Distributed structure and control method of high voltage and high frequency electrostatic precipitation power supply inverting circuit

Abstract

The invention discloses a distributed structure and control method of high voltage and high frequency electrostatic precipitation power supply inverting circuit. The structure comprises a three-phase rectifier bridge for accessing a 380V AC frequency power supply and outputting stable DC voltage; a high-frequency inverting circuit comprising a chain type H-bridge multilevel inverting circuit consisting of N H-bridge units and LC filters connected to each H-bridge unit for receiving the DC voltage and outputting AC pulses; a switching rectification transformer connected with the output end of the high-frequency inverting circuit and boosting and rectifying the received AC pulses and outputting the boosted DC pulse voltage to the load; and a control system connected between the switching rectification transformer and the high frequency inverting circuit for controlling the driving signal of the high frequency inverting circuit in accordance with the signal feedback from the output end of the switching rectification transformer. According to the invention, the working efficiency and the fault-tolerant ability of the power supply improve, which is beneficial to the safe run of a system when the system is upgraded for expansion or fault occurs to the system.

Description

technical field [0001] The invention relates to a distributed structure and a control method of an inverter circuit of a high-voltage and high-frequency electrostatic dust removal power supply, and belongs to the technical field of high-voltage, high-frequency and high-power power supplies. Background technique [0002] As a kind of dust removal equipment with high dust removal efficiency, wide dust removal range, small power loss, convenient maintenance and management, electrostatic precipitator has been widely used in thermal power plants, steel, metallurgy, papermaking, cement, textile, chemical industry and other fields. It plays a very important role in reducing harmful dust in the atmosphere. [0003] At present, the power supply system of high-voltage high-frequency pulse electrostatic precipitator is composed of three-phase rectifier bridge, high-frequency inverter circuit, switching rectifier transformer and control circuit. In the high-frequency inverter circuit, ...

AI Technical Summary

Problems solved by technology

In the high-frequency inverter circuit, a full-bridge inverter circuit is generally used, and the output voltage harmonics of this circuit are relatively large, which is not conducive to the efficient operation of the system.

[0004] The output end of the traditional chain-type H-bridge multi-level inverter circuit adopts a centralized filter structure. work, the fault tolerance rate is low, which is not conducive to future upgrades and expansions and the safe and stable operation of the system when a fault occurs

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