Controller current sampling system

Abstract

The invention discloses a controller current sampling system which comprises a channel selection module, a current sampling and conditioning module and a control module, the channel selection module comprises three channel selection sub-modules; the current sampling and conditioning module comprises three current sampling and conditioning circuits; the input of each channel selection sub-module isrespectively connected with a three-phase current signal and a reference signal; the output of each channel selection sub-module is connected with the input of a corresponding current sampling conditioning circuit; the control module controls the channel gating of the channel selection module and collects a three-phase current sampling signal output by the current sampling and conditioning moduleto control a motor. The free switching and different combinations of the circuits can be realized, and when one path of the sampling system is abnormal, the normal operation of a controller can be guaranteed through channel selection and the combination of the remaining circuits capable of working normally. Meanwhile, the circuit can be self-checked through different selections of channels such that the fault reason can be quickly determined.

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

Images