Electric car and car-mounted charger thereof, and control method of car-mounted charger

Abstract

The invention discloses an electric car and a car-mounted charger thereof, and a control method of the car-mounted charger. The control method includes the following step: acquiring the charge set time Tx that an H bridge is controlled in a first manner and the charge set time Ty that the H bridge is controlled in a second manner when a power battery is charged; alternatively controlling the H bridge according to the Tx and the Ty so as to perform temperature equalization control on a first to a fourth switch tubes; acquiring the discharge set time Tm that the H bridge is controlled in the first manner and the discharge set time Tn that the H bridge is controlled in the second manner; and alternatively controlling the H bridge according to the Tm and the Tm so as to perform temperature equalization control on the first to the fourth switch tubes. In this way, heat of the first to the fourth switch tubes in the H bridge is relatively balanced, and the service life of the switch tubes in the H bridge can be prolonged.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method of an electric vehicle on-board charger, an electric vehicle on-board charger and an electric vehicle. Background technique [0002] With the commercialization of electric vehicles, the electric vehicle on-board charger has become one of the important components of electric vehicles. [0003] Among them, there are many methods of charging and discharging the vehicle by controlling the on-board charger, and most of the related technologies adopt the control method of single-phase H-bridge, and the control method of using single-phase H-bridge generally includes bipolar polarity control method and unipolar control method. [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 unipol...

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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 charging or discharging process of the vehicle, and some switching tubes in the H bridge need to be turned off with current. The overheating problem of the switching tube with current shutdown 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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