182 results about "Led driver" patented technology

The disclosed device relates to a multiple lighting mode LED lamp. The lamp has an LED assembly with a plurality of white LEDs for a first illumination source, and a plurality of UV LEDs for a second illumination source. The LED assembly is attached to the first end of a flexible support, and a base is attached to the second end of the flexible support. The lamp base incorporates an LED driver module in electrical communication with the illumination sources. A manual touch switch in the base, when touched by a user activates the white LEDs to operate the lamp in a lighting mode. A motion sensor in the form of an infrared induction sensor, is incorporated into the face of the LED assembly for detecting motion. Upon motion being detected, the UV LEDs are activated for a predetermined period of time to operate in UV light mode.

An LED driver configured to control a LED fixture comprising a plurality of LED groups is described, each LED group comprising at least one LED forming a series connection with a switch, wherein the plurality of LED groups are arranged in a parallel connection, the LED fixture further comprising a capacitor arranged in a parallel connection to the plurality of LED groups, the LED driver comprising:a power converter for converting an input power from a power source to a current which is provided to the plurality of LED groups;a control unit configured to control the power converter to provide the current to the plurality of LED groups, and wherein the control unit is further configured tocontrol an operation mode of the switch of the LED group between a nominal mode, wherein the switch operates in a closed nominal state or an open nominal state, anda transition mode, wherein the switch operates in a semi-closed state, wherein a gate to source voltage of the switch of the LED group is lower than the gate to source voltage of the respective switch when operated in the nominal mode,switch the current from flowing through a first LED group to flowing through a second LED group, wherein the first LED group has a higher forward voltage than the second LED group, by switching the switch of the first LED group in the open nominal state and the switch of the second LED group in the semi-closed state during a transient period.

A bidirectional colorful light triggered by power-line pulse signals connected in series and parallel includes a bidirectional luminous light string triggered by power-line pulse signals, a first controllable switch, a second controllable switch, a third controllable switch, and a fourth controllable switch. The bidirectional luminous light string triggered by power-line pulse signals comprises a plurality of bidirectional light sources, which comprises a light module triggered by power-line pulse signals and a reverse light module. The light module triggered by power-line pulse signals comprises an LED colorful light group and an LED driver that drives the LED colorful light group based on power-line pulse signals loaded on power lines of the bidirectional luminous light string triggered by power-line pulse signals. This invention achieves a bidirectional colorful light driven by power-line pulse signals through the control of the second and fourth controllable switches, simplifying the control circuit.

This utility model discloses a lighting control system with dual working modes, including a lighting control circuit and a power supply switching circuit. The lighting control circuit includes a time-delay switch, a light-controlled switch, an LED driver, a first live wire terminal, a second live wire terminal, and a neutral wire terminal. The power supply switching circuit includes a circuit breaker, a contactor, and a time controller. The circuit breaker is connected sequentially to the first live wire terminal, the time-delay switch, the light-controlled switch, and the LED driver. The time controller is connected to the control coil of the contactor. One end of the normally open contact of the contactor is connected to the circuit breaker, and the other end is connected to the second live wire terminal. The second live wire terminal is connected sequentially to the light-controlled switch and the LED driver. One end of the neutral wire terminal is connected to the neutral wire, and the other end is connected to the LED driver. This utility model solves the problem that traditional single-mode lighting fixtures cannot adapt to complex scene requirements by setting dual live wire terminals and a power supply switching circuit, thus improving the flexibility and adaptability of lighting control.

This utility model relates to the field of plant cultivation technology, specifically disclosing a household plant cultivation supplementary lighting device. It includes a planting box with a frame on the box, and a supplementary light emitting light towards the planting box on the frame. The supplementary light includes a regulated power supply circuit, an LED driver circuit, a light source board circuit, a main control circuit, a dimming button circuit, a timer button circuit, and a button backlight circuit. The main control circuit is electrically connected to the regulated power supply circuit, LED driver circuit, dimming button circuit, timer button circuit, and button backlight circuit. The LED driver circuit is electrically connected to the light source board circuit. This utility model adjusts the light emission state of the light source board circuit by setting up dimming and timer button circuits, achieving functions such as brightness adjustment and timed lighting, thereby meeting the light needs of plants at various stages of growth, offering diverse functions.

