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開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)K以一(yi)定的(de)(de)(de)時(shi)間(jian)間(jian)隔重復地接(jie)通(tong)(tong)和斷(duan)(duan)開(kai)(kai)(kai)(kai)，在(zai)(zai)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)K接(jie)通(tong)(tong)時(shi)，輸入電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)E通(tong)(tong)過(guo)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)K和濾波電(dian)(dian)(dian)(dian)(dian)路提(ti)(ti)供給負(fu)載(zai)(zai)RL，在(zai)(zai)整個(ge)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)接(jie)通(tong)(tong)期間(jian)，電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)E向負(fu)載(zai)(zai)提(ti)(ti)供能(neng)(neng)量(liang);當開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)K斷(duan)(duan)開(kai)(kai)(kai)(kai)時(shi)，輸入電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)E便中(zhong)斷(duan)(duan)了能(neng)(neng)量(liang)的(de)(de)(de)提(ti)(ti)供。可(ke)(ke)見，輸入電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)向負(fu)載(zai)(zai)提(ti)(ti)供能(neng)(neng)量(liang)是斷(duan)(duan)續(xu)的(de)(de)(de)，為使(shi)負(fu)載(zai)(zai)能(neng)(neng)得(de)(de)到(dao)連續(xu)的(de)(de)(de)能(neng)(neng)量(liang)提(ti)(ti)供，開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)穩(wen)壓(ya)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)必須(xu)要(yao)有一(yi)套儲能(neng)(neng)裝置，在(zai)(zai)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)接(jie)通(tong)(tong)時(shi)將(jiang)一(yi)部份能(neng)(neng)量(liang)儲存起來(lai)，在(zai)(zai)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)斷(duan)(duan)開(kai)(kai)(kai)(kai)時(shi)，向負(fu)載(zai)(zai)釋(shi)放。由電(dian)(dian)(dian)(dian)(dian)感L、電(dian)(dian)(dian)(dian)(dian)容C2和二(er)(er)極管(guan)D組成的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)路，就具有這(zhe)種功能(neng)(neng)。電(dian)(dian)(dian)(dian)(dian)感L用以儲存能(neng)(neng)量(liang)，在(zai)(zai)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)斷(duan)(duan)開(kai)(kai)(kai)(kai)時(shi)，儲存在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)感L中(zhong)的(de)(de)(de)能(neng)(neng)量(liang)通(tong)(tong)過(guo)二(er)(er)極管(guan)D釋(shi)放給負(fu)載(zai)(zai)，使(shi)負(fu)載(zai)(zai)得(de)(de)到(dao)連續(xu)而穩(wen)定的(de)(de)(de)能(neng)(neng)量(liang)，因二(er)(er)極管(guan)D使(shi)負(fu)載(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流連續(xu)不斷(duan)(duan)，所(suo)以稱為續(xu)流二(er)(er)極管(guan)。在(zai)(zai)AB間(jian)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)平均值EAB可(ke)(ke)用下式(shi)表示:
EAB=TON/T*E
式中TON為開(kai)關(guan)(guan)每次(ci)接(jie)通(tong)(tong)的(de)(de)時(shi)間(jian)，T為開(kai)關(guan)(guan)通(tong)(tong)斷的(de)(de)工作周期(qi)(即開(kai)關(guan)(guan)接(jie)通(tong)(tong)時(shi)間(jian)TON和(he)關(guan)(guan)斷時(shi)間(jian)TOFF之和(he))。
由式可知(zhi)，改變(bian)(bian)開關(guan)接(jie)(jie)通時間(jian)和(he)(he)工作(zuo)周(zhou)(zhou)期的比(bi)(bi)例，AB間(jian)電(dian)壓(ya)的平均值也隨之改變(bian)(bian)，因此(ci)，隨著負載及(ji)輸入電(dian)源電(dian)壓(ya)的變(bian)(bian)化自動調整TON和(he)(he)T的比(bi)(bi)例便能使輸出電(dian)壓(ya)V0維持(chi)不變(bian)(bian)。改變(bian)(bian)接(jie)(jie)通時間(jian)TON和(he)(he)工作(zuo)周(zhou)(zhou)期比(bi)(bi)例亦即改變(bian)(bian)脈沖的占空比(bi)(bi)，這種(zhong)方法(fa)稱(cheng)為"時間(jian)比(bi)(bi)率控制(zhi)"(Time Ratio Control,縮寫為TRC)。
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