"LED constant current drive. Since the LED is a characteristic sensitive semiconductor device, it has a negative temperature characteristic, and it needs to be stabilized and protected in the application, thereby generating the concept of driving. LED device pair drive power Requires almost harsh, LED is not like ordinary incandescent bulbs, can directly connect 220V communication city electricity. LED is 2 ~ 3 volts low voltage driver, you must design complex transform circuits, different use LED lights, equipped with different Power adapter. Foreign customers in the international market, the efficiency conversion, effective power, constant current accuracy, power supply, and electromagnetic compatibility, and electromagnetic compatibility requirements of the international market are very high. Design a good power supply must consider these factors because of the power supply The role in the entire luminaire is as important as the heart like a person.
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1, LED brightness automatic adjustment control / LED automatic dimming / LED light strong automatic adjustment
The main function is to automatically adjust the brightness of the light, and the light brightness of the light is guaranteed to ensure the brightness of the lights under certain conditions of the environment. There are two working modes (automatic and manual mode). The system is operating in automatic mode. In automatic mode, the system automatically adjusts the brightness of the light, manual mode according to the environmental light intensity, manual mode, manually adjusts the light brightness by pressing the button.
1. When the environment is strong, the lamp will go out; when the environment is strong, the brightness is the largest; when it is in the middle position, the LED lamp is adjusted according to the light intensity.
2.LED light: use F5 straw hat LED lamp;
3. Light intensity test: use a photomic resistance detection environment light;
4. Immediate mode: PWM;
Note: The photosensitive resistance is the acquisition of ambient light intensity device, and cannot be directly illuminated directly by the LED light!
Scenario: https://www.cirmall.com/circuit/14629
2, 35W LED lighting driver based on ST HVLED001A
HVLED001A is a reinforced peak current mode controller that controls high power factor (HPF) fly or buck-boost topology in an LED driver of up to 150 W. Other topologies, such as step-down, boost, and SEPIC, can also be implemented.
The innovation of the ST is allowed to connect the HVLED001A device directly to the input voltage to activate the device and monitor the input voltage without the need for an external component.
The device is embedded in advanced features, which can accurately control the output voltage or output current using a large number of primary passive components. Starting and light-load conditions are managed by dedicated operation scenarios to improve the adjustment quality of output variables in the final application. Opening, output short circuit, input overvoltage / undervoltage, etc., such as an abnormality such as open loop and overcurrent of the main switch. Built-in Intelligent Auto Recovery Timer (ART) feature ensures that auto-application recovery without reducing reliability.
Core technology advantage
1. Vibration (QR) topology
2. 800V high pressure start
3. Ultra-low start and static current
4. Primary side fixed voltage regulation (PSR Mode)
5. HV PIN Measurement Input Voltage and Detection Input Overvoltage
Program specifications
1. High power factor, THD low
2. Programmable minimum shutdown time
3. 0-10 PWM dimming
4. Built-in Intelligent Recovery Timer (ART) function ensures that the automatic application is recovered without reducing reliability
Scenario: https://www.cirmall.com/circuit/15922
3,5 meter long LED light string LED driver circuit diagram PCB design
The LED STRING LIGHT module is essentially a LED drive containing LED strings in the package. The module operating voltage is 3.3V / 5V. However, the working voltage required by the LED string is 12V. Therefore, the module provides a normal operating voltage using the AIC 1896-based DC-DC boost converter to the LED strip. The LED strip has a length of 5 meters and has 50 RGB LEDs that are equivalent to each other. You can use these to dress up the Christmas tree, light your deal or decorate your room.
characteristic:
Combined with LED lamp strips
9 meters long LED lamp strip
50 RGB LEDs containing equal spacing in the length of 5 meters can present colorful appearance
JST 2.0 interface, used to connect LED strips to the drive module
Connect to other Grove modules using standard 4-Pin Grove cables
Scenario: https://www.cirmall.com/circuit/9959
4, 10W LED driver based on ST HVLED815PF
The friend is a 10W LED Driver evaluation board, which uses ST HVLED815PF as the primary controller to achieve the function of the drive LED. ST HVLED815PF is a topology of quasi-resonument, built-in 800V / 6Ω MOSFET, and adjusts the output with a side coil induction method (PSR), saving a photocoupler cost and increases the utilization of PCB, and achieve high power Factor> 0.9, the highest efficiency is as high as 84% and the fixed current output accuracy is ± 3%.
Core technology advantage
Vibration resonance (QR) operation
2. Built-in 800V / 6Ω MOSFET
3. Built-in high pressure start
4. One side coil adjustment output, no optocoupler
Program specifications
1. High Power Factors> 0.9
2. LED unit capacification accuracy is ± 3%
3. The power is up to 15W @ 230VAC
Scenario: https://www.cirmall.com/circuit/16272
5, LED dot maneuct STC8 master + DS1302 timing + DS18B20 temperature + 74HC595 drive LED dot matrix
1. All 74HC595 driver 16 * 32 LEDs.
2, DS18B20 collection temperature.
3, DS1302 is equipped with a battery to do a clock system. You can modify the time and alarm through three buttons.
4, character modeling can be taken using any of 9 in the compressed package. Or download other software online.
5, STC8F2K16S2 single-chip microcomputer is control core. Suitable for students to do graduation design and DIY enthusiasts.
6. Data I / O portfolio can be free to change according to the actual situation of the user. Dotting direct modularization, reducing circuit welding workload. You need to buy a module to go to Qixu Electronics for purchase.
