FPGA wideband phase-shift trigger for dual controllable converters staggered by 30 degrees

Abstract

The invention belongs to a digital phase-shift trigger and particularly discloses an FPGA wideband phase-shift trigger for dual controllable converters staggered by 30 degrees. The digital phase-shift trigger comprises a dual-Y 30-degree-staggered synchronous shaping circuit, an AD converter, a first level conversion circuit, an FPGA circuit, a second level conversion circuit and a drive amplifying and isolating circuit, wherein the output end of the dual-Y 30-degree-staggered synchronous shaping circuit and the output end of the AD converter are communicated with the input end of the FPGA circuit through the first level conversion circuit, and the output end of the FPGA circuit is communicated with the input end of the drive amplifying and isolating circuit through the second level conversion circuit. According to the digital phase-shift trigger disclosed by the invention, the core function of the trigger is achieved inside the FPGA circuit, the defects of a trigger usually caused by performance difference of circuit devices are overcome, the structure is simplified and the working stability is improved.

Description

technical field [0001] The invention belongs to a digital phase-shift trigger, in particular to an FPGA wide-band tracking digital phase-shift trigger used for 30° interleaving double controllable converters. Background technique [0002] At present, most of the three-phase controllable converter equipment have their own independent phase-shift triggers; most of them are composed of digital or analog circuits; the triggers are based on the three-phase synchronous Signal and external control given signal, output 6 phase-shift pulses, which are used to trigger the thyristor on the corresponding bridge arm of the device. [0003] In the usual trigger system, the processing of the three-phase synchronous signal is realized through three single-phase circuits; each single-phase circuit performs high-frequency filtering, phase adjustment, and shaping processing on the input single-phase synchronous signal; due to device performance or Due to the difference in parameters, there wi...

AI Technical Summary

Problems solved by technology

If the frequency of the three-phase input AC changes during the working process, the phase shift angle of the output pulse will be affected, which will reduce the control accuracy, and the working parameters of the converter equipment will not meet the working requirements.

[0005] If two sets of three-phase controllable converter equipment with AC input staggered by 30° and frequency changes are jointly powered in series / parallel, the usual triggers will be difficult to adapt to; Factors such as performance differences and AC input frequency changes will cause uneven output waveforms of power supply equipment, reduced control accuracy, and unbalanced current / voltage.

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