Deep analysis LED high power drive power supply and its application products
High-power LEDs for general lighting are new topics in this century. The comprehensive advantages of energy saving, safety and long life will lead to the revolution of the next round of lighting industry. However, high-power LEDs are low-voltage unidirectional conductive devices, normal. The forward voltage drop during operation is 3-4 volts. To be used for general lighting, the problem of power conversion must be solved.
There are four kinds of situations for powering the LEDs with the original power supply: low voltage driving LEDs, transition voltage driving LEDs, high voltage driving LEDs, and mains driving LEDs. Different situations have different technical implementations of power converters. Solution. Below we briefly introduce the power drive method and its application products under these circumstances.
1. Low voltage driving LED
Low-voltage drive means driving a light-emitting diode with a voltage lower than the forward voltage drop of the LED, such as a normal dry battery or a nickel-chromium/nickel-hydrogen battery, and its supply voltage is between 0.8-1.65V.
Low-voltage driving of the LED requires a voltage that is raised enough to turn the LED on. This is a common use case for low-power lighting devices such as LEDs, such as LED flashlights, LED emergency lights, Energy-saving lamps and so on.
Low-voltage driving LEDs mainly solve the problem of boosting. Due to the limitation of battery capacity, the power is generally small, but it requires minimum cost and high conversion efficiency. Considering that it is possible to work with a No. 5 battery, A minimum volume is required. The best technical solution is a pump boost converter.
LED -1W1P is a pulse output LED driver module with pump boosting scheme. It has the simplest circuit structure, the lowest production cost, the smallest volume, the highest conversion efficiency, and the convenience of a 10K potentiometer. 0—100% continuous pulse width dimming. Normal working voltage is 0.8-1.8V, starting voltage is 0.6V, fully extinguished voltage is lower than 0.35V. Maximum output power is 1W. It can be used to drive a 350mA 1W high power LED. Or drive 18 20mA low-power LEDs in parallel. This module is not a precision control device, the battery voltage will reduce the output power.
The module has 5 pinouts, positive power supply, negative power supply, output pin, and two dimming control pins. The positive pole of the LED is connected to the output pin, the negative pole is connected to the negative pole of the power supply, and a 10K potentiometer is connected between the control poles for dimming. No dimming is required, and the two control legs can be directly connected. The module has a circular structure. The volume is: Φ14.5×13mm.
This type of module must not be energized at no load, otherwise it may be damaged.
LED-3W6D is a pump-type boost DC output LED driver module with input voltage of 6V, maximum output voltage of 12V, output power of 4 watts, output current of 350mA, and can drive 1 to 3 1 watt high power LEDs. Module There are 5 pins, power supply positive, power supply negative, output positive, output negative, control pin. Module volume 30×18×16mm.
The module has strong functions, the output has a current limiting function, and the input has a low voltage cut-off function to protect the battery from over-discharge. The control terminal can accept external light control and remote control signals to realize controlled switching.
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