Vehicle-mounted direct current motor driving chip overcurrent protection system

Abstract

The invention discloses a vehicle-mounted direct current motor driving chip overcurrent protection system. A motor driving chip and a microcontroller are powered by a power supply; the microcontroller outputs a control signal to the motor driving chip to control the operation of the motor; an operation loop of the motor is connected with a sampling resistor in series; the sampling resistor converts a current signal in the loop into a voltage signal; the current signal is amplified through an amplifier and then the amplified current signal is output to an overcurrent response circuit; and the overcurrent response circuit controls the on-off of the signal transmitted to the motor driving chip from the microcontroller. The vehicle-mounted direct current motor driving chip overcurrent protection system has the advantage of quite high instantaneity; the response time of the whole system is within 10uS from the moment that the sampling resistor samples the overcurrent signal to the moment that the overcurrent response circuit stably outputs; and therefore, the protection mechanism of the motor driving chip is perfected to a large extent, and the reliability of the motor driving chip in use is improved.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to an overcurrent protection system for a vehicle-mounted DC motor drive chip. Background technique [0002] At present, with the continuous expansion and improvement of my country's automobile industry, the DC motors used in automobiles have also shifted from traditional relay control to highly integrated driver chip control. There are many advantages, but the disadvantages are gradually exposed. For example, when the drive system of the vehicle motor is damaged, the traditional relay control method may only need to replace the damaged relay, but for the driver chip control method, it is necessary to replace the driver. The entire control module where the chip is located means that the maintenance cost is greatly increased. Therefore, in general, the driving system of the vehicle motor needs to have high reliability and the self-protection function is very perfect. Contents of...

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Problems solved by technology

[0002] At present, with the continuous expansion and improvement of my country's automobile industry, the DC motors used in automobiles have also shifted from traditional relay control to highly integrated driver chip control. There are many advantages, but the disadvantages are gradually exposed. For example, when the drive system of the vehicle motor is damaged, the traditional relay control method may only need to replace the damaged relay, but for the driver chip control method, it is necessary to replace the driver. The entire control module where the chip is located means that the maintenance cost is greatly increased, so in general, the drive system of the vehicle motor needs to have high reliability, and the self-protection function is very perfect

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