Hybrid Excitation Synchronous Motor Hardware Overvoltage Protection Circuit

Abstract

The invention provides a hardware overvoltage protection circuit of a hybrid excitation synchronous motor. The circuit comprises: a first MOS transistor circuit, a second MOS transistor circuit, an overvoltage detection circuit, an active short circuit and a gate drive circuit. In a normal working state, the gate driving circuit receives an excitation PWM signal provided by a pulse width modulation circuit to drive the first MOS transistor circuit to operate. The overvoltage detection circuit, when detecting an overvoltage, outputs an overvoltage signal to the active short circuit. The activeshort circuit outputs an active short circuit signal to the gate driving circuit. The gate driving circuit drives the first MOS transistor circuit according to the active short circuit signal. The hardware overvoltage protection circuit can realize the overvoltage protection of the hybrid excitation synchronous motor only by hardware, and is simple in structure, low in cost and high in reliability.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a hardware overvoltage protection circuit for a hybrid excitation synchronous motor. Background technique [0002] When applying a hybrid excitation synchronous motor, a fault occurs when the motor rotates at a high speed, which may cause overvoltage on the busbar and eventually cause system damage. Usually, an overvoltage protection circuit is required. The traditional overvoltage protection circuit also requires software to participate in judging whether the voltage is overvoltage. The circuit is more complicated, the cost is higher, and the reliability is not high. Contents of the invention [0003] Aiming at the defects in the prior art, the object of the present invention is to provide a hardware overvoltage protection circuit for a hybrid excitation synchronous motor. [0004] A hybrid excitation synchronous motor hardware overvoltage protection circuit provi...

AI Technical Summary

Problems solved by technology

[0002] When applying a hybrid excitation synchronous motor, when the motor rotates at a high speed, a fault may occur, which may cause busbar overvoltage and eventually cause system damage

Usually, an overvoltage protection circuit is required. The traditional overvoltage protection circuit also requires software to participate in judging whether the voltage is overvoltage. The circuit is more complicated, the cost is higher, and the reliability is not high.

Images