| 摘要 |
PROBLEM TO BE SOLVED: To provide a ZVS method and a ZVS power converter which has no ringing sound, capable of improving many defects caused by the ringing sound symptom, and which is used in an electric power converter. SOLUTION: An auxiliary reactor La for a ZVS circuit is provided between a primary coil Np for a transformer and a DC connection contact between two power switches Q1 and Q2 . One or two diode s D3 , D4 are added to a circuit contact between the primary coil Np for the transformer and the auxiliary reactor La, corresponding to which the type of half-wave rectification or full- wave rectification is the power converter. The diodes D3 , D4 short-circuit the current of the auxiliary reactor La, by acting with the power switches Q1 , Q2 which respectively react on, when the ringing sound symptom starts at an L-C circuit formed out of the auxiliary reactor La and a primary stray capacitance of the transformer to restrain the primary stray capacitance voltage of the transformer and block the oscillation.
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