1606-XLE480EP 開關電源
1606-XLE480EP 穩(wěn)壓電源
10A 美國AB品牌 開關穩(wěn)壓電源1606-XLE480EP
供應商:上海爍凱電子科技有限公司
穩(wěn)壓電源工作原理圖
穩(wěn)壓電源工作原理圖
用的控制部分。電源接上負載后,通過采樣電路獲得輸出電壓,將此輸出電壓和基準電壓進行比較。如果輸出電壓小于基準電壓,則將誤差值經過放大電路放大后送入調節(jié)器的輸入端,通過調節(jié)器調節(jié)使輸出電壓增加,直到和基準值相等;如果輸出電壓大于基準電壓,則通過調節(jié)器使輸出減小。
穩(wěn)壓器電路由=l2V電源電路 電壓檢測控制電路 過電壓保護組成,如圖5-51所示l2V電源電路由調壓變壓器T的W4 W5繞組和整流二極管VDl-VD4 濾波電容器Cl C2組成。電壓檢測控制電路由電阻器R-R7 電位器RPl Rm 穩(wěn)壓二極管VS 電容器C3 C4和運算放大器集成電路IC(Nl-N3)組成。過電壓保護電路由IC內部的N3 晶體管V3 電阻器Rl2和繼電器K組成。自動調壓電路由電阻器R8-Rll 晶體管Vl V2 直流電動機M 滑動觸頭和T的Wl-W3繞組組成。將交流穩(wěn)壓器的輸大端與市電相接后,在T的W4 W5繞組上產生了感應電壓。該電壓經VDl-VD4整流及Cl C2濾波后,為IC和Vl V2等提供 士l2V不穩(wěn)定工作電壓。+l2V電壓還有其他作用。經Rl-R3分壓 VS穩(wěn)壓后,分別為Nl-N3的反相輸入端提供基準電壓;為過電壓保護電路申的K和V3提供工作電源;經R4 RP2 R6分壓后,為Nl和N2的正相輸入端提供檢測電壓;經R7 RPl R5分壓后,為N3的正相輸入端提供檢測電壓。
Nl-N3將正相輸大端的檢測電壓與反相輸大端的基準電壓進行比較,用產生的誤差電壓去控制自動調壓電路。
當市電電壓正常時,Nl和N2的輸出端電壓為OV,Vl和V2均處于截止狀態(tài),電動機M不工作。
當市電電壓偏低時,Nl和N2輸出低電平,使V2導通,Vl截止,M逆時針旋轉,通過滑壁臂驅動滑動觸頭移動,與T相應的電壓抽頭接觸 (T的Wl W2繞組共設置了21個電壓抽頭,每一檔的電壓調節(jié)范圍為5V),通過T的W2繞組來提升輸出電壓。當輸出交流電壓升至220V時,V2截止,M停轉。當市電電壓偏高時,Nl和N2均輸出高電平,使Vl導通,V2截止,M順時針旋轉,通過滑臂驅動滑動觸頭移動,與T相應的電壓抽頭接觸,通過T的Wl繞組來降低輸出電壓。當輸出交流電壓降至220V時,Vl截止,M停轉。當市電電壓偏高超過260V時,N3因正相輸入端電壓高于反相輸入端電壓而輸出低電平,使V3截止,,K釋放,其常閉觸頭接通交流電壓的輸出回路。當市電電壓為160-260V時,N3因正相輸入端電壓低于反相輸入端電壓而輸出高電平,使V3導通,K吸合,其常閉觸頭斷開,從而保證負載(用電器)不會因過電壓而損壞。
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