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        随着电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)技(ji)术(shu)(shu)和(he)(he)开(kai)(kai)关(guan)(guan)(guan)(guan)行业的(de)(de)飞速(su)发(fa)(fa)展,电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)设(she)备(bei)与人们的(de)(de)工作、生活(huo)的(de)(de)关(guan)(guan)(guan)(guan)系日益密(mi)切,而电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)设(she)备(bei)都(dou)离不(bu)开(kai)(kai)可靠的(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan),进(jin)入(ru)80年代计算机(ji)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)全面实(shi)现了(le)开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)化,率(lv)先完(wan)成计算机(ji)的(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)换代,进(jin)入(ru)90年代开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)相继(ji)进(jin)入(ru)各(ge)种(zhong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)、电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器设(she)备(bei)领(ling)域,程控(kong)交换机(ji)、通讯、电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)检测(ce)设(she)备(bei)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)、控(kong)制设(she)备(bei)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)等都(dou)已广(guang)泛地使用(yong)了(le)开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan),更促进(jin)了(le)开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)技(ji)术(shu)(shu)的(de)(de)迅速(su)发(fa)(fa)展。开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)是(shi)利(li)用(yong)现代电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)技(ji)术(shu)(shu),控(kong)制开(kai)(kai)关(guan)(guan)(guan)(guan)晶(jing)体管开(kai)(kai)通和(he)(he)关(guan)(guan)(guan)(guan)断(duan)的(de)(de)时间比率(lv),维持(chi)稳定输出(chu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压的(de)(de)一(yi)(yi)种(zhong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan),开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)一(yi)(yi)般由脉(mai)冲(chong)宽度调制(PWM)控(kong)制IC和(he)(he)MOSFET构成。开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)和(he)(he)线性电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)相比,二者的(de)(de)成本(ben)(ben)都(dou)随着输出(chu)功率(lv)的(de)(de)增(zeng)加而增(zeng)长(zhang),但二者增(zeng)长(zhang)速(su)率(lv)各(ge)异。线性电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)成本(ben)(ben)在某一(yi)(yi)输出(chu)功率(lv)点(dian)上,反(fan)而高于开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan),这(zhei)一(yi)(yi)成本(ben)(ben)反(fan)转点(dian)。随着电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)技(ji)术(shu)(shu)的(de)(de)发(fa)(fa)展和(he)(he)创(chuang)新,使得开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)技(ji)术(shu)(shu)在不(bu)断(duan)地创(chuang)新,这(zhei)一(yi)(yi)成本(ben)(ben)反(fan)转点(dian)日益向(xiang)低输出(chu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)端移动,这(zhei)为(wei)开(kai)(kai)关(guan)(guan)(guan)(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)提供了(le)广(guang)泛的(de)(de)发(fa)(fa)展空(kong)间。 

        开(kai)(kai)关电源(yuan)高(gao)频(pin)化(hua)是(shi)(shi)其发展(zhan)的方向,高(gao)频(pin)化(hua)使开(kai)(kai)关电源(yuan)小型化(hua),并使开(kai)(kai)关电源(yuan)进(jin)入更(geng)广(guang)泛(fan)的应(ying)(ying)(ying)用领域,特别是(shi)(shi)在高(gao)新(xin)技术(shu)领域的应(ying)(ying)(ying)用,推(tui)动了高(gao)新(xin)技术(shu)产品的小型化(hua)、轻便化(hua)。另外(wai)开(kai)(kai)关电源(yuan)的发展(zhan)与应(ying)(ying)(ying)用在节(jie)约能源(yuan)、节(jie)约资源(yuan)及保护环境方面都具有重(zhong)要(yao)的意(yi)义。 

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