Abstract: The disclosure provides a driving apparatus and a method for driving a semiconductor light-emitting device assembly. The apparatus includes: a driving unit configured to drive the semiconductor light-emitting device assembly; and a cycle by cycle control unit. The cycle by cycle control unit may include: a sampling circuit configured to sample a current instantaneous value of the driving unit or the semiconductor light-emitting device assembly; and an adjusting circuit configured to adjust an output of the driving unit when the current instantaneous value sampled by the sampling circuit is larger than or equal to a preset reference value. The driving apparatus and method for driving the semiconductor light-emitting device assembly may effectively reduce an inrush current on the light-emitting devices and have a lower cost.

Abstract: A light emitting diode (LED) lighting system includes a switching power converter having an input for coupling to an alternating current (AC) power source, an output, and a switch. The LED lighting system also includes an LED lighting subsystem coupled to receive power from the output of the switching power converter. The LED lighting subsystem includes a current source for one or more LEDs, and the current source has a control node and a sense node. The LED lighting system additionally includes a switch state controller coupled to the switching power converter and coupled to the LED lighting subsystem. The switch state controller controls switching of the switch and varies a control current provided to the control node of the current source based on at least a parameter sensed from the sense node.

Abstract: Embodiments of the invention provide AC LED lighting apparatuses. The AC LED lighting apparatuses may increase luminous flux and provide optimal efficiency through novel arrangement of a plurality of light emitting blocks on a circuit board and a plurality of LEDs and drive ICs included in each of the light emitting blocks to be sequentially driven, and/or through efficient series-parallel connection between a limited number of LEDs.

Abstract: Systems and methods for a current sharing driver for light emitting diodes are disclosed. One disclosed system includes: a first string of LEDs; a second string of LEDs connected in parallel with the first string; a first current control device connected in series with the first string of LEDs; a second current control device connected in series with the second string of LEDs; a first voltage measurement device coupled to the first string of LEDs and the second string of LEDs, the first voltage measurement circuit coupled to the first current control device and configured to control the first current control device; and a second voltage measurement device coupled to the first string of LEDs and the second string of LEDs, the second voltage measurement circuit coupled to the second current control device and configured to control the second current control device.

Abstract: The present invention provides an LED (Light-Emitting Diode) driving control circuit for controlling a converting circuit to transform an input power source into an output voltage for driving an LED module. The LED module has a plurality of LED strings. The LED driving control circuit includes a voltage detecting circuit and a feedback control circuit. The voltage detecting circuit has a plurality of detection circuits, and each detection circuit is coupled to a terminal of the corresponding LED string to determine whether a voltage of the terminal is higher or lower than a preset value. The voltage detecting circuit generates a feedback signal according to the determination results. The feedback control circuit controls the converting circuit to modulate the output voltage according to the feedback signal.

Abstract: An exemplary light emitting diode (LED) driving system includes a direct current/direct current (DC/DC) converter, a detection circuit, a control circuit, a pulse width modulation (PWM) controller, and a current balance circuit. The DC/DC converter outputs a suitable direct current voltage to drive an LED array. The detection circuit detects cathode voltages of LED strings of the LED array. The control circuit generates and outputs a control signal to the PWM controller, and generates and outputs various adjusting signals. The current balance circuit adjusts current flowing through two of the LED strings, which have a minimum and a maximum detected cathode voltage, respectively. The current balance circuit includes switches. A related LED driving method is also provided.

Abstract: A backlight unit includes a DC-DC converter; a voltage control unit which controls output voltage of the DC-DC converter; a plurality of unit light emitting diode arrays; and current deviation compensating unit in connection with input terminals of the plurality of unit light emitting diode arrays. The current deviation compensating unit receives the controlled voltage of the voltage control unit and transfers a feedback signal to the voltage control unit based on the received voltage, and actively compensates a current deviation generated by electrical characteristics of the plurality of unit light emitting diode arrays and transfers the compensated current deviation to the input terminals of the plurality of unit light emitting diode arrays.

Abstract: An LED driving device has a first constant current source circuit and a voltage control circuit. The first constant current source outputs a first constant current to a first node and the first constant current flows into a first LED module disposed between a driving node and the first node; wherein, the first constant current source circuit has a first detection node for generating a first detection signal in response to the voltage level of the first node. The voltage control circuit is coupled to the first detection node, for outputting a control signal in response to the first detection signal to a voltage regulator circuit in order to control and modulate the voltage regulator circuit to output a driving voltage to the driving node.

