AC-AC (alternating current) frequency conversion control panel integrating with MODBUS protocol

Abstract

The invention discloses an AC-AC (alternating current) frequency conversion control panel integrating with a MODBUS protocol, and relates to the field of AC-AC frequency conversion control. The AC-AC frequency conversion control panel comprises a DSP+FPGA (digital signal processor + field programmable gate array) coprocessor, a MODBUS interface, a synchronous voltage interface, a pulse driver interface, an A / D (analog / digital) converting module and a motor rotating speed position sampling module. By the aid of the DSP+FPGA coprocessor which is communicated with a MODBUS master station through the MODBUS interface, synchronous voltage generated by the synchronous voltage interface, voltage and current signals generated by the A / D converting module and motor speed and position signals are received, a control pulse is generated by means of speed regulation, direct current regulation, vector control, field weakening control and alternating current regulation through an alternating voltage feedforward compensation link, an alternating current breaking compensation link, a commutating logic circuit without circumfluence and a phase-shifted triggering link task, and finally the control pulse is converted into a suitable level signal through a pulse driving interface so as to drive an AC-AC frequency conversion power circuit. The AC-AC frequency conversion control panel integrating with the MODBUS protocol has the advantages that the DSP and the FPGA are adopted to work together as a core processor, and the existing problems of complexity in structure, low efficiency, high cost and the like are solved.

Description

technical field [0001] The invention relates to the field of AC frequency conversion control, in particular to an AC frequency conversion control board integrating MODBUS protocol. Background technique [0002] With the development of digital control and power electronics technology, in the current speed control field, AC drive gradually replaces the position of DC drive and becomes the mainstream. In the field of high-power AC drive, AC frequency converter is currently the most widely used AC speed control scheme. . The control system of the AC frequency converter is very complicated. The traditional control system of the AC frequency converter is composed of multiple analog systems. Due to the temperature drift, zero drift and aging problems of the analog devices, the system cost is high, the structure is complicated, and it is inconvenient to debug and use. With the development of digital control technology, in recent years, foreign companies have adopted multi-processor...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an AC frequency conversion control board integrating MODBUS protocol for the problems of complex structure and low efficiency of the controller when the multiprocessor system is used to complete the vector control task of the AC frequency converter;

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