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Resonant inverter apparatus

  • US 6,069,809 A
  • Filed: 05/04/1999
  • Issued: 05/30/2000
  • Est. Priority Date: 05/08/1998
  • Status: Active Grant
First Claim
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1. A resonant inverter apparatus comprising:

  • a DC voltage source for generating a DC voltage;

    an inverter portion connected to the positive and negative rails of the DC voltage source, the inverter portion including upper main switches and lower main switches being series-coupled in each phase, main switching devices provided in the upper and lower main switches respectively, and flywheel diodes connected in antiparallel with the main switching devices respectively;

    bus-splitting means connected to the positive and negative rails of the DC voltage source, or a variable DC source connected to the negative rail of the DC voltage source;

    a resonant circuit portion connected to the junction of a pair of series-coupled bus splitting means or the other terminal of a variable DC source and the inverter portion, the resonant circuit portion including resonant reactors, auxiliary switches, and resonant capacitors, the resonant reactors and the auxiliary switches being connected in series circuits, the series circuits being connected between the junction of a pair of series-coupled bus splitting means and the junctions of the respective phases in the inverter portion, the resonant capacitors being connected in parallel with the series circuits respectively;

    current detection means for detecting currents flowing through the resonant reactors; and

    gate drive means for turning on an auxiliary switch, which is in the series circuit connected to the junction between series-coupled main switches of a phase to be switched, among the auxiliary switches to cause resonance by the related resonant reactor and the related resonant capacitor, for enabling main switching devices, which are of the phase to be switched, among the main switching devices to implement zero-voltage switching, and for turning off the auxiliary switch in the series circuit connected to the junction between series-coupled main switches of the phase to be switched when the current flowing through the related resonant reactor which is detected by the current detection means becomes substantially zero.

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