primary winding of the main transformer; a first semiconductor switching element turning on/off an LED array that is driven by receiving voltage from a secondary winding of the auxiliary transformer; and an auxiliary circuit disposed in an LED control circuit unit including the LED array and the first semiconductor switching element, wherein the auxiliary circuit distributes current flowing in the first semiconductor switching element so as to reduce heat generated in the first semiconductor switching element.

Abstract: The present invention is directed to an electrical wiring assembly that includes a wall plate cover, a housing portion and an electro-optical assembly coupled to a plurality of wiring terminations. The assembly includes a circuit configured to provide an output signal in response to an external input signal. The assembly also includes a plurality of lighting elements coupled to the circuit and configured to emit the plurality of light beams in response to the output signal. The electro-optical assembly further includes an ambient light sensor accessible to the ambient space via at least one of the plurality of openings. The ambient light sensor is configured to generate the at least one external input signal in response to an ambient light level in the ambient space, the ambient light sensor being substantially isolated from the plurality of light beams.

Abstract: A semiconductor component and a method for manufacturing the semiconductor component, wherein the semiconductor component includes one or more transient voltage suppression structures. In an embodiment, the semiconductor component may include an over-voltage detection circuit, an over-current detection circuit, an over-temperature detection circuit, an ESD protection circuit, or combinations of these circuits.

Abstract: A microcomputer of a light source control device specifies an LED belonging to LEDs and subjected to a short-circuit failure based on a result of determination by a short-circuit failure detecting circuit and current amounts sensed by current sensing circuits respectively. The microcomputer makes corresponding one of switching elements interrupt supply of a current to the specified LED. The microcomputer makes a constant current circuit supply an LED not specified with a current not exceeding a current responsive to the number of such LEDs not specified.

Abstract: A dimmable alternating current (AC) driven light emitting diode (LED) illuminating apparatus including a TRIAC dimmer configured to perform a dimming control using a phase control.

Abstract: An LED lamp with an integrated circuit, a rectifier, and a string of series-connected LEDs rectifies an incoming AC signal. The integrated circuit includes power switches that can separately and selectably short out a corresponding one of several groups of LEDs in an LED string across which the rectified AC signal is present. As the voltage across the string increases, the integrated circuit controls the power switches to increase the number of LEDs through which current flows, whereas as the voltage across the string decreases the integrated circuit controls the power switches to decrease the number of LEDs through which current flows. The flow of LED string current is broken to reduce flicker. Alternatively, a valley fill capacitor peaks LED current during the valleys of the incoming AC signal to reduce flicker. LED current is regulated to provide superior efficiency, reliability, power-factor correction, and lamp over-voltage, -current, and -temperature protection.

Abstract: A load driving apparatus including a power conversion circuit, a current balance circuit, a protection unit and a control chip is provided. The power conversion circuit is configured to receive a DC input voltage, and provide a DC output voltage to a plurality of light emitting units in response to a control signal. The current balance circuit has a plurality of switch elements corresponding to the light emitting units, and is configured to balance currents flowing through the light emitting units. The protection unit detects statuses of the switch elements and/or the DC output voltage. The control chip generates the control signal to control operations of the power conversion circuit; and stops generating the control signal and enters into a shutdown status when any one of the switch elements is open-circuit and/or the DC output voltage is over-voltage, thereby protecting the load driving apparatus and/or the switch elements from damaging.

Abstract: A dual-pixel circuit includes first and second OLEDs, and a driving circuit that includes first and second driving transistors, a capacitor, and a switching module operable between first and second modes based on a data voltage, first and second scan voltages, and first and second bias signals. When the switching module is operated in the first mode, the first OLED is forward-biased to emit light, and the second OLED is reverse-biased. When the switching module is operated in the second mode, the first OLED is reverse-biased, and the second OLED is forward-biased to emit light.

Abstract: A circuit is disclosed for determining which of a multiplicity of LED strings in an illumination system has a fault. A group of circuits determines the maximum, minimum, midpoint between maximum and minimum, and average voltage of the group of LED string voltages in use, and examines the statistical properties of the LED string voltages. Comparators are used to find the strings which have the highest and lowest operating voltages, and to compare the midpoint and average voltages to determine whether the highest or lowest voltage string is responsible for causing a fault in the illumination system operation. Memory means are used to keep the said determined string turned off to prevent faulty operation.

Abstract: The present invention relates to a driving circuit of LED and a driving method thereof, which comprise a converting circuit and a driving unit. The converting circuit receives a pulse-width modulation (PWM) signal and generates an adjusting current according to the PWM signal. The driving unit receives the adjusting current and generates at least a driving current according to the adjusting current for driving a plurality of LEDs coupled to the driving unit. The magnitude of the driving current is adjusted according to the adjusting current. In addition, the driving unit has a bright-controlling pin used for receiving a control signal having a fixed level.

