The invention relates to the technical field of new energy of electric vehicles, in particular to a protection method and device for a direct current charger. According to the scheme, when it is detected that the direct-current charger is successfully connected with the battery charging interface, if it is detected that the contact resistance value of the direct-current charger and the battery charging interface is larger than a set resistance value, it is judged that the charging interface is invalid, and if it is detected that the absolute value of the voltage difference is larger than a set voltage difference value, it is judged that the direct-current charger has a short-circuit fault. And after a fault is detected, the connection between the direct-current charger and the battery charging interface is disconnected. According to the scheme, the contact resistance value and the voltage difference are detected in real time, the charging fault type can be rapidly and accurately detected in a quantitative comparison mode, connection between the direct-current charger and the battery charging interface is disconnected in time after the charging fault is detected, the detection process is simple and reliable, and the detection efficiency is improved. And the sensitivity of protecting the direct-current charger can be improved.
本发明涉及电动汽车新能源技术领域,特别是涉及一种直流充电机的保护方法及装置。方案包括当检测到直流充电机与电池充电接口连接成功时,若检测到直流充电机与电池充电接口的接触阻值大于设定电阻值,则判定为充电接口失效,若检测到电压差的绝对值大于设定电压差值,则判定为直流充电机发生短路故障,检测出故障后就断开直流充电机与电池充电接口的连接。本方案通过实时检测上述接触阻值和上述电压差,能够以定量比较的方式快速且准确地检测出充电故障类型,并在检测出充电故障后及时断开直流充电机与电池充电接口的连接,检测过程不仅简单可靠,而且能够提高保护直流充电机的灵敏度。
Protection method and device for direct current charger
一种直流充电机的保护方法及装置
2024-05-07
Patent
Electronic Resource
Chinese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen |
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