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Switching power supply utilizing switch-selectable resistors to determine output voltage

  • US 20070279952A1
  • Filed: 08/09/2007
  • Published: 12/06/2007
  • Est. Priority Date: 04/26/1994
  • Status: Active Grant
First Claim
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1. A power supply comprising:

  • a terminal for receiving a DC voltage;

    a transformer having a primary winding and a secondary winding;

    a switching circuit coupled between the terminal and the primary winding for providing alternating current to the primary winding;

    a rectifier circuit coupled to the secondary winding to provide a DC output voltage;

    a controller circuit for controlling the switching circuit to modulate the alternating current provided to the primary winding; and

    a circuit receiving first and second input signals, the first input signal having a magnitude which is determined by the DC output voltage, the second input signal having a magnitude determined by a selected position of a multiposition switch, and an output of the circuit generating a feedback signal which is coupled to the controller circuit.

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