309 results about "Led driver" patented technology

A multi-layer display including an upper substrate including light emitting diodes (LEDs) fabricated on a topside of the upper substrate, and LED bonding pads fabricated on a bottomside of the upper substrate. The LED bonding pads being electrically connected to the LEDs through vias extending through the upper substrate. The display also including a lower substrate including LED driver circuits and driver bonding pads fabricated on a topside of the lower substrate. The driver bonding pads being electrically connected to the LED driver circuits, where the LED bonding pads and driver bonding pads are aligned and electrically connected to each other, thereby electrically connecting the LED driver circuits to the LEDs.

Disclosed is an LED driver circuit, a multi-wire communication device and a method for an LED display system. The device comprises a controller providing at least one of a configuration data packet, a brightness data packet, and a display data packet; the LED driver circuits, wherein the LED driver circuits are cascaded to provide a first data channel using first data ports and second data ports, the LED driver circuits are connected in parallel to provide a second data channel using third data ports. The device relays an enable signal or an address data packet stage by stage using the first data channel, transmit at least one of the configuration data packet, the brightness data packet and the display data packet in parallel using the second data channel. The number of the cascaded LED driver circuits can be infinite, the number of data wires is reduced, data rate is increased.

A light-emitting diode (LED) control unit includes: a pulse generator configured to generate a pulse signal; a T-filter configured to convert the pulse signal into a triangular wave signal; a first gate driver configured to receive the triangular wave signal and output a first gate control signal; a second gate driver configured to receive the first gate control signal and output a second gate control signal; a first switch configured to turn on a first LED string corresponding to a first color temperature based on the first gate control signal; a second switch configured to turn on a second LED string corresponding to a second color temperature based on the second gate control signal; and a power supply circuit configured to supply a power supply voltage to the pulse generator, the first gate driver, and the second gate driver by stepping down an operating voltage of the LED driver.

A light-emitting-diode driver structure applicable to driving a display panel and operation method thereof are provided. The LED driver structure includes at least one LED driving group, and the LED driving group is composed of a plurality of LED driving circuits which are serially connected in cascade. Each LED driving circuit of the LED driving group receives a data input signal in common. Upon receiving control signals, output signals are generated to drive the display panel. The multi-point driving circuit scheme can be fully or partially applied in the driver structure as required. In addition, a plurality of enable signals can be further adopted to activate each LED driving circuit, for avoiding the FIFO register used in the prior arts. By employing the disclosed technical contents, the present invention is effective in reducing both redundant power waste and circuit layout area of a conventional LED driver.

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 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.

A light-emitting diode (LED) supply voltage system for adjusting an LED supply voltage can include an LED supply voltage control circuit. The LED supply voltage control circuit can include a first comparator, which can be configured to compare a headroom voltage of a current-sinking LED driver, such as measured between a current-sinking LED driver node and a reference potential node, to a first threshold value and can generate a first comparator output as a result of the comparison. The LED supply voltage system can also include an LED supply voltage control circuit, which can include comparator processing circuitry, which can be configured to receive the first comparator output and generate a feedback signal to a power converter based on the received first comparator output. This can include to recurrently, adjust the feedback signal such that the power converter reduces the LED supply voltage by a specified voltage decrement value when the first comparator output indicates that the headroom voltage can be above the first threshold value.

The invention relates to the technical field of automobile lamps, in particular to an automobile lamp function fault intelligent compensation circuit structure which comprises a microprocessor (1), an LED driver (2), a current limiting resistor (3), an LED lamp (4), a thermistor (5), an MOS tube (6) and a precise sampling resistor (7), and discloses an automobile lamp function fault intelligent compensation circuit control method which comprises state sensing, intelligent decision making and dynamic execution. The method is novel in conception, scientific in design and safe and reliable to use, and intelligently improves the driving power of the remaining normal LED lamps (4) after the fault of the LED lamps (4) is recognized by monitoring the branch states of the LEDs (4) in real time, so that the total light output is maintained to be close to the initial level, and the driving safety and the regulation conformity are guaranteed.

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.

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.

A bidirectional illuminated LED bead triggered by power line pulse signals includes a first illumination module trigged by power line pulse signals and a reverse light emitting module. The first illumination module trigged by power line pulse signals and the reverse light emitting module are connected in parallel to the first power line port and the second power line port of the light source. The first illumination module trigged by power line pulse signals includes an LED color light group and an LED driver. When the voltage level at the first power line port is higher than the voltage level at the second power line port, the LED driver drives the LED color light group. Conversely, the reverse light emitting module works. The LED driver includes a reverse current blocking module and an operation module triggered by power line pulses integrated in a same integrated circuit.

To provide an LED device and a liquid crystal display device in which power consumption is suppressed.SOLUTION: The LED device 101 includes a plurality of LED light sources 20, an LED driver 12 connected to one end of each of the plurality of LED light sources and controlling a current flowing through each LED light source based on lighting data, a DC power supply 54 having an output terminal connected in parallel to the other end of each of the plurality of LED light sources using a wiring, receiving a control signal, and applying an LED voltage having a value based on the control signal to the output terminal, and a control device 55 receiving display data, generating lighting data and a control signal based on the display data, and outputting the lighting data and the control signal to the LED driver and the DC power supply.SELECTED DRAWING: Figure 2

A circuit for driving a plurality of LEDs includes a plurality of channels, wherein each channel has an enable input and is configured to regulate—when enabled—a load current flowing from an output node to a sense node of the respective channel. The current regulation is based on a reference voltage and a sense voltage present at the sense node of the respective channel. The circuit further includes a main sense resistor connected to the sense node of a first channel of the channels and one or more additional sense resistors, wherein the sense node of each channel is connected to a sense node of a neighboring channel via one of the additional sense resistors. A chain of LEDs is coupled to the circuit, and the output node of each channel is connected to an output node of a neighboring channel via at least one LED of the chain of LEDs and wherein an input node is connected to the output node of a last channel of the channels via at least one LED of the chain of LEDs. Moreover, the circuit includes an analog delay circuit including a capacitor connected to the enable input of the first channel, wherein the enable input of each channel is connected to the enable input of a neighboring channel via a resistor and wherein the enable input of the last channel is coupled to a voltage source configured to provide a voltage based on the voltage present at the input node.

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.

According to the double-line cascaded LED driving circuit and the communication method thereof provided by the invention, two lines, namely the clock line and the data line, are adopted, and data communication and connection between LED drivers are realized through a communication mode of two-line input and two-line output; meanwhile, the forwarding identification in the input data is obtained through the arranged data cascade circuit in the LED driver, and the clock signal and the data corresponding to the forwarding identification are used as the input driving data of the LED driver of the next level based on the forwarding identification, so that the LED driver of the whole driving unit only needs to drive one LED driver, and the driving efficiency is improved. Therefore, high-speed data transmission can be realized, and meanwhile, the wiring mode between the controller and the LED drivers and the wiring mode between the LED drivers are simplified, and the hardware wiring difficulty is lowered.

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.