Engine driven generator.

摘要

An engine driven generator having an engine (1), a three-phase sysnchronous generator (3) to be driven by the engine (1), a direct current power supply (15) for actuating the engine (1), a direct current/alternating current power supply converter (13) for converting a direct current power of the direct current power supply (15) to an alternating current power and supplying the alternating current power to the three-phase synchronous generator (3): (1) characterized in further comprising a full-wave rectifier (11) for rectifying an output of the three-phase generator (3) and supplying the thus rectified output to the direct current/alternating current power converter (13); a switching unit (12) for switching output terminals of the direct current/alternating current power converter (13) to terminals of an outer device or output terminals of the synchrnous generator (3); a rotor position detector (10) for detecting a position of rotor of the synchronous generator (3); and (2) characterized in that during the period when the three-phase synchronous generator (3) performs the power generating operation after completing the actuation of the engine (1), a pair of positive and negative first single- phase switching elements are subjected to successive ON/OFF control operation while one pair of two-phase switching elements and the other pair of two-phase switching elements are alternated for each half of the time and subjected to PWM control operation so that output terminals corresponding to the two-phase switching elements are short-circuited with each other. 0