低壓變頻器線線間雷擊浪涌6kV防護回路設計
王佳佳，呂廣強
南京理工大學 自動化學院，江蘇 南京 210094
摘 要：變頻器常規浪涌防護回路在線線間雷擊浪涌6kV時，變頻器的絕緣柵雙極晶體管(IGBT)模塊通常會損壞。介紹了一種低壓變頻器線線間雷擊浪涌防護回路的設計，在常規雷擊浪涌防護回路基礎上外加一級電感構成LC低通濾波回路，在雷擊浪涌6kV時可以保護變頻器的IGBT模塊免受擊穿。利用圖解法確定了壓敏電阻上的殘壓，通過理論計算確定了電感量，并給出了線線間雷擊浪涌6kV的實例分析。結果表明，在雷擊浪涌為6kV時，壓敏電阻與LC低通濾波回路能將變頻器線線間殘壓限制到1200kV以內。
關鍵詞：變頻器；雷擊浪涌防護回路；壓敏電阻；LC低通濾波回路
中圖分類號：TM863；TN773 文獻標識碼：A 文章編號：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
參考文獻
[1] 張小青.建筑物內電子設備的防雷保護[M].北京：電子工業出版社，2000.
[2] Rabde V P.Metal oxide varistors as surge suppressors[C]//Proceedings of the Internati-
onal Conference on Electromagnetic Interfere-
nce and Compatibility, 1997.
[3] Noack F, Pospiech J, Brocke R, Schonau J. Reliable overvoltage protection of electronic devices in low-voltage power systems[C]// International Symposium on Electromagnetic Compatibility, 1999.
[4] Siegert R, Mohammed O A.Selection of varistor for surge protection purposes based on their voltage-current characteristic[C]//Proceedings of the IEEE, 2000.
[5] 莫付江，阮江軍，陳允平.綜合浪涌抑制器的研究[J].華東電力，2003，31(2)：1-4.
