做T5 28WX2(220V),輸入61.9W輸出27.4W
但功率因素只有0.988
有3個(gè)怪現(xiàn)象,
1;把電壓調(diào)低PF會(huì)變小調(diào)高PF反會(huì)出現(xiàn)0.99的情況!
2;把手放在830的銅片上感覺(jué)溫度很低,但手與場(chǎng)管接觸點(diǎn)會(huì)急劇升溫一下子就燙手了,后用一根銅線接830銅片,另一頭用手摸,接觸點(diǎn)也會(huì)溫升,我想是電磁輻射太大了吧!幫看看PCB合不合理?
3;溫度高一些的時(shí)候PF有點(diǎn)下降!用的是貼片6561
初始如圖上的參數(shù),
調(diào)整過(guò)1,2腳電容;3腳電阻比值和電容大小;4腳到場(chǎng)管電阻;
升壓電感1.2MH,830-S接0.5R/0.5W,
輸入104+25MH+差模2MH+104到整流 ,整流后104
開(kāi)關(guān)二極管HER207
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/36/1135828292.gif');}" 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/36/1135828675.gif');}" 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/36/1135828699.gif');}" onmousewheel="return imgzoom(this);">