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Switched-mode power supply and method for determining the supply voltage in a switched-mode power supply

  • US 6,411,119 B1
  • Filed: 04/14/2000
  • Issued: 06/25/2002
  • Est. Priority Date: 04/14/1999
  • Status: Expired due to Term
First Claim
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1. A switched-mode power supply, comprising:

  • a transformer having a primary coil;

    a switch for providing a pulsed application of a variable supply voltage to said primary coil of said transformer;

    a current measuring configuration providing a current measurement signal dependent on a current through said primary coil; and

    an evaluation circuit connected to said current measuring configuration, said evaluation circuit determining a value of the variable supply voltage by evaluating a time characteristic of at least one of the current through said primary coil and the current measurement signal.

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