Buck-Boost双向变换器研究
作者:朱德明 秦海鸿 严仰光 上传时间:2004/12/23 11:58:16
摘要:文中对软开关Buck-Boost双向变换器进行了研究。根据电感电流的不同,变换器共有5种不同的工作方式。文中对电感电流过零的三种工作方式进行了详细的原理分析。分析表明:这三种工作方式下,变换器均可实现MOS开关管的软开关和体二极管的自然开通、关断,无反向恢复问题。通过对48V/24V双向变换器的设计实例,对能量双向工作下的控制环进行的参数设计及仿真调整验证表明,控制参数的合理选取可以使该变换器在Buck及Boost工作方式下均能稳定工作,具有实用价值。
叙词:变换器;双向;Buck-Boost;零电压开关
Abstract:In the paper, research on a soft-switching bi-directional buck-boost converter is presented. The converter has 5 different operation modes when inductor current is different. The operation of three modes under the conditions that inductor current passes through zero is detailed. Analysis results reveal that under these three operation modes, the zero-voltage-switching of MOSFETs can be obtained, and the MOSFET body diodes can also be turned on and off naturally without reverse recovery problem. Finally a design example of a 48V/24V bi-directional buck-boost converter is presented. The appropriate choice of control loop parameters can make the converter stable at buck and boost operation modes respectively, and it testifies that the proposed soft-switching bi-directional buck-boost converter is practical and feasible.
Keyword:Converter; Bi-directional; Buck-Boost; Zero-voltage-switching
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