×

Switching power supply apparatus

  • US 20040227496A1
  • Filed: 03/08/2004
  • Published: 11/18/2004
  • Est. Priority Date: 05/16/2003
  • Status: Active Grant
First Claim
Patent Images

1. A switching power supply apparatus comprising:

  • a first switching circuit for supplying and interrupting power from a power supply input unit;

    an inductor for accumulating the power input through the first switching circuit and discharging the power to a power supply output unit;

    a rectifier diode for rectifying a current flowing to the output unit; and

    a smoothing capacitor for smoothing a voltage of the output unit;

    wherein a first commutation inductor is provided in a path of current flowing from the power supply input unit through the first switching circuit and the inductor during an ON period of the first switching circuit;

    a second commutation inductor is provided in a path of current flowing through the inductor during an OFF period of the first switching circuit;

    the inductor and the first and second commutation inductors are connected to a first junction point;

    a clamping series circuit including a second switching circuit and a series capacitor connected in series is provided, and one end of the clamping series circuit is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, so that the first and second commutation inductors and the series capacitor constitute a resonance circuit;

    the first switching circuit includes a parallel circuit of a first switching element, a first diode, and a first capacitor;

    the second switching circuit includes a parallel circuit of a second switching element, a second diode, and a second capacitor; and

    a switching control circuit for alternately turning on/off the first and second switching elements in a period when both switching elements are off therebetween is provided.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×