適用于混合動(dòng)力汽車的DC/DC變換器低損耗控制方法
上傳時(shí)間:2015/7/25 11:10:16
摘要:提出了一種雙向級(jí)聯(lián)升降壓變換器的低損耗、恒頻、零電壓開關(guān)的控制方法 ,可應(yīng)用于混合動(dòng)力汽車中。通過和傳統(tǒng)控制方法對(duì)比,討論了其優(yōu)點(diǎn)和軟開關(guān)解決方案。在這種控制方法下,每個(gè)脈沖周期的開始和結(jié)束時(shí),產(chǎn)生一個(gè)負(fù)向的偏置電流,使開關(guān)器件導(dǎo)通,這樣MOSFET開關(guān)管就可在反向并聯(lián)二極管導(dǎo)通時(shí)開通。由于這種控制方法是純軟件解決方案,與傳統(tǒng)控制方法相比,更具有成本優(yōu)勢(shì)。該模型的工作理論和軟開關(guān)的工作過程,通過變換器樣機(jī)進(jìn)行了實(shí)驗(yàn)驗(yàn)證。
敘詞:零點(diǎn)壓開關(guān) 雙向級(jí)聯(lián) 混合動(dòng)力汽車 直流變換器
Abstract:A low-loss, constant-frequency, zero-voltage-switching (ZVS) modulation strategy for bi-directional cascaded, buck-boost DC/DC converters, used in a hybrid electrical vehicle (HEV), is presented and its benefits over state-of-the-art converters and soft-switching solutions are discussed in a comparative evaluation. With the purposed modulation strategy, the switches are gated in a way that the inductor current has a negative offset current at the beginning and the end of each pulse period. This allows the MOSFET switches to turn on when the anti-parallel body diode is conducting. As the novel modulation strategy is a software-only solution, there are no additional expenses for active or passive components compared to conventional modulation implementations. Experimental measurements performed with a converter prototype verify the mode of operation and the ZVS principle.
Keyword:ZVS, Bi-directional cascaded, HEV, DC/DC Converter
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