Charger

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.