Battery charger for electric vehicle, and rescue vehicle
View Patent ↗A generator driven by the driving force of a vehicle traction engine has permanent magnets and electromagnets arranged in tandem on a rotor, the magnetic field of the permanent magnet and the magnetic field of the electromagnet act independently on stator coils of a stator, forming a high-power unit controlled by a generator control unit that, when the output of the generator is lower than a prescribed value, flows forward current through the field coils to generate a magnetic field having the same orientation as the magnetic field due to the permanent magnet, and when the output of the generator is higher than a prescribed value, passes a reverse current through the field coils that generates a magnetic field having an opposite orientation to that of the magnetic field due to the permanent magnet, forming an alternating current having a prescribed value. The alternating current output is rectified.
1. 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.
2. The battery charger for an electric vehicle according to claim 1 , wherein the generator function unit constantly monitors charge voltage and charge current going to the electric vehicle battery during charging operations, and immediately stops supplying electricity to the battery if an abnormal condition arises in which a monitored value exceeds an upper-limit charge voltage or charge current predetermined as an appropriate charging environment.
3. The battery charger for an electric vehicle according to claim 1 , wherein the generator control unit carries out a prior calculation of the time required to fully charge the electric vehicle and stops the charging operation when said time from charging operation initiation has elapsed.
4. The battery charger for an electric vehicle according to claim 1 that includes an auxiliary battery that can be charged using power generated by said generator.
5. The battery charger for an electric vehicle according to claim 4 , wherein the auxiliary battery can be charged from an external commercial power supply.
6. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 1 .
7. The battery charger for an electric vehicle according to claim 2 , wherein the generator control unit carries out a prior calculation of the time required to fully charge the electric vehicle and stops the charging operation when said time from charging operation initiation has elapsed.
8. The battery charger for an electric vehicle according to claim 2 that includes an auxiliary battery that can be charged using power generated by said generator.
9. The battery charger for an electric vehicle according to claim 3 that includes an auxiliary battery that can be charged using power generated by said generator.
10. The battery charger for an electric vehicle according to claim 7 that includes an auxiliary battery that can be charged using power generated by said generator.
11. The battery charger for an electric vehicle according to claim 8 , wherein the auxiliary battery can be charged from an external commercial power supply.
12. The battery charger for an electric vehicle according to claim 9 , wherein the auxiliary battery can be charged from an external commercial power supply.
13. The battery charger for an electric vehicle according to claim 10 , wherein the auxiliary battery can be charged from an external commercial power supply.
14. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 2 .
15. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 3 .
16. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 4 .
17. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 5 .
18. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 7 .
19. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 8 .
20. A rescue vehicle equipped with the battery charger for an electric vehicle according to claim 9 .