A20B-2900-0811

A20B-2900-0811

變頻器上電初始時期，VT1~VT3等3只晶閘管器件因無觸發(fā)信號送入，處于截止狀態(tài)。R相輸入交流電壓(與S、T相構(gòu)成通路)經(jīng)D1半波整流、R1/R4限流、直流電抗器L為直流回路的儲能電容充電，使主電路的P、N端子間的直流電壓逐漸上升至值時，開關(guān)電源電路起振工作，主板MCU器件檢測到直流回路的電壓值上升至某一閾值后，從DJP1的23端子輸出低電平的“晶閘管開通信號”，光耦合器DPH7由此產(chǎn)生輸入側(cè)電流，輸出側(cè)內(nèi)部光敏晶體管導通，將振蕩器DU2由3腳輸出的脈沖信號輸入晶體管DQ14的基極，經(jīng)復合放大器DQ14、DQ15進行功率放大，由二極管DD16、DD30、DD31將觸發(fā)脈沖信號分為3路，輸入至晶閘管VT1~VT3等3只晶閘管的柵陰結(jié)，使VT1~VT3等3只晶閘管同時開通，由3只晶閘管和3只整流二極管構(gòu)成的半控橋電路“變身為”3相橋式整流電路。

脈沖形成電路的供電電源由開關(guān)電源電路(開關(guān)變壓器DT1的一個繞組)提供，整流電源的負端接主電路P端(3只晶閘管的陰極)，振蕩電路輸出的正向脈沖，經(jīng)功率放大電路輸入晶閘管的柵極，形成觸發(fā)電流的通路。觸發(fā)脈沖形成電路由DU2、DQ14、DQ15等元件組成。時基電路1455B(同NE555)與外圍DR64、DR45、DD27/DD28、DC42等定時元件構(gòu)成多諧振蕩電路，脈沖信號由3腳輸出，脈沖信號向后級電路的傳輸與否受耦合器DPH7(MCU主板信號)的控制。變頻器上電及主電路儲能電容充電結(jié)束后，DU2輸出脈沖信號一直在傳輸中，與常規(guī)晶閘管調(diào)壓電路中的觸發(fā)信號不同，信號不必與電網(wǎng)同步和具備確定的相位關(guān)系，這是一個振蕩頻率約為5kHz的“高頻觸發(fā)信號”，呈隨機性地加到晶閘管的柵陰結(jié)上，總是使用3只晶閘管在電網(wǎng)電壓過零點位置“盡早”開通。

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