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Switching power supply

  • US 6,111,762 A
  • Filed: 01/20/1999
  • Issued: 08/29/2000
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Term
First Claim
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1. A switching power supply receiving a voltage from a DC power supply and generating an isolated DC voltage for a load, the switching power supply having a power saving mode initiated by a received power saving signal, the switching power supply comprising:

  • a transformer including a primary winding, a secondary winding and a tertiary winding;

    a semiconductor switch connected to the DC power supply through said primary winding;

    a control circuit for controlling said semiconductor switch;

    a rectifier circuit, said rectifier circuit being operatively coupled to said secondary winding, whereby the isolated DC voltage is generated;

    a voltage regulator circuit, said voltage regulator circuit being operatively coupled to said rectifier circuit and selectively reducing the isolated DC voltage in response to a received power saving signal;

    a power supply circuit, said power supply circuit being responsive to a voltage output of said tertiary winding and providing a voltage output to said control circuit; and

    a voltage detector circuit, said voltage detector circuit being responsive to said power supply circuit and providing an output signal when the voltage output is less than a predetermined value, said control circuit receiving said voltage detector circuit output signal and reducing the operating frequency of said semiconductor switch in response thereto, whereby a power saving mode of operation is provided in response to the received power saving signal.

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