四管Buck-Boost变换器的改进型三模式变频软开关控制策略

doi:10.19595/j.cnki.1000-6753.tces.201549

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摘要

四管Buck-Boost变换器（FSBB）具有无源元件少、开关管电压应力低、输入输出电压同极性、控制自由度多等优势,非常适用于宽输入电压的预调节器。该文对传统三模式控制的中间模式进行优化,提出一种改进型三模式控制策略,降低了导通损耗,提升了变换器工作效率。为进一步提高功率密度、降低高频硬开关带来的开关损耗和电磁干扰,该文提出变频控制策略,能够在全电压范围内实现软开关。分析表明,改进型三模式控制可优化变频范围,与变频软开关控制具有很好的契合度。在实验室研制了一台输入80~160V,输出125V/300W的原理样机,验证了所提控制策略的正确性,并通过效率对比和损耗分析证明所提控制策略有利于FSBB实现高效率和高功率密度。

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	方天治
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	蓝建宇

关键词 ：四管Buck-Boost变换器, 改进型三模式控制, 变频控制, 软开关, 电感电流

Abstract：

The four-switch Buck-Boost converter has the advantages of fewer passive components, low voltage stress of switches, the same polarity of input voltage and output voltage, and more freedom of control. And it is very suitable for pre-regulators with wide input voltage. In this paper, an improved three-mode control strategy is proposed to optimize the intermediate mode of the traditional three-mode control, which can reduce the conduction loss and improve the efficiency of FSBB. To further increase power density and reduce the switching loss and electromagnetic interference caused by high-frequency hard switching, this paper proposes a variable frequency control strategy to achieve soft switching in the full voltage range. Analysis shows that the improved three-mode control can optimize the frequency conversion range, so it has a good fit with the variable frequency soft switching control. A prototype with input 80~160V and output 125V/300W was developed in the laboratory to verify the correctness of the proposed control strategy. Through efficiency comparison and loss analysis, it is proved that the proposed control strategy is beneficial to FSBB to achieve high efficiency and high power density.

Key words： Four-switch Buck-Boost improved three-mode control variable frequency control soft switching inductive current

收稿日期: 2020-11-23

PACS:

TM46

基金资助:

2020年度空间电源技术国家重点实验室源创基金和南京航空航天大学研究生创新基地（实验室）开放基金（kfjj20190310）资助项目

通讯作者: 方天治男,1977年生,博士,副教授,研究方向为串并联组合逆变器、并网逆变器、电力电子系统集成。E-mail：fangtianzhi@126.com

作者简介: 王愿女,1996年生,硕士研究生,研究方向为高频变换器及其软开关技术、电力电子系统集成。E-mail：yuan_wang158@126.com

引用本文:

方天治, 王愿, 张惠丽, 张雨, 沈姝衡, 蓝建宇. 四管Buck-Boost变换器的改进型三模式变频软开关控制策略[J]. 电工技术学报, 2021, 36(21): 4544-4557. Fang Tianzhi, Wang Yuan, Zhang Huili, Zhang Yu, Sheng Shuheng, Lan Jianyu. An Improved Three-Mode Variable Frequency Control Strategy Based on Four-Switch Buck-Boost Converter. Transactions of China Electrotechnical Society, 2021, 36(21): 4544-4557.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201549 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I21/4544

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