The invention relates to the technical field of electric vehicle charger protection, in particular to a temperature protection circuit for an electric vehicle charger, which comprises a chip, a single chip microcomputer U1, a circuit VCC, a time constant RC, an FB magnetic bead, a first resistor R1, a second resistor R2 , a triode Q2 and a transformer T. The chip comprises an output end OUTand a data signal IN, one end of the second resistor R2 is connected with a second zero line GND2, one end of the chip is connected with a first null line GND1, one end of the triode Q2 is connected with the FB magnetic bead, and the other end of the triode Q2 is connected with a third null line GND3. According to the invention, the triode Q2 is arranged in the circuit, so that the change of the internal temperature of the charger can be detected, and when the temperature of the circuit exceeds a set value, the chip and the time constant RC turn off and adjust the conduction time of the triode Q2, so that the temperature of the charger is reduced, and the damage of components in the charger caused by high temperature is reduced; and the burnout of the charger and the occurrence of safety accidents are well avoided.
本发明涉及电动车充电器保护技术领域,尤其涉及一种用于电动车充电器的温度保护电路,包括芯片、U1单片机、VCC电路、RC时间常数、FB磁珠、R1第一电阻、R2第二电阻、Q2三极管和T变压器,所述芯片包括OUT输出端和IN数据信号,R2第二电阻的一端连接有GND2第二零线,芯片的一端连接有GND1第一零线,Q2三极管的一端与FB磁珠连接,Q2三极管的另一端与GND3第三零线连接。本发明中,通过在电路中设置Q2三极管可以检测充电器内部温度的变化,当电路温度超过设定的数值时,芯片与RC时间常数对Q2三极管的导通时间进行关断及调整,使得充电器的温度降低,减少了充电器内元器件因高温造成损坏,很好的避免了充电器烧毁及安全事故的发生。
Temperature protection circuit for electric vehicle charger
一种用于电动车充电器的温度保护电路
2021-12-28
Patent
Electronic Resource
Chinese
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