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Flyback converter with secondary side regulation

  • US 10,008,947 B2
  • Filed: 07/06/2016
  • Issued: 06/26/2018
  • Est. Priority Date: 07/31/2015
  • Status: Active Grant
First Claim
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1. A flyback converter, comprising:

  • a transformer, including;

    a primary winding, including a first end to receive an input voltage signal, and a second end,a secondary winding, including a first end to provide an output voltage signal, and a second end, andan auxiliary winding including a first end, and a second end coupled with a first constant voltage node;

    a first switch, including a first terminal coupled with the second end of the primary winding, a second terminal coupled with the first constant voltage node, and a first control terminal to receive a first switching control signal;

    a second switch, including a first terminal coupled with the second end of the secondary winding, a second terminal coupled with a second constant voltage node, and a second control terminal to receive a second switching control signal;

    a first control circuit, including an input coupled with the first end of the auxiliary winding to receive a first signal representing a voltage of the auxiliary winding, and an output to provide the first switching control signal to the first switch, the first control circuit operative in a first mode to independently turn the first switch on and off in a plurality of power transfer cycles, the first control circuit operative in a second mode to initiate a power transfer cycle by turning the first switch on and off, in response to detecting a predetermined cycle start request signal at the input; and

    a second control circuit, including an output to provide the second switching control signal to the second switch, the second control circuit operative to generate the predetermined cycle start request signal to regulate the output voltage signal by turning the second switch on and off after a current of the secondary winding returns to zero in a given power transfer cycle to cause the first control circuit to initiate a new power transfer cycle.

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