Active bleeder circuit of motor controller for electric car and control method thereof

Abstract

The invention provides an active bleeder circuit of a motor controller for an electric car and a control method thereof. The active bleeder circuit has the advantages of high reliability, safe and high space utilization rate and the active bleeder circuit is convenient for maintenance. The active bleeder circuit comprises a motor controller and a support capacitor of the motor controller, wherein a negative terminal of the support capacitor is in a ground connection. The capacitor is in parallel connection with a series circuit formed by series connection of a first resistor and a second resistor, wherein the contact point of the first resistor and the second resistor is connected with a control terminal of a bleeder switch. A positive terminal of the support capacitor is connected with a current input terminal of the bleeder switch by a bleeder resistor, wherein a current output terminal of the bleeder switch is connected with a negative terminal of the support capacitor. The motor controller possesses a first signal output pin, wherein the first signal output pin is connected with a control terminal of a control switch by a first isolation drive circuit, and an output signal output terminal of the control switch is connected with the control terminal of the bleeder switch.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle motor drive, and in particular relates to an active discharge circuit of a motor controller for an electric vehicle and a control method thereof. Background technique [0002] With the global oil resources becoming increasingly tense and environmental pollution becoming more and more serious, various energy-saving and environmentally friendly new energy vehicles are emerging, especially electric vehicles and hybrid vehicles are attracting more and more people's attention and ignorance, which is mainly due to the Breakthroughs in new energy, new materials, high-performance microprocessor technology, and large-capacity power battery technology have given people a new understanding of electric vehicles / hybrid vehicles. At the same time, the acceptance of electric vehicles has been greatly improved. People Already willing to buy electric vehicles as a means of transportation. [0003] In an ...

AI Technical Summary

Problems solved by technology

At present, the more advanced energy discharge circuits adopt active discharge, but the discharge circuit is complex and the cost is high; the circuit itself cannot monitor its own state, and once the system fails or the discharge circuit device is damaged, it cannot realize self-diagnosis, thus giving The maintenance of the motor controller is inconvenient

Due to the particularity of the working conditions of electric vehicles, the current active discharge circuit still has problems such as occupying a large space and being unable to handle abnormal conditions.

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