A lighting device including an LED light source, wherein the LED light source includes a first LED strand for generating a first light with a first correlated color temperature and a second LED strand for generating a second light with a second color temperature different from the first color temperature. The lighting device further comprises control electronics with a controllable LED driver for driving the LED light source, wherein the control electronics comprise a switch for switching between the first LED strand and the second LED strand so that either the first LED strand or the second LED strand is activated depending on the switch position. A lighting system comprising the lighting device is further disclosed.

The invention discloses a multichannel LED digital control system and method. The system comprises a main controller which generates an LED control instruction and sends a data frame through a differential bus; the plurality of LED driving modules are connected with the main controller through a differential bus, and each LED driving module comprises a differential receiver for receiving a differential signal of the differential bus; the UART communication module is connected with the differential receiver and converts the differential signal into serial data; the data processing state machine module is connected with the UART communication module and is used for analyzing the received data frame, and the data frame comprises a synchronous byte, a device address / command composite byte, a register address byte, a data byte and a CRC (Cyclic Redundancy Check) check byte; the digital logic counter is used for measuring the bit width of each data bit in the synchronous bytes and calibrating the sampling time sequence of the UART communication module based on a measurement result; the register group is used for storing LED control parameters; and the multi-path PWM generator is connected with the register block and generates multi-path PWM signals according to the LED control parameters so as to drive the LEDs. The power consumption is reduced.

The invention provides a backlight LED driving circuit, a driving chip and a driving system. The circuit comprises a demagnetization detection module, a sampling detection module, a PWM dimming module, an error amplification module, a trough locking module and a logic driving module, and the demagnetization detection module receives a power switch tube drain resonance voltage signal in a peripheral circuit as a demagnetization feedback signal and generates a trough detection signal at the trough moment of the drain resonance voltage signal. The sampling detection module receives the sampling voltage and outputs a detection voltage. The PWM dimming module outputs a reference voltage according to the PWM dimming signal. The error amplification module outputs an error voltage according to the detection voltage and the reference voltage. The trough locking module determines the locking trough number according to the error voltage, counts the current trough number according to the trough detection signal, and outputs a conduction control signal if the current trough number is equal to the locking trough number. And the logic driving module outputs a driving signal according to the conduction control signal so as to control the conduction of the power switch tube.

The present disclosure relates to hybrid pulse amplitude and width modulation in LED drivers for display panels. Driving an array of LEDs includes determining a total charge to be transferred to the LEDs during an image frame, and determining a number of drive pulses of equal width and equal amplitude to drive the LEDs at close to the total charge during display of the image frame. One of the drive pulses is modified so that the drive pulse drives the LEDs at the total charge during the display. If the width is greater than a minimum width and less than a maximum width, the LED is driven with the drive pulse. If the width is less than the minimum width and if the amplitude is greater than a minimum amplitude, the amplitude of the drive pulse is reduced. If the width is less than the minimum width, and if the amplitude is equal to the minimum amplitude, and if the number of drive pulses is greater than one, the number is reduced.

A lighting control system for controlling a cumulative light emitted by a lighting fixture having a plurality of LED light sources may comprise a plurality of LED drivers adapted to be coupled to a respective one of the LED light sources and configured to control an intensity of the respective LED light source, and a controller configured to transmit a single digital message for controlling the cumulative light emitted by the lighting fixture. Each of the plurality of LED drivers is configured to adjust the intensity of the respective LED light source to a preset intensity in response to the single digital message transmitted by the controller.

The present disclosure relates to: a display device with which miniaturization and cost reduction of an LED driver can be achieved; a method for operating a display device; and a backlight. In the present invention, reduction in manufacturing cost and device size of an LED driver is achieved by performing time division multiplexing on a light-emitting synchronization signal provided to a plurality of light-emitting diode (LED) drivers and a data signal (such as a duty cycle or a light-emitting delay time) to be used for light-emitting control of LEDs mounted on the LED drivers; an integrated wiring to connect the plurality of LED drivers in a daisy chain, thereby forming a single-layer wiring; and two terminals for transmission and reception, which are dedicated to reducing the light-emitting synchronization signal. The present invention can be applied to a display device using an LED backlight.

