一种基于耦合电感的高增益软开关谐振变换器

doi:10.19595/j.cnki.1000-6753.tces.221942

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摘要

本文提出了一种具有高增益、软开关的新型的谐振变换器。该谐振变换器使用耦合电感来提高电压增益,升压比不仅取决于占空比,还取决于耦合电感的变比,具有高增益的优点;此外,由于采用了有源钳位技术,漏感中的能量可以被回收利用,用来对开关管的结电容充放电提供能量,从而实现软开关。由于采用了耦合电感,本文所提出的变换器可以在较低的开关管电压应力的情况下实现较高的输出电压,因此可以使用低导通电阻的低压器件,从而提升系统的效率。本文分析了该谐振变换器的工作原理,并推导得到了输出电压、关断电流应力等参数的解析表达式。在此基础上,从理论上分析了该变换器取得软开关的条件,并对该变换器的各个器件的电压电流应力进行分析,为器件选型提供了理论依据。最后,本文搭建了1kW实验样机,针对本文提出的基于耦合电感的谐振变换器的高增益、软开关、低电压应力、高效率等性能进行了实验验证。本文所提出的拓扑可以在10倍增益的情况下达到最高97.5%的效率,验证了本文提出的拓扑的优越性。

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关键词 ：耦合电感, 谐振变换器, 高增益, 软开关

Abstract：

Fuel cell is a kind of clean energy with high efficiency and high power density, which has a good application prospect in automobile, aerospace and other fields. This paper presents a new type of resonant converter with high gain and soft switching for fuel cell. The resonant converter uses the coupling inductor to improve the voltage gain. The topology mainly consists of two parts: Boost circuit and resonant circuit. The resonant circuit is superimposed on the Boost circuit, and the output voltage of the two is superimposed to increase the voltage gain. The Boost circuit consists of the magnetic inductance of the coupled inductor and two switches, the auxiliary switches are equivalent to ordinary Boost diodes. The circuit is a unidirectional high-gain circuit. The purpose of using MOSFETs in the auxiliary switches is not to achieve bidirectional energy flow, but to ensure that the main switches can realize zero voltage opening and improve efficiency. The active clamping technique is used for the primary soft switch and synchronous rectification to reduce losses. The resonant circuit is composed of the auxiliary side of the coupled inductor, the leakage inductance of the coupled inductor, the resonant capacitor, two diodes and the output capacitance.
The voltage boost ratio depends not only on the duty ratio, but also on the variation ratio of the coupling inductor, which has the advantage of high gain. In addition, due to the active clamp technology, the energy in the leakage inductance can be recovered and utilized to provide energy for the charging and discharging of the junction capacitor of the switches, so as to realize the soft switching. Due to the coupled inductor, the proposed converter can achieve higher output voltage at lower voltage stress, so low voltage devices with low on-resistance can be used to improve the efficiency of the system. In this paper, the operation principle of the proposed converter is analyzed, and the expressions are derived theoretically. On this basis, the conditions of obtaining soft switch of the converter are analyzed theoretically. Besides, the voltage and current stress of each device of the converter are analyzed and the selection method of the output capacitor is given, which provides a theoretical basis for device selection.
In the experiment, a 1kW rated prototype is made, and the experiment is carried out for the performance of the proposed converter, such as high step-up, soft switching, low voltage stress, high efficiency and etc. The input voltage is 40V and the output voltage is 380V, which can realize the 9.5 voltage gain. All switching tubes can realize ZVS soft switching operation, and all diodes can realize ZCS operation. Because all switches have soft switching operation, and the switching current stress is small, the peak efficiency of the proposed converter is about 97.5% under 10 times boost ratio which verifies the superiority of the proposed topology.

Key words： Coupled inductor resonant converter high step-up soft switching

收稿日期: 2022-10-10

PACS:

TM131.3

基金资助:

广东省重点领域研发计划资助项目(2020B0909030003)

通讯作者: 郑泽东, 男,1980年生,副教授,博士生导师,研究方向为高性能交流电机控制、高压大容量电力电子变换器及其应用、轨道交通电力牵引、船舶电力推进等。E-mail：zzd@mail.tsinghua.edu.cn

作者简介: 王哲, 男,1997年生,博士,研究方向为燃料电池DCDC变换器。E-mail：wangzhe19@mails.tsinghua.edu.cn

引用本文:

王哲, 李驰, 郑泽东, 李永东. 一种基于耦合电感的高增益软开关谐振变换器[J]. 电工技术学报, 0, (): 8908-. Zhe Wang, Chi Li, Zedong Zheng, Yongdong Li. A High Step-up ZVS/ZCS Resonant Converter Based on Coupled Inductor. Transactions of China Electrotechnical Society, 0, (): 8908-.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.221942 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/8908

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