Detection device for quick protection triggering of short circuit of electric automobile circuit

Abstract

The invention discloses a detection device for quick protection triggering of short circuit of an electric automobile circuit. The device comprises an operational amplifier U1, an inverter U3 and an SR trigger U2. The positive phase input end of the operational amplifier U1 is connected with one end of a resistor R3 and one end of a resistor R4. The other end of the resistor R3 is connected with reference voltage; the resistor R4 is grounded; the normal-phase power supply end of the operational amplifier U1 is connected with reference voltage, and the reverse-phase power supply end thereof isgrounded. The output end of the operational amplifier U1 is connected with one end of a resistor R2; the other end of the resistor R2 is connected with one end of the resistor R1 and an S pin of the SR trigger U2; and the other end of the resistor R1 is grounded. An output pin of the inverter U3 is connected with an R pin of the SR trigger U2, a power supply pin is connected with an external powersupply voltage VCC, and a ground wire pin is grounded. The detection device has faster response time and higher trigger efficiency, and can trigger a protection circuit in a short time to cut off a circuit breaker switch.

Description

technical field [0001] The invention belongs to the technical field of electronic safety of new energy vehicles, and in particular relates to a trigger and detection device for rapid protection of electric vehicle circuit short circuits. Background technique [0002] With the development of new energy vehicles faster and faster, cars can not only run, but also more functions have been developed and applied. As a result, the electrical system of the car is becoming more and more complex, and the load on the electrical system is also increasing. The electrical system The types and frequency of failures are increasing. The intelligent detection and early warning circuit breaker of traditional new energy vehicles can also play a short-circuit protection role. However, when a circuit fault occurs, the working capacity of the contact of the intelligent detection and early warning circuit breaker increases, resulting in an increase in the arc energy generated when the contact is br...

AI Technical Summary

Problems solved by technology

The intelligent detection and early warning circuit breaker of traditional new energy vehicles can also play a short-circuit protection role. However, when a circuit fault occurs, the working capacity of the contact of the intelligent detection and early warning circuit breaker increases, resulting in an increase in the arc energy generated when the contact is broken, and the combustion The arc time becomes longer, which will cause the contacts to burn out and reduce the service life, increasing the chance of spontaneous combustion of the automotive circuit

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