A method of wireless configuring an LED driver is described. The LED driver comprises a power converter for powering an LED fixture, a BLE transceiver and an on-board power supply for powering the BLE transceiver, and a control unit for controlling the power converter and / or the LED fixture. The method comprising the steps of: transmitting a configuration signal representative of configuration data for the LED driver from an user interface to the BLE transceiver of the LED driver, generating configuration data for the LED driver based on the configuration signal, and configuring the LED driver according to the configuration data.

This utility model provides a transformer for LED driver power supplies, relating to the field of LED driver power supply transformers. It includes a protective cover, which is inserted into the top of a mounting base. The top component can be stably installed on the top of the mounting base for use, ensuring a stable power supply to the LED and stable operation. The top component is installed sequentially and locked all at once, simplifying the installation and removal process on the mounting base. It eliminates the need for screws, greatly improving the efficiency of installation and removal during maintenance. This solves the problem that in existing LED driver power supply transformers, the circuit board and casing are separately mounted to the base with screws. This necessitates disassembling the casing and circuit board one by one during maintenance, requiring numerous screws, cumbersome steps, and the risk of loss if the removed screws are not properly stored.

This invention discloses an intelligent LED driver power supply and lighting control method. The driver power supply includes a main power circuit, an intelligent control module, a dimming module, a protection module, an NFC programming module, and a communication module. The intelligent control module selects the dimming mode according to DALI priority rules and smoothly adjusts the output current in gradients not exceeding 1% of the current value each time, solving the flickering problem during dimming switching. It activates gradient derating protection when there is external over-temperature, and selectively executes self-recovery or non-self-recovery protection based on the version identifier when there is internal over-temperature, forming a graded temperature protection mechanism. Protection events are stored as fault logs and read via the NFC module. This invention integrates dimming priority determination and smooth transition logic into the same control core, and associates graded temperature protection with fault log storage to form an integrated protection, recording, and diagnostic link, achieving flicker-free dimming, refined protection, and efficient operation and maintenance.

Disclosed herein are system, apparatus, article of manufacture, method and / or computer program product embodiments, and / or combinations and sub-combinations thereof, for controlling a backlight apparatus in a media device with driver ICs. In some embodiments, the media device can include a display screen and the backlight apparatus. In some embodiments, the backlight apparatus can include first and second LEDs in a first horizontal zone and third and fourth LEDs in a second horizontal zone. The backlight apparatus can include a first driver IC connected to the first and third LEDs and configured to turn on the first LED during a first time period and the third LED during a second time period. The backlight apparatus can include a second driver IC connected to the second and fourth LEDs and configured to turn on the second LED during the first time period and the fourth LED during the second time period.

The invention relates to a two-stage converter circuit comprising a first stage that is configured to provide power factor correction and a second stage that is configured to provide electric isolation and fixed voltage-to-voltage conversion. The converter circuit is configured to fulfil input requirements (e.g., total harmonic distortion (THD), power factor (PF) etc.) and apply isolation by means of a self-oscillating converter. Thereby efficiency can be improved and costs reduced for LED drivers or other driver circuits that require an isolated output.

This invention belongs to the field of artificial intelligence and digital data processing technology, and relates to a method and system for predicting the lifetime of LED driver circuits based on machine learning. The method includes: acquiring the ambient temperature, operating voltage, and current sequences of the circuit board containing the core components of the LED driver circuit; extracting the time features of the temperature sequences to determine the cumulative value of dynamic temperature fluctuations; determining a dynamic thermal time constant correction factor based on the cumulative value; reconstructing the temperature sequence according to the correction factor to determine a virtual core temperature condition variable; and inputting the voltage and current sequences as the main input and the virtual core temperature as the condition variable into a pre-trained conditional variational autoencoder to output the remaining lifetime prediction result. This invention can more accurately assess the cumulative effect of ambient temperature fluctuations, scientifically correct the influence of thermal inertia reflected in the heat conduction process, effectively solve the problem of feature decoupling distortion, improve the accuracy and reliability of LED driver circuit lifetime prediction, reduce the risk of unexpected failures, and ensure stable circuit operation.

