| 摘要 |
PURPOSE:To reduce power loss by inserting a discharging resistance between a junction point of a diode with a capacitor and an electrolytic capacitor. CONSTITUTION:A self-excited voltage-type inverter is provided with an electrolytic capacitor 1, a snubber circuit 130 and an inverter main circuit 4, among which the snubber circuit 130 is composed of a diode 31, a capacitor 32 and a discharging resistance 133 and inserted between positive and negative terminals of the inverter main circuit 4. In this case, the discharging resistance 133 of the snubber circuit 130 is inserted between a junction point of the diode 31 with the capacitor 32 and the positive pole side of the electrolytic capacitor 1. In this way, during a moment when the transistor of the inverter main circuit 4 receives an ON signal so as to be in an ON state, the capacitor 32 cannot discharge through the discharging resistance 133 and to the inverter main circuit 4, the electric current flows from the electrolytic capacitor 1. As a result, a power loss due to the discharging resistance 133 can be reduced substantially and the snubber circuit can be miniaturized.
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