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Power supply and DC-DC converter with voltage drop circuit therein

  • US 9,350,242 B2
  • Filed: 04/22/2014
  • Issued: 05/24/2016
  • Est. Priority Date: 05/03/2013
  • Status: Active Grant
First Claim
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1. A power supply comprising:

  • a smoothing circuit unit to receive a voltage and to smoothen the voltage; and

    a voltage drop circuit unit to drop the smoothened voltage,wherein the voltage drop circuit unit comprises;

    an electric charge storage circuit to output the dropped smoothened voltage;

    a resonance circuit to receive first current from the smoothing circuit unit and to supply second current to the electric charge storage circuit;

    a switching circuit, the switching circuit including;

    a first switch to control the first current such that the first current is supplied to the resonance circuit and the electric charge storage circuit via the first switch; and

    a second switch to control the second current such that the second current is supplied to the electric charge storage circuit via the second switch; and

    a rectifier circuit, the rectifier circuit including;

    a first diode to pass the first current and to shut off the second current; and

    a second diode to pass the second current and to shut off the first current.

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