| 摘要 |
A DC-to-AC converting circuit generates an alternating current by alternatel y switching a set of switching elements. The alternating current is supplied to a load Lo via an output filtering circuit. If a current detection resistor R1 in the DC-to-AC converting circu it detects an output current that exceeds a reference voltage Vref corresponding to an over-curre nt set value, certain switching elements are turned off to disconnect the DC-to-AC converting circuit from the power source. However, the DC-to-AC converting circuit continues to generate an alternating current from energy stored in one or more inductors that are coupled to the DC- to-AC converting circuit. Preferably, a closing circuit is formed from a diode, a switching element, the load Lo and the inductors. Thus, even if the DC-to-AC converting circuit is disconnected from its power source, an alternating current continuously flows to the load Lo.< /SDOAB>
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