昨日在電源網(wǎng)發(fā)了個(gè)貼子求助,現(xiàn)在效率可以做到80%了,但是波形不好,現(xiàn)我把測(cè)試時(shí)的波形發(fā)上來(lái),請(qǐng)大家再來(lái)幫忙看看如何解決.
http://bbs.dianyuan.com/topic/259301
推挽式電源請(qǐng)教
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空載時(shí)MOS管控制極波形
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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/70/2901511224233568.jpg');}" onmousewheel="return imgzoom(this);"> 0
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@不甘心
空載時(shí)MOS管控制極波形[圖片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/70/2901511224233568.jpg');}"onmousewheel="returnimgzoom(this);">
滿載時(shí)MOS管控制極波形
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/70/2901511224233638.jpg');}" onmousewheel="return imgzoom(this);">
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/70/2901511224233665.jpg');}" onmousewheel="return imgzoom(this);">
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/70/2901511224233638.jpg');}" onmousewheel="return imgzoom(this);">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/70/2901511224233665.jpg');}" onmousewheel="return imgzoom(this);"> 0
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@不甘心
滿載時(shí)MOS管控制極波形[圖片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/70/2901511224233638.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/70/2901511224233665.jpg');}"onmousewheel="returnimgzoom(this);">
滿載時(shí)次級(jí)整流二極管波形
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/70/2901511224233887.jpg');}" onmousewheel="return imgzoom(this);">
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/70/2901511224233887.jpg');}" onmousewheel="return imgzoom(this);"> 0
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@不甘心
滿載時(shí)次級(jí)整流二極管波形[圖片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/70/2901511224233887.jpg');}"onmousewheel="returnimgzoom(this);">
怎么就沒(méi)人幫忙一下呢?
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@pads2005pcb
車載逆變電源,變壓器,推挽輸入12V,輸出300V1A 開關(guān)頻率40KHZ,效率不低于0.8占空比我不知道取多少,請(qǐng)你作決定,由于是急著開發(fā)的市場(chǎng)機(jī),請(qǐng)大俠仔細(xì)幫我算好,萬(wàn)分感謝.如果能提供你的公式則更佳.
300W push-pull? except you use UC3846 current mode chips,if you use TL494/SG3525 you will be trapped at magnet bias, which often does not show up in experiments but blow up transistors several months after sold.
Recommend to build hard switched half-bridge topology and use UC3825/A as the main controller and IR2110 as the gate driver, with MOSFET 90N02, 90N03 or even 70N02 is enough.
set the UC3825 clock freq to 600Khz and so the PC40/PC44 transformer runs at its best matched freq 300Khz. A small FeAlSi toroid is recommended as the output inductor.
The transformer is very easy to build, EI28 core with only 2 windings--- PRI 1 : SEC 58( 5.5V -> (302/0.95=319V), assume maximum transistor and Cap ESR voltage down is 0.5V, in fact smaller as 0.3V or such)
maximum Duty to as large as possible in your experiment, My value is 95% largest.
Recommend to build hard switched half-bridge topology and use UC3825/A as the main controller and IR2110 as the gate driver, with MOSFET 90N02, 90N03 or even 70N02 is enough.
set the UC3825 clock freq to 600Khz and so the PC40/PC44 transformer runs at its best matched freq 300Khz. A small FeAlSi toroid is recommended as the output inductor.
The transformer is very easy to build, EI28 core with only 2 windings--- PRI 1 : SEC 58( 5.5V -> (302/0.95=319V), assume maximum transistor and Cap ESR voltage down is 0.5V, in fact smaller as 0.3V or such)
maximum Duty to as large as possible in your experiment, My value is 95% largest.
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@pads2005pcb
車載逆變電源,變壓器,推挽輸入12V,輸出300V1A 開關(guān)頻率40KHZ,效率不低于0.8占空比我不知道取多少,請(qǐng)你作決定,由于是急著開發(fā)的市場(chǎng)機(jī),請(qǐng)大俠仔細(xì)幫我算好,萬(wàn)分感謝.如果能提供你的公式則更佳.
2901511224636919.doc
pads2005pcb你好!這是我所幫你算的推挽式開關(guān)變壓器,供你參考,如果能用的話我再告訴你是如何計(jì)算的.我也是頭一回做,權(quán)當(dāng)是拋磚引玉吧!
初級(jí)請(qǐng)用銅帶繞,開關(guān)管選用IRF3205就行了,輸出為橋式整流.如有不妥,也請(qǐng)各位高手指正!
謝謝!
pads2005pcb你好!這是我所幫你算的推挽式開關(guān)變壓器,供你參考,如果能用的話我再告訴你是如何計(jì)算的.我也是頭一回做,權(quán)當(dāng)是拋磚引玉吧!
初級(jí)請(qǐng)用銅帶繞,開關(guān)管選用IRF3205就行了,輸出為橋式整流.如有不妥,也請(qǐng)各位高手指正!
謝謝!
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