5KW全數(shù)字控制單級(jí)隔離型功率因數(shù)校正變換器的研究

摘要：針對(duì)當(dāng)前工業(yè)界某些應(yīng)用場(chǎng)合對(duì)高功率等級(jí)、嚴(yán)格的諧波標(biāo)準(zhǔn)以及輸入輸出隔離等要求，本文提出了一種新的結(jié)合主電路拓?fù)浜腿珨?shù)字控制技術(shù)的解決方案。文章采用單級(jí)隔離型全橋結(jié)構(gòu)結(jié)合傳統(tǒng)BOOST型PFC的輸入電感和RCD鉗位作為主電路，并融合數(shù)字控制方案，對(duì)中大功率單級(jí)隔離型PFC進(jìn)行研究。分析了主電路工作原理，建立了小信號(hào)動(dòng)態(tài)模型，并詳細(xì)分析了基于該模型的數(shù)字控制設(shè)計(jì)方法。提供輸入輸出電氣隔離的變壓器，允許輸出可以在較大范圍內(nèi)調(diào)整，既可以高于輸出電壓也可以低于輸出電壓，此外允許多路輸出方案。因此，變壓器的加入大大拓展了此類PFC變換器的使用場(chǎng)合。采用的數(shù)字控制方案，同時(shí)具有良好的動(dòng)態(tài)響應(yīng)特性和穩(wěn)態(tài)調(diào)節(jié)特性。優(yōu)異的動(dòng)態(tài)調(diào)節(jié)特性可成功解決模擬控制引入的變壓器偏磁現(xiàn)象。基于本文所提出的拓?fù)湟约翱刂品桨福�制作�?kW輸出功率且開關(guān)頻率為55kHz的樣機(jī)，驗(yàn)證了該變換器的優(yōu)良性能，滿載功率因數(shù)達(dá)到0.994，效率超過(guò)92%。 敘詞：單級(jí)隔離 全橋 功率因數(shù)校正 偏磁 數(shù)字控制 Abstract：Dedicated to industry requirement of high power level, rigorous harmonic standard and isolation between input and output, a novel solution that combines the main topology and fully digital control strategy is presented in this paper. This paper deals with a power factor correction (PFC) converter based on the topology of isolated of BOOST type PFC and RCD clamping circuit, which features that clamping capacitor can partly return stored energy and that contributes to increase efficiency, furthermore fully digital and its digital control design consideration based on the small-signal dynamic mathematical model of the very converter are respectively specified in this paper. A transformer being used to provide PFC converter. The adopted digital control strategy features fast dynamic response and excellent steady regulation characteristic. Problem of magnetic bias for the transformer that occurs in application of analogy control is successfully solved for excellent performance of digital controller. The above excellent performances of the converter are verified by an experimental prototype, whose output power is 5KW and PFC operation frequency is 55K. Furthermore, such specifications as PF value and efficiency are respective 0.994 and more than 92%. Keyword：Single-stage isolated, full-bridge, power factor correction, magnetic bias, digital control