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<h1>抑制偏磁的簡單電路拓?fù)浼捌涔ぷ髟?/h1> <div id="dzfeldv" class="authorTimeSource"> <span>作者：</span> <span>時間：2011-05-29</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="zcqwvyx" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="jxlcesg" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' 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border=0><BR>如圖2所示，在PWM全橋逆變電源輸出端，采用通過霍爾電壓傳感器(HL)隔離的差動高阻積分電路，通過此電路可直接地實時檢測橋端輸出電壓脈沖列uAB的直流分量，圖2中積分環(huán)節(jié)輸出電壓um波形如圖3中所示，為標(biāo)準(zhǔn)的三角波（暫不考慮死區(qū)）。其上升時間即為ugs1的脈寬（亦即S1及S2的開通時間），并且以固定的du/dt上升。其下降時間為ugs2的脈寬（即S3及S3的開通時間）?？刂齐娐费a(bǔ)償過程如下：以ugs1為參考脈沖方波(固定的脈寬及占空比D，且50％>D>40％)，控制S1及S2的通斷；而以ugs2為可調(diào)脈沖方波去控制S3及S4。在一個基波周期內(nèi)，C1充電時間和充電速度固定，其充電量亦確定，此充電量確定了放電過程的時間，亦即ugs2的占空比。由此可見，S3及S4的開通時間由S1及S2的開通時間決定，其結(jié)果是消除了高頻變壓器中的直流分量。假設(shè)某種原因?qū)е聈gs1的D變大，則S1及S2管的導(dǎo)通時間變長，C1中充電量增大，其放電時間相應(yīng)變長，從而使ugs2的占空比增大，S3及S4的開通時間也增大，從而達(dá)到了消除直流分量的目的。反之亦然。<BR> 在設(shè)計中需要注意以下事項。<BR> 1）霍爾電壓傳感器<BR> （1）對于電壓測量，原邊電流與被測電壓之比一定要通過一個外部電阻Ri來確定，并串聯(lián)在傳感器原邊電路，為使傳感器達(dá)到最佳精度，應(yīng)盡量精確選擇Ri的大小，使輸入電流為10mA為佳。<BR> （2）考慮到初級線圈內(nèi)阻(與Ri相比，為保持溫差盡可能低)和隔離，此傳感器適用于測量10～500V電壓。Ri的功率為所測試電壓乘以0.01后的4倍以上，以確保測量電阻的穩(wěn)定性。<BR> 2）控制電路部分<BR> （1）積分電容器C1應(yīng)選用泄漏電阻大的電容器來減少積分誤差。C2應(yīng)滿足可以濾除基波及基波以上的交流分量。<P><FONT face=Verdana><FONT face=Verdana>（2）在應(yīng)用中應(yīng)該注意，比較電平是不可能為零的（由于器件性能的影響，三角波不可能降為零），為了使比較器可靠性高，應(yīng)使比較電平略大于三角波的最小值。由于上述原因，造成的脈寬ugs1比ugs2的稍窄，可通過調(diào)節(jié)彼此的死區(qū)時間來給予一定程度的補(bǔ)償。<BR> （3）ugs2的死區(qū)時間通過R6、R7、C3及一對二極管組成充放電回路和比較<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/放大器"><em>放大器</em></a>產(chǎn)生，ugs1的死區(qū)時間通過R10、R11、C4及一對二極管組成充放電回路和比較<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/放大器"><em>放大器</em></a>產(chǎn)生。通過適當(dāng)調(diào)節(jié)比較<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/放大器"><em>放大器</em></a>的比較電平補(bǔ)償ugs2損失的部分占空比。<BR>如圖2所示，在PWM全橋逆變電源輸出端，采用通過霍爾電壓傳感器(HL)隔離的差動高阻積分電路，通過此電路可直接地實時檢測橋端輸出電壓脈沖列uAB的直流分量，圖2中積分環(huán)節(jié)輸出電壓um波形如圖3中所示，為標(biāo)準(zhǔn)的三角波（暫不考慮死區(qū)）。其上升時間即為ugs1的脈寬（亦即S1及S2的開通時間），并且以固定的du/dt上升。其下降時間為ugs2的脈寬（即S3及S3的開通時間）?？刂齐娐费a(bǔ)償過程如下：以ugs1為參考脈沖方波(固定的脈寬及占空比D，且50％>D>40％)，控制S1及S2的通斷；而以ugs2為可調(diào)脈沖方波去控制S3及S4。在一個基波周期內(nèi)，C1充電時間和充電速度固定，其充電量亦確定，此充電量確定了放電過程的時間，亦即ugs2的占空比。由此可見，S3及S4的開通時間由S1及S2的開通時間決定，其結(jié)果是消除了高頻變壓器中的直流分量。假設(shè)某種原因?qū)е聈gs1的D變大，則S1及S2管的導(dǎo)通時間變長，C1中充電量增大，其放電時間相應(yīng)變長，從而使ugs2的占空比增大，S3及S4的開通時間也增大，從而達(dá)到了消除直流分量的目的。反之亦然。<BR> 在設(shè)計中需要注意以下事項。<BR> 1）霍爾電壓傳感器<BR> （1）對于電壓測量，原邊電流與被測電壓之比一定要通過一個外部電阻Ri來確定，并串聯(lián)在傳感器原邊電路，為使傳感器達(dá)到最佳精度，應(yīng)盡量精確選擇Ri的大小，使輸入電流為10mA為佳。<BR> （2）考慮到初級線圈內(nèi)阻(與Ri相比，為保持溫差盡可能低)和隔離，此傳感器適用于測量10～500V電壓。Ri的功率為所測試電壓乘以0.01后的4倍以上，以確保測量電阻的穩(wěn)定性。<BR> 2）控制電路部分<BR> （1）積分電容器C1應(yīng)選用泄漏電阻大的電容器來減少積分誤差。C2應(yīng)滿足可以濾除基波及基波以上的交流分量。</P><P><FONT face=Verdana><FONT face=Verdana>（2）在應(yīng)用中應(yīng)該注意，比較電平是不可能為零的（由于器件性能的影響，三角波不可能降為零），為了使比較器可靠性高，應(yīng)使比較電平略大于三角波的最小值。由于上述原因，造成的脈寬ugs1比ugs2的稍窄，可通過調(diào)節(jié)彼此的死區(qū)時間來給予一定程度的補(bǔ)償。<BR> （3）ugs2的死區(qū)時間通過R6、R7、C3及一對二極管組成充放電回路和比較放大器產(chǎn)生，ugs1的死區(qū)時間通過R10、R11、C4及一對二極管組成充放電回路和比較放大器產(chǎn)生。通過適當(dāng)調(diào)節(jié)比較放大器的比較電平補(bǔ)償ugs2損失的部分占空比。<FONT face=Verdana><FONT face=Verdana></P></FONT></FONT></FONT></FONT></FONT></FONT> </span>  <div class="ovmovux" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="thcizcu" class="hAd8"> <br></span>   </div> </article> <div id="hrmhgig" class="clear"></div> <br/> <div id="makxhrj" 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