低压变频器线线间雷击浪涌6kV防护回路设计
王佳佳，吕广强
南京理工大学 自动化学院，江苏 南京 210094
摘 要：变频器常规浪涌防护回路在线线间雷击浪涌6kV时，变频器的绝缘栅双极晶体管(IGBT)模块通常会损坏。介绍了一种低压变频器线线间雷击浪涌防护回路的设计，在常规雷击浪涌防护回路基础上外加一级电感构成LC低通滤波回路，在雷击浪涌6kV时可以保护变频器的IGBT模块免受击穿。利用图解法确定了压敏电阻上的残压，通过理论计算确定了电感量，并给出了线线间雷击浪涌6kV的实例分析。结果表明，在雷击浪涌为6kV时，压敏电阻与LC低通滤波回路能将变频器线线间残压限制到1200kV以内。
关键词：变频器；雷击浪涌防护回路；压敏电阻；LC低通滤波回路
中图分类号：TM863；TN773 文献标识码：A 文章编号：1007-3175(2014)08-0011-04
Protective Circuit Design for 6kV Lightning Surges Between Low-Voltage Inverter Lines
WANG Jia-jia, LV Guang-qiang
School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: When the conventional inverter protective circuit turns up 6kV lightning surge between lines, the module of insulated gate bipolar transistor (IGBT) will be damaged generally. Introduction was made to a kind of protective circuit design for 6kV lightning surges between low-voltage inverter lines. By adding an inductance to configurate a LC low pass filtering circuit on the conventional protective circuit of lightning surges, the inverter IGBT module could avoid breaking down at 6kV lightning surges. The diagram method was used to obtain residual voltage on the piezoresistor, the inductance value was determined by theoretical calculation and the actual example of 6kV lightning surges between lines was analyzed. The result shows that when the lightning surges are at 6kV, the piezoresistor and LC low pass filtering circuit will limit inverter residual voltage between lines within 1200kV.
Key words: inverter; protective circuit of lightning surge; piezoresistor; LC low pass filtering circuit
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