Abstract: The present invention discloses a white LED light emitting device driven directly by constant current in manner of being supplied with alternating current. N parallel branches, consisting of LED modules and constant current units which are in series connection with the LED modules, are connected to an output terminal of a rectification circuit, and by setting the current value, the turning-off voltage, and the turning-on voltage of the constant current unit of each branch, the periodic flickers generated due to changes in the voltage of the alternating current can be avoided. Because the current of each branch is constant, the changes in junction temperatures do not result in the current changing in LED, and the reliability is improved. Along with the increase of the number of the branches, the driving current waveform approximates a sine wave, and the power factor and the efficiency of the light emitting device are improved.

Abstract: A ballast is designed to adaptively warm-up one or more lamps driven by the ballast when the lamps are dimmed to a selected dimming level and lamp impedance instability results. The ballast can therefore maintain a stable light output in low ambient temperature conditions that normally cause lamp impedance instability and visible flickering of the lamp. The ballast uses lamp impedance sensing circuit to sense lamp instability and adaptively warms up the lamp whenever the ballast detects lamp instability by increasing the current provided to the lamp (i.e., current through the lamp) for a predetermined period of time.

Abstract: The invention provides a backlight driving circuit, an LCD device, and a manufacturing method thereof. The backlight driving circuit includes at least two LED lightbars arranged in parallel connection, the output end of each of the LED lightbars is coupled with a variable current circuit, and the variable current circuit is provided with adjustable variable resistors used for balancing the voltage difference between the LED lightbars. In the invention, because the adjustable variable resistors are arranged in the variable current circuit which is connected in series with the LED lightbars, the resistance of the adjustable variable resistors can be adjusted according to the resistance of different LED lightbars before being used; thus, the total voltage of each LED lightbar and the variable resistor connected with ed LED lightbars in series can keep consistent.

Abstract: An LED drive circuit is disclosed, which comprises a square wave generator configured to generate a square-wave signal for driving an LED unit, an LLC resonance circuit configured to transform the square-wave signal outputted by the square wave generator into a sinuous wave of a reduced voltage level, and the LED unit comprising at least one LED sub-unit. The LED sub-unit comprises at least a first LED lamp set and a second LED lamp set connected in parallel, and LEDs of the first LED lamp set are disposed in a direction opposite to those of the second LED lamp set. The square wave generator, the LLC resonance circuit and the LED unit are connected in sequence. The LED drive circuit of the present disclosure can drive an LED and has a reduced cost.

Abstract: A light-emitting diode includes at least one light-emitting diode chip, a carrier for the at least one light-emitting diode chip, and at least one control device integrated into the carrier, wherein each of the light-emitting diode chips is electrically connected to one of the at least one control devices, each of the at least one control devices includes a data storage device in which brightness data for each light-emitting diode chip which is connected to the control device is stored, and the control device drives the connected light-emitting diode chip with a current which is selected according to stored brightness data for the light-emitting diode chip.

Abstract: An organic light emitting display device employing organic light emitting diodes (OLEDs) is disclosed. One aspect includes a plurality of pixels positioned at intersection portions of scan lines and data lines, each having an organic light emitting diode and a pixel circuit driving the organic light emitting diode; a scan driver supplying a scan signal to the scan lines and supplying an emission control signal to an emission control line coupled to the pixels; and a data driver supplying a data signal to the data lines. In such organic light emitting display, the pixel circuit within each pixel includes three or more transistors and one or more capacitors, and the transistors included in a pixel circuit of some of the pixels is formed to be in a state in which the transistor is isolated from the other circuit devices in the pixel circuit or in a state in which the electrodes of the transistor are short-circuited.

Abstract: Driver circuits (1) for driving load circuits (2) comprising first and second light circuits (21-22, 71-72) are in first/second modes for input voltages having first/second voltage amplitudes, the second voltage amplitudes being larger than the first voltage amplitudes. The first light circuits (21, 71) are on in the first and second modes. The second light circuits (22, 72) are off in the first modes and are on in the second modes. A control circuit (21, 71) in dependence of the modes to extend control. These currents may get smaller current amplitudes in higher modes. Light outputs of the first light circuit (21, 71) may get smaller in higher modes. A total light output of all light circuits (21-22, 71-72) may remain substantially constant during all modes.

