AC-AC frequency conversion current digital control system based on DSP and FPGA

Abstract

The invention relates to an all-digital-control AC-AC frequency conversion current control digital system based on DSP and FPGA, consisting of a DSP mainboard, an FPGA interface board, a VME-based bus host computer, a synchronizing voltage interface circuit, a pulse drive interface circuit, an A / D sampling interface circuit, a synchronous transformer, a pulse triggering power amplifying board and a voltage current sensor; the DSP mainboard mainly carries out calculation of a current regulator, current discontinuous compensation and the triggering angle. The invention has the advantages that: the DSP and FPGA chips are adopted to realize the digital phase shift triggering and the circulating-current-free commutation logic of a thyristor, thus the precision and real-time of the triggering pulse are improved significantly; the sources in the FAGP and the information interchange which is realized by a double-port RAM and is based on the VEM bus host computer are utilized, thus the speed ratio of information interchange and the accuracy of data are improved.

Description

technical field [0001] The invention relates to a current controller of an AC / AC frequency converter, in particular to a fully digitally controlled AC / AC frequency current digital control system based on DSP and FPGA. 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 themselves, 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 ye...

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Problems solved by technology

[0008] In order to solve the problems of complex structure and low efficiency in the existing multi-processor general controller, the present invention provides a fully digital control digital system based on DSP and FPGA, which is mainly composed of a DSP main board and an FPGA interface board. , PC based on VME bus, synchronous voltage interface circuit, pulse drive interface circuit, A / D sampling interface circuit, synchronous transformer, pulse trigger power amplifier board, voltage current sensor and current zero-crossing detection board

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