Short-to-ground protection method, motor controller, and computer-readable storage medium

Abstract

The invention provides an earthing short circuit short-circuit protection method, a motor controller and a computer-readable storage medium. The short-circuit protection method comprises the followingsteps: when the motor controller is powered on, the phase of each phase / line voltage inputted into a controllable rectifying module in the motor controller is obtained. According to the phase of eachphase / line voltage, each semiconductor switch tube in the controllable rectifier module is controlled to start conduction when its corresponding phase / line voltage crosses a zero point, and the conduction angle of the semiconductor switch tube is gradually increased until the bus voltage of the motor controller reaches a preset threshold value. As that semiconductor switch transistor is controlled to conduct at the zero-crossing point of the phase voltage, the conduction width of the semiconductor switch transistor is gradually increased, and the bus voltage is slowly increased, the current flowing through the invert module when the load is short to ground is reduced, and the risk of device damage is reduced.

Description

Technical field [0001] The present invention relates to the field of power electronic equipment, and more specifically, to a ground short-circuit protection method, a motor controller and a computer-readable storage medium. Background technique [0002] The motor controller controls the AC motor to run in accordance with the set direction, speed, angle, response time, etc. by changing the frequency of the working power supply of the motor. In the above-mentioned motor controller, the current needs to be rectified to obtain direct current, and then inverted into alternating current of the required frequency to drive the motor to realize motor speed regulation. This control method is called AC-DC-AC, which is the current mainstream technology. [0003] Currently, in motor controllers using diode rectification or thyristor rectification topologies, the load short-circuit judgment is usually performed only after the system is powered on, and the inverter output side to ground short-ci...

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a short-to-ground protection method, a motor controller, and a computer-readable storage medium, aiming to solve the problem of possible damage during power-on caused by not considering the short-to-ground fault on the inverter output side in the above-mentioned rectification topology. system device problem

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