618 results about "Led driver" patented technology

The invention relates to the technical field of intelligent dimming control, and discloses an intelligent dimming control method and system based on an LED driver, and the method comprises the steps: carrying out the current and light intensity data collection of the LED driver under different dimming depth values, and obtaining a response characteristic data set; inputting the response characteristic data set into a convolutional block attention module and convolutional neural network combined architecture for training to obtain an LED response characteristic prediction model; the ratio of the light intensity change rate to the current change rate is calculated, and a piecewise linear dimming sensitivity index is obtained through piecewise linear function fitting; constructing a first-order inertia controller and a brightness feedback loop, and generating a brightness self-compensation control strategy; according to the LED driver, the brightness change response is predicted, and the PWM dimming control signal is generated according to the trajectory smoothing algorithm and the PID controller, so that the adaptive capacity of the LED driver to external interference and parameter change is enhanced, and the stability and reliability of the LED driver are improved.

The invention relates to the technical field of chip testing, and discloses an LED driving chip testing method, device and equipment and a storage medium, and the method comprises the steps: carrying out the multi-point temperature excitation and constant-current output synchronous collection of an LED driving chip, and obtaining electrothermal coupling test data; performing thermal resistance network decomposition on the temperature field in the chip to obtain temperature distribution characteristic parameters; performing nonlinear function fitting on the temperature-constant current coupling relation to obtain an electrothermal coupling transfer coefficient; performing four-dimensional coupling calculation on the temperature distribution characteristic parameter and the electrothermal coupling transfer coefficient to obtain four-dimensional coupling response characteristic data; and partial differential sensitivity calculation is carried out based on the four-dimensional coupling response characteristic data, and an electrothermal coupling sensitivity analysis result is obtained.According to the method, the problem of test errors caused by time desynchrony in a traditional separated temperature-current test is solved, quantitative sensitivity analysis of electrothermal coupling parameters is achieved, and the sensitivity of the electrothermal coupling parameters is improved. Therefore, the test accuracy of the LED driving chip is improved.

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.

The invention discloses an atmosphere lamp user color calibration matching method. The method comprises the steps that K PCBA boards are installed on a lamp shell; measuring a color coordinate value and a luminous flux value of the atmosphere lamp; the color coordinate value and the luminous flux value of any atmosphere lamp serve as color correction data, and the pwm duty ratio is calculated; the controller controls the LED driver to drive the K atmosphere lamps to complete primary color correction; the PCBA board in any atmosphere lamp is taken out, and the actually measured luminous flux value of the PCBA board is measured; comparing the actually measured luminous flux value with a target luminous flux value to obtain a ratio r; increasing the target luminous flux value Yt by r times, and calculating a pwm target duty ratio in combination with color correction data; the controller controls the LED driver to drive the K atmosphere lamps to complete secondary color correction; and the color coordinate value and the luminous flux value of the atmosphere lamp after color correction are measured and compared with customer standards. The method has the advantages that assembly user color adjustment of multiple styles of atmosphere lamps is achieved, the matching degree of chromatic value control of the atmosphere lamps and real environment requirements is met, the production time cost is greatly saved, and the production efficiency is improved.

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.

The present invention provides a channel current calibration circuit for an LED driver chip and an LED driver chip, comprising: a calibration voltage generation module and multiple channel calibration selection modules. The calibration voltage generation module is configured to receive a first reference voltage generated by a reference voltage generation module and adjust the first reference voltage according to a preset voltage difference to obtain multiple calibration voltages, wherein the voltage difference between adjacent calibration voltages is the preset voltage difference. The channel calibration selection module is configured to receive the multiple calibration voltages and select a target calibration voltage from the multiple calibration voltages according to a first control signal from a digital controller, thereby calibrating the output current of the channel current generation module to a desired current value using the target calibration voltage. After the calibration voltage generation module adjusts the reference voltage to multiple calibration voltages, each channel calibration selection module selects the corresponding target calibration voltage to adjust the output current of the corresponding channel current generation module to the desired value.

