Design of a new modular‐isolated‐forward‐based active snubber cell for power switches

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2024-08-04 DOI:10.1002/cta.4205

Haci Bodur, Abdulkerim Gundogan, Ahmet Faruk Bakan

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Abstract

In this paper, a new modular‐isolated‐forward‐based active snubber cell (SC) for power switches is designed. In the proposed new SC, the zero voltage transition (ZVT) technique is implemented with a forward converter although the current counterparts generally use a flyback converter. In the converter with the new SC, the main switch is turned on with ZVT (full zero voltage switching [ZVS]) and turned off with ZVS, the main diode is turned off with zero current switching (ZCS), the auxiliary switch is turned on with ZCS and turned off with ZVS, and the parasitic capacitor energies are recovered. In addition, thanks to the forward converter, it has been possible to minimize the transformer leakage inductance and greatly reduce the current values of devices in the new SC. The new cell is applied to a single‐phase, grid‐connected, T‐type three‐level inverter (T2‐3LI) as an example. A detailed steady‐state analysis of this inverter was made, and the theoretical analysis was confirmed with measurement results taken from a prototype with 100 kHz and 3.3 kW values. Compared to its hard switching (HS) equivalent, in the converter with soft switching (SS) cell, the total circuit loss was reduced from about 248 W to 86 W, thus achieving an increase in the total efficiency from 92.5% to 97.4%.

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为功率开关设计新型模块化隔离前向有源缓冲单元

本文设计了一种用于功率开关的新型模块化隔离正激式有源缓冲单元（SC）。在所提出的新型 SC 中，零电压转换（ZVT）技术是通过正向转换器实现的，而目前的同类产品通常使用反激式转换器。在采用新型 SC 的转换器中，主开关通过 ZVT（全零电压开关 [ZVS]）接通，通过 ZVS 关断，主二极管通过零电流开关 (ZCS) 关断，辅助开关通过 ZCS 接通，通过 ZVS 关断，寄生电容的能量得到回收。此外，由于采用了正向转换器，变压器漏感得以最小化，并大大降低了新型 SC 中器件的电流值。以单相、并网、T 型三电平逆变器（T2-3LI）为例，介绍了新电池的应用。我们对该逆变器进行了详细的稳态分析，并通过 100 kHz 和 3.3 kW 值的原型机测量结果证实了理论分析。与硬开关（HS）等效逆变器相比，采用软开关（SS）单元的逆变器的总电路损耗从 248 W 降至 86 W，总效率从 92.5% 提高到 97.4%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.