| 摘要 |
Generator output specifications according to destination are satisfied by an alternator with a single output band and a generator output voltage is made automatically adjustable in accordance with a load. An engine generator 1 includes an alternator 3, a rectifier 51, a DC-DC converter 52, and an inverter 53. A comparing unit 12 compares an output voltage of the alternator 3 with a reference. The DC-DC converter 52 decreases voltage if the output voltage of the alternator 3 is greater than the reference, and the DC-DC converter 52 increases voltage if the output voltage of the alternator 3 is less than the reference. The DC-DC converter 52 is PWM controlled at an intermediate duty ratio when the output voltage of the alternator 3 is equal to the reference, a duty ratio is increased from the intermediate value, and the duty ratio is decreased from the intermediate value.
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