The utility model provides a test system for Mini LED drive chips, which is applied to the technical field of liquid crystal display and specifically comprises a host, an FPGA (field programmable gate array) master control module, a plurality of Mini LED drive chips, a plurality of cement resistors and a plurality of LED lamp beads with the same number as the cement resistors, then, through a mode of adding a cement resistor and an LED lamp bead in each channel of each Mini LED driving chip, the test requirement difference of different clients is considered on the test system, and through a mode of further adding an FPGA main control module, an automatic return circuit mechanism is added in the test system; wherein the host is in communication connection with the FP GA main control module through one path of UART bus so as to send a test signal to the FPGA main control module or receive the running state of each Mini LED driving chip returned by the FPGA main control module in real time, so that high-temperature and high-humidity accurate test and automatic recording of test results are realized, manpower and material resources are saved, and the test efficiency is improved.

The invention provides a three-in-one dimming device for an LED driver and a dimming method of the three-in-one dimming device. The LED driver with a single dimming mode can be upgraded into the LED driver with multiple dimming modes of 0-10V analog signal dimming, DALI dimming and DMX dimming at low cost. The analog dimming circuit, the DMX transceiver circuit and the DALI transceiver circuit are all connected with the single-chip microcomputer. The dimming interface I is respectively connected with the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit; the second dimming interface is connected with the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit, and is connected with the grounding port through the on-off circuit. The on-off circuit is connected with the single-chip microcomputer. The interface protection circuit is also connected with the interface overvoltage detection circuit, the DMX transmit-receive circuit and the single-chip microcomputer. The interface overvoltage detection circuit is connected with the interface protection circuit, the first dimming interface and the second dimming interface.

The invention discloses a temperature-based LED color deviation compensation correction method. The method comprises the following steps: measuring LED lamp bead data by using a spectrograph and importing the data into a PC terminal; normal-temperature color coordinate values and normal-temperature luminous flux values of red, green and blue channels of the LED lamp beads collected at the normal temperature of 25 DEG C and the temperature t serve as independent variables at a PC end, data of the LED lamp beads are fitted into a multivariate high-order function through machine learning, and the multivariate high-order function is written into a program code of a controller; measuring primary color coordinate values and primary luminous flux values of red, green and blue channels of the LED lamp beads at 25 degrees once by using a spectrograph, and writing the primary color coordinate values and the primary luminous flux values into a controller; the controller obtains the current temperature value t ', and the actual color coordinate value and the actual luminous flux value of the LED lamp bead under the current temperature value t' are calculated; and calculating the target duty ratios of the red, green and blue channels of the LED lamp beads with the target color and writing the target duty ratios into an LED driver, wherein the LED driver drives the LED lamp beads to mix light with the same color as the target color. The production efficiency of the atmosphere lamp is improved, the production process is simplified, and the color cast compensation precision of the atmosphere lamp is improved.

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 multi-channel LED driver for driving an LED fixture, wherein the multi-channel LED driver comprising a plurality of output channels, wherein each output channel is connectable to an LED or LED string of the LED fixture, the multi-channel LED driver comprising:a plurality of power converters, each power converter being associated with an output channel of the plurality of output channels, wherein each power converter comprises a switch, and wherein each power converter converts an input power at an input terminal to a current at a respective output channel of the multi-channel LED driver,a comparator configured to compare a current signal representing the current measured at an output channel by a current measurement element with a reference signal representing a current set point for the output channel, and wherein the comparator generates an output signal to control the switch of the power converter associated with the output channel,a controller arranged to determine successive, for each of the plurality of power converters associated with the plurality of output channels, a duty cycle of the respective switch of the power converter during a measurement window and wherein the controller is further arranged to control the switch of the power converter outside the measurement window by:disabling the comparator to control the switch andproviding a duty cycle signal, representing the duty cycle of the switch as determined during the measurement window, to the switch of the power converter to control an operation of the switch.

A light-emitting diode (LED) control system includes a LED array composed of a plurality of LED channels each being composed of a plurality of LEDs; a plurality of LED drivers connected in sequence each being configured to drive a corresponding LED channel, the LED channels being controlled in sequence by the LED drivers; and a LED controller that sends brightness data to the LED drivers, which in turn control brightness of the LEDs. After brightness data input has been transferred to an associated LED driver, the brightness data input is then replaced with status data returned by the associated LED driver, and the replaced status data is finally read by the LED controller via other LED drivers.

