消除高精度放大器的过零失真

J. Schellekens, J. Duarte, H. Huisman, M. Hendrix
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引用次数: 16

摘要

开关消隐时间,也称为死区时间,是脉宽调制放大器输出电流和电压畸变的主要来源之一。在消除、最小化和补偿影响方面进行了广泛的研究。大多数技术实现了复位,但不能完全去除它。本文论证了将所谓的反向电流变换器拓扑与先进的前馈技术相结合,完全消除死区时间效应是可能的。对电流变换器的过零行为进行了分析,并与具有等效滤波输出的传统全桥变换器进行了比较。在全桥和1.5 kW的对电流变换器上进行了仿真和测量,以证明所提出的思想在高精度应用中的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Elimination of zero-crossing distortion for high-precision amplifiers
Switch blanking time, also referred to as dead-time, is one of the dominant sources of output current and voltage distortion in pulse width modulated amplifiers. Extensive studies are known on elimination, minimization, and compensation of the effect. Most techniques achieve a reduction but are not capable of completely removing it. This paper demonstrates that it is possible to fully eliminate dead-time effects by applying the socalled opposed current converter topology in combination with advanced feedforward techniques. The zero-crossing behavior of the opposed current converter is analyzed and compared to a conventional full-bridge converter with equivalently filtered output. Simulations and measurements on a full-bridge and an opposed current converter of 1.5 kW are included to demonstrate the effectiveness of the proposed ideas for high-precision applications.
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