| 摘要 |
PROBLEM TO BE SOLVED: To stop inverter control with reliability even if there is no zerocrossing signal or if there is a zero-crossing but a detected value is equal to or below a specified value, by stopping charging. SOLUTION: If a zero-crossing signal is detected, a charging current (current sensor detection value IB) is compared with a control target value IBref. The current sensor detection value IB is PWM-controlled through a control circuit 18. If power is externally supplied, therefore, the actual current value and the control target value Ibref are virtually equal to each other, and it is judged that charging is normally performed. If no zero-crossing signal is detected, it is judged that there is no supply of external power, and control on the inverter 14 is stopped and a relay 24 is also interrupted. There are cases where a zero-crossing signal is produced by the circulating power from other circuits. If there is no supply of external power, however, no current is passed by controlling the inverter 14, and the actual current value and the control target value Ibref are not virtually equal to each other. At this time, control is exercised so that charging is in a stop, and operation is kept in standby state until charging is started. |
