Power supply device

A power supply device comprising:

• a magneto generator that is formed of a rotor having a magnet that creates a magnetic field and a stator generating an AC at a stator winding by a rotation of the rotor;
• a torque supplying device that supplies torque to the rotor of the magneto generator;
• a rectifier circuit that supplies electric power to a electrical load device by rectifying the AC generated by the magneto generator to a DC;
• a short circuit that has an ON-and-OFF controllable switching element and electrically shorts an output end of the magneto generator when the switching element is switched ON;
• a voltage detection circuit that detects a terminal voltage of the electrical load device;
• and
• a control circuit that controls a voltage of the electrical load device to be a first set value by ON and OFF control on the switching element of the short circuit according to the voltage detected by the voltage detection circuit,
• wherein the control circuit performs control by making a switching between the rectifier circuit and the short circuit according to a operating state relating to the rotation of the rotor of the magneto generator, receives an input of a signal indicating a rpm on a side of the rotor as the operating state relating to the rotation of the rotor of the magneto generator, and on the basis of switching control information containing switching information indicating a relation of the rpm on the side of the rotor with respect to a magnitude relation of an input torque to the magneto generator from the torque supplying device between a short operating mode in which the short circuit is ON and a rectification operating mode in which the short circuit is OFF, makes a switching according to the rpm on the side of the rotor to one of the operating modes in which the input torque to the magneto generator is smaller.