Battery charger for electric vehicle, and rescue vehicle

A battery charger for an electric vehicle provided with a generator function unit including a generator and a generator control unit;

• the generator comprising;
• a rotor driven by a vehicle engine, on which a permanent magnet that generates a fixed magnetic field with a constant intensity and an electromagnet that generates a magnetic field with an intensity in accordance with a supply current are disposed so as not to interfere the two magnetic fields;
• and
• a stator fitted with stator coils, on which rotating magnetic fields generated by the permanent magnet and electromagnet of said rotor act simultaneously;
• the generator control unit comprising;
• rectifier means that converts alternating current produced in the stator coils of the stator to direct current;
• generator voltage detection means that detects a voltage of a direct current rectified by said rectifier means, and
• generator control means, when a generator voltage detected by the generator voltage detection means is lower than a predetermined prescribed value, carrying out voltage increase control by supplying the electromagnet field coil with a forward current that produces in the electromagnet magnetic flux having a same orientation as magnetic flux of the permanent magnet, and stopping the forward current when the generator voltage detected by the generator voltage detection means reaches a default value, and when the generator voltage detected by the generator voltage detection means is higher than a predetermined prescribed value, carrying out voltage decrease control by supplying the electromagnet field coil with a reverse current that produces in the electromagnet magnetic flux having a reverse orientation to that of the magnetic flux of the permanent magnet, and stops the reverse current when the generator voltage detected by the generator voltage detection means reaches the default value;
• and
• the generator function unit being connected by feeder line to the electric vehicle to be charged for obtaining charge data and charging the electric vehicle battery by supplying electric power maintained at a charge voltage and charging current that form an appropriate charging environment in accordance with the charge data.