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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