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Unity power factor power supply for use with variable frequency power sources

  • US 5,959,852 A
  • Filed: 12/19/1997
  • Issued: 09/28/1999
  • Est. Priority Date: 12/19/1997
  • Status: Expired due to Term
First Claim
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1. A power factor controller for a switched power supply including a pulse width modulation control input, the switched power supply receiving input power at variable frequencies and providing output power with an optimized power factor, the power factor controller comprising:

  • a sample and hold circuit coupled to the switched power supply to receive an electrical voltage parameter related to the input power and to provide an averaged sampled parameter; and

    a control circuit having a control output coupled to the pulse width modulation control input, the control circuit coupled to the sample and hold circuit, the control circuit generating the pulse width modulation signal in response to an integral of a factor, the factor being equal to a current parameter related to the output power plus the electrical voltage parameter multiplied by a voltage error factor related to the output power divided by a square of the averaged sampled parameter.

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