白熾燈泡：
補(bǔ)充:應(yīng)用文檔中對(duì)啟動(dòng)電路的描述、、2.2Start-upcircuitAsalreadymentionedintheintroductionsection,thecontrollerislocatedonthesecondarysideofthepowertransformer,andforthisreason,astart-upcircuithastobeprovidedforacorrectsystemactivation.Thestart-upcircuitisbasedonadiacsendingatrainofcontrolledpulsestothelowsidedrivesection;thefloatingdrivesectionisenergisedbythesecondsecondarygatedrivetransformerwinding.AssoonastheL5991awakes-up,itgeneratesapwmsignalenablingthestart-upcircuit.大概翻譯為:前面已經(jīng)介紹控制器放在二次側(cè),因此啟動(dòng)電路就必須提供合適的方法令I(lǐng)C工作,本設(shè)計(jì)基于采用二端交流開關(guān)送出一觸發(fā)脈沖給低邊驅(qū)動(dòng)部分,高變MOS再由二次側(cè)供電,L5991即刻喚醒,即產(chǎn)生PWM信號(hào)從而完成啟動(dòng).此說明中的二端交流開關(guān)是怎么一回事?這個(gè)啟動(dòng)的描述,我沒弄懂、、誰(shuí)知道的幫忙結(jié)合原理圖解釋一下啊