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PROTECTION CIRCUIT FOR POWER SUPPLY

  • US 20160352094A1
  • Filed: 05/23/2016
  • Published: 12/01/2016
  • Est. Priority Date: 05/26/2015
  • Status: Active Grant
First Claim
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1. A protection circuit for power supply, the power supply includes a power conversion unit and said power conversion unit includes a primary winding and a secondary winding;

  • said primary winding receives an input voltage; and

    said secondary winding is used for generating an output voltage, and said protection circuit comprising;

    a first impedance unit, coupled to said secondary winding of said power conversion unit, a loading current of said power supply flowing through said first impedance unit, and said output voltage generated at said first impedance unit;

    a second impedance unit, coupled to said secondary winding of said power conversion unit, and generating a reference voltage;

    a comparison unit, coupled to said first impedance unit and said second impedance unit, and comparing said output voltage and said reference voltage to generate a protection signal for turning off said power supply; and

    an adjustment unit, coupled to said second impedance unit and said comparison unit, generating a reference current to adjust the magnitude of said reference voltage for controlling said comparison unit to output said protection signal.

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