A Transformerless Switched-Capacitor Converter Applicable for Photovoltaic Systems

2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) Pub Date : 2022-02-01 DOI:10.1109/pedstc53976.2022.9767351

S. Hasani, R. Beiranvand

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引用次数: 1

Abstract

A transformerless multi-input soft-switched high step-up switched-capacitor converter (SCC) suitable for high-power and high-voltage applications is going to be introduced in the present research. Zero voltage switching (ZVS) operation is provided for all power MOSFETs and diodes of the proposed topology by using active clamp circuits. Soft switching operation eliminates or significantly reduces the loss of switching so that high values of efficiency could be obtained. Moreover, the switching frequency could be highly increased as a result of soft switching operation. High switching frequency brings about high power density and passive components size reduction. Furthermore, Cockcroft-Walton voltage multiplier (CW-VM) units are employed to reach high values of voltage conversion ratio without applying high voltage stresses on the components. To approve the proper function of the proposed converter, a three phase prototype having three cell voltage multiplier (VM) units, 40 V input voltages, 925 W output power and 385 V output voltage is simulated at 150 kHz switching frequency.

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一种适用于光伏系统的无变压器开关电容器变换器

本文介绍了一种适用于大功率高压应用的无变压器多输入软开关高升压开关电容器变换器。零电压开关(ZVS)操作提供了所有功率mosfet和二极管提出的拓扑通过使用有源箝位电路。软开关操作消除或显著降低了开关的损耗，从而获得较高的效率值。此外，由于软开关操作，可以大大提高开关频率。高开关频率带来高功率密度和减小无源器件尺寸。此外，采用Cockcroft-Walton电压乘法器(CW-VM)单元，在不施加高电压应力的情况下达到高电压转换率。为了验证所提出的转换器的正确功能，在150 kHz开关频率下，对具有三个单元电压乘法器(VM)单元，输入电压为40 V，输出功率为925 W，输出电压为385 V的三相原型进行了仿真。

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2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

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