Abstract: Disclosed is an improved light-emitting device for an AC power operation. A conventional light emitting device employs an AC light-emitting diode having arrays of light emitting cells connected in reverse parallel. The arrays in the prior art alternately repeat on/off in response to a phase change of an AC power source, resulting in short light emission time during a ½ cycle and the occurrence of a flicker effect. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor.

Abstract: An LED light set includes a controller connected with an electric plug and a main light string of a plurality of main light bulbs in serial arrangement. Each of the main light bulbs is connected with an associate light string of a plurality of associate light bulbs. A main control IC is provided in the controller to control voltage and current supplied to the main light bulbs of the main light string. An associate control IC is provided within each of the main light bulbs to control voltage and current supplied to the associate light bulbs of the associate light string. The voltage and current supplied to the associate light strings are controlled to be lower than those supplied to the main light string so that conducting wires of each of the associate light string can be made thinner than conducting wires of the main light string.

Abstract: The present invention discloses a direct type LED backlight and a liquid crystal display thereof. The direct type LED backlight comprises a power converting circuit, which transfers an alternating current voltage generated from an external liquid crystal display into direct an current voltage and outputs it; multiple LED strings connected in parallel, wherein each LED string comprises a predetermined amount of LED connected in parallel, which receives a direct current from the power converting circuit; wherein, the predetermined amount is limited to that the direct current of the LED string emitting light normally is smaller than or equal to the direct current output from the power converting circuit. According to the direct type LED backlight of the present invention, it can avoid using a boost circuit in order to decrease circuit complexity and save costs.

Abstract: The present invention provides construction improvement of LED light set mainly including a controller connected with an electricity plug and a main light string of a plurality of main light bulbs in serial arrangement while each of the main light bulbs is individually connected with an associate light string of a plurality of associate light bulbs as characterized in that a main control IC is provided within the controller to control the main light string operation and an associate control IC is provided within each main light bulb to control the associate light string operation. Thereby the capability of the associate control IC within each main light bulb to reduce both voltage and current is utilized to enable every associate light string to use an associate conducting wire thinner than a main conducting wire in order to reduce the manufacturing cost significantly.

Abstract: A lighting device employs at least one string of LEDs as a lighting source. The string of LEDs may be coupled in series between a power supply node and ground. In order to accurately determine a drive current running through or drive voltage across the string of LEDs, the drive current through the string of LEDs or the drive voltage across the string of LEDs is sampled randomly or semi-randomly, and a moving average is determined from each one of the samples. By sampling the drive current through or drive voltage across the string of LEDs randomly or semi-randomly, inaccuracies due to synchronization of the sampling with interference in the drive current signal or the drive voltage signal are effectively prevented. Accordingly, an accurate measurement of the drive current through or the drive voltage across the string of LEDs may be obtained.

Abstract: Provided is a circuit for adjusting light-emitting diode (LED) current; the circuit comprises: a single-output constant current source (21), a multi-path LED output circuit (22) and a control bus (20) connected to the multi-path LED output circuit (22); any given LED output circuit comprises: a load circuit (23), an adjustment circuit (24), a current regulation circuit (25) and an adjustment control circuit (26). The circuit for adjusting LED current provided in the technical solution of the present invention adjusts the current of each LED output circuit via the load circuit, the adjustment circuit, the current regulation circuit and the adjustment control circuit, thus adjusting characteristic parameters such as color, color temperature, color rendering index, brightness and the like of the LED light source, thereby avoiding the problem of high cost caused by using multi-path constant current DC/DC circuit to adjust the current of each path.

Abstract: Illumination devices (10), systems and methods that convert an alternating current (AC) supply (14) to a direct current (DC) for powering a plurality of light emitting diodes (LEDs) are disclosed. An illumination device (10) comprises a full wave rectifier (12) for converting the AC supply into a direct current (DC). A current limiting diode (CLD) module (16), comprising at least one CLD is coupled in series to an output of the full wave rectifier and a light emitting diode (LED) module (18) comprising a plurality of LEDs is coupled in series between an output of the CLD module (16) and the full wave rectifier (12).

Abstract: An enhanced control mechanism for an LED light string system is provided for switching between one of two DC output phases or polarities so as to actuate one or the other of two LEDs within the bulbs on the light string. The control mechanism is further configured to allow switching so as to pass through the input power provided by a high-to-low voltage converter that is plugged into its electrical power feeding end. The control mechanism may then provide rectified AC voltage, or DC voltage, of various switched values to the LED string according to the particular needs of the LED bulbs.

