Electric vehicle motor controller active discharge control circuit

Abstract

The invention provides an active discharge control circuit of an electric vehicle motor controller, which belongs to the field of active discharge control circuits. The invention includes an active discharge logic circuit, a discharge circuit, a bus capacitor, a power inverter circuit, and a motor controller. The active discharge logic circuit sends out an active discharge switch drive signal to control the discharge circuit, and the bus power output ends are respectively connected to the The input end of the discharge circuit is connected to the input end of the bus capacitor, the input end of the power inverter circuit is connected to the output end of the discharge circuit and the output end of the bus capacitor, and the output end of the power inverter circuit is connected to the input end of the motor controller . The circuit of the invention is simple, safe and reliable, which not only satisfies the rapid and active discharge of the vehicle under the required discharge conditions, but also satisfies the excessively large DC back electromotive force of the busbar under the condition of high speed and no-load of the vehicle motor to prevent the active discharge circuit from being abnormally opened.

Description

technical field [0001] The invention relates to the field of active discharge control circuits, in particular to an active discharge control circuit for an electric vehicle motor controller. Background technique [0002] In recent years, permanent magnet synchronous motors have been widely used in pure electric vehicles and hybrid electric vehicles due to their fast torque response and high power density, and the drive control of motors has become a research hotspot. At the same time, high requirements are put forward for the high safety and reliability of the vehicle motor drive system. [0003] Considering the safety and reliability of the drive system, the active discharge system, on the one hand, according to the system requirements, automatically turns on the discharge and completes the basic functions when the active discharge conditions are met; The active discharge circuit will cause damage to the discharge circuit. For example, the resistors in the discharge circui...

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Problems solved by technology

[0003] Considering the safety and reliability of the drive system, the active discharge system, on the one hand, according to the system requirements, automatically turns on the discharge and completes the basic functions when the active discharge conditions are met; Active discharge circuit, causing damage to the discharge circuit, for example, the resistance in the discharge circuit will burn out due to long-term work, which will affect other system circuits and increase the risk of the motor drive system

[0004] In the prior art, a hardware switch is usually used to drive the discharge circuit to meet the discharge requirements. According to the system requirements, when the active discharge conditions are met, the discharge is automatically turned on, but under non-active discharge conditions, such as when the vehicle is going downhill or sliding at high speed , easy to misjudgment, start the discharge circuit

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