IC693CHS391RR
使用預(yù)設(shè)的VR1執(zhí)行過(guò)壓設(shè)置,以便當(dāng)電壓超過(guò)上限(例如,260V)時(shí)T1導(dǎo)通。當(dāng)T1導(dǎo)通時(shí),它關(guān)閉T2。晶體管T2用作欠壓保護(hù)器。欠壓設(shè)置是在預(yù)設(shè)VR2的支持下進(jìn)行的,這樣當(dāng)電壓低于下限(例如,180V)時(shí),T2停止導(dǎo)通。齊納二極管ZD1和ZD2分別向晶體管T1和T2提供基極偏置。晶體管T3和T4背靠背連接以形成SCR配置,其行為類似于“開(kāi)”/“關(guān)”控制。開(kāi)關(guān)S1用于打開(kāi)泵,而開(kāi)關(guān)S2用于關(guān)閉泵。
在產(chǎn)生過(guò)壓/欠壓設(shè)置時(shí),暫時(shí)斷開(kāi)C2。電容器C2可防止由于電壓快速波動(dòng)而導(dǎo)致的繼電器抖動(dòng)。
穩(wěn)壓器IC7809經(jīng)電容器C4濾波后,連同繼電器一起為軟開(kāi)關(guān)提供9V穩(wěn)壓電源。適當(dāng)?shù)奈⑿蛿嗦菲饔糜谧詣?dòng)過(guò)電流保護(hù)。綠色LED(LED1)表示電機(jī)“開(kāi)啟”,紅色LED(LED2)表示電源“開(kāi)啟”。電機(jī)連接到繼電器的常開(kāi)觸點(diǎn)。當(dāng)繼電器通電時(shí),電機(jī)啟動(dòng)。
IC693CHS391RR
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