Patent ID: 8912750

Claim:
A charger comprising: a motor having a Y-connection; a rectifier configured to rectify an alternating current power and output the rectified power to a neutral point of the motor; a rectifier/inverter configured to charge output power of the rectifier in a first battery in a charging mode and drive the motor by switching the charged power in the first battery in a drive mode; a first controller configured to control the rectifier and rectifier/inverter to charge the first battery in the charging mode; and a second controller configured to control the rectifier/inverter to drive the motor in the drive mode and to control the first controller to charge the first battery in the charging mode, wherein the rectifier includes: first diodes configured to bridge-rectify the alternating current power; a switching device configured to switch output power of the first diodes to the neutral point of the motor under control of the first controller; a filter configured to filter the alternating current power and to output the filtered power to the first diodes; and a second diode configured to form a closed loop when the rectifier/inverter charges the output power in the first battery, and wherein the first controller includes: a first detector configured to detect a charging state of the first battery; a first generator configured to generate a charging reference voltage using an output of the first detector and the first diodes; a second detector configured to detect a charging current of the first battery output from the rectifier; and a second generator configured to generate a switching signal according to an output of the first generator and second detector and to output the switching signal to the rectifier and the rectifier/inverter.