LED drive power is a power converter that converts the […]
LED drive power is a power converter that converts the power supply into a specific voltage and current to drive LED light. Generally, the input of LED drive power includes high-voltage power frequency AC (that is, mains), low-voltage DC, high-voltage DC, low-voltage Frequency AC (such as the output of an electronic transformer), etc.
First look at the meta-materials of the product
1. To identify the brand of capacitors, Ruby (Japan) is particularly well-known, of course, the price is more expensive than other brands of capacitors.
2. Whether to bring an IC control chip, because the IC control chip has protection functions such as short circuit, overvoltage, overload, and overtemperature.
General purchasing principles
1. Product reliability
LED products are mainly composed of LED chip and power supply, heat dissipation shell, control circuit and so on. The quality of the LED power supply directly affects the quality of the product. In particular, LED street light products are installed at high altitudes, making maintenance inconvenient and expensive.
2. Driving method
There are two kinds of traffic now: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. In this way, the combination is flexible, and LED failures along the way will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, LEDs run in series or parallel. Its advantage is lower cost, but poor flexibility. It also needs to solve the problem of one LED failure, which does not affect the operation of other LEDs. These two forms coexist for a period of time. Multi-channel constant current output power supply method will be better in terms of cost and performance. Maybe the mainstream direction in the future.
In terms of protection, the lamps should be installed outside, the power supply structure should be waterproof and moisture-proof, and the shell should be resistant to sunlight.
4. Protection function
In addition to the conventional protection function of the power supply, it is best to add negative feedback of the LED temperature to the constant current output to prevent the LED temperature from becoming too high.
5.LED Power Life
To improve the life of LED driving power, we need to improve it in many ways: use capacitors with higher life, improve power efficiency, do a good job of heat dissipation of the power supply, and optimize the heat dissipation design of the lamp. LED power supplies are switching power supplies. The quality and reliability of a switching power supply depends on its circuit design, production process, and device quality. Electrolytic capacitors are an essential part of high-power switching power supplies. The normal working life of a switching power supply depends on the life of the electrolytic capacitor used by the power supply. The life of the electrolytic capacitor depends on the life of the capacitor itself and the operating temperature. The operating life of the electrolytic capacitor varies greatly at different temperatures.
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