Patent ID: 8736233

Claim:
A power source device for supplying power to a load, an AC generator driven by an engine being a power source, three-phase AC output terminals leading from respective non-neutral point terminals of three-phase magneto coils in a star-shaped connection, and a neutral point terminal leading from a neutral point; the power source device comprising: rotational speed detecting means for detecting the rotational speed of the AC generator from the output of the AC generator; a first control rectifier circuit for performing full-wave rectification on three-phase AC voltages obtained from three-phase AC output terminals of the AC generator; a second control rectifier circuit for performing full-wave rectification on AC voltages obtained between the neutral point terminal and each of two-phase AC output terminals selected from the three-phase AC output terminals of the AC generator, as well as on AC voltage obtained between the selected two-phase AC output terminals; and a controller for controlling the first control rectifier circuit and the second control rectifier circuit so that the output of the first control rectifier circuit is supplied to the load when the rotational speed detected by the rotational speed detecting means is equal to or less than a set speed, and the output of the second control rectifier circuit is supplied to the load when the detected rotational speed exceeds the set speed.