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 invention discloses an LED drive board component welding device, which relates to the technical field of LED drive board production and comprises a base, a board body mounting unit, a welding drive unit and a gas pumping unit. The device is provided with a reliable plate body mounting unit, along with continuous movement of a clamping rod, a spring is compressed, and the inclined upper section of an elastic clamping block is continuously extruded to be in a horizontal state by a chamfer surface at the port of a clamping groove, so that after the LED driving plate is horizontally clamped in place, the LED driving plate is clamped and fixed from the upper side through bending of the elastic clamping block, and the working efficiency is improved. Therefore, the mounting tightness of the LED driving plate is effectively improved, and the stable proceeding of subsequent welding is ensured; a reliable welding driving unit is arranged, so that the welding gun can be driven to move flexibly, and the welding operation of each position is supported and completed; the inclined welding gun can bypass the pins of the components, welding is more facilitated, and the welding gun can be adjusted to rotate in the horizontal plane under the driving of the motor, so that a proper welding angle is found.

The invention provides a vehicle HUD PGU display driving system and method, and relates to the technical field of automobile intelligent cabin display. The system comprises a deserializer module which is used for receiving a serial signal input by an IVI end, deserializing an image signal in the serial signal into an image signal which can be received and displayed by an LED display module, deserializing local backlight original data in the image signal, and forwarding the local backlight original data to an MCU module; the MCU module is used for processing the local backlight original data through a preset lightweight decision algorithm and then generating a control signal; the LED driving module is used for controlling backlight partition lightening and brightness adjustment of the LED display module based on the LED lightening control signal and the LED brightness control signal; and the LED display module is used for performing partition display based on the control signal sent by the LED driving module. Backlight partition and even single-point lighting control are achieved, and the light window problem existing in an existing DLP, an existing LCOS and an existing common global dimming TFT-LCD PGU is solved.

To provide an LED driver and an LED lighting system, capable of reducing the discomfort of users.SOLUTION: An LED driver includes a DC-DC converter 11 and a strobe circuit 12. The strobe circuit generates a low-frequency modulation signal. The DC-DC converter is connected to the strobe circuit and provides an adjustable operating current to an LED light source according to a DC electrical signal and the low-frequency modulation signal. The operating current includes a DC current signal corresponding to the electrical DC signal and a low-frequency AC current signal corresponding to the low-frequency modulation signal. A frequency of the low-frequency AC current signal is 25-100 Hz, and a current ripple factor, equaling a difference of a maximum value and a minimum value of the operating current divided by a sum of the maximum value and the minimum value, is less than 8%.SELECTED DRAWING: Figure 3

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.

Embodiments of the present disclosure provide for a light emitting apparatus comprising a housing portion that is rotatably coupled to a base portion, wherein the housing portion is adjustable on two axes of rotation. In certain embodiments, the housing portion may be selectively disconnected from the base portion. The light emitting apparatus may comprise at least one LED operably engaged with at least one LED driver and a potentiometer to enable a selectively variable lumen output. In accordance with certain embodiments, the housing portion comprises at least one lens portion configured to enable one or more interchangeable / modifiable beam spread optics.

A lighting system including monitoring of input power and output power parameters to a set of lighting loads to detect power faults and / or anomalies. The set of sensing circuits include primary side and secondary side sensing circuits that communicate with a set of monitoring circuits to process the information supplied by the sensing circuits. If a fault and / or anomaly is sensed or detected, a signal is transmitted to provide an alert.

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.