We provide LED strings, LED panels, and LED display screens. [Solution] The first signal input port and the second signal output port of the LED light bead are directly electrically connected, forming a first breakpoint transmission restart line, thereby ensuring that data signals can be transmitted to the next LED light bead even if a failure occurs in the LED driver chip. The second signal output port and the second signal input port are electrically connected between the first LED light bead and the second LED light bead, which are separated by at least two LED light beads, forming a second breakpoint transmission restart line, thereby enabling the transmission of data signals to the second LED light bead and subsequent LED light beads even if failures occur in a series of LED light beads. Furthermore, energy consumption is saved by adopting a serial power supply method.

1. Name of the product in this design: Circuit board (LED driver power supply circuit board 3). 2. Purpose of this design: This design is intended to be used as a circuit board for driving power supplies for LED lamps. 3. The key design features of this product are: the overall shape of the circuit board, the layout of each component on the circuit board, and the wiring method of the connecting lines between the components on the circuit board. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

1. Name of the designed product: LED driver. 2. Use of the designed product: driver for LED lamp. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

An emergency power supply capable of turning off a sensor in an emergency lighting mode is used for transmitting a current to an LED driver when mains power is cut off. The LED driver is connected to the mains power. After receiving a current input by the mains power, the LED driver converts the current into a direct current and outputs the direct current to an LED light. When the mains power is normal, the emergency power supply supplies power to the sensor. When the mains power is cut off, the emergency power supply stops supplying power to the sensor. Compared with the prior art, the emergency power supply cannot supply power to the sensor in an emergency lighting mode, and the sensor will be turned off, thus guaranteeing the safety of users in an emergency.

A method of controlling a cluster of micro-LEDs within a larger matrix of micro-LEDs may comprise receiving a reference current at a current-to-voltage converter circuit and generating a reference voltage based on the reference current. The method may also comprise receiving the reference current at N×M micro-LED driver circuits and generating regulated currents for each of N×M micro-LEDs, wherein M and N represent positive integers.

The invention relates to an emergency LED driver (100) for supplying an LED load (300), comprising a mains connection (101) for receiving a mains voltage; an output port (105) configured to forward a driver supply voltage based on the mains voltage to an external driver (200); an input port (107) configured to receive an LED supply voltage from the external driver (200); an LED connection (113) for connecting the LED load (300) to the emergency LED driver (100); and a load side relay (111). In a non-emergency mode, the load side relay (111) is adapted to electrically connect the LED connection (113) with the input port (107) such that the LED supply voltage received at the input port (107) is forwarded to the connected LED load (300). Upon a mains voltage failure, the load side relay (111) is configured to maintain the connection between the LED connection (113) and the input port (107) for a predetermined delay time and, after the delay time has passed, to disconnect the input port (107) from the LED connection (113) and to switch the voltage supply of the LED load (300) to a battery (110).

The utility model provides a high-power LED light source driving circuit, which comprises a direct-current power supply, an LED driver, a charging control circuit, a current sampling resistor, a capacitor bank and a discharging control circuit, a direct-current power supply is input to the LED driver, and the LED driver is connected with the current sampling resistor and the capacitor bank in series. The capacitor bank is connected with the anode of the LED light source; the charging control circuit comprises a voltage division circuit I and a voltage comparator I, and the voltage division circuit I samples the voltage output by the LED driver; the voltage comparator I is connected with the LED driver; the LED driver judges whether the capacitor bank is charged or not; the discharge control circuit comprises a controller and a switching device, the switching device is connected to the controller, and the controller controls on and off of the switching device; when the switching device is switched on, the capacitor bank releases electricity to the light source, and the light source is turned on; large current is provided for the light source through energy storage of the capacitor bank, smooth starting of the large-power light source is guaranteed, and the problems of power consumption increase and transmission cable heating are avoided.

