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An analysis of the highly linear transfer characteristics of dual-buck converters
IEEE Transactions on Industrial Electronics ( IF 7.7 ) Pub Date : 2018-06-01 , DOI: 10.1109/tie.2017.2772175
Jan M. Schellekens , Henk Huisman , Jorge L. Duarte , Marcel A. M. Hendrix , Elena A. Lomonova

Practical switching devices have finite turn-on and turn-off times. To avoid short circuit, a blanking time is added between turn-off and turn-on of the complementary working switches in a switching-leg. The blanking time, also referred to as deadtime, is one of the dominant sources of output current and voltage distortion in pulse-width modulated (PWM) power amplifiers. Extensive studies exist on elimination, minimization, and compensation of the effect. Most techniques achieve a reduction of the distortion but are not capable of completely removing it. The dual-buck (DB) converter does not suffer from blanking-time-related distortion. However, blanking time is not the only source of switching-leg-induced distortion. This paper focuses on the effects of semiconductor device parameters on the output quality of the DB converter. It is shown that, ideally, the forward voltages of the diodes and switches have no effect on the output quality. Measurements on a prototype, industrial power stack based, DB converter show a 100 times improvement of the open-loop spurious free dynamic range when compared to conventional PWM converters.

中文翻译:

双降压转换器的高线性传输特性分析

实用的开关器件具有有限的开启和关闭时间。为了避免短路,在开关支路中互补工作开关的关断和导通之间增加了一个消隐时间。消隐时间也称为死区时间,是脉宽调制 (PWM) 功率放大器中输出电流和电压失真的主要来源之一。存在关于消除、最小化和补偿效应的广泛研究。大多数技术可以减少失真,但不能完全消除失真。双降压 (DB) 转换器不会受到与消隐时间相关的失真的影响。然而,消隐时间并不是开关腿引起的失真的唯一来源。本文重点研究半导体器件参数对DB转换器输出质量的影响。结果表明,理想情况下,二极管和开关的正向电压对输出质量没有影响。对基于工业电源堆栈的原型 DB 转换器的测量显示,与传统 PWM 转换器相比,开环无杂散动态范围提高了 100 倍。
更新日期:2018-06-01
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