A digital thyristor rectifier control device and control method

Abstract

The invention discloses a digital thyristor rectifier control device and a control method. The device includes a system control module, a frequency calculation module, a PWM 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 responsible for state transition control during operation, completes phase sequence detection at the initial stage of power-on and fault detection during the entire working process, and adjusts the output PWM signal according to the dynamic correction frequency. The input detection module is used to determine the phase of the input power supply base point. The invention eliminates the hardware pre-charging device, which makes the parameters of the pre-charging stage easy to adjust, and can adapt to various working environments; it can adapt to different grid frequencies and grid fluctuations; high-precision timers are used to provide high-precision pre-charging control And output control; interrupt mode detects input three-phase pulse sequence, high real-time performance; in case of failure, it can protect the rectifier bridge circuit behind in time to prevent overvoltage damage.

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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