Control input and output circuit for alternating current servo control system for electric fork truck

Abstract

The invention relates to a control input and output circuit for an alternating current servo control system for an electric fork truck. The existing product has the defects that the control precision, the safety, the reliability and the anti-jamming capability are insufficient. The control input and output circuit comprises a TMS320F2812 digital processing chip, switch control signal input and output circuits and an analog control signal input circuit, wherein the switch control signal input circuit comprises thirteen downward pulling resistors, twelve voltage division resistors, six upward pulling resistors, six clamp diodes, six filter capacitors, six operation amplifiers and a driving chip, the switch control signal output circuit comprises four downward pulling resistors, three current limiting resistors, an upward pulling resistor, a rectifying diode, four freewheel diodes and a driving chip, and the analog control signal input circuit comprises eight voltage division resistor, five clamp diodes, seven filter capacitors and four operation amplifiers. The control input and output circuit has the advantages that the sampling precision is ensured, and the reliability and the anti-jamming capability of the circuit and the safety of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to a control input and output circuit of an AC servo control system of an electric forklift. Background technique [0002] Forklifts play a huge role in logistics. Forklifts are classified according to the way of power, which can be divided into internal combustion forklifts and electric forklifts. Due to the following advantages of electric forklifts: no exhaust emission during use, low noise, convenient and smart operation, and stable operation, the demand for electric forklifts from domestic and foreign users continues to increase. Due to its relatively cheap cost, DC drive has been widely used in electric equipment as a driving method for a long time. However, the DC drive system has some inherent defects in performance and maintenance. In contrast, the AC servo drive system with AC motor as the core has the characteristics of high efficiency, energy saving, strong reliab...

AI Technical Summary

Problems solved by technology

There are related circuits on the market, but the control accuracy, safety, reliability and anti-interference ability cannot fully meet the requirements. To develop an electric forklift with high precision, good safety, high reliability and strong anti-interference ability The PWM output and protection circuit of the AC servo control system become very urgent

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