Power electronic device auxiliary control system based on CPLD chip

Abstract

The invention discloses a power electronic device auxiliary control system based on a CPLD chip. The system comprises a DSP, a CPLD chip driving the DSP to work, a digital signal detection unit connected with the input end of the CPLD chip, and a display and alarm part, an IGBT driver board and a contactor control unit which are connected with the output end of the CPLD chip. The CPLD chip comprises an RS trigger group, a setting logic AND gate, a fault identification module, a protection logic AND gate, a blocking logic OR gate, a first time delay logic and a second time delay logic. The power electronics device auxiliary control system based on a CPLD chip of the invention has a comprehensive fault protection function covering DC bus over-voltage, DC over-current, three-phase AC output over-voltage, three-phase AC load over-current and other faults, is of high versatility, and is applicable to all kinds of conventional power electronic devices. A fault type identifying method is provided, the type of a fault can be identified quickly and timely, and different alarm operations can be adopted according to different fault types to make the operation of the power electronic device run more flexible and efficient.

Description

technical field [0001] The invention belongs to the field of power electronic devices, in particular to a CPLD chip-based auxiliary control system for power electronic devices. Background technique [0002] A power electronic device is a device that realizes the controllable conversion, transmission, processing and control of electric energy, and highly integrates energy and information. Whether it is a traditional industry or a high-tech industry, especially in the field of power conservation, there is an urgent need to provide high-quality and controllable power. The use of power electronic devices can efficiently convert various energy sources into high-quality electric energy. It has become a link between weak current control and strong current operation, between information technology and advanced manufacturing technology, and traditional industries to achieve automation, intelligence, energy saving, The bridge between mechatronics. Therefore, power electronic devices...

AI Technical Summary

Problems solved by technology

[0005] 1. The function of the circuit is relatively simple, only the AC overcurrent and DC overvoltage signals are processed, but other possible fault signals are not considered, the application occasions are limited, and the versatility is not strong;

[0006] 2. When a fault occurs and the protection circuit works, it is impossible to judge which faults caused the protection, and it is also impossible to identify the first fault, which is not conducive to the maintenance personnel to analyze the cause of the fault and deal with different faults in a targeted manner;

[0007] 3. The fault handling method is single, and the flexibility and adaptability are not strong

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