Extensible digital quantity input and output module of double-fed frequency converter

Abstract

The present invention provides an extensible digital quantity input and output module of a double-fed frequency converter. The extensible digital quantity input and output module comprises a complex programmable logic device (CPLD) and a digital quantity input circuit and a digital quantity output circuit which are connected with the CPLD; the digital quantity input circuit includes an external input connector, a protective circuit, a digital quantity acquisition circuit, an isolation circuit and a waveform shaping circuit which are connected in order, wherein the output end of the waveform shaping circuit is connected with the IO interface of the CPLD; and the digital quantity output circuit includes an isolation circuit, a self-protection driving circuit, a protective circuit and an external output connector which are connected in order, and the input end of the isolation circuit is connected with the IO interface of the CPLD. Compared with the prior art, the extensible digital quantity input and output module of the double-fed frequency converter is convenient and rapid, and is able to realize the efficient and rapid expansion of the digital quantity input and output modules with no need for special chips or operation systems.

Description

technical field [0001] The invention belongs to the technical field of wind power generation equipment, and in particular relates to an expandable digital input and output module of a double-fed frequency converter. Background technique [0002] At present, the digital input and output modules of double-fed inverters mainly rely on imports, and these imported modules are costly and must be attached to the host for use; or the bus expansion is realized through dedicated chips, but these chips are still imported, and the application is It is based on a certain operating system, so it is quite complicated to use; or some domestic manufacturers make their own input and output modules, which do not have scalability. Once external demand increases, it is difficult to respond conveniently and quickly. [0003] The mainstream of imported modules is represented by the digital input and output modules of German Beckhoff Company. The E bus is used to transmit the binary control signals...

AI Technical Summary

Problems solved by technology

The implementation method is simple and fast, but the disadvantage is that the number of channels is fixed, and the expansion cannot be well realized

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