Electric vehicle and its on-board charger and control method for the on-board charger

Abstract

The present disclosure provides an electric vehicle, a vehicle-mounted charger and a method for controlling the same. The method includes: obtaining a first predetermined discharging-period Tm for controlling the H bridge in a first manner and a second predetermined discharging-period Tn for controlling the H bridge in a second manner when the vehicle-mounted charger starts to charge a power battery of the electric vehicle; and performing an alternate control on the H bridge in the first manner or the second manner according to the first predetermined discharging-period Tm and the second predetermined discharging-period Tn, so as to perform a temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method of an on-board charger for an electric vehicle, an on-board charger for an electric vehicle, and an electric vehicle. Background technique [0002] With the commercialization of electric vehicles, on-board chargers for electric vehicles have become one of the important components of electric vehicles. [0003] Among them, there are many methods to make the vehicle discharge externally by controlling the on-board charger, and the off-grid inverter control method of single-phase H-bridge is mostly used in related technologies, and the off-grid inverter control method of single-phase H-bridge generally includes: Bipolar control method and unipolar control method. [0004] However, when the bipolar control method is used, the four switches in the H-bridge are all in high-frequency switching state, the switching loss is high, and the heat loss generated is ...

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Problems solved by technology

[0004] However, when the bipolar control method is adopted, the four switching tubes in the H bridge are in a high-frequency switching state, the switching loss is high, and the heat loss generated is relatively large; when the unipolar control method is adopted, although it can be Solve the heat loss of the switching tubes when the bipolar control method is adopted, but the four switching tubes in the H bridge are always controlled in a fixed way during the discharge process of the power battery. Some switching tubes in the H bridge need to be turned off with current, and the current The overheating problem of the switched off switch tube cannot be effectively solved

[0005] Therefore, regardless of the bipolar control method or the unipolar control method, the heating problem of the switch tube in the H bridge cannot be effectively solved, and the working life of the switch tube is affected.

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