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Power supply device

  • US 5,771,159 A
  • Filed: 07/10/1997
  • Issued: 06/23/1998
  • Est. Priority Date: 11/25/1994
  • Status: Expired due to Term
First Claim
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1. A power supply device comprising:

  • rectifying means for rectifying AC power and providing a pulsating DC output voltage;

    inverter means connected to said rectifying means for converting the pulsating DC output voltage to a high frequency output voltage and supplying the high frequency output voltage to a load, said inverter means including first and second switching elements connected in a first series circuit, one of said first and second switching elements being ON when the other of said first and second switching elements is OFF, an impedance element connected between said rectifying means and said first series circuit, and a resonant circuit including a capacitor and a first inductor for providing a resonant output voltage to the load, said resonant circuit and said impedance element forming a second series circuit connected in parallel with one of said first and second switching elements; and

    valley-filling means for accumulating energy from said inverter means when the pulsating DC output voltage has a relatively high amplitude and for supplying accumulated energy across said first series circuit when the pulsating DC output voltage has a relatively low amplitude, said valley-filling means including;

    a third series circuit comprising a first valley-filling capacitor, a second inductor, and a first diode, said third series circuit being connected across said first series circuit;

    a second diode for rectifying the high frequency output voltage of said inverter, charging said first valley-filling capacitor, and connected between said inverter means and a junction of said second diode and said first valley-filling capacitor; and

    a second valley-filling capacitor connected across said first series circuit.

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