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 discharging time (TC) for controlling the H bridge in a first manner and a second total discharging time (TD) for controlling the H bridge in a second manner when a power battery starts to discharge via the vehicle-mounted charger;
• to obtain a first discharging predetermined time (Tm) for controlling the H bridge in the first manner and a second discharging predetermined time (Tn) for controlling the H bridge in the second manner;
• to select a manner for controlling the H bridge according to a relation between the first total discharging time (TC) and the second total discharging time (TD);
• and to perform an alternate control on the H bridge in the first manner or the second manner according to the first discharging predetermined time (Tm) and the second discharging predetermined time (Tn) to perform temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor,
• wherein the first discharging predetermined time (Tm) and the second discharging predetermined time (Tn) are preset for each discharging cycle of a discharging process of the power battery.

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 discharging time (TC) for controlling the H bridge in a first manner and a second total discharging time (TD) for controlling the H bridge in a second manner when a power battery starts to discharge via the vehicle-mounted charger;
• to obtain a first discharging predetermined time (Tm) for controlling the H bridge in the first manner and a second discharging predetermined time (Tn) for controlling the H bridge in the second manner;
• to select a manner for controlling the H bridge according to a relation between the first total discharging time (TC) and the second total discharging time (TD);
• and to perform an alternate control on the H bridge in the first manner or the second manner according to the first discharging predetermined time (Tm) and the second discharging predetermined time (Tn) to perform temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor,
• wherein the first discharging predetermined time (Tm) and the second discharging predetermined time (Tn) are preset for each discharging cycle of a discharging process of the power battery.