Abstract: Semiconductor light emitting devices are provided that include a first string of light emitting diodes (“LED”) that emit unsaturated light having a color point that is within at least eight MacAdam ellipses of one or more points within a first blue-shifted-yellow region on the 1931 CIE Chromaticity Diagram, a second string of LEDs that emit unsaturated light having color point that is within at least eight MacAdam ellipses from one or more points within a second blue-shifted-green region on the 1931 CIE Chromaticity Diagram, and a third light source that emits radiation having a dominant wavelength between 600 and 720 nm. A drive circuit is provided that is configured to supply a first drive current to the first string of LEDs, a second drive current to the second string of LEDs and a third drive current to the third string of LEDs, wherein at least two of the first, second and third drive currents are independently controllable.

Abstract: When a pulsating current is applied to an LED string included in an LED lighting device, and the number of LEDs caused to light up is changed, the LED lighting device is in efficient, since there are LEDs lighting up for a long period of time and LEDs lighting up only for a short period of time. The LED string includes LED string 407 that lights up for a long period of time and LED string 408 that lights up only for a short period of time within a period of the pulsating current. The element size of the LED 102 included in LED string 407 is different from the element size of LED 203 string 408. Thus, the amount of light emission per unit area LED string 407 may be equal to the amount of light emission per unit area LED string 408.

Abstract: An LED driver circuit for controlling direct current supplied to a plurality of serially connected segments of Light Emitting Diodes (LEDs) is disclosed. In one embodiment, the LED driver circuit comprises a self-commutating circuit, which comprises a plurality of current control elements, each current control element having two ends, a first end connected to a different end of each segment along the plurality of serially connected segments of LEDs and a second end connected to a path to ground. The path to ground comprises a sense resistor and the path to ground is shared by the second end of each current control element. Each current control element is coupled to an adjacent current control element by a cross-regulation circuit and controlled by a signal from an adjacent current control element.

Abstract: An LED flash module includes: a module substrate; an energy device disposed on the module substrate; an LED module arranged on the module substrate includes a plurality of LED blocks arranged in a first direction, each LED block including a plurality of LED elements which is arranged in a second direction perpendicular to the first direction and emits light with power supplied from the energy device; a charger circuit arranged on the module substrate to charge the energy device; and a control circuit arranged on the module substrate to control emission of LED elements. A wiring length from one of the LED elements to a plus terminal of a power supply portion supplying power to each of the LED elements and a wiring length from the one of the LED elements to a minus terminal of the power supply portion is substantially the same for all of the LED elements.

Abstract: A light string power module is provided for providing power to light strings while replicating a lighting pattern from a first light string in providing said power. The illumination pattern of the first light string, which is not powered by the light string power module, is detected by examining the voltage polarities presented on the leads of a first connector to which the first light string is attached. These detected polarities are replicated by a switching module at matching leads on a second connector to which a second light string is attached. A power processing module accepts input power and provides output DC power to the switching module such that the second light string is powered by said output DC power in concert with the replicated voltage polarities so as to replicate the light pattern presented by the first light string on the second light string.

Abstract: A demand-side dimmable LED lamp operable on a direct current power source that powers a lighting subsystem. The dimming unit selects a power consumption level of the lighting system. Such selection changes the efficacy of the lighting subsystem such that a reduction in power consumption actually results in improved efficacy. The selecting might, for example, select a particular passive network that includes LEDs within the lighting subsystem. Each passive network may have different I-V characteristics, and result in different L-P characteristics, thereby effecting the improved efficacy at lower powers.

Abstract: An apparatus and method for compensating for a current deviation are provided. A current is applied through a light emitting diode (LED) array to which LEDs are connected. A current deviation is compensated among each respective string of the LED array using at least one constant current circuit connected to each of the respective strings.

Abstract: An emitting device includes a first electrode on a base substrate, a second electrode on the base substrate, a third electrode on the base substrate, an emitting structure on and/or at a same level as the first electrode, a first pattern on the base substrate being electrically connected to the first electrode, and a plurality of second patterns on the base substrate, wherein at least one of the second patterns is arranged on a first side of the first pattern and is electrically connected to the second electrode and at least another one of the second patterns is arranged on a second side of the first pattern and is electrically connected to the third electrode, the first side opposing the second side.