This invention provides a triac-controlled LED driver control circuit, relating to the field of circuit technology. The circuit includes a circuit board with a microcontroller mounted on its top surface. One end of the microcontroller is electrically connected to a resistor dimmer via a power line, another end is electrically connected to a rectifier via a power line, and yet another end is electrically connected to an optocoupler via a power line. Several sets of resistive elements are arranged on the surface of the circuit board. In use, this invention enables dimming via three input signals: triac dimming, 0 / 1~10V dimming, and resistor dimmer dimming. These three dimming input signal voltage changes are converted into an output PWM signal pulse width by the microcontroller to control the turn-on time of the low-voltage MOS transistor Q3. The dimming process does not affect the normal operation of the driver power supply system, thus avoiding issues with flickering and dimming depth.

The utility model provides a drive control circuit and an LED driver. The driving control circuit is used for controlling the LED driver and comprises a chopping signal control circuit and a driving signal generation circuit. The input end of the chopping signal control circuit is used for being coupled with a dimming signal end, and the output end of the chopping signal control circuit outputs a chopping signal. The driving signal generation circuit comprises a delay control circuit, a brightness judgment circuit and a constant current driving circuit. The first input end of the brightness judgment circuit is coupled with the output end of the chopping signal control circuit, and the second input end of the brightness judgment circuit is coupled with a preset signal end to obtain a preset value. The input end of the delay control circuit is respectively coupled with the output end of the brightness judgment circuit and the output end of the chopping signal control circuit. The input end of the constant current driving circuit is coupled with the output end of the chopping signal control circuit. The drive control circuit and the LED driver provided by the utility model can solve the stroboflash problem and ensure the dimming resolution at the same time.

The application discloses a calibration matching method for atmosphere lamp user color, and belongs to the field of atmosphere lamp production technology.The method comprises the following steps: installing K PCBA boards on a lamp shell;measuring color coordinate values and luminous flux values of the atmosphere lamps;taking the color coordinate values and luminous flux values of any atmosphere lamp as calibration data, and calculating a pwm duty cycle;a controller controls a LED driver to drive the K atmosphere lamps to complete primary calibration;removing the PCBA board in any atmosphere lamp, and measuring the actual luminous flux value;comparing the actual luminous flux value with a target luminous flux value to obtain a ratio r;increasing the target luminous flux value Y_t by r times, combining the calibration data, and calculating a pwm target duty cycle;a controller controls a LED driver to drive the K atmosphere lamps to complete secondary calibration;measuring the color coordinate values and luminous flux values of the atmosphere lamps after calibration, and comparing the values with customer standards.The method realizes assembly user color adjustment of multiple styles of atmosphere lamps, meets the matching degree of the colorimetric value control of the atmosphere lamps and the real environment demand, greatly saves production time cost, and improves production efficiency.

An evaporator unit for an air conditioning system 1, the unit comprising an evaporator coil 7, a sensor 12 for detecting the liquid level in a reservoir, and a pump for pumping condensate from the housing; at least one UV LED 6, 8 is arranged to radiate light onto the evaporator coil 7 and / or the sensor 12; an LED driver 13 supplies electrical power to the LEDs; an individual electrical power connection 14 can be connected to a main power source to supply main power to the pump; wherein the LED driver 13 is connected to the electrical power connection that supplies power to the pump.

A lamp includes a single 1-layer metal core printed circuit board (PCB). The 1-layer metal core PCB includes a plurality of light emitting diodes (LEDs), an LED driver circuit, a microcontroller unit (MCU) providing wireless connectivity and control for the LED driver circuit, and a power supply circuit providing power for the LEDs and the MCU. The lamp includes an antenna, e.g., helical or monopole, mounted on the single 1-layer metal core PCB. Capacitor(s) and / or inductor(s) may be mounted on a bottom side of the 1-layer metal core PCB opposite a top side of the 1-layer metal core PCB on which the LEDs are mounted. The lamp is line powered. The LEDs are disposed on a periphery of a top side of the PCB and the MCU and other circuitry is disposed on the top side of the PCB inside of the periphery.