PURPOSE:To conduct a stable resonance operating with easy control by connecting a reactor between a connecting point for connecting one terminal of a first auxiliary switch to the other terminal of a second auxiliary switch and a connecting point of first and second main switches. CONSTITUTION:Dividing points P1, P2 of a DC power source E are respectively connected to one terminals of first, second auxiliary switches S1s, S2s. One terminal of a resonance reactor 2 is connected to the other terminals of the switches S1s, S2s. First, second main switches S1, S2 are connected between the other terminal of the reactor 2 and electrodes of the power source E. Further, resonance capacitors 3a, 3b having the same capacity are connected in parallel with diodes D1, D2 of the switches S1, S2. Thus, a resonance operation at the time of converting a current is stably conducted irrespective of timing for turning OFF the switches S1, S2. Thus, an efficient inverter operation can be conducted.
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