Electric vehicle charger with over-temperature protection function

Abstract

The invention discloses an electric vehicle charger with the over-temperature protection function. The output current of the charger is reduced under the extreme high-temperature condition, and therefore the aim that the temperature inside the charger is reduced is achieved. The electric vehicle charger comprises an alternating current input end, a power-switching circuit and a charging output end. An over-temperature protection circuit is connected with the power-switching circuit. A temperature detection circuit is connected with the over-temperature protection circuit. The temperature detection circuit comprises a resistor R1, a resistor R3, a resistor R4, a thermistor RT and a diode D5. A power supply terminal VCC is connected with the resistor R1. The resistor R1 is connected with the thermistor RT in series to be connected with the ground. The resistor R3 is connected with the power supply terminal VCC and connected with the resistor R4 in series to be connected with the ground. The positive electrode of the diode D5 is connected to the series connection ends of the resistor R3 and the resistor R4. The negative electrode of the diode D5 is connected to the series connection ends of the resistor R1 and the thermistor RT. The electric vehicle charger with the over-temperature protection function has the advantages that the over-temperature protection function of the electric vehicle charger is achieved, the temperature can be automatically controlled in the extremely severe high-temperature environment, and safety use of the electric vehicle charger is guaranteed.

Description

technical field [0001] The invention relates to an electric vehicle charger with an over-temperature protection function. Background technique [0002] At present, ordinary chargers in the electric vehicle industry mostly rely on fans to dissipate heat. When the ambient temperature is extremely high or the fan is damaged, or the fan outlet is blocked, the temperature inside the charger will rise sharply. If effective measures are not taken in time, some heating devices will be damaged. The temperature is out of control and damaged, which eventually leads to the failure of the charger to charge normally. Contents of the invention [0003] The problem to be solved by the present invention is that when the ambient temperature is extremely high or the fan is damaged, or the fan outlet is blocked, the over-temperature protection is activated to reduce the output current of the charger so as to reduce the temperature inside the charger and make the temperature of the charger rea...

AI Technical Summary

Problems solved by technology

[0002] At present, ordinary chargers in the electric vehicle industry mostly rely on fans to dissipate heat. When the ambient temperature is extremely high or the fan is damaged, or the fan outlet is blocked, the temperature inside the charger will rise sharply. If effective measures are not taken in time, some heating devices will be damaged. The temperature is out of control and damaged, which eventually leads to the failure of the charger to charge normally

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