Abstract: The present application discloses a light-emitting diode (LED) lighting system, including: a toroidal transformer comprising a pair of input terminals and a pair of output terminals; and an illuminant comprising an LED circuit; wherein the illuminant is electrically connected to the pair of output terminals of the toroidal transformer. The present application uses a toroidal transformer to simplify a circuit and reduce the number of electronic parts used. On one hand, a service life of a product can be prolonged, and on the other hand, costs can be reduced and a recycling rate is high, which is beneficial to environmental protection.

Abstract: An LED lamp comprising a housing, a drive circuit, and a plurality of LED dies driven by the drive circuit, The plurality of LED dies may be in a ratio of at least one of 15 mint LED dies to 5 hyper red LED dies to 4 blue LED dies and 1 mint LED die to 1 hyper red LED die to 1 blue LED die. The drive circuit may operate the LED dies such that a relative peak intensity of the blue LED dies is within the range from 80%-90% or 90%-100% of a peak intensity of the hyper red LED dies, and a relative peak intensity of the mint LED dies is within the range of 50%-60% or 30%-40% of the peak intensity of the hyper red LED dies.

Abstract: Self-identifying solid-state transducer (SST) modules and associated systems and methods are disclosed herein. In several embodiments, for example, an SST system can include a driver and at least one SST module electrically coupled to the driver. Each SST module can include an SST and a sense resistor. The sense resistors of each SST module can have at least substantially similar resistance values. The SSTs of the SST modules can be coupled in parallel across an SST channel to the driver, and the sense resistors of the SST modules can be coupled in parallel across a sense channel to the driver. The driver can be configured to measure a sense resistance across the sense resistors and deliver a current across the SSTs based on the sense resistance.

Abstract: A light emitting element driving device, which flashing-drive a plurality of light emitting element arrays connected in parallel by switching elements connected in series with each of the plurality of light emitting element arrays, the light emitting element driving device including: a current detection unit configured to detect respective currents flowing through each of the plurality of light emitting element arrays as currents of the light emitting element arrays; a selection unit configured to select the smallest current of the light emitting element arrays of the detected currents obtained by the current detection unit; and an output voltage control unit configured to control output voltage supplied to the plurality of light emitting element arrays so that the current of the light emitting element arrays selected by the selection unit becomes a preset reference current value.

Abstract: Disclosed is a structure of a color mixing circuit of an LED light. The LED light includes two input pins that are respectively an input pin of two light emitting chips of four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an input pin of the remaining two light emitting chips that are connected in parallel and opposite in direction; and two output pins that are respectively an output pin of the two light emitting chips of the four primary color light emitting chips of R, G, B, and Y that correspond to one of the input pins and are connected in parallel and opposite in direction and an output pin of the remaining two light emitting chips that correspond to another one of the input pins and are connected in parallel and opposite in direction.

Abstract: Disclosed is a structure of a color mixture synchronization circuit of an LED light string. The LED light string includes a plurality of LED lights each of which has two input pins that are respectively an input pin of two light emitting chips of four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an input pin of the remaining two light emitting chips that are connected in parallel and opposite in direction; and two output pins that are respectively an output pin of the two light emitting chips of the four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an output pin of the remaining two light emitting chips that are connected in parallel and opposite in direction.

Abstract: A LED backlight source and a liquid crystal device are disclosed. The LED backlight source includes: a boost circuit for boosting an input DC voltage and for outputting the boosted DC voltage; a plurality of LED strings connected in parallel, wherein each of the LED strings comprises a plurality of serially connected LEDs and a first resistor, and each of the LED strings receives the boosted DC voltage from the boost circuit; an over-current protection circuit for controlling an output power of the boost circuit according to a detected resistance; and a short-connection protection circuit for adjusting the resistance detected by the over-current protection circuit according to a voltage at two ends of the first resistor.

Abstract: The present invention proposes an LED backlight driving circuit comprises voltage booster circuits parallelly connected and a constant current driving IC module. The voltage booster circuits are used for conversing an input voltage into a needed output voltage to supply to an LED unit. The constant current driving IC module is used for controlling the voltage booster circuits, so that the voltage booster circuits converse the input voltage into the needed output voltage to supply to the LED unit, driving the LED unit in a constant current. The constant current driving IC module generates driving signals at different frequencies to control the voltage booster circuits respectively. The invention can set up multiple driving signals operating simultaneously at different frequencies respectively and disperse resulting harmonic wave, hence reduce EMI signals of the backlight driving circuit effectively. The present invention also proposes an LCD using the LED backlight driving circuit.

