Pulse-by-pulse current limiting protection method, device and motor controller

Abstract

The invention discloses a pulse-by-pulse current limiting protection method, a pulse-by-pulse current limiting protection device and a motor controller. The pulse-by-pulse current limiting protectionmethod includes the following steps that: whether a pulse-by-pulse current limiting threshold is triggered is detected in real time during a process of outputting PWM signals sent by a DSP (Digital Signal Processing) unit; when it is detected that the pulse-by-pulse current limiting threshold is triggered, the output of the PWM signals which are being outputted is stopped, at the same time, feedback signals are sent to the DSP unit to notify the DSP unit to stop performing PI adjustment on the PWM signals; and when it is detected that the pulse-by-pulse current limiting threshold is no longertriggered, the output of the PWM signals is resumed. According to the pulse-by-pulse current limiting protection method of the invention, when the PWM signals are sealed, the adjustment control of thePWM signals by a controller is stopped, and therefore, the PWM signals can maintain an original state; after motor overcurrent disappears, the normal output of the PWM signals is enabled; and since the DSP does not perform control adjustment, overshoot in the control of the PWM signals is effectively suppressed, and secondary overcurrent can be avoided.

Description

technical field [0001] The invention relates to the field of motor controllers, in particular to a wave-by-wave current limiting protection method, device and motor controller. Background technique [0002] In the field of motor control, the controller will control and adjust the PWM signal according to the output of the motor, so that the output of the motor can be stabilized within a safe range. Specifically, the controller obtains the output magnitude of the motor, and performs PI adjustment on the PWM signal according to the comparison between the output magnitude and the preset threshold value, so as to change the magnitude of the PWM signal. For example, if the motor output increases, then reduce the PWM signal; if the motor output decreases, then increase the PWM signal. However, when the output of the motor exceeds the safe range value, the controller will perform wave-by-wave current limiting protection for the motor. The main method used is: when it detects that t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem proposed by the above-mentioned background technology that the PWM signal is wave-sealed to reduce the output current of the motor to a certain value, and then the PWM signal is turned on again to cause overshooting in the control, thereby causing the problem of secondary overcurrent, the present invention provides A wave-by-wave current limiting protection method, device and motor controller

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