A Novel Isolated Buck-Boost Converter

Transcription

1 ovel Isolaed Buck-Boos onverer Soo-Seok Km *, WOO-JI JG, JOOG-HO SOG, Ok-Koo Kang, and Hee-Joon Km ep. of Elecrcal Eng., Seoul aonal Unversy of Technology, Korea School of Elecrcal and ompuer Eng., Hanyang Unversy, Korea E-mal: bsrac Ths paper proposed a novel Isolaed Buck- Boos PW - converer crcu. The opology whch merged buck-boos mode wh flyback mode can share he ransformer and swch. o only solaed buck-boos mode curren bu also flyback mode curren added on he one oupu curren of he converer because he opology merged buck-boos mode wh flyback mode. new converer has ousandng advanages over he convenonal dc-dc converers wh respec o hgh effcency, hgh power densy, and componen ulzaon. The operaon prncple of he proposed converer s descrbed and verfed by smulaon and expermen resuls. lso hs paper presens novel crcu and smulaon resul of new acve solaed buck-boos converer. I. ITOUTIO ecenly, a Swched-ode Power Supply s wdely used as a power equpmen o supply a sable power o an elecronc crcu par of all of elecroncs and communcaon equpmens such as porable elecom devces, elecommuncaon power sysem, power condonng sysem for renewable energy ec. There are wo ypes of he solaed converer of whch man swch uses only a sngle one: one s a forward ype whch ransfers power when a swch s urned on, and he oher s a flyback ype whch ransfers power when a swch s urned off. The solaed - converer s more effcen han non-solaed converer because of mos applcaons requre he solaon beween he npu and he oupu. Therefore, f possble, s desrable o make he - converer n he form of an solaed ype. However, he effcency of solaed - converers s lmed because solaed - converers can ransfer energy of a prmary crcu o a secondary crcu only when a swch s urned on or off. ccordngly, hs paper presen a new ype of solaed buck-boos converer whch can ncrease he effcency of he converer. II. ISOTE BUK-BOOST OETE Fg. shows new solaed buck-boos converer hereafer called IBB converer. IBB converer accordng o a Fg. n whch an npu crcu s solaed from an oupu crcu by a ransformer T, wheren he npu crcu comprses a source, a prmary col of he ransformer T conneced n seres o he source, and a swch Q whch s conneced n seres o he prmary col of he ransformer T and whch performs on/off swchng; and wheren he oupu crcu comprses a secondary col of he ransformer T correspondng o he prmary col of he ransformer T, an nducor conneced n parallel o he secondary col of he ransformer T, a dode of whch cahode s conneced o one node beween he secondary col of he ransformer T and he nducor, a capacor conneced o he oher node beween he secondary col of he ransformer T and an anode of he dode, and a load ressor conneced n parallel o he capacor. Proposed converer performs as a buck-boos converer. I can eher ncrease or decrease he magnude of he dc volage of he converer. ergng buck-boos converer wh flyback opology can share he ransformer and power OSFET. o only solaed buck-boos mode curren bu also flyback mode curren added on he one oupu curren of he converer. new converer has ousandng advanages over he convenonal dc-dc converers wh respec o hgh effcency, hgh power densy, and componen ulzaon. Fg.. ovel IBB onverer.. Behavor of novel IBB converer The proposed IBB converer s analyzed. There are wo opologcal saes n one swchng cycle. The equvalen crcus for hese saes are shown n Fg.. ow we explan he operaon of he crcu shown n Fg.. For hs descrpon of crcu operaon, he followng assumpons are made /9/$. 9 IEEE

2 Ideal swchng componens. Seady-sae operaon. Sage : If he swch Q s urned on -, he npu volage n s suppled o he prmary poron of he ransformer and he npu energy s hen sored n he nducor. ow, he dode s reverse-based and hus s urned off. Therefore, he buck-boos converer crcu s operaed as shown n Fg.. Fg.. Sage a -. In hs case, le a volage of source S be n, a swch urn-on ressor be on, a ransformer magnezng nducance be, a magnezng curren be I, he nducance of an nducor be, an nducor curren be I, he oupu volage be o, and a rao of urns of he prmary col o he secondary col be /, he crcu equaon are as follows: U Y k Where ] [ o z K on on B Sage : lso, when he swch Q s urned off -, he dode s forward-based and hen s urned on. Therefore, he solaed buck-boos crcu s operaed as shown n Fg. 3. In such a crcu, he energy sored n he nducor s dscharged o a load ressor, and also he energy sored n he magnezng nducor s dscharged va he secondary col of he ransformer. nd, he nducor curren I and he curren I S on he secondary col of he ransformer are added o a dode curren. onsequenly, he followng equaon s esablshed: Fg. 3. Sage a -. Y k Where ] [ o K B