Abstract: A control circuit performs ON/OFF control for a switching element so that LED current flowing in an LED unit is within a rated current range. In the case where the LED unit is lit, a voltage applied between both ends of series connection of a reactor and the LED unit becomes a first bus voltage, when the switching element is ON, and becomes a voltage lower than the first bus voltage, that is determined based on the first bus voltage and a second bus voltage, when a switching element is OFF.

Abstract: An apparatus includes a bus configured to be coupled to a controlled current source and at least one light emitting device coupled to the bus. The apparatus further includes a voltage regulator circuit configured to regulate a voltage at the bus and a current regulator circuit configured to control a current through the at least one light emitting device. The current regulator circuit may be used to control a color output of the apparatus.

Abstract: An LED illumination device includes an LED package and a switch electrically connecting the LED package. The LED package includes a first lamp group and a second lamp group installed in parallel. A direction of the current of the first lamp group is inverted to that of the second lamp group. Different contact parts of the switch respectively connect a power source to make the first lamp group and the second lamp group on or off respectively.

Abstract: A ceiling lamp adopting a non-separating driver circuit includes a conversion module and a control module. The conversion module converts an input voltage into an operating voltage to drive the LEDs and forming a driving current, and the control module monitors the operating voltage and the driving current to adjust the operating cycle of the conversion module, change the output voltage value of the operating voltage, and linearly change the driving current at a constant current state. The conversion module just executes the power conversion for one time to provide the driving power of the LEDs instead of using the conventional driving method that executes a two-stage power conversion by a separating power converter and a negative booster of the conventional ceiling lamp. Therefore, the ceiling lamp adopting a non-separating driver circuit is capable of lowering the circuit cost and improving the operating efficiency.

Abstract: A LED based lighting apparatus is disclosed. The light engine used in the lighting apparatus may use a multi-layer metal core printed circuit board and have a plurality of LED groups that are independently controllable by a control unit. The power supply input and return paths connected to each LED group may be implemented on different layers to allow a compact footprint that may be used with traditional fluorescent encasements with relatively little modification.

Abstract: A light emitting diode (LED) driving apparatus and an LED driving method suitable for driving an LED load are provided. The LED driving apparatus includes a driving circuit, a feedback circuit, and a control chip. The driving circuit provides a driving voltage to one terminal of the LED load according to a pulse-width modulation (PWM) driving signal. The feedback circuit generates a feedback voltage according to a voltage on the other terminal of the LED load. The control chip is configured to generate the PWM driving signal and adjust the duty cycle of the PWM driving signal in response to the feedback voltage. If the control chip determines the PWM driving signal with a threshold duty cycle continues being output over a preset period of time, the control chip determines that the current leakage phenomenon occurs on the LED load and stops generating the PWM driving signal.

Abstract: Short circuit failures and open circuit failures of light-emitting elements used for the backlight in an LCD panel can be reliably and easily detected. The voltage at the node between each series-connected light-emitting element array and a drive circuit is detected as a monitored voltage. A maximum detector detects the highest and a minimum detector detects the lowest of these monitored voltages. Short circuit or open circuit failure of a light-emitting element is detected by comparing the voltage difference between the maximum detector output and the minimum detector output with a specific reference voltage.

Abstract: To allow a direct connection of a light source to a 230V/50 Hz or 120V/60 Hz AC network and to ensure safe operation and easy adaptation to user requirements when mounting, the light source includes a series connection which is connected to a bridge rectifier (GL) and includes at least two LED arrays strands, which have several interconnected individual LEDs, and a pre-resistor, which are arranged on a plate-like, electrically contacting carrier that dissipates heat, has protection against contact and carries the at least two array-LED-strands. For direct operation in an AC voltage supply, the sum of the flow voltages of the LED arrays (U1 . . . Un) is dimensioned such that it is equivalent to at least 75%, preferably 80% and a maximum of 85% of the amplitude of the rectified AC voltage at the nominal voltage, and that the array-LED-strand will be conductive if crossing the sum of flow voltages.

Abstract: An LED control circuit designed for providing stable voltage to LED loads, which is comprised of a bridge rectifier connected with the power supply, at least one LED branch circuit comprised of LED control units in series connection with a current-regulating element. Each LED control unit is comprised of a zener diode parallelly connected with LED working elements made of an LED and a serially connected current limiting resistor. The forward voltage drop of the zener diode closely approximates the desired working voltage of the LED loads, and thus each LED control unit plays the role of a voltage regulator. When voltage of an LED control unit is below the stabilized voltage of the zener diode, the brightness of LED is continuously adjustable. When an LED branch circuit is put under the control of a constant current control module, the current flowing through each LED can be stabilized.

