基于掉电保持的LLC变换器研究综述

doi:10.11985/2021.02.015

摘要/Abstract

摘要：

LLC变换器因其软开关的优点在近年来得到了广泛应用。传统LLC变换器采用变频控制,在开关频率范围受到约束的情况下难以实现宽电压输入,从而导致LLC变换器掉电后保持时间短,在UPS等领域应用时受限。针对此类问题,国内外已有许多可用于掉电保持的宽电压输入范围LLC变换器的研究成果。对传统LLC增益范围窄的问题进行了简单的分析,从控制策略上和电路结构上对这些研究成果进行了归纳并分析其优缺点。

关键词: LLC, 软开关, 掉电保持时间, 宽电压输入范围

Abstract:

LLC converters have been widely used in recent years because of their soft switching advantages. Traditional LLC converters use variable frequency control. It is difficult to achieve a wide voltage input when the switching frequency range is constrained. As a result, LLC converter has a short hold-up time after power failure, and is limited in applications such as UPS. In response to this kind of problem, many domestic and foreign research results of wide-voltage input range LLC converters that can be used for hold-up emerge. The problems of the narrow range of the traditional LLC gain are analyzed, the research results from the control strategy and circuit structure are summarized, and the advantages and disadvantages of them are analyzed.

Key words: LLC, soft-switching, hold-up time, wide voltage input range

中图分类号:

TM46

熊宣, 赵慧, 陈宗祥. 基于掉电保持的LLC变换器研究综述[J]. 电气工程学报, 2021, 16(2): 115-121.

XIONG Xuan, ZHAO Hui, CHEN Zongxiang. Review on LLC Converter Based on Hold-up[J]. Journal of Electrical Engineering, 2021, 16(2): 115-121.

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改进方案		参数				优缺点
种类	关键点	额定电压/功率/(V/W)	输入电压范围/V	开关频率范围/kHz	谐振频率/kHz	优缺点
控制策略	调节PFC^[13,14]	310.5/1 000	320~420	~200	200	无需附加电路,但可调范围有限
	不对称控制^[15]	18.5/85	300~400	61~100	100	不对称控制引起偏置电流
	全桥半桥切换^[17]	500/2 000	125~550	40~120	60	参数设计相对复杂
初级侧网络	初级侧附加开关^[19]	20/50	85~340	~500	500	开关管过多,控制相对复杂
	初级侧附加开关^[20]	385/6 600	225~378	90	78	开关管过多,控制相对复杂
	Boost前级^[21]	15/300	36~72	80~100	100	不对称控制引起偏置电流
	交错Boost前级^[22]	24/600	120~240	~100	100	不对称控制引起偏置电流
副边整流器	附加绕组^[23]	311/300	25~42	~130	130	变压器相对较大
	整流器切换^[25]	400/1 500	100~420	94.37~236.6	170	增益较大,但参数设计相对复杂
	四倍整流切换^[26]	400/1 500	100~500	70~150	100	增益较大,但参数设计相对复杂
	副边短路^[27]	200/300	250~400	34~75	75	电路结构改变小,切换过程没有过大的过冲问题,并控制简单
	副边短路^[28]	12/300	250~400	120~200	200	电路结构改变小,切换过程没有过大的过冲问题,并控制简单
谐振腔	附加变压器^[29]	210/250	25~100	80~140	140	切换过程有较大的过冲问题,参数设计也相对复杂
	可变电感^[32]	56/350	290~405	75~110	110
	可变电容^[33]	56/350	325~385	34~106	90
	谐振腔附加开关^[35]	12/300	250~400	150~260	260	不对称控制引起偏置电流
	谐振腔附加开关^[36]	48/1 000	200~390	70~100	100	增益较大,控制简单