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class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/8/7/14/637007841917220582_pinzongguangdian_9155349.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="1jlictl" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/8/7/14/637007841917220582_pinzongguangdian_9155349.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="kume7uw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>徐州放大器推薦廠家,放大器</p><p><span>***更新：</span>2020-07-05 18:12:02</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="fjwtd7c" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">蘇州品縱光電有限公司</a></p><p><span>聯(lián)系人：</span>杜靖</p><p><span>郵箱: </span>sales@jibled.com</p><p><span>電話: </span>18100681679</p><p><span>傳真: </span>0512_33017681</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>0512-33017680</p><p><span>地址: </span>江蘇省蘇州太倉(cāng)市瀏河鎮(zhèn)新塘新誼西路1688號(hào)2樓</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="raip8ln" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="kjbdc3s" class="box"><p><p style="text-indent:25px">功率放大器原理利用三極管的電流控制作用或場(chǎng)效應(yīng)管的電壓控制作用將電源的功率轉(zhuǎn)換為按照輸入信號(hào)變化的電流，徐州放大器推薦廠家。因?yàn)槁曇羰遣煌穹筒煌l率的波，即交流信號(hào)電流，三極管的集電極電流永遠(yuǎn)是基極電流的β倍，β是三極管的交流放大倍數(shù)，應(yīng)用這一點(diǎn)，若將小信號(hào)注入基極，則集電極流過(guò)的電流會(huì)等于基極電流的β倍，然后將這個(gè)信號(hào)用隔直電容隔離出來(lái)，徐州放大器推薦廠家，徐州放大器推薦廠家，就得到了電流（或電壓）是原先的β倍的大信號(hào)，這現(xiàn)象成為三極管的放大作用。經(jīng)過(guò)不斷的電流放大，就完成了功率放大。徐州放大器推薦廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州放大器推薦廠家,放大器" src="http://tyunfile.71360.com/UpLoadFile/2019/8/7/14/637007841917220582_pinzongguangdian_9155349.jpg"></div><p style="text-indent:25px">功率放大器通常由3部分組成：前置放大器、驅(qū)動(dòng)放大器、末級(jí)功率放大器。 1、前置放大器起匹配作用，其輸入阻抗高（不小于10kΩ），可以將前面的信號(hào)大部分吸收過(guò)去，輸出阻抗低（幾十Ω以下），可以將信號(hào)大部風(fēng)傳送出去。同時(shí)，它本身又是一種電流放大器，將輸入的電壓信號(hào)轉(zhuǎn)化成電流信號(hào)，并給予適當(dāng)?shù)姆糯蟆?2、驅(qū)動(dòng)放大器起橋梁作用，它將前置放大器送來(lái)的電流信號(hào)作進(jìn)一步放大，將其放大成中等功率的信號(hào)驅(qū)動(dòng)末級(jí)功率放大器正常工作。如果沒(méi)有驅(qū)動(dòng)放大器，末級(jí)功率放大器不可能送出大功率的聲音信號(hào)。 3、末級(jí)功率放大器起關(guān)鍵作用。它將驅(qū)動(dòng)放大器送來(lái)的電流信號(hào)形成大功率信號(hào)，帶動(dòng)揚(yáng)聲器發(fā)聲，它的技術(shù)指標(biāo)決定了整個(gè)功率放大器的技術(shù)指標(biāo)。徐州放大器推薦廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州放大器推薦廠家,放大器" src="http://tyunfile.71360.com/UpLoadFile/2019/8/7/14/637007841916596150_pinzongguangdian_5417733.jpg"></div><p style="text-indent:25px">功放所用的有源器件主要是晶體管(雙極型或場(chǎng)效應(yīng)晶體管），在工作頻率很高或要求輸出功率很大等場(chǎng)合,也使用電子管(包括大功率發(fā)射電子管）；在微波段使用行波管。功放按其有源器件的工作點(diǎn)不同可分為甲（A)類、甲乙（AB)類、乙（B)類、丙(C)類和?。―)類等。表內(nèi)列出不同工作類型的功率放大器對(duì)正弦波所能達(dá)到的**高效率。