Patent ID: 6661110
Filing Date: 2003-12-09
Classification: H02M,H02P

Abstract:
A portable generator generating an AC voltage with an AC generator turned by an engine, rectifying this AC voltage by a thyristor-based rectifier circuit which serves as a DC-voltage-generating circuit to charge a DC-power-source unit which stores electric charge, converting the DC voltage, which is generated by charging the DC-power-source unit, into a single-phase AC voltage of a prescribed frequency and of a constant voltage by an inverter circuit; anda constant-voltage-control unit that controls to keep the DC voltage of the DC-power-source unit substantially constant by detecting the voltage at the DC-power-source unit and subsequently by controlling the continuity angle of thyristors in the DC-voltage-generating circuit, and that controls, to prevent the DC-power-source unit from dropping, by detecting the amperage flowing in the inverter circuit and subsequently by advancing the start of continuity establishment of the thyristors when the amperage flowing in the inverter circuit increases.