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Vehicle-mounted direct current motor driving chip overcurrent protection system

A technology of motor drive chips and drive chips, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problems of increasing maintenance costs, achieve high immediacy, improve protection mechanisms, and improve use reliability effect

Inactive Publication Date: 2016-03-23
ATECH AUTOMOTIVE WUHU
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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

Method used

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  • Vehicle-mounted direct current motor driving chip overcurrent protection system
  • Vehicle-mounted direct current motor driving chip overcurrent protection system

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Embodiment Construction

[0011] In actual use, the load current beyond the acceptable range is often one of the main reasons for the damage of the motor driver chip. Although the driver chip generally has its own over-current protection mechanism, most of them are based on the large current flowing through the MOS inside the driver chip. The heat generated by the tube is used for protection. Such a protection mechanism needs to wait until the MOS tube has accumulated enough heat to start, lacking immediacy, and this "overheating" protection mechanism will also affect the service life. In view of this situation, this system adopts additional current monitoring circuit and over-current response circuit on the periphery of the drive chip to constantly monitor the current flowing through the motor drive chip. When the current exceeds the set range, the over-current response circuit starts and cuts off immediately. The motor drives the chip input, cuts off the current, and realizes the protection function. ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 陈泽坚
Owner ATECH AUTOMOTIVE WUHU
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