功放常應(yīng)用于廣播、通信發(fā)射機(jī)的輸出級(jí)、音響系統(tǒng)的輸出級(jí)以及控制系統(tǒng)驅(qū)動(dòng)執(zhí)行機(jī)構(gòu)的放大器等。應(yīng)用場(chǎng)合不同,性能要求不同，電路的構(gòu)成與工作類型也不同。常用的有線性功放、諧振功放、寬帶功放電路等。為提高輸出功率，可采用功率合成技術(shù)。</p><p style="text-indent:25px">功率放大器的基本組成功率放大器通常由3部分組成：前置放大器、驅(qū)動(dòng)放大器、末級(jí)功率放大器。 1、前置放大器起匹配作用，其輸入阻抗高（不小于10kΩ），可以將前面的信號(hào)大部分吸收過(guò)去，輸出阻抗低（幾十Ω以下），可以將信號(hào)大部風(fēng)傳送出去，同時(shí)，它本身又是一種電流放大器，將輸入的電壓信號(hào)轉(zhuǎn)化成電流信號(hào)，并給予適當(dāng)?shù)姆糯螅?2、驅(qū)動(dòng)放大器起橋梁作用，它將前置放大器送來(lái)的電流信號(hào)作進(jìn)一步放大，將其放大成中等功率的信號(hào)驅(qū)動(dòng)末級(jí)功率放大器正常工作，如果沒(méi)有驅(qū)動(dòng)放大器，末級(jí)功率放大器不可能送出大功率的聲音信號(hào)； 3、末級(jí)功率放大器起關(guān)鍵作用，它將驅(qū)動(dòng)放大器送來(lái)的電流信號(hào)形成大功率信號(hào)，帶動(dòng)揚(yáng)聲器發(fā)聲，它的技術(shù)指標(biāo)決定了整個(gè)功率放大器的技術(shù)指標(biāo)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州放大器推薦廠家,放大器" src="http://tyunfile.71360.com/UpLoadFile/2019/8/7/14/637007841917220582_pinzongguangdian_9196539.jpg"></div><p style="text-indent:25px">功率放大器（英文名稱：power amplifier），簡(jiǎn)稱“功放”，是指在給定失真率條件下，能產(chǎn)生**大功率輸出以驅(qū)動(dòng)某一負(fù)載（例如揚(yáng)聲器）的放大器。功率放大器在整個(gè)音響系統(tǒng)中起到了“組織、協(xié)調(diào)”的樞紐作用，在某種程度上主宰著整個(gè)系統(tǒng)能否提供良好的音質(zhì)輸出。功率放大器工作原理利用三極管的電流控制作用或場(chǎng)效應(yīng)管的電壓控制作用將電源的功率轉(zhuǎn)換為按照輸入信號(hào)變化的電流。因?yàn)槁曇羰遣煌穹筒煌l率的波，即交流信號(hào)電流，三極管的集電極電流永遠(yuǎn)是基極電流的β倍，β是三極管的交流放大倍數(shù)，應(yīng)用這一點(diǎn)，若將小信號(hào)注入基極，則集電極流過(guò)的電流會(huì)等于基極電流的β倍，然后將這個(gè)信號(hào)用隔直電容隔離出來(lái)，就得到了電流（或電壓）是原先的β倍的大信號(hào)，這現(xiàn)象成為三極管的放大作用。經(jīng)過(guò)不斷的電流放大，就完成了功率放大。泰州放大器哪家好</p><p style="text-indent:25px">徐州放大器推薦廠家</p><p style="text-indent:25px">功率放大器注意事項(xiàng) 對(duì)于主要作用是向負(fù)載提供功率的放大電路通常稱為功率放大電路，其主要特點(diǎn)如下： 1、輸出功率是指交變電壓和交變電流的乘積，即交流功率； 2、交流功率是在輸入為正弦波、輸出波形基本不失真時(shí)定義的； 3、輸出功率大，因而消耗在電路內(nèi)的能量和電源提供的能量也大； 4、晶體管常常工作在極限應(yīng)用狀態(tài)，由此要考慮必要的散熱措施和過(guò)電流、過(guò)電壓的保護(hù)措施。徐州放大器推薦廠家</p><p style="text-indent:25px">蘇州品縱光電有限公司坐落江蘇省蘇州太倉(cāng)市瀏河鎮(zhèn)新塘新誼西路1688號(hào)2樓，交通便利，環(huán)境優(yōu)美，是一家其他型企業(yè)。公司是一家有限責(zé)任公司企業(yè)，以誠(chéng)信務(wù)實(shí)的創(chuàng)業(yè)精神、質(zhì)量高效的管理團(tuán)隊(duì)、精悍的職工隊(duì)伍，努力為廣大用戶提供***的產(chǎn)品。公司業(yè)務(wù)涵蓋[ "LED調(diào)光電源", "LED調(diào)光驅(qū)動(dòng)", "LED控制器" ]，價(jià)格合理，品質(zhì)有保證，深受廣大客戶的歡迎。蘇州品縱將以真誠(chéng)的服務(wù)、創(chuàng)新的理念、***的產(chǎn)品，為彼此贏得全新的未來(lái)！</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/505313.html</p></div></div></div></div></div><div id="e7phu88" class="page-right twoColRt"><div id="o3y3vx3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="jyvifwt" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 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