欢迎来到天天文库
浏览记录
ID:57022896
大小:243.94 KB
页数:13页
时间:2020-07-31
《开关电源LLC converter动作原理.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-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)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
2、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/D
3、C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、ter(2)•Operationbelowseries-resonantfrequencyS1f5、ationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperationofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS6、2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
4、ter(2)•Operationbelowseries-resonantfrequencyS1f5、ationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperationofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS6、2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
5、ationofLLCConverter(4)iS1S1vDS1S2LrivLrinvLmprivds2ZVSiS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri9ODOperationofLLCConverter(5)S1S2LriLrLmvprivds2iS2iS2vs1DS2vCrDS2vpriiiLmODivLroutCoD2LriLrvCrvprivCCrri10ODOperationofLLCConverter(6)S1S2LriLrLmvprivds2iS2S2vis1DS2vCrDS
6、2vpriiLmiLrPrimarySide等效電路LrivCrLriLmLmvCrCri11ODOperationofLLCConverter(7)iS1S1vDS1S2DLrS1ivLrinvvZVSLmprids2iS2is1vDS2vCrvDpri1iiLmODiLrvoutCoPrimarySide等效電路vDS1LrviCrLriLmLmVvDS2invCrCriOD1213
此文档下载收益归作者所有