Original edge scheme of LED dimmer power supply manufacturer
The original edge scheme is to control the output power and current completely in the ac original edge, and the most accurate time can achieve 5% of the constant current accuracy, while the secondary edge only needs a simple output circuit. The original side mainly relies on the feedback of the auxiliary side to control the drive output voltage. The original side relies on the current-limiting resistance to control the current of the original side. At the same time, it is multiplied by the transformer turn ratio to control the accuracy of the drive output current. This original edge scheme inherits all kinds of advantages of isolated flyback circuit, and at the same time, it is simple in architecture, which can achieve small size and low cost. At present, it has become the mainstream driving scheme.
It is difficult to control the production precision of transformers, which leads to the large output current drift when using low-quality transformers in the original edge scheme. Dongguan Lingguan pointed out that the side constant current control circuit was added to the original edge scheme after the technical improvement. Although it was more complex than the ordinary side scheme before, the optical coupling and so on could still be eliminated when compared with the flyback scheme, and the systematic price ratio was still the highest.

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