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http://dx.doi.org/10.6113/TKPE.2014.19.6.522

Isolation Amplifier Circuits for Sensing and Feedback of the Inverter DC-Link Voltage  

Kim, Kyung-Seo (Dept. of Energy Grid, Sangmyung University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.6, 2014 , pp. 522-529 More about this Journal
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.
Keywords
Isolation amplifier; DC-link voltage; Voltage sensing; Voltage feedback;
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