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 provides an intelligent thermal management control system for a plant factory, which is characterized in that a target heat source is embedded in an interlayer space between a wall body and a roof of the plant factory by adopting external modularization, and is tightly attached to a heat dissipation substrate on the inner wall of an interlayer through heat conduction silica gel; the other side in the interlayer space is composed of a strip-shaped guide vane array with an adjustable inclination angle, ventilation and heat dissipation holes leading to the outside are formed in the top of the interlayer, and the strip-shaped guide vane array and the ventilation and heat dissipation holes are driven by a servo motor; collecting heat source temperature, environment parameters and crop canopy phenotype data in real time; and according to the received heat source temperature, environment parameters and crop canopy phenotype data, a self-adaptive environment regulation and control scheme is constructed through a reinforcement learning algorithm, and the blade inclination angle of the strip-shaped guide blade array, the operation frequency of the axial flow fan and the power of the heat pump are dynamically adjusted based on the environment regulation and control scheme. Therefore, the energy efficiency bottleneck of a split type heat dissipation framework can be broken through, and the problem of high energy consumption caused by heat dissipation of the LED driving power supply is solved; meanwhile, the thermal inertia defect of a phase change / fluid system is overcome, and the thermal management efficiency is improved.

An automatic dimming headlamp for locomotive meeting comprises a reflector lamp cup, an LED light-emitting module and a driver which are arranged in a lamp body shell, a meeting sensor is installed in the light emitting direction penetrating through the reflector lamp cup or in front of the reflector lamp cup and used for sensing coming vehicles of the opposite side, the meeting sensor is connected with a light source element sequentially through a regulator and the LED driver, and the light source element is connected with the LED light-emitting module. The light-emitting brightness of the light-emitting element is reduced during meeting. The utility model provides a more perfect locomotive headlamp composition scheme, and can realize automatic dimming without turning off when the locomotives meet relatively, so as to avoid obstacles for drivers of both parties to observe a front track.

An electrical parameter measuring circuit for an output signal of an LED driver comprises an input end and an output end of the measuring circuit, a current sampling circuit, a switch circuit, a switch driving circuit, a voltage division circuit, a first voltage follower, a second voltage follower, an ADC acquisition circuit, a level conversion circuit, a multiplexing circuit and a single-chip microcomputer. The input end of the measuring circuit is connected with the input end of the voltage division circuit and the current sampling circuit, and the current sampling circuit is connected with the output end of the measuring circuit through the switching circuit. The output end of the voltage division circuit is connected with the input end of the first voltage follower, and the output end of the current sampling circuit is connected with the input end of the second voltage follower and the input end of the level conversion circuit. The input end of the ADC acquisition circuit is connected with the output ends of the first and second voltage followers, and the output end of the ADC acquisition circuit is connected with the single-chip microcomputer. The output end of the level conversion circuit is connected with the single-chip microcomputer through the multiplexing circuit. According to the utility model, various electrical parameters such as direct current and constant current output by the LED driver can be measured.

In one embodiment, the invention provides an LED converter module (100) for connecting the output terminals (104) of an LED driver (101) and at least one LED module (102), comprising a first input interface (201) for wireless or wired control signals for an LED driver (101), a first processing circuit (202) for changing the values ​​of the control signals, a first output interface (203) for outputting the changed values ​​to the LED driver (101), a second input interface (204) for connecting to the output terminals of the LED driver (101), a second processing circuit (205) for changing at least one electrical parameter of the electrical power received from the output terminals, and a second output interface (206) for outputting the electrical power with the changed parameter to the LED module (102).

The utility model belongs to the technical field of vehicle lamp circuits, and specifically relates to a system for a vehicle taillight ECU to enter a functional safety mode based on an MCU failure, comprising: a LIN transceiver, a first control circuit, a second control circuit, an MCU microcontroller, an LDO circuit, a DC-DC circuit, a CAN transceiver, an LED drive circuit, and an LED, wherein the LIN transceiver, the first control circuit, and the second control circuit are all connected to a vehicle body KL30 power supply module, the LIN transceiver is connected to an ICAS vehicle body end LIN signal module, the LIN transceiver, the second control circuit, the LDO circuit, and the CAN transceiver are all connected to an MCU microcontroller, the LIN transceiver is connected to the first control circuit, the first control circuit, the second control circuit, and the CAN transceiver are all connected to the LDO circuit, and the second control circuit, the LED drive circuit, and the LED are all connected to the DC-DC circuit. The utility model provides a system for a vehicle taillight ECU to enter a functional safety mode based on an MCU failure, and adds a safety mechanism to monitor the MCU and the MCU power supply module.

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.