看看這個(gè)有源箝位電路圖,如何把效率提高到85%以上,本電源有一定難度
這是幾個(gè)月前沒有搞定的一個(gè)項(xiàng)目,現(xiàn)在又要開始做了.技術(shù)參數(shù)如下
輸入直流11-16伏,輸出dc20v,16v,15v可以調(diào)節(jié),功率100瓦,
電源尺寸12.5mm*55mm*35mm
效率大于85%,頻率300k,原副邊隔離
各位,我自己功底有限,以前開始做時(shí)便用了有源箝位,使用2:8的變壓器升壓,但正是這一原因?qū)е滦实紫?請各位就本圖或合理的方案提提看法,致謝!1065602999.doc
看看這個(gè)有源箝位電路圖,如何把效率提高到85%以上,本電源有一定難度
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Topology
I thought you don\'t need to used active clamper circuit, because if you used self driver circuit, the improvement is poor. I had designed 2 90W adapter, one is used isolated flyback converter, input 9V~16V dc, output is selectable from 15V to 20Vdc, the minimum efficiency is 80%@11V dc, another is used SEPIC converter, input is 9V~28V dc, dual outputs, one is selectable from 5Vdc to 24Vdc @ 4.75A maximum, one is 3V~9V @ 1A maximum, the minimum effciency is higher than 88% under 9V dc in, 19Vdc out @90W load. So you can try SEPIC circuit, it is simply and easy to acheive ZVS function by use a aux. mosfet.
I thought you don\'t need to used active clamper circuit, because if you used self driver circuit, the improvement is poor. I had designed 2 90W adapter, one is used isolated flyback converter, input 9V~16V dc, output is selectable from 15V to 20Vdc, the minimum efficiency is 80%@11V dc, another is used SEPIC converter, input is 9V~28V dc, dual outputs, one is selectable from 5Vdc to 24Vdc @ 4.75A maximum, one is 3V~9V @ 1A maximum, the minimum effciency is higher than 88% under 9V dc in, 19Vdc out @90W load. So you can try SEPIC circuit, it is simply and easy to acheive ZVS function by use a aux. mosfet.
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@arthur.deng
TopologyIthoughtyoudon\'tneedtousedactiveclampercircuit,becauseifyouusedselfdrivercircuit,theimprovementispoor.Ihaddesigned290Wadapter,oneisusedisolatedflybackconverter,input9V~16Vdc,outputisselectablefrom15Vto20Vdc,theminimumefficiencyis80%@11Vdc,anotherisusedSEPICconverter,inputis9V~28Vdc,dualoutputs,oneisselectablefrom5Vdcto24Vdc@4.75Amaximum,oneis3V~9V@1Amaximum,theminimumeffciencyishigherthan88%under9Vdcin,19Vdcout@90Wload.SoyoucantrySEPICcircuit,itissimplyandeasytoacheiveZVSfunctionbyuseaaux.mosfet.
非常感謝您的關(guān)注和建設(shè)性方案,我的電路要求原副邊隔離,sepic電路沒有接觸過,我會(huì)去進(jìn)行了解和
學(xué)習(xí)的,對于反激方案,主要可以少一個(gè)大電感,有助減小體積,您的功率為290瓦,應(yīng)是90瓦吧?估計(jì)您用的是同步整流法,要不效率不大可能達(dá)到80%.
sepic方案不知道您用的什么整流方式,提個(gè)非常過份的要求,您能把大體的原理圖發(fā)給我嗎?
我的email:chenqq2000@sohu.com
學(xué)習(xí)的,對于反激方案,主要可以少一個(gè)大電感,有助減小體積,您的功率為290瓦,應(yīng)是90瓦吧?估計(jì)您用的是同步整流法,要不效率不大可能達(dá)到80%.
sepic方案不知道您用的什么整流方式,提個(gè)非常過份的要求,您能把大體的原理圖發(fā)給我嗎?
我的email:chenqq2000@sohu.com
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tu
各位,如何才能實(shí)現(xiàn)下敘時(shí)序控制?
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/0/1065842127.gif');}" onmousewheel="return imgzoom(this);">
各位,如何才能實(shí)現(xiàn)下敘時(shí)序控制?
