Summary
International Symposium on Electromagnetic Compatibility
2014
Session Number:13A1-A
Session:
Number:13A1-A1
Investigation of Relation between Switch Timing Difference and Common-mode Voltage on Cable
Toshiya Uchida, Nobuo Kuwashiro, Hideya Sato,
pp.-
Publication Date:2014/05/12
Online ISSN:2188-5079
Summary:
From the viewpoint of energy saving, many kinds of inverter control equipment are used in the environment. Theinverter circuits have a potential of a disturbance source because the high voltage and high speed switching devices are used in the inverter circuits. In this report, we investigated the relationship between the switch timing difference of inverter circuit and the common-mode voltage on the cable. First, we investigated the mechanism generating the common mode voltage by using the inverter system which was used for driving a three phase motor. A simple equivalent circuit of the system was created. And then, the mechanism was evaluated by the circuit simulation. The results showed that the switch timing difference caused the commonmode voltage. Next, the drive circuit was constructed by using CPLD, and the common-mode voltage was measured by capacitive voltage probe (CVP). The results showed that the common-mode voltage increased by the increase of the switch timing difference and the influence mainly appeared below 1MHz.