Un iform energy conservation average models of sw itch ing converters
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1 EL ECTR ICMACH IN ESANCON TROL Vol3 No4 July 2009 ( 6023) : buck boost buck2boost :; ; ; : TM 3 : A : X (2009) U iform eergy coservatio average models of sw itch ig coverters Q IU Yig CHEN Xi2you (epartmet of Electrical ad Electroics Egieerig alia Uiversity of Techology alia 6023 Chia) Abstract: To cope w ith the p roblem of coversio betwee topology depedet models of differet co2 verters a uiform dc ad sm all2sigal models fo r both isolated ad o2isolated buck boost ad buck2 boost coverters ad its ope2loop trasfer fuctios i cotiuous coductio mode ( CCM ) are estab2 lished based o the eergy coservatio averagig p ricip le. B y trasferrig the parasitic param eters ad iductor equivaletly ito the brach i series coectio w ith output capacito r the models are ui2 fied ad the parasitic param eters are cotaied. The coversio betwee differet models ca be easily realized by simp ly chagig the topology factors. It ca be beeficial whe comparig differet covert2 ers. Models ad exp ressios ca be also app lied for sychroous rectifier mode. The p roposed model is validated by detailed sim ulatio ad is show to accurately p redict sm all2sigal frequecy dom ai char2 acteristics. Key words: sw itchig mode coverter; eergy coservatio; parasitic param eters; sm all2sigal model 0 [ - 3 ] [ 4 ] [ 5 ] : : (982) ; (962).
2 560 3 [ 6 ]buck2boost cuk sep iczeta buckboost buckboost [ 7 ] [ 8-3 ] buck boost buck2boost 3 R F U F ; R T R T2 ; R S ; R L R C ; I L I S ; : ; buck buck I L ; I SRM S T T 0 i 2 s dt I L () : T f P ST I 2 SRM S (R S + R T ) I2 L (R S + R T ) 2 (2) P ST R SAV I 2 L (3) R SAV (2)(3) R SAV (R S + R T ) 2 (4) R T2 R F R L R E
3 4 56 Table Equ iva le t param eters R E R E2 L E N ( s) buck R S + R T R C R 2 ( - ) 2 L 2 + R T2 + R F + R L 2 ( fl ) 2 boost buck2boost R S 2 ( - ) 2 + R L 2 ( - ) 2 + R T 2 ( - ) + R F + R T2 - (R S + R T ) R L 2 ( - ) ( - ) 2 + R F + R T2 - R C - R C - K 2 4 L K 2 4 L K L E R s - L E R s [ 8 ] I CRM S U O ( - ) (5) 2fL (5) R E2 R C R 2 ( - ) 2 2 ( fl ) 2 (6) (6) buck U T I I U T U I (7) I I I L (8) d + d^ d^ U T + ^u t + d^ I I + i^i + d^ (U I + ^u i ) U I + ^u i + U I d^ d^ + ^u i (9) ( I L + i^l ) I L + i^l + I L d^ + d^ i^l (0) (9) (0) buck 2boost 2 boostl L E L 2 ( - ) 2 () L E I L ( - ) I SRM S T T i 2 s d t 0 I L ( - ) (2) (2) R SAV (R S + R T ) 2 ( - ) 2 (3) R E ( ) boost buck I CRM S ( - ) I L (4) ( 4) R E2 R C (5) - U T + ^u t (U I + ^u i ) ( - - d^) U I ( - ) + ^u i ( - ) + d ^U I ( - ) 2 ( I L + ^ il ) I I + i^i ( - - I L d^) ( - ) + ^ il ^ d IL ( - ) + ( - ) 2 + d ^ ( ^ui + ^u t ) ( - ) + d ^ ( d^ l + ^ i ) ( - ) (6) (7) boost (6) (7) I O I O I L I O I O + i^o ( - - d^ ) ( I L + i^l ) - ^ i^ l d^ I L I L + i^l d (8) - (6) (7)(8) boost
4 buck2boost buck2boost buckboost [ 6 ] buck2boost L boost buck2boost boost buck2boost 2 3 ; ; ( 9 ) ( 0 ) ( 6 ) ( 7 ) (8) K 3 N ( s) Table 2Topology factor of coverter K K 2 K 3 K 4 buck boost buck - boost ( - ) ( - ) ( - ) 2 - ( - ) 2-0 ( - ) ( - ) ( - ) ( - ) 3 [ 8 ] P S fc O U 2 I fc O R P O (9) : C O P O U O I O U I I I + R E R K 2 + U F U O + fc O R K 2 (20) (20) ; boostbuck2boost M V ( s) ^u o ( s) ^u i ( s) K R C R L E (R + R C ) T P ( s) ^u o ( s) ^d ( s) Z O ( s) ^u o ( s) ^i o ( s) Z I ( s) ^u i ( s) ^i i ( s) K 2U I R C R L E (R + R C ) s + C + 2 r r s + 2 r (2) ( s + C ) N ( s) + 2 r r s + 2 r ( s + C ) ( s + L ) R C + 2 O Q s + L E K 2 2 O (22) (23) + 2 r r s + 2 r s + cr (24)