Abstract: The present invention discloses an LED backlight system and a display device. The LED backlight system includes an LED display module and an LED backlight control circuit. The LED display module includes LED string. The LED backlight control circuit includes a current module, a comparison unit, a control switch unit, and an impedance unit wherein, an input terminal of the comparison unit obtains a voltage at a negative terminal of the LED string, and when the voltage at the negative terminal is greater than a preset threshold voltage, the comparison unit controls the control switch unit to turn on such that the impedance unit connects in parallel with the current module so as to decrease the voltage at the negative terminal. Through above way, the present invention can prevent the unstability of the circuit loop in order to prevent the flicker phenomenon of the backlight system.

Abstract: The invention is directed to the provision of an LED driving circuit that switches the connection of LED blocks with proper timing in accordance with the supply voltage and the Vf's specific to individual LEDs contained in each LED block.

Abstract: A high power lighting fixture which includes a first multiple of first light emitting diodes (LEDs) mounted and series connected to form a first serial string of LEDs on a first circuit board. A second multiple of second light emitting diodes (LEDs) mounted and series connected to form a second serial string of LEDs on a second circuit board. Mating circuit board connectors are mounted on the first and second circuit boards. The first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs are selected so that the lighting fixture is operable at a minimum electrical power rating of 100 Watts. A control signal is received which determines current division between the first and second LEDs.

Abstract: Recently, there has been a growing emphasis on the importance of green industries for reducing energy consumption. As part of the reduction in energy consumption, LED lamps have been widely distributed and used, but conventional fluorescent lamps made of glass tubes have not been actively replaced with LED fluorescent lamps because the replacement of conventional fluorescent lamps is too difficult, for instance, in order to replace the conventional fluorescent lamps with LED fluorescent lamps, a conventional fluorescent lamp stabilizer provided within the light of the fluorescent lamp has to be removed and an LED converter must be installed again.

Abstract: A light-emitting device includes a first light-emitting element and a second light-emitting element. The first light-emitting element has a first LED, and emits a first spectrum. The second light-emitting element has a second LED and a constant voltage element connected in series, and emits a second spectrum different from the first spectrum. The second light-emitting element is connected in parallel to the first light-emitting element. First light-emitting element and the second light-emitting element are configured such that their lines indicating the forward current-forward voltage characteristics cross each other. This enables to change spectral distribution emitted from the light-emitting device just by changing power supplied from a single power circuit.

Abstract: An embodiment of the disclosure relates to a voltage converter for supplying a semiconductor light source and having at least an input terminal connected to a power supply reference, namely an AC mains voltage reference, and an output terminal providing a current signal to said semiconductor light source, the converter being also connected to a voltage reference and comprising at least a step-down block inserted between a switching node and to the output terminal and connected to the voltage reference and an input block connected to the input terminal, as well as to a first input node and to a first output node of a control circuit, in turn connected to the switching node and to the voltage reference.

Abstract: A combination lamp for use in a vehicle includes a number of reflector modules, with each reflector module including a reflector, a first light emitting diode (“LED”) positioned at a focus of the reflector, and a second LED offset from the focus of the reflector. The lamp may also include another reflector module having a reflector and a single, common LED positioned at a focus of the reflector. When the first LEDs and the common LED are energized, the combination lamp produces a first light pattern. When the second LEDs and the common LED are energized, the combination lamp produces a second light pattern. The first light pattern may be a fog lamp light pattern, and the second light pattern may be a daytime running lamp light pattern. The combination lamp may include four, five, or more reflector modules, including the one reflector module having the single, common LED.

Abstract: A light emitting diode control circuit with carrier signal control includes a signal coupling unit, an operational amplifier, a demodulation unit, an identification and control logic unit, a counting and shift-registering unit, a data register, an output register, at least a current output unit, an address encoding unit, an address register, a voltage regulator and an oscillator. The efficiency of the present invention is to reduce the transmission lines of the light emitting diode lamp. Therefore, the cost of the light emitting diode lamp is reducing.

Abstract: A driver is connectable to an external power supply and configured to output variable electrical power for one or more loads, such as LEDs. A module including a microcontroller is operable to output a control signal that automatically varies the electrical power outputted by the driver. The microcontroller is further configured to be powered by the control signal.