Electric vehicle driving motor temperature acquisition and over-temperature protection circuit and motor

Abstract

The invention discloses an electric vehicle driving motor temperature acquisition and over-temperature protection circuit and a moto. The circuit comprises a voltage division circuit which is used foracquiring a voltage analog signal of a thermistor, and also comprises a voltage follower circuit and a controller unit MCU circuit, wherein an output end of the voltage division circuit is connectedwith the input end of the voltage follower circuit, the voltage follower circuit processes a voltage analog signal, the output end of the voltage follower circuit is connected to the controller unit MCU circuit, and the controller unit MCU circuit processes the voltage analog signal to judge whether the temperature of the motor is over-high or not and outputs a protection control signal. The voltage follower circuit is used for buffering and isolating the acquired voltage signal corresponding to the temperature, the interference on the analog voltage signal is shielded, a good analog voltage signal can be obtained, and reliability of data is ensured, so a data basis is provided for subsequent over-temperature protection operation.

Description

technical field [0001] The invention relates to the technical field of electric vehicle protection, in particular to a temperature acquisition and over-temperature protection circuit and a motor of a driving motor of an electric vehicle. Background technique [0002] With the development of the new energy electric vehicle industry, the speed and mileage requirements of pure electric vehicles are getting higher and higher, which has higher requirements for the temperature and heat dissipation of the motor, which requires real-time monitoring of the temperature of the motor. In order to prevent the motor temperature from being too high, it will damage the motor and affect the use of the entire electric vehicle. Now generally, the temperature resistance signal collected by the PTC thermistor is divided in series with other resistors to generate a voltage analog signal, and then the voltage analog signal is amplified by the amplification unit, and finally, A / D conversion is perf...

AI Technical Summary

Problems solved by technology

Now generally, the temperature resistance signal collected by the PTC thermistor is divided in series with other resistors to generate a voltage analog signal, and then the voltage analog signal is amplified by the amplification unit, and finally, A / D conversion is performed and provided to the control Processed by the MCU of the device unit, the voltage analog signal is prone to interference during the transmission and amplification process, resulting in misidentification by the MCU

Similarly, the over-temperature protection of the motor is also judged by the controller unit MCU itself. There are many strategies for the program operation and execution of the controller unit MCU itself. In some special cases, the controller unit MCU is likely to be unable to perform protection actions.

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