前沿調(diào)制和后沿調(diào)制
有沒(méi)有前沿調(diào)制的PWM芯片?
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@cheyne
什么是前沿調(diào)制和后沿調(diào)制,能否簡(jiǎn)單說(shuō)一下概念?
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/47/1163121448.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/47/1163121457.jpg');}" onmousewheel="return imgzoom(this);">
在PFC+PWM的應(yīng)用中,PFC用前沿調(diào)制,PWM用后沿調(diào)制,中間空的時(shí)間短,對(duì)儲(chǔ)能電容的容量和紋波電流要求會(huì)降低.當(dāng)然如果保持時(shí)間有要求,則不能節(jié)省容量.
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@powerint_cec
[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/47/1163121448.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/47/1163121457.jpg');}"onmousewheel="returnimgzoom(this);">在PFC+PWM的應(yīng)用中,PFC用前沿調(diào)制,PWM用后沿調(diào)制,中間空的時(shí)間短,對(duì)儲(chǔ)能電容的容量和紋波電流要求會(huì)降低.當(dāng)然如果保持時(shí)間有要求,則不能節(jié)省容量.
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