Power battery pre-charging switch device based on IGBT module

Abstract

The invention discloses a power battery pre-charging switch device based on an IGBT module. The power battery pre-charging switch device is used for controlling the on / off of a pre-charging branch circuit of a power battery. The power battery pre-charging switch device comprises a low-voltage auxiliary power supply, a microcontroller, a low-voltage control circuit, a disconnector power supply, a gate drive circuit and the IGBT module, wherein the IGBT module is connected in the pre-charging branch circuit; the low-voltage auxiliary power supply is connected to the disconnector power supply through the low-voltage control circuit, and suitable for providing a low-voltage power supply to the disconnector power supply; the microcontroller is connected to the low-voltage control circuit, and suitable for controlling the on / off of the low-voltage control circuit; the disconnector power supply is connected to the gate drive circuit; and the gate drive circuit is connected to the IGBT module.The power battery pre-charging switch device based on the IGBT module uses the IGBT module as an execution switch so as to not only enhance the real-time performance of the pre-charging switch operation but also reduce the requirement on the driving capability of the microcontroller. In addition, the power battery pre-charging switch device has good electromagnetic compatibility, and also has thedevelopment advantages of miniaturization, low cost and the like.

Description

technical field [0001] The invention relates to a power battery precharging switch device based on an IGBT module. Background technique [0002] With the continuous development of new energy technology, the use of electric vehicles has become more and more common. Different from the characteristics of traditional automobiles that use internal combustion engine as their power source, electric vehicles use electric motors as their power source. Before the motor runs, it needs to go through a power-on start-up stage. Since there are many large capacitors at the input end of the motor, in order to effectively suppress the transient current in the power-on stage of the motor and enhance the electrical safety characteristics of the energy storage system, it is necessary to control the power on the motor. The most commonly used control method is the pre-charging method. This method refers to firstly closing a pre-charging branch circuit including a current-limiting resistor in th...

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Problems solved by technology

[0003] In the traditional method, a high-voltage relay is used to switch the on-off state of the pre-charging branch. Although the high-voltage relay has good withstand voltage insulation characteristics when it is disconnected, it still has the disadvantages of slow response speed and long delay in execution. ; High-voltage relays consume a lot of energy when performing switching actions, and most controllers have small output currents, which cannot directly drive high-voltage relays to perform switching actions, and additional auxiliary circuits are needed to enhance their driving capabilities; Strong electromagnetic interference and poor electromagnetic compatibility; high-voltage relays are bulky and expensive, and are not conducive to the miniaturization and cost reduction of these electrical devices when they are used in components such as battery disconnecting units and power distribution boxes of electric vehicles Improve

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