Structures of transformerless step-up and step-down controlled rectifiers
Structures of transformerless step-up and step-down controlled rectifiers
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DOI：
10.1049/iet-pel:20070133
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发表时间：
2008-06
影响因子：
2
通讯作者：
Y. Berkovich;A. Shenkman;B. Axelrod;G. Golan
中科院分区：
文献类型：
--
作者：
Y. Berkovich;A. Shenkman;B. Axelrod;G. Golan
提出并分析了单、三相无变压器控制整流器的新型单开关结构。这些结构包括一个普通整流器，一个输入电感滤波器，一个高频操作开关和一个二极管-电容器阶梯网络。后者在其已知的应用中用作倍增器，用于增加输入电压。本文还提出了一种新的二极管-电容网络方案，该方案可以作为分压器来降低输入电压。对稳态模式进行了详细的分析，并推导了电压升压速率和降压速率的简单计算公式。通过求解递归方程和使用z变换，对所提出的电路进行了瞬态分析。由于拟议方案不包括任何变压器和/或任何逆变器，因此其运行效率非常高；不产生高次谐波和/或直流分量，因此输入电流和电压波形接近正弦波。与有变压器的结构相比，这种结构的功率因数达到统一，重量低。已经建立并测试了其中一个拟议结构的实验室模型。实验结果证实了转炉的效率和理论分析的正确性。
New single-switch structures of single- and three-phase transformerless controlled rectifiers are proposed and analysed. These structures consist of a common rectifier, an input inductor filter, a high-frequency operated switch and a diode-capacitor ladder network. The latter, in its known application as a multiplier, is used for increasing the input voltage. A new scheme of a diode-capacitor network, which can be used as a divider to reduce the input voltage, is also proposed. The detailed analysis of the steady-state mode is performed and simple formulas for the calculation of step-up and step-down rates of the voltage are derived. Transient analysis of the proposed circuits, by solving the recurrent equations and by using the z-transform, is also performed. Since the proposed schemes do not consist of any transformers and/or any inverters, their operation is very efficient; no high harmonics and/or a DC component are produced, and so the input current and voltage waveform are close to the sinusoid. The power factor of such structures reaches unity and their weight is low, compared with those having a transformer. A laboratory model of one of the proposed structures has been built and tested. The experimental results confirm the convertergraves efficiency and the correctness of the theoretical analysis.