Electric vehicle, vehicle-mounted charger thereof and control method thereof

Abstract

The present invention discloses an electric vehicle, a vehicle-mounted charger thereof and a control method thereof. The vehicle-mounted charger includes a charging contactor, an H-bridge, a first voltage sampling module, a second voltage sampling module and a control module; the H-bridge includes two alternating-current ends and two direct-current ends, wherein the two direct-current ends are connected with a power battery, one of the two alternating-current ends is connected with the first end of an alternating-current power source through the charging contactor, the other alternating-current end is connected with the second end of the alternating-current power source; the first voltage sampling module is used for sampling the voltage of the alternating-current power source so as toobtain a first sampling voltage; the second voltage sampling module is used for sampling the voltage of the alternating-current ends of the H-bridge so as to obtain a second sampling voltage; and thecontrol module is used for controlling the H-bridge to perform inversion work when the alternating-current power source is connected with the vehicle-mounted charger, so that the phases of the secondsampling voltage and the first sampling voltage can be synchronized, and the amplitudes of the second sampling voltage and the first sampling voltage can be identical, and then, the control module controls the charging contactor to pull in and controls the H-bridge to perform rectification work, so that the alternating-current power source can charge the power battery.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an on-board charger of an electric vehicle, a control method of the on-board charger of an electric vehicle, and an electric vehicle. Background technique [0002] With the commercialization of electric vehicles, the on-board charging system of electric vehicles has become one of the important components of electric vehicles, and there are many charging methods for the on-board system of the whole vehicle. [0003] In the current car charger, in order to prevent the charging circuit from being damaged by the large current generated by connecting to the charging power supply, the pre-charging circuit including the pre-charging resistor is an essential part. However, the design of the pre-charging circuit including the pre-charging resistor undoubtedly makes the structure of the car charger more complicated and the cost is higher. In addition, the service life and effecti...

AI Technical Summary

Problems solved by technology

However, the design of the pre-charging circuit including the pre-charging resistance undoubtedly makes the structure of the car charger more complicated and the cost is higher. In addition, the service life and effectiveness of the pre-charging circuit will also affect the stability of the car charger.

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