Power supply fault diagnosis and protection device based on multi-stage voltage stabilization technology

Abstract

The invention relates to a multistage voltage stabilization technology-based power source fault diagnosis and protection device. The device is composed of a first-stage voltage stabilizing circuit, a second-stage voltage stabilizing circuit, a switch control circuit, an under voltage protection circuit, an overvoltage protection circuit and a fault latch circuit. Functionally speaking, the device has a two-stage power source stabilizing function and can diagnose overvoltage and undervoltage faults in the operating process of a power source, and the device can cut off output voltage through a switch when a fault occurs, at the same time, the fault latch circuit can maintain a power-off state until re-electrification; structurally speaking, the circuit is composed of six small packaged ICs and a small number of resistors and capacitors, and therefore, the circuit has a voltage stabilizing function and a protection function, and the size of the circuit can be small, and thus, the problems of circuit complexity and large size of a general power source protection circuit can be solved; and the integrated IC chips are adopted in design, so that high reliability and high universality can be realized.

Description

technical field [0001] The invention relates to the field of power supply fault diagnosis and protection suitable for industrial process control devices, in particular to a power supply fault diagnosis and protection device based on multi-stage voltage stabilization technology. Background technique [0002] In the field of industrial process control such as petroleum, chemical industry, metallurgy and nuclear power, the safety requirements of the production process are very strict, and the detection and control of the environment are becoming more and more important. As an important part of functional safety devices, the power supply affects the entire system. The overall performance of the device, therefore, a reasonably designed and highly reliable power supply circuit is one of the factors that improve the reliability of functional safety devices. [0003] At present, most general-purpose power supply diagnostic circuits use analog circuits, which convert the power supply...

AI Technical Summary

Problems solved by technology

[0003] At present, most general-purpose power supply diagnostic circuits use analog circuits, which convert the power supply voltage through A / D and send the collected digital signals to the MCU. The MCU calculates the power supply voltage and controls the power supply by judging whether the voltage value is within a safe range. There is also a diagnostic circuit that compares the set voltage with a comparator. When the voltage exceeds the set range, a fault signal is generated to control the output of the power supply. Both of the above two circuits have the problems of complicated circuit design and high cost, and An additional power supply is also required to supply power to the A / D converter and MCU or comparator. Since the A / D converter and MCU are intelligent components, the probability of failure increases. Relatively small circuits with strong diagnostic and protective functions are a key point in the development of power supplies for functional safety devices

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