Patent ID: 8421422

Claim:
A power supply device, comprising: a magneto generator, which includes: a rotor including a magnet forming a magnetic field; and a stator which generates an alternating current in stator windings by rotation of the rotor; a rectifying unit which rectifies the alternating current generated by said magneto generator to a direct current, and supplies electric power to an electrical load; a voltage detection unit which detects a voltage of the electrical load; opening means for interrupting electrical conduction of an output end of said magneto generator; short-circuiting means for electrically short-circuiting the output end of said magneto generator; a torque supplying device which supplies torque to the rotor of said magneto generator; a voltage control unit which selectively performs one of opening control of controlling on/off switching of said opening means and short-circuit control of controlling on/off switching of said short-circuiting means, to thereby control the voltage of the electrical load to a predetermined value in accordance with the voltage detected by said voltage detection unit; and a switching control unit which switches and controls between the opening control and the short-circuit control in accordance with an operating state regarding the rotation of the rotor of said magneto generator.