The drive circuit has always been an important part of the LED application products. The LED drive power supply is one of the many types of power supply products. It belongs to the device that provides power to the LED electronic equipment such as LED lighting fixtures. , it is to provide energy-saving lamps and lanterns and provide the electrical energy required by related components in the computer. Widely used in: LED street lights, LED grill lights, LED indoor lights, LED ceiling lights, building lighting, road and bridge lighting, etc. Internal reading lights, brake lights outside the car, tail lights, turn signals, side lights, explosion-proof lamps, miner's lamps in mining production, etc.
In recent years, with the continuous development of LED lamp packaging technology and heat dissipation technology, the stability of LED lamps has reached a relatively good level. Light decay and color drift are mainly caused by the products of some cottage manufacturers. The main reason is the unreasonable heat dissipation design. Since the quality of the LED driving power directly restricts the reliability of the LED, with the development of the LED industry, the LED driving power has gradually developed and matured.
Usually, the following points should be considered when selecting and designing an LED driver power supply:
1. The main feature of high-efficiency LED products is energy saving, so the efficiency of the driving power supply must be high. It is very important for the structure where the power supply is installed in the luminaire. The luminous efficiency of the LED decreases with the increase of the LED temperature, so the heat dissipation of the LED is very important. The efficiency of the power supply is high, its power consumption is small, and the heat generation is small, which reduces the temperature rise of the lamps. It is beneficial to delay the light decay of LED.
2. High power factor Power factor is the requirement of the grid for the load. Generally, there are no mandatory national regulations for electrical appliances below 70 watts. Although the power factor of a single electrical appliance with low power is low, it has little impact on the power grid, but everyone turns on the lights at night, and the same load is too concentrated, which will cause serious pollution to the power grid. For the 30W~40W LED drive power supply, there may be certain index requirements for the power factor.
3. High reliability Especially like the driving power supply of LED street lamps, it is installed in a high-altitude sealed environment, and maintenance is inconvenient and expensive.
4. There are two types of driving methods: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED individually. In this way, the combination is flexible, and the failure of one LED will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, with LEDs running in series or parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it also needs to solve the problem of a certain LED failure without affecting the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply method will be better in terms of cost and performance. Maybe the mainstream direction in the future.
5. Surge Protection This is only required in certain environments. The ability of LED to resist surge is relatively poor, especially the ability to resist reverse voltage. Strengthening this protection is also important. Some LED lights are installed outdoors, such as LED street lights. Due to the start-up of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some of the surges will cause damage to the LED. Therefore, the LED drive power supply must have the ability to suppress the intrusion of surges and protect the LED from being damaged.
6. Protection function In addition to the conventional protection function of the power supply, it is better to increase the negative feedback of the LED temperature in the constant current output to prevent the LED temperature from being too high.
7. In terms of protection, in some environments, the lamps and lanterns are installed outside, and the power supply structure should be waterproof and moisture-proof, and the shell should be resistant to sunlight.
8. The life of the driving power supply should be adapted to the life of the LED.
9. To comply with safety regulations and electromagnetic compatibility requirements
The requirements of LED devices for driving power are almost harsh. Unlike ordinary incandescent bulbs, LED lights can be directly connected to 220V AC mains. LEDs are driven by a low voltage of 2 to 3 volts, and complex conversion circuits must be designed. LED lights with different uses must be equipped with different power adapters.
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