An active short circuit control circuit and control method

Abstract

The invention relates to an active short circuit control circuit and a control method. The active short circuit control circuit comprises a sensor, a bus current detection circuit, a main control chip and an active short-circuit circuit. The sensor is connected with the bus current detection circuit; the sensor comprises a current sensor and a voltage sensor; the bus current detection circuit is connected with an input port of the main control chip; and the main control chip is connected with the active short-circuit circuit through a main control chip port output module. Through improvement of the bus current detection circuit and the active short-circuit circuit as well as structure improvement of the active short-circuit circuit under the condition of failure of the main control chip, execution of active short-circuit control is realized.

Description

technical field [0001] The invention belongs to the technical field of motor controllers and safety systems, in particular to an active short-circuit control circuit and a control method. Background technique [0002] Under the background that low-carbon economy has become the mainstream of the times, electric vehicles have become the main direction of current automobile development. With the continuous development of electric vehicles, high-power motors and controllers have come out one after another. In the fault mode of the vehicle, especially in the case of high-speed faults, the reverse current of the bus bar will cause great damage to the battery pack and endanger the safety of the vehicle. In order to prevent such situations from happening, it is necessary to design an active short-circuit system to prevent overcharging. [0003] At present, the motor controller input used in new energy vehicles is generally a high-voltage system. In order to prevent damage to electr...

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Problems solved by technology

[0003] At present, the motor controller input used in new energy vehicles is generally a high-voltage system. In order to prevent damage to electronic components in the failure mode, the existing technical solution is to use the power off when a failure occurs, especially when the vehicle is running at high speed. The solution of components, but this solution will generate negative current and negative torque, which will charge the battery and cause damage to the battery

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