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Buck-Boost雙向變換器研究

摘要：文中對(duì)軟開(kāi)關(guān)Buck-Boost雙向變換器進(jìn)行了研究。根據(jù)電感電流的不同，變換器共有5種不同的工作方式。文中對(duì)電感電流過(guò)零的三種工作方式進(jìn)行了詳細(xì)的原理分析。分析表明：這三種工作方式下，變換器均可實(shí)現(xiàn)MOS開(kāi)關(guān)管的軟開(kāi)關(guān)和體二極管的自然開(kāi)通、關(guān)斷，無(wú)反向恢復(fù)問(wèn)題。通過(guò)對(duì)48V/24V雙向變換器的設(shè)計(jì)實(shí)例，對(duì)能量雙向工作下的控制環(huán)進(jìn)行的參數(shù)設(shè)計(jì)及仿真調(diào)整驗(yàn)證表明，控制參數(shù)的合理選取可以使該變換器在Buck及Boost工作方式下均能穩(wěn)定工作，具有實(shí)用價(jià)值。 敘詞：變換器；雙向；Buck-Boost；零電壓開(kāi)關(guān) 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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