The invention provides a vehicle-mounted charger and a pre-charging method thereof.The pre-charging method comprises the steps that firstly, a bus side conversion circuit and a high-voltage side conversion circuit in the vehicle-mounted charger are controlled to be started; then, the high-voltage side conversion circuit and the bus side conversion circuit are controlled to operate reversely, and a bus capacitor between the positive electrode and the negative electrode of a direct-current bus in the vehicle-mounted charger is pre-charged; until the voltage on the bus capacitor reaches the preset voltage, the bus side conversion circuit and the high-voltage side conversion circuit are controlled to stop running; therefore, the pre-charging function of the bus capacitor is realized, a pre-charging resistor in the prior art does not need to be arranged in the vehicle-mounted charger, and the increase of the volume and the cost is avoided; moreover, after a pre-charging resistor is omitted, a power-off protection function can be realized by cutting off the relay under an abnormal condition.
本申请提供一种车载充电机及其预充电方法,该预充电方法,首先控制车载充电机中的母线侧变换电路和高压侧变换电路启动;然后,控制高压侧变换电路和母线侧变换电路反向运行,向车载充电机中直流母线正负极之间的母线电容进行预充电;直至母线电容上的电压达到预设电压,再控制母线侧变换电路和高压侧变换电路停止运行;进而实现对于母线电容的预充电功能,使车载充电机中无需设置现有技术中的预充电阻,避免了体积和成本的增加;而且,省略了预充电阻之后,可以在异常情况下通过切断继电器来实现断电保护功能。
Vehicle-mounted charger and pre-charging method thereof
一种车载充电机及其预充电方法
2023-09-01
Patent
Elektronische Ressource
Chinesisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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