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时间:2019-09-05
《开关电源LLC converter动作原理》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、LLCResonantPowerConverter動作原理簡介Reporter:SeanHsia(夏存孝)Date:2007/07/191Outlines•LLCConverterIntroduction•OperationofLLCConverter•CurrentofOutputDiode&SwitchingFrequency•DCVoltage-ConversionRationOfLLCConverter2LLCConverterIntroduction(1)優點:(1)電路架構簡單(2)
2、零電壓切換:可提高切換頻率,高輸入電壓下高效率得以實現(3)消除輸出二極體的反向恢復問題(4)輸出整流二極體電壓應力最小化(約等於兩倍輸出電壓)(5)變壓器漏感及磁化電感可當諧振元件,諧振元件體積大幅縮小(6)LLC轉換器內部產生的熱量小,無須使用風扇散熱缺點:(1)變頻控制(2)回授補償設計及EMI設計較難(3)多模塊輸出均流時,開關頻率可能並不相同,輸出紋波與雜訊中將存在很多隨機頻率成分(4)輕載效率較差3LLCConverterIntroduction(2)常用的電力電子轉換器架構︰提升效
3、率&降低溫度Forward和Flyback兩種,效率改變轉換器架構大致上為介於80%到85%之間ZVS共振式架構1.提升DC/DC整體效率︰95%左右2.降低Q7&Q8切換損失4LLCConverterIntroduction(3)利用變壓器的漏感來進行共振電感設計,故變壓器設計為此電路重點之一Turn-onTurn-off5OperationofLLCConverter(1)•Operationbelowseries-resonantfrequencySf4、1S1vvds2DS1DLrS1is1ivLrinvLmprivpriiS2iLmiSvLr2DS2vCrDS2D1iODvoutCovCrD2iOD6OperationofLLCConverter(2)•Operationbelowseries-resonantfrequencyS1f5、CCrri7ODOperationofLLCConverter(3)iSS11S1vS2DS1DLrS1ivLrvinvds2Lmpriis1vCrvpriiLmiLrPrimarySide等效電路LrvCriLriLmLmVinvCrCri8ODOperationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperatio6、nofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS7、1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
4、1S1vvds2DS1DLrS1is1ivLrinvLmprivpriiS2iLmiSvLr2DS2vCrDS2D1iODvoutCovCrD2iOD6OperationofLLCConverter(2)•Operationbelowseries-resonantfrequencyS1f5、CCrri7ODOperationofLLCConverter(3)iSS11S1vS2DS1DLrS1ivLrvinvds2Lmpriis1vCrvpriiLmiLrPrimarySide等效電路LrvCriLriLmLmVinvCrCri8ODOperationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperatio6、nofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS7、1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
5、CCrri7ODOperationofLLCConverter(3)iSS11S1vS2DS1DLrS1ivLrvinvds2Lmpriis1vCrvpriiLmiLrPrimarySide等效電路LrvCriLriLmLmVinvCrCri8ODOperationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperatio
6、nofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS
7、1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
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