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Resonant Switching Power Supply Device

  • US 20080024094A1
  • Filed: 04/20/2005
  • Published: 01/31/2008
  • Est. Priority Date: 05/07/2004
  • Status: Active Grant
First Claim
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1. A resonant switching power supply device comprising:

  • a power supply circuit for outputting a DC power, a switching circuit having multiple switching elements, to which the DC power of said power supply circuit is input, for carrying out switching operations complementarily, a resonance circuit, to which the output of said switching circuit is input, having series-connected devices comprising a first resonance capacitor and a resonance coil, a switching transformer, and a second resonance capacitor connected in parallel with the primary winding of said switching transformer, a rectifying/smoothing circuit to which the secondary output of said switching transformer is input and in which the input is rectified and smoothed and then output, a current detection circuit comprising a detection transformer having a primary winding in which a current substantially identical to the current flowing in the primary winding of said switching transformer flows, a rectifying circuit for rectifying the secondary output of said detection transformer, and a current-voltage conversion circuit for converting the output of said rectifying circuit into a voltage, and a control circuit, to which the outputs of said power supply circuit, said rectifying/smoothing circuit and said current detection circuit are input, for controlling the switching operations of said switching elements in said switching circuit.

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