Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Isolation Amplifier Circuits for Sensing and Feedback of the Inverter DC-Link Voltage
Authors Kyung-Seo Kim
DOI 10.6113/TKPE/2014.19.6.522
Page pp.522-529
ISSN 1229-2214
Keywords Isolation amplifier; DC-link voltage; Voltage sensing; Voltage feedback
Abstract This study proposes an isolation amplifier circuit for the sensing and feedback of inverter DC-link voltage, which is inevitable for the precise control of inverter output voltage. The isolation amplifier consists of a pulse-width modulator and a pulse transformer with dual secondary windings. The accuracy of the proposed circuit depends on the precise matching of filter parameters in dual secondary circuits. The influences of parameter inaccuracy on the amplifier performances are analyzed. A modified circuit is proposed to reduce the dependency on filter parameters. The validity of the proposed method is verified through simulation and experiment.