Numerically-controlled modular microcomputer power supply overvoltage-undervoltage protection circuit

Abstract

The invention discloses a numerically-controlled modular microcomputer power supply overvoltage-undervoltage protection circuit, which comprises a detection part and a transmission part, wherein the detection part comprises at least one detection module; each detection module comprises an undervoltage comparison circuit, an overvoltage comparison circuit and an alarming circuit, each of the undervoltage comparison circuit and the overvoltage comparison circuit is a hysteresis comparator, test voltages are input into the two comparison circuits simultaneously to be compared with a reference voltage, and output of each comparison circuit is connected with the alarm circuit; and a transmission circuit comprises a microcontroller and an LAN bus module, the output of each comparison circuit is connected with the microcontroller, and the microcontroller is connected with an upper computer through the LAN bus module. The numerically-controlled modular microcomputer power supply overvoltage-undervoltage protection circuit can protect a microcomputer power supply module against overvoltage and undervoltage simultaneously, and has the advantages of being small in size, high in precision, safe and reliable, convenient and universal, and more intelligent in transmission.

Description

technical field [0001] The invention belongs to the field of circuit technology, relates to microcomputer power supply protection, in particular to overvoltage and undervoltage protection, and is a digitally controlled modular microcomputer power supply overvoltage and undervoltage protection circuit. Background technique [0002] The microcomputer protection system is an important part of the power system. Misoperation or refusal of the microcomputer protection device will have a great impact on the power grid, and its importance is self-evident. The working power of the microcomputer protection device is the driving force for the correct and reliable action of the entire microcomputer protection device. At present, in the actual operation and maintenance, in order to ensure the reliable and correct operation of the microcomputer protection device, in the routine maintenance process, a complete maintenance process is adopted to regularly check the protection device, and whe...

AI Technical Summary

Problems solved by technology

However, whether it is routine maintenance or condition maintenance, there is a lack of real-time monitoring and alarming of the working power of the protection device. Once the voltage is too high, too low or even directly cut off, the CPU cannot work, and the self-test function of the device cannot operate.

In addition, due to the harsh operating environment of the protection device and the aging hardware of the power plug-in, the working power of the device is prone to voltage instability or direct power failure.

The ensuing problems will cause unstable operation of the device, low working efficiency, greatly shortened working life, etc., and the cost will inevitably increase.

[0003] At present, many power modules have the function of overvoltage and undervoltage protection. However, the overvoltage and undervoltage protection of these power modules have many limitations. For example: 1. The overvoltage and undervoltage protection is packaged inside the power module. , the user cannot adjust the precision and protection voltage level according to the demand; 2. The precision of the general protection function is too low, and the cost of the protection circuit with high precision is high; 3. Each power supply needs a separate overvoltage or undervoltage protection circuit. High cost

The existing overvoltage and undervoltage protection schemes are not suitable for the use requirements of the power detection of the microcomputer protection device, and cannot be connected with the maintenance of the microcomputer protection device. In addition, the protection circuit in the prior art can only adjust the inside of the power module. The working status information of the power supply cannot be obtained, and the power management personnel lack sufficient detailed warning information on the system status

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