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Control circuit for controlling output current at the primary side of a power converter

  • US 6,977,824 B1
  • Filed: 08/09/2004
  • Issued: 12/20/2005
  • Est. Priority Date: 08/09/2004
  • Status: Expired due to Term
First Claim
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1. A control circuit for controlling an output current at a primary side of a power converter, comprising:

  • a waveform detector, generating a current-waveform signal by sampling a primary side switching current of a transformer through a current-sense device;

    a discharge-time detector, coupled to said transformer for detecting a discharging time of a secondary side switching current;

    an integrator, for generating an integrated signal in response to said discharging time and said current-waveform signal; and

    a switching control circuit, including a reference voltage, wherein said switching control circuit generates a switching signal in response to said integrated signal and said reference voltage;

    wherein said switching signal switches said transformer and regulating the output current of said power converter in accordance with said reference voltage.

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