1、毕业设计 1 中文 4700 字， 2900 单词， 15500 英文字符 出处： Ogasawara S, Ayano H, Akagi H. An active circuit for cancellation of common-mode voltage generated by a PWM inverterJ. IEEE Transactions on Power Electronics, 2002, 13(5):835-841. 英文文献 AN Active Circuit for Cancellation of Common-Mode Voltage Generated by a
2、PWM Inverter Satoshi Qgasawara, Hideki Ayano and Hirofumi Akagi Department of Electrical Engineering Okayama University 3-1-1 Tsushima-Naka, Okayama, 700 .JAPAN Abstract This paper proposes an “Active Common-noise Canceller (ACC)” that is capable of eliminating the common-mode voltage produced by a
3、PWM inverter. An emitter follower using complementary transistors and a common-mode transformer are incorporated into the ACC, the design method of which is also presented in detail. A prototype ACC designed and constructed in this paper verifies the viability and effectiveness in a 3.7kW induction
4、motor drive using an IGBT inverter. Some experimental results show that the ACC makes significant contributions to reducing a ground current and a conducted EMI. In addition, the ACC can prevent an electric shock on a non-grounded motor frame and can suppress a motor shaft voltage. I. INTRODUCTION A
5、n emergence of high-speed switching devices such as IGBTs has enabled to increase, a carrier frequency of voltage source PWM inverters, thus leading to much better operating characteristics. High-speed switching, however, can accompany the following serious problems originating from a steep change i
6、n voltage and/or current: o. ground current escaping to earth through stray capacitors inside motors1-2 o .conducted and radiated EMI3-6 o. bearing current and shaft voltage 7-9 o. shortening of insulation life of motors and transformers10-13 The voltage and/or current change caused by high-speed switching produces high-frequency oscillatory common-mode and normal-mode currents at the instant of every 毕业设计 2 switching, because parasitic stray capacitors inevitably e
