Engineers teach you how to make your own efficient and low-cost LED power supply solution-EEWORLD

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The design of LED power supply needs to consider many factors. Efficiency and quality are important, but cost control is a must. How to find a balance between these three factors can design a better power supply solution. This article introduces a low-cost power supply solution designed by an engineer for your reference.

　　Program Features:

　　Isolation solution: Can pass CE

　　Input: AC85~265V

　　Output: 9.05V current 0.7A

　　PF value: 220V, 0.938 (can be adjusted a little higher)

　　THD: about 15%

　　Power efficiency: 82%

　　Size: PCB40*25*16

　　The entire power supply material costs about RMB 8

　　Using 3x3WRM6 transformer, the transformer schematic diagram is as follows:

　　Figure 1: Transformer schematic

　　The schematic diagram of the scheme is as follows:

　　Figure 2: Solution block diagram

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