A Controller Current Sampling System

Abstract

The invention discloses a controller current sampling system, comprising: a channel selection module, a current sampling and conditioning module, and a control module; the channel selection module includes three channel selection sub-modules; the current sampling and conditioning module includes three current sampling and conditioning circuits; The input of each channel selection sub-module is respectively connected to the three-phase current signal and the reference signal; the output of each channel selection sub-module is connected to the input of the corresponding current sampling and conditioning circuit; the control module controls the channel gating of the channel selection module, and collects The three-phase current sampling signal output by the current sampling and conditioning module is used to control the motor. Free switching and different combinations of circuits can be realized. When one channel of the sampling system is abnormal, the remaining circuits that can work normally can be combined to ensure the normal operation of the controller through channel selection; Perform self-inspection to quickly locate the cause of the fault.

Description

technical field [0001] The invention belongs to the field of motor controllers and relates to a controller current sampling system. Background technique [0002] As an important part of the motor controller, the current and voltage sampling system feeds back the actual sampled value during the working process of the controller in real time and transmits it to the control module of the controller. The control module then sends instructions to adjust the "deviation" according to the feedback information to achieve closed-loop feedback. So as to ensure the control accuracy. [0003] Such as figure 1 As shown, the current sampling scheme adopted by controllers currently on the market usually uses three current sensors to sample the current of the three-phase UVW motor in the actual working process, and correspondingly adjusts the three-phase current sampling signals through UVW three-phase current sampling. After the circuit is processed, it is passed to the control module. T...

AI Technical Summary

Problems solved by technology

The sampling signal is processed through one-to-one corresponding current sampling method. When the current sampling system is abnormal, the torque of the motor controller will fluctuate. In serious cases, the controller will even report a current fault signal, so that the controller cannot work. Unable to self-test to confirm whether the current sensor is faulty or the sampling conditioning circuit is abnormal, and the cause of the fault cannot be located, so that the next step cannot be carried out

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