Monitoring circuit of 12V voltage in electric vehicle electric drive controller

Abstract

The invention discloses a monitoring circuit of 12V voltage in an electric vehicle electric drive controller. The monitoring circuit is characterized by comprising a voltage reference setting circuit which is used for setting an overvoltage threshold and an undervoltage threshold of the 12V voltage; a voltage comparison circuit which divides voltage of a 12V storage battery to obtain a voltage detection signal, then compares the voltage detection signal with the overvoltage threshold and the undervoltage threshold, and outputs a low electrical level fault signal when the voltage detection signal exceeds the overvoltage threshold or the undervoltage threshold; and an optical coupler isolation circuit which converts an electrical level of the low electrical level fault signal output by the voltage comparison circuit in isolation, then obtains an electrical level signal compatible with a digital signal processor (DSP) main control chip, and transmits the electrical level signal to the DSP main control chip. The monitoring circuit outputs the low electrical level fault signal when storage battery voltage is over or below given thresholds, and transmits the low electrical level fault signal to the DSP main control chip so as to obtain protection for a controller.

Description

technical field [0001] The invention relates to a 12V input voltage monitoring circuit applied in an electric vehicle electric drive controller. Background technique [0002] In the electric vehicle controller, the power required by all the chips is converted from the 12V lead-acid battery of the vehicle through DC / DC conversion. If the 12V voltage of the lead-acid battery is unstable, it will directly affect the control circuit of the controller. Normal work, and then affect the performance of the vehicle, resulting in hidden dangers to driving safety. Therefore, the 12V voltage must be monitored in real time. Once overvoltage or undervoltage, the fault signal should be transmitted to the DSP main control chip immediately, so that the main control chip can take corresponding actions to protect the normal working performance of the electric vehicle electric drive controller. However, so far there is no public report about the 12V voltage monitoring circuit in the electric d...

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Problems solved by technology

However, so far there is no public report on the 12V voltage monitoring circuit in the electric vehicle electric drive controller

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