| 主权项 |
1. A system for charging a battery in an electric vehicle comprising:
a. a battery, the battery having a master switch coupled to a second terminal of the battery; b. a heater for heating a battery during a pre-charging phase; c. an on board charger coupled to a first terminal of the battery through a first switch; d. an off board charger coupled to the first terminal of the battery through a second switch; e. a DC to DC converter coupled to the heater and to the first terminal of the battery through a third switch, wherein the DC to DC converter is also coupled to the on board charger through the third switch and first switch and to the off board charger through the third switch and second switch; f. a temperature sensor for sensing a temperature of the battery; and g. a controller for receiving the temperature of the battery, wherein the controller is coupled to the master switch, first switch, second switch, and third switch, wherein during a pre-charging phase, the controller opens the master switch, closes the third switch and one of the first switch and second switch thereby electrically isolating the battery while coupling the DC to DC converter to one of the on board charger and off board charger for providing power to the heater, and wherein in a charging phase, the controller closes the master switch, opens the third switch, and closes one of the first switch and second switch, thereby forming an electrical path from one of the on board charger and off board charger to the battery. |