Abstract: A current regulator for non-isolated, line voltage LED Driver circuits solves the problem of LED flicker caused by line noise in the visible frequency range. In one aspect of the invention, LED flicker frequency may be increased beyond the line frequency. In another aspect, line voltages in excess of LED voltage ratings may be tolerated. The driver may be implemented using discrete circuit elements or in software and utilizes separate current regulation for different segments of an AC line voltage cycle.

Abstract: An apparatus and computer readable storage medium are disclosed for supplying power to a load such as a plurality of light emitting diodes. A representative apparatus comprises a primary module, a first secondary module couplable to a first load, and a second secondary module couplable to a second load. The primary module comprises a transformer having a transformer primary. The first secondary module comprises a first transformer secondary magnetically coupled to the transformer primary, and the second secondary module comprises a second transformer secondary magnetically coupled to the transformer primary, with the second secondary module couplable through the first or second load to the first secondary module.

Abstract: Embodiments may provide a first device that may comprise a substrate, a plurality of conductive bus lines disposed over the substrate, and a plurality of OLED circuit elements disposed on the substrate, where each of the OLED circuit elements comprises one and only one pixel electrically connected in series with a fuse. Each pixel may further comprise a first electrode, a second electrode, and an organic electroluminescent (EL) material disposed between the first and the second electrodes. The fuse of each of the plurality of OLED circuit elements may electrically connect each of the OLED circuit elements to at least one of the plurality of bus lines. Each of the plurality of bus lines may be electrically connected to a plurality of OLED circuit elements that are commonly addressable and at least two of the bus lines may be separately addressable.

Abstract: A driving controller for driving a load is disclosed. The driving circuit includes a driving power supply and the driving controller. The driving power supply provides a first power source to the load. The controller is coupled to a second power source to receive an electric power for operating. The controller controls the amount of the electric power to the load when operating in a first mode and stops the driving power supply from providing the electric power to the load when operating in a second mode. The controller operates exclusively in the first mode before the driving power supply provides the first power source to the load.

Abstract: A circuit arrangement may include: an inverter comprising first electronic and second electronic switches coupled in series between a first and second input connections to form a bridge center point; a drive apparatus for the first electronic switch and the second electronic switch; a current-measuring apparatus which is designed and arranged to measure the current through the inverter; a short-circuiting apparatus which is designed to short-circuit the output when the output voltage exceeds a first predefinable threshold value; and an evaluation apparatus which is coupled to the current-measuring apparatus and is designed to determine the mean value of the current through the inverter and, when the mean value undershoots a second predefinable threshold value, to drive the drive apparatus in such a manner that the latter influences the operation of the inverter, by driving the electronic switches in such a manner that the current in the short-circuiting apparatus is reduced.

Abstract: An LED driving circuit comprises a converting circuit, a current regulator, a converting controller and a low dimming protection blocking circuit, is disclosed. The converting circuit is adapted to perform a power conversion to provide a driving voltage for lighting an LED module. The current regulator is coupled to the LED module for regulating a current flowing through the LED module. The current regulator conducts and stops conducting the current flowing through the LED module according to a dimming signal, and executes a protection process when the LED module operates abnormal. The converting controller controls the power conversion of the converting circuit according to a voltage level of at least one connection node of the current regulator and the LED module. The low dimming protection blocking circuit stops the protection process of the current regulator when the driving voltage is lower than a predetermined value.

Abstract: An LED drive circuit that can increase the amount of light with a compact structure. This circuit includes series-connected LEDs, first and second DC power supplies connected in series so as to apply a forward bias to the LEDs, a coil that is series-connected with the LEDs and can accumulate energy from current generated by the DC power supplies, a rectifying element whose cathode is connected between the DC power supplies, a transfer switching element connected to the anode of the rectifying element, and a control apparatus for controlling the transfer switching element. A first closed circuit is formed by the LEDs, the DC power supplies, and the coil when the transfer switching element is switched on by the control apparatus, and a second closed circuit is formed by the LEDs, the second DC power supply, the coil, and the rectifying element when the transfer switching element is switched off.

Abstract: The present invention is directed to an electrical wiring device that includes at least one circuit configured to provide an output signal in response to at least one external input signal. The device further comprises a light emission and detection assembly that includes: a lamp sub-assembly coupled to the at least one circuit, the lamp subassembly including at least one light emitting element configured to emit light in response to the output signal; and an ambient light sensor sub-assembly coupled to the at least one circuit and including an ambient light sensor and a sensor housing assembly, the ambient light sensor being configured to generate the at least one external input signal in response to sensing an ambient light level in the space, the sensor housing assembly being configured to substantially isolate the ambient light sensor from the light emitted by the lamp sub-assembly.