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/0/1065842127.gif');}" onmousewheel="return imgzoom(this);"> 0
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@chenqq2000
非常感謝您的關(guān)注和建設(shè)性方案,我的電路要求原副邊隔離,sepic電路沒有接觸過,我會(huì)去進(jìn)行了解和學(xué)習(xí)的,對于反激方案,主要可以少一個(gè)大電感,有助減小體積,您的功率為290瓦,應(yīng)是90瓦吧?估計(jì)您用的是同步整流法,要不效率不大可能達(dá)到80%. sepic方案不知道您用的什么整流方式,提個(gè)非常過份的要求,您能把大體的原理圖發(fā)給我嗎?我的email:chenqq2000@sohu.com
For your question
My means that I design two 90W adapter. Used flyback, I didn\\\\\\\'t use SR, just by diode, and also is islated between primary and secondary.For the SEPIC circuit, you can get it in TI web-site. I only can provide you some tips and some experience, because there have been patented limit by our company, and I suggest you use current mode controller ex uc3843, because it is easy to design the control loop and current limit or short protection. If you have any question you can feel free to contact me. 1065780688.pdf
My means that I design two 90W adapter. Used flyback, I didn\\\\\\\'t use SR, just by diode, and also is islated between primary and secondary.For the SEPIC circuit, you can get it in TI web-site. I only can provide you some tips and some experience, because there have been patented limit by our company, and I suggest you use current mode controller ex uc3843, because it is easy to design the control loop and current limit or short protection. If you have any question you can feel free to contact me. 1065780688.pdf
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@chenqq2000
回鵝兄:如果效率能夠達(dá)到85%,散熱不是問題,非對稱半橋我認(rèn)為用在這里不太合適,電壓要求可調(diào)節(jié),原邊電流有大,所以我認(rèn)為不太好.sepic結(jié)構(gòu)不知道可以用些什么ic?
controller
SEPIC is easy to control, general control IC all can be available, TL494 and UC384x etc. but TL494, the switching speed is lower, but for your application, should be no any problem.
SEPIC is easy to control, general control IC all can be available, TL494 and UC384x etc. but TL494, the switching speed is lower, but for your application, should be no any problem.
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@arthur.deng
controllerSEPICiseasytocontrol,generalcontrolICallcanbeavailable,TL494andUC384xetc.butTL494,theswitchingspeedislower,butforyourapplication,shouldbenoanyproblem.
authur:
我先用硬開關(guān)做了試驗(yàn),效率只有72%,所以要提高到85%,必須實(shí)現(xiàn)軟開關(guān),若用3843,輔助管的時(shí)序怎么實(shí)現(xiàn),一般把這個(gè)輔助信號設(shè)為Ts/10,如下邊圖所示,但怎樣從3843獲得這樣的輔助驅(qū)動(dòng)波形呢?你能告訴相關(guān)的方法嗎?
我先用硬開關(guān)做了試驗(yàn),效率只有72%,所以要提高到85%,必須實(shí)現(xiàn)軟開關(guān),若用3843,輔助管的時(shí)序怎么實(shí)現(xiàn),一般把這個(gè)輔助信號設(shè)為Ts/10,如下邊圖所示,但怎樣從3843獲得這樣的輔助驅(qū)動(dòng)波形呢?你能告訴相關(guān)的方法嗎?
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@chenqq2000
authur:我先用硬開關(guān)做了試驗(yàn),效率只有72%,所以要提高到85%,必須實(shí)現(xiàn)軟開關(guān),若用3843,輔助管的時(shí)序怎么實(shí)現(xiàn),一般把這個(gè)輔助信號設(shè)為Ts/10,如下邊圖所示,但怎樣從3843獲得這樣的輔助驅(qū)動(dòng)波形呢?你能告訴相關(guān)的方法嗎?
efficiency
As you side, I thought your transformer design should not be optimized, based on my experience, the efficiency can achieve 80% if used general flyback topology, if used SEPIC, the efficiency should be improved to higher, ZVS can used self-driver circuit(just a suggestion, I didn\'t try it), by the way, the size is L*W*H is ?
As you side, I thought your transformer design should not be optimized, based on my experience, the efficiency can achieve 80% if used general flyback topology, if used SEPIC, the efficiency should be improved to higher, ZVS can used self-driver circuit(just a suggestion, I didn\'t try it), by the way, the size is L*W*H is ?
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@arthur.deng
efficiencyAsyouside,Ithoughtyourtransformerdesignshouldnotbeoptimized,basedonmyexperience,theefficiencycanachieve80%ifusedgeneralflybacktopology,ifusedSEPIC,theefficiencyshouldbeimprovedtohigher,ZVScanusedself-drivercircuit(justasuggestion,Ididn\'ttryit),bytheway,thesizeisL*W*His?
是的,尺寸正是這個(gè)L*W*H=12.5*55*35
SEPIC的ZVS自驅(qū)動(dòng)你沒有用過,不知道你做的90WSEPIC如何實(shí)現(xiàn)效率88%的,你做的尺寸能告訴我是多少嗎?
SEPIC的ZVS自驅(qū)動(dòng)你沒有用過,不知道你做的90WSEPIC如何實(shí)現(xiàn)效率88%的,你做的尺寸能告訴我是多少嗎?
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@arthur.deng
efficiencyAsyouside,Ithoughtyourtransformerdesignshouldnotbeoptimized,basedonmyexperience,theefficiencycanachieve80%ifusedgeneralflybacktopology,ifusedSEPIC,theefficiencyshouldbeimprovedtohigher,ZVScanusedself-drivercircuit(justasuggestion,Ididn\'ttryit),bytheway,thesizeisL*W*His?
~{;X84~};
sepic~{5gB72\"2;:CSC#,5%JGR;8v~}mos~{5D9X6OS&A&>MBi73!#~}
sepic~{5gB72\"2;:CSC#,5%JGR;8v~}mos~{5D9X6OS&A&>MBi73!#~}
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