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Switching power converter circuits providing main and auxiliary output voltages

  • US 6,775,159 B2
  • Filed: 02/21/2002
  • Issued: 08/10/2004
  • Est. Priority Date: 02/19/2001
  • Status: Expired due to Term
First Claim
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1. A converter circuit comprising:

  • a transformer core;

    a primary winding, the primary winding being wound around the transformer core;

    a secondary winding, the secondary winding being wound around the transformer core;

    a main rectification circuit, including a first output capacitor and a rectifier that controls current flow through the first output capacitor;

    an auxiliary rectification circuit;

    wherein the main rectification circuit and the auxiliary rectification circuit are both connected to the secondary winding and produce output voltages having different magnitudes;

    a drive circuit, the drive circuit being coupled to receive a supply voltage;

    a drive control circuit, the drive control circuit being coupled to the drive circuit and controlling the drive circuit to apply a pulse width modulated voltage to the primary winding;

    wherein the output voltage produced by the auxiliary rectification circuit is provided to the drive control circuit; and

    wherein the drive control circuit synchronizes operation of the rectifier to the pulse width modulated voltage by using the output voltage produced by the auxiliary rectification circuit to produce a control signal for the rectifier, a magnitude of the voltage of the control signal being determined at least in part by the magnitude of the output voltage of the auxiliary rectification circuit.

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