3 In he seady sae, a analyss by he duy rao s as follows: Y BU B U on on B 3 o n So he converson rao of he proposed converer s smlar o he buck-boos converer, bu conans an added facor of. Where nd also, he oupu curren I o consss of he nducance curren I and he ransformer magnezng curren I. I can be undersood ha when, he oupu of he solaed buck-boos converer ncreases n power and he curren of he buck-boos mode and he curren of he flyback mode are combned no one oupu curren of he converer. Fg. 4 shows he me sequence of gae drve volages for swch Q, he man swch volage S, he man swch curren I s, he curren hrough ransformer col of secondary sde I s, he dode curren I, and he nducor curren I. 9 If, on o n 4 I I 5 From equaon 4,5 o n 6 I I o 7 Io o 8 Fg. 4. Key Waveform of he IBB converer. B. ovel cve lamp IBB onverer Fg. 5 shows new acve clamp IBB converer. nd Fg. 6 shows he key waveform of he acve clamp IBB converer. The auxlary swch Q s used o provde a pah for recyclng he magnezng energy. The new converer s feaures are as he followng advanages. Boh he man and auxlary swches operae wh zero volage swchng. Sof swchng can be mananed for full lne range and load range. Where I o I I

4 hrough ransformer col of secondary sde I s, he dode curren I, and he nducor curren I. Fg. 5. ovel cve lamp IBB onverer. Fg. 8. Expermen Waveforms of he IBB onverer. Fg. 6. Key Waveforms of he cve lamp IBB onverer. III. SIUTIO EPEIET ESUT We dd he smulaons usng he Fg. crcu and Fg. 5 crcu for proposed converer. The smulaon was done wh 5% duy rao. The smulaon and expermen resuls of he IBB converer are presened n Fg. 7, Fg. 8 and Fg. 9. Fg. 9. Expermen Waveforms of he IBB onverer. Fg. 8, Fg. 9 shows he man swch volage S, he dode curren I, and he nducor curren I. The smulaon and expermen resuls agree well wh he heorecal waveforms. nd also we could denfy ha he IBB converer s oupu curren Io consss of he nducance curren I and he ransformer magnezng curren I hrough he expermen waveform of he dode curren I, and he nducor curren I. From he smulaon and expermen resuls, he proposed converer could ransfer energy of a prmary crcu o a secondary crcu when a swch s on and off because solaed - converers whch man swch uses only a sngle one can ransfer energy of a prmary crcu o a secondary crcu only when a swch s urned on or off. Fg. 7. Smulaon Waveforms of he IBB onverer. nd we also do he smulaon for a new acve clamp IBB converer. The smulaon and expermen resuls of he acve clamp IBB converer are presened n Fg.. Fg. 7 shows he gae drve volages for swch Q, he man swch volage S, he man swch curren I s, he curren

5 Fg.. Smulaon Waveforms of cve lamp IBB onverer. Fg. shows he gae drve volages for he swch Q and clamp swch Q, he man swch volage S, he man swch curren I S, he clamp capacor curren I c, he curren hrough he col of ransformer s secondary sde I T, he dode curren I, and he nducor curren I. The smulaon resuls agree well wh he heorecal waveforms. I. OUSIO new IBB converer opology has been presened. The opology whch merged buck-boos mode wh flyback mode can share he ransformer and swch. o only buck-boos mode curren bu also flyback mode curren added on he one oupu curren of he converer because he opology merged buck-boos mode wh flyback mode. new converer has ousandng advanages over he convenonal dc-dc converers wh respec o hgh effcency, hgh power densy, and componen ulzaon. The operaon prncple of he proposed converer s descrbed and verfed by smulaon and expermen resuls. lso hs paper presens novel crcu and smulaon resul of new acve solaed buck-boos converer. The ncorporaon of he acve clamp crcu no he proposed converer opology provdes a mechansm for achevng ZS for boh he man and auxlary swches. EFEEES [] ober W. Erckson, ragan aksmovc, Fundamenal of Power Elecroncs, Inernaonal Thomson publshng. []. Wason, G.. Hua, F.. ee, haracerzaon of an acve clamp flyback opology for power facor correcon applcaons, Proceedngs of he nh nnual ppled Power Elecroncs onference, PP 4-48,994. [3]. Wason, G.. Hua, F.. ee, haracerzaon of an acve clamp flyback opology for power facor correcon applcaons, Proceedngs of he nh nnual ppled Power Elecroncs onference, PP 4-48,994. [4]. Wason, G.. Hua, F.. ee, haracerzaon of an acve clamp flyback opology for power facor correcon applcaons, Proceedngs of he nh nnual ppled Power Elecroncs onference, PP 4-48,994.