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Power supply with a feedback circuit relieving spikes

  • US 7,852,649 B2
  • Filed: 11/15/2007
  • Issued: 12/14/2010
  • Est. Priority Date: 06/07/2007
  • Status: Expired due to Fees
First Claim
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1. A power supply comprising:

  • a power supplying circuit;

    a power controlling circuit having an output terminal coupled to an input terminal of the power supplying circuit;

    a first switch;

    a pulse width modulation signal source coupled to a first terminal of the first switch; and

    a feedback circuit comprising;

    a first operational amplifier having a first input terminal coupled to a first reference voltage source, and a second input terminal coupled to a second terminal of the first switch;

    a first resistor having a first terminal coupled to an output terminal of the first operational amplifier;

    a first diode having a first terminal coupled to a second terminal of the first resistor;

    a first capacitor having a first terminal coupled to a second terminal of the first diode, and a second terminal coupled to ground;

    a second resistor having a first terminal coupled to the second terminal of the first diode;

    a second diode having a first terminal coupled to a second terminal of the second resistor;

    a third resistor having a first terminal coupled to a second terminal of the second diode, and a second terminal coupled to the second terminal of the first capacitor;

    a second operational amplifier having a first input terminal coupled to a second reference voltage source, a second input terminal coupled to the second terminal of the second diode, and an output terminal coupled to an input terminal of the power controlling circuit; and

    a fourth resistor having a first terminal coupled to the output terminal of the second operational amplifier, and a second terminal coupled to the first terminal of the third resistor.

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