Digital stabilized power supply control circuit based on SPLD (simple programmable logic device)

Abstract

The invention provides a digital stabilized power supply control circuit based on an SPLD (simple programmable logic device). The alternating power frequency power supply of the control circuit is input from a main circuit, and output by a compensation equipment transformer; an effective value circuit samples the output voltage to obtain a direct current signal, and a digital signal of the output voltage through a comparing circuit; and the digital signal is processed by a programmable digital logic circuit to drive a switch circuit to control a compensation transformer for stabilizing compensation so as to form a typical constant voltage closed loop control system. The digital stabilized power supply control circuit has the following advantages that: a control signal in the digital stabilized power supply control circuit is based on a power frequency alternating current effective value signal, and the problem sensitive to the waveform is not existed in alternating current synchronous collection. The SPLD uses the programmable devices to realize combination logic, so that the control method is optimized, the stabilizing responding speed is fast, the system instantaneity is strong, and the work is reliable. By the application of the SPLD chip, the scale of the stabilized control circuit is small; the production and manufacturing techniques are simplified; and the efficiency is improved; furthermore, the fault of the circuit board is conveniently debugged and maintained.

Description

technical field [0001] The invention relates to the field of electric and electronics, in particular to an SPLD-based digital stabilized power supply control circuit. Background technique [0002] The method of digital compensation voltage stabilization was produced very early in the last century. There are mainly two types of voltage stabilization control methods. One is to sample AC synchronously, and compare the amplitude wave by wave to determine the polarity and size of compensation. The digital pulse edge signal is generated by the detection circuit, and the reversible counter is triggered to output a matching signal to control the switch drive circuit to be turned on and off to realize compensation and voltage stabilization. The other is to sample the power frequency AC and send the sampling results directly to the embedded control system or through the peripheral interface chip to perform A / D conversion on the signal and then send it to the embedded control system fo...

AI Technical Summary

Problems solved by technology

[0003] In the first type of circuit, due to the strong timeliness of sampling synchronization, it is sensitive to harmonic interference of power frequency AC. When the waveform distortion is serious, the circuit signal output is invalid, and even changes periodically, resulting in voltage stabilization and oscillation, and the device is frequently turned on and aging is accelerated. The circuit currently uses discrete devices and is driven by a power frequency signal. There is competition and risk in the digital circuit, and there is a hysteresis in the control

In the second type of control method, the control method for compensating and stabilizing voltage is only three groups to control the existence and direction of the back electromotive force of the transformer. The intelligent level of sampling and control system control is relatively high, and the calculation process is complicated and requires high hardware requirements. The voltage-stabilized control system adopts a simple algorithm, the rich collected data cannot be processed properly, false signals cannot be identified, and the circuit cannot handle external interference well.

At the same time, there are inherent defects in the MCU. There are variable data areas and useless blank areas in the memory. Power-on, reset, complex environments, and software defects of the program often cause the program to run off-track, resulting in dangerous invalid output.

The actual interference at the production site is serious, the voltage regulation control often fails, and the voltage regulation is bypassed

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