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Ask about PFC circuit.

Hardware design
novembre 26, 2020 by Riley 467

I often see the design of a diode in parallel with a PFC inductor on the Internet, such as D1 in the figure above. What is the function of this diode?

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Connor Posté sur November 26, 2020

Is it because the PFC circuit has a sudden large current at the moment of opening to provide a direct charging path? Or is it for other reasons?

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Taylor Posté sur November 26, 2020

In order to protect the secondary chip of D2 and T1 from damage, it may also suppress the surge during electrolytic power-up.

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Ashley Posté sur November 26, 2020

In the surge test, use the large electrolysis as a clamp.

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