Electric vehicle and vehicle-mounted charger, and method for controlling the same

A vehicle-mounted charger of an electric vehicle, comprising:

• an H bridge, comprising a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor;
• and
• a controller, configured to obtain a first total charging time (TA) for controlling the H bridge in a first manner, a second total charging time (TB) for controlling the H bridge in a second manner, a first total discharging time (TC) for controlling the H bridge in the first manner and a second total discharging time (TD) for controlling the H bridge in the second manner;
• to calculate a first total working time (Ttotal1) of the H bridge in the first manner according to the first total charging time (TA) and the first total discharging time (TC) and to calculate a second total working time (Ttotal2) of the H bridge in the second manner according to the second total charging time (TB) and the second total discharging time (TD);
• to select a manner for controlling the H bridge according to a relation between the first total working time (Ttotal1) and the second total working time (Ttotal2) to perform a temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor if the vehicle-mounted charger charges the power battery or if the power battery discharges via the vehicle-mounted charger.

An electric vehicle, comprising:

• a vehicle-mounted charger, comprising:
• an H bridge, comprising a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor;
• and
• a controller, configured to obtain a first total charging time (TA) for controlling the H bridge in a first manner, a second total charging time (TB) for controlling the H bridge in a second manner, a first total discharging time (TC) for controlling the H bridge in the first manner and a second total discharging time (TD) for controlling the H bridge in the second manner;
• to calculate a first total working time (Ttotal1) of the H bridge in the first manner according to the first total charging time (TA) and the first total discharging time (TC) and to calculate a second total working time (Ttotal2) of the H bridge in the second manner according to the second total charging time (TB) and the second total discharging time (TD);
• to select a manner for controlling the H bridge according to a relation between the first total working time (Ttotal1) and the second total working time (Ttotal2) to perform a temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor if the vehicle-mounted charger charges the power battery or if the power battery discharges via the vehicle-mounted charger.