7, support USB downloads, follow-up to increase the functions such as infrared remote control.
Scenario: https://www.cirmall.com/circuit/750
6,51 single-chip microcompression LED creative LED wireless power supply POV rotating screen full set of information
Wireless power supply of LEDs based on 51 single chip microcomputers. Yes: Program + Schematic + PCB (Wireless Power Supply Board and Master) + BOM Table + The complete expansion tutorial data collected by the owner.
Scenario: https://www.cirmall.com/circuit/2026
7, 50W LED drive constant current source design, 1.5A constant current source, support LED lamp 10 string 5
This 50W LED drive is a constant current source of 1.5A. Used to drive 10 string 5 and LED lights, 50 highlighted LED lamps, have a high PF value (PF> 0.96), short circuit, open protection, 90% efficiency. This work uses PSR (original feedback), saving the secondary feedback TL431 and optocoupler, making it easier. 50W of LED light board, you can search Taobao, there are many money. (When using the LED lamp, be sure to add a heat sink, and the heat sink is large enough).
Scenario: https://www.cirmall.com/circuit/7577
8. Car taillight scheme design based on STM ALED1262ZT automotive grade 12 channel LED driver (including schematic + program]
Steval-LLL002M1 is a LED array drive system board with local dimming and diagnostic functions for automotive applications. It is based on ALED 1262ZT 12 channel LED drive controlled by STM8AF6266 microcontroller I2C interface. 48 red LED matrices are driven by four ALED1262ZT LED drives. Onboard A7986A DC-DC converter accepts standard adapter input voltages with reverse polarity, providing voltage and power for board operation.
Steval-LLL002V1 Kit Jumper Analog LED Opening Fault, 4-foot SWIM connector is used to debug and develop STM8AF6266 microcontroller cities. The kit can run in the bus drive mode (BDM), Independent Mode (SAM), and GUI mode. In the bus driven mode, the board is controlled by the onboard button and the potentiometer. The ALM1262ZT driver command is sent by the STM8A microcontroller via the I2C bus.
STSW-LLL002FW Program implements an 8-bit automotive-level STM8AF6266 microcontroller that allows an I2C interface to configure and control a ALED1262ZT LED drive. The program is designed for the Steval-LLL002V1 assessment kit, which is used to demonstrate the ALED1262ZT function to develop applications with automotive taillights with pattern animations.
Embedded GUI (STSW-LLL002GUI) Allows you to control buttons, write / read configuration registers and single channel brightness, and how to program up to 20 LED modes with variable conversion speeds or use four preconfiguration modes.
In standalone mode, the Steval-LLL002V1 assessment kit is not controlled by MCU, you can use OTP 1SPDT switch (SW2) to select two possible output configurations.
In GUI mode, the board is connected to the PC via a USB-UART bridge, and you can observe and control the various functions of the drive by graphical user interface.
The PC application provides a graphical interface for controlling the failure detection function of the 4 x 12 LED lighting array and monitors the Steval-LLL002V1 evaluation kit. This kit is designed to represent the rear car LED lighting application, and has STM8AF6266 microcontroller and Four ALED1262ZT Auto-Level LED Drivers. Once the Steval-LLL002V1 array board and the UART bridge are properly connected, the GUI will quickly connect, and provide 12 - 24 V D
main feature
1. Automatic port selection and board recognition
2. Basic mode:
Enable or disable hardware buttons
Driver error detection and visualization
Collective and single LED switch
Read and write configuration registers
3. Advanced mode: Individual channel brightness control
4. Frame program:
Program up to 4 preset animation modes on the board
Design and preview custom animation mode
Set the frame number and delay C power. You can then start operating any or all 48 red LEDs on the array board using separate interfaces for basic and advanced mode control. GUI also provides a special third interface.
To design and record custom animations and modes that you can download and run on the LED drive array board.
Scenario: https://www.cirmall.com/circuit/17049
9. miniled ring
describe
This is a small flashing, by a CR2032 coin battery
And 20 LEDs driven by ATTINY45 brain. The firmware is written in pure C, and
Compile with AVR-GCC toolchain. PCB is made by
Two-layer design made from Kicad.
detail
For a few more time, I am thinking about how to reduce the LED flashes. The first obvious step is from 3 mm LED to SMD. However, there is still such a minute gap between the LEDs that are short-circuited to the welding bridge during welding. Can we avoid this gap in some way? If we connect each anode to the cathode of the previous LED in the LED chain, can we still add each LED separately? Because each LED is not a gpio is not an option. It must be like charlieplexing. So I started the sketch topology.
Scenario: https://www.cirmall.com/circuit/8019
10, bicycle LED wind turbine lamp
Bicycle LED wheel lamp. 32 points LED display, static display driver, simple and stable work.
Save space design, less than 10cm * 10cm, convenient and low cost.
By dividing a longer PCB into two parts, the connecting drain is welded into a longer PCB board.
The LED flame lamp is a single-chip microcomputer with STC12C5A60S2 (STC 12C5A60S2 Data Manual), LQFP44 package. Onboard reed tubes, each transition can be achieved once.
LED color is customized, the pattern is random programming. Working voltage 4.1-5.5V. You can charge the treasure with a dry battery or small size.
The interior of the attachment includes schematic and PCB (open with Altium Designed software), and the control code will be uploaded.
Scenario: https://www.cirmall.com/circuit/1212
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