5 4 563 : Q 2 C ( R E + R E2 + R C ) C L E CR C L R E + R E2 r L E R + R E + R E2 L E C (R + R C ) O L E C r C [ R C R + R (R E + R E2 ) + R C (R E + R E2 ) ] +L E 2 L E C (R + R C ) (R + R E + R E2 ) cr (25) C (R + R C ) boostbuck2boost boostbuck2boost Z C ( s) Z O ( s) + T L ( s) (26) : Z C Z O T L Z C (s) + T L (s) Z O (s) - T L (s) + T L (s) K 2 (R +R E )N (s) - (27) R T R T2 0 buck U F R F - ; boostbuck2boost U F 0 R F R S R E ( 2) (24) 3 boost : R S 0 U F 0. 3 V R F 0 R T 02 R T2 0 C 00F R C 00 L 200H R L 0 R U I 2V f 00 khzmatlab Saber
6 boost - 40 db /dec 80 7 boost rad / s ; Saber 4 buckboostbuck2boost boost buck boost buck2boost : [ ] ZHANG J M X IE X G J IAO Z et al. Stability problem s ad iput impedace improvemet for cascaded power electroic systems [ C ] / / IEEE Applied Power Electroics Coferece ad Expositio Aaheim Califoria USA February : [ 2 ]. [ J ] (23) : REN Xiaoyog RUAN Xibo. Two2stage coverter applicable to high voltage iput low voltage output case[ J ]. Proceedigs of the CSEE (23) : [ 3 ]. C /C [ J ] (6) : CHEN Yi XU ehog WU Xiaofeg. Magetic itegratio struc2 ture for two2stage C2C coverters [ J ]. Electric M achies ad Cotrol (6) : [ 4 ] M ILEBROOK R CUK S. A geeral uified app roach to mod2 elig switchig coverter power stages[ C ] / / IEEE Power Electroics Specialists Coferece Clevelad Ohio USA Jue : [ 5 ] SZABO A KAMSARA M WAR E S. A uified method for the small2sigal modellig of multi2resoat ad quasi2resoat covert2 ers[ C ] / / IEEE Iteratioal Sym posium o Circuits ad System s Moterey CA May 3 - Jue 3 998: [ 6 ] WU T F CHEN Y K. A systematic ad uified approach to modelig PWM C /C coverters based o the graft scheme[j ]. IEEE Tras2 actios o Idustrial Electroics () : [ 7 ] SUNTIO T. Uified average ad small2sigal modelig of direct2o2 time cotrol [ J ]. IEEE Trasactios o Idustrial Electroics () : [ 8 ] CZARKOWSKI KAZIM IERCZUKM K. Static2ad dyam ic2cir2 cuit models of PWM buck2derived C2C coverters circuits[ J ]. IEE Proceedigs G (6) : [ 9 ] YAO KW XU M MENG Y et al. esig cosideratios for VRM trasiet respose based o the output impedace [ J ]. IEEE Trasac2 tios o Power Electroic003 8(6) : [ 0 ] BRYANTB KAZIM IERCZUKM K. Ope2loop power2stage tras2 fer fuctios relevat to curret2mode cotrol of boost PWM co2 verter operatig i CCM [ J ]. IEEE Trasactios o Circuits ad System s: I (0) : [ ] REATTI A KAZIM IERCZUK M K. Small2sigal model of PWM coverters for discotiuous coductio mode ad its app licatio for boost coverter[ J ]. IEEE Trasactios o Circuits ad System s: I () : [ 2 ] BRYANT B KAZIM IERCZUKM K. Voltage loop of boost PWM C2 C coverters with peak curret2mode cotrol[j ]. IEEE Trasactios o Circuits ad System s: I () : [ 3 ] BRYANT B KAZIM IERCZUK M K. Modelig the closed2curret loop of PWM boost C2C coverters operatig i CCM with peak curret2mode cotrol[ J ]. IEEE Trasactios o Circuits ad Sys2 tem s: I () : ( : )
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