Digital silicon-controlled rectification control device and method

Abstract

The invention discloses a digital silicon-controlled rectification control device and method. The device comprises a system control module, a frequency calculating module, a PWM (pulse width modulation) output control module, a communication protocol analysis module, an input detection module, a timer module and a communication interface drive module; the system control module is used for controlling status switching during running, detecting a phase sequence in the early stage of power-up and faults in the whole running process and outputting PWM signals according to a dynamically corrected frequency; the input detection module is used for determining a phase base point of input power. The digital silicon-controlled rectification control device and method has the advantages that omission of hardware pre-charging devices allows ease of adjusting pre-charging phase parameters and ability to adapt to different work environments; different grid frequencies and grid fluctuations are satisfied; the use of a high-precision timer allows high-precision pre-charging control and output control; interruption detection of an input three-phase pulse sequence is highly timely; in case of failures, a rectifier bridge circuit behind can be protected in time, and over-voltage caused damage is prevented.

Description

technical field [0001] The invention relates to the technical field of silicon controlled rectifiers, in particular to a digital silicon controlled rectifier control device and a control method. Background technique [0002] The thyristor rectifier control device is the part that controls the conduction and shutdown of the thyristor in the rectification system. For the position of the device in the rectification system, see figure 1 (MCU part), its input is a three-phase pulse sequence, the rising edge of the pulse corresponds to the 30-degree phase of each phase of alternating current, the falling edge is 150-degree phase, and the output is three-way PWM signal, which is connected to the thyristor through the rectifier drive device , so as to control the turn-on and turn-off of the thyristor. At present, the common thyristor rectifier controllers are mostly realized by analog circuits, and the adjustability is relatively poor. Some digital rectifier controllers also use re...

AI Technical Summary

Problems solved by technology

At present, the common thyristor rectifier controllers are mostly realized by analog circuits, and the adjustability is relatively poor. Some digital rectifier controllers also use relatively low-end single-chip microcomputers, which only realize the function of PWM output to control the conduction of thyristors. Functions such as pre-charging in the system are still implemented by analog circuits

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