LED drive power is a power converter that converts power to specific voltages and currents to drive LED lights. Generally, the input of LED driving power includes high-voltage power frequency AC (that is, mains power), low-voltage DC, high-voltage DC, and low-voltage power frequency AC (such as the output of an electronic transformer).

First look at the metamaterials of the product

1. In order to determine the brand of the capacitor, the price is certainly more expensive than that of 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, overheating.

General procurement principles

Product reliability

LED products are mainly composed of LED chips and power supplies, heat sinks, control circuits, etc. 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 types of flow: one is a constant voltage source for multiple constant current sources, and each constant current source powers each LED separately. In this way, the combination is very flexible, and the LED failure along the way will not affect the work of other LEDs, but the cost will be slightly higher. The other is a DC constant current power supply, with LEDs running in series or in parallel. The advantage is lower cost, but less 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 while. In terms of cost and performance, the multi-channel constant current output power supply method will be better. Maybe the mainstream direction in the future.

3. Protection

In terms of protection, the lamp should be installed outdoors, 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 normal protection 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

In order to improve the life of LED driving power, we need to improve in many ways: capacitors with longer life, improve power efficiency, do a good job of heat dissipation of the power, and optimize the heat dissipation design of the lamp. The LED power supply is a switching power supply. The quality and reliability of a switching power supply depends on its circuit design, production process and equipment quality. Electrolytic capacitors are an important 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 an electrolytic capacitor depends on the life of the capacitor itself and the operating temperature. At different temperatures, the service life of electrolytic capacitors can vary greatly.

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