半橋變換器是否必須加RCD吸收網(wǎng)絡(luò)?
半橋變換器,硬開關(guān),50KHz,輸出功率280W,一開始為保險起見,加了RCD吸收,結(jié)果空載時RCD網(wǎng)絡(luò)中的電阻就發(fā)熱,后來取掉RCD網(wǎng)絡(luò),半橋電路依然工作正常,帶載情況也可以,只是波形不是特別理想.半橋高頻變壓器原邊電感18mH,這樣大的感量會不會偏大?一般在多少個毫亨?
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@ytdfwangwei
震蕩頻率80K,工作頻率40K,由于有PFC,DC-DC部分輸入是相對穩(wěn)定的400V,后級因此效率相對高點,基本在94%,我做的3KW用半橋也是總效率90%以上.
ytdfwangwei你好!我的半橋電路現(xiàn)在出現(xiàn)一問題,就是高端柵極驅(qū)動會有振蕩,是在下管剛開通那一刻發(fā)生的,試了一些快速關(guān)斷措施,效果不明顯,不知大俠有何好招?謝謝!我是用的IR2110作驅(qū)動,前端是單片機產(chǎn)生脈沖經(jīng)光隔傳送至IR2110的HIN和LIN的.振蕩隨著輸入電壓的升高而加劇,但還沒導(dǎo)致開關(guān)管誤導(dǎo)通.
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@ytdfwangwei
震蕩頻率80K,工作頻率40K,由于有PFC,DC-DC部分輸入是相對穩(wěn)定的400V,后級因此效率相對高點,基本在94%,我做的3KW用半橋也是總效率90%以上.
半橋電路如PDF文件中圖所示.六個波形分別為空載和帶載70W情況下上管柵源極、下管柵源極、變壓器原邊兩端波形.如何消除兩管交錯時的驅(qū)動振蕩波形和變壓器兩端的振蕩(帶載時)?此振蕩對電路有何不良影響?總覺得這波形不爽. 245591229326521.pdf
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500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/245591229326546.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/245591229326556.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/245591229326564.jpg');}" onmousewheel="return imgzoom(this);">
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@littlecarl
半橋電路如PDF文件中圖所示.六個波形分別為空載和帶載70W情況下上管柵源極、下管柵源極、變壓器原邊兩端波形.如何消除兩管交錯時的驅(qū)動振蕩波形和變壓器兩端的振蕩(帶載時)?此振蕩對電路有何不良影響?總覺得這波形不爽.245591229326521.pdf[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326546.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326556.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326564.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326574.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326580.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/72/245591229326587.jpg');}"onmousewheel="returnimgzoom(this);">
關(guān)注此話題的也可以去“半橋電路振蕩波形如何消除(有圖+波形)!!! (+20)”貼看看
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