白熾燈泡：
補充:應用文檔中對啟動電路的描述、、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),因此啟動電路就必須提供合適的方法令IC工作,本設計基于采用二端交流開關送出一觸發(fā)脈沖給低邊驅(qū)動部分,高變MOS再由二次側(cè)供電,L5991即刻喚醒,即產(chǎn)生PWM信號從而完成啟動.此說明中的二端交流開關是怎么一回事?這個啟動的描述,我沒弄懂、、誰知道的幫忙結合原理圖解釋一下啊