变(bian)(bian)频(pin)电(dian)(dian)(dian)(dian)源(yuan)是(shi)将(jiang)市电(dian)(dian)(dian)(dian)中的(de)(de)沟通(tong)电(dian)(dian)(dian)(dian)通(tong)过AC→DC→AC改换， 输出为(wei)纯洁的(de)(de)正(zheng)弦波(bo)，输出频(pin)率和电(dian)(dian)(dian)(dian)压(ya) 一定范围(wei)内可调。它有别于用于电(dian)(dian)(dian)(dian)机调速用的(de)(de)变(bian)(bian)频(pin)调速控制器，也有别于普通(tong)沟通(tong)稳(wen)压(ya)电(dian)(dian)(dian)(dian)源(yuan)。理想的(de)(de)沟通(tong)电(dian)(dian)(dian)(dian)源(yuan)的(de)(de)特点(dian)是(shi)频(pin)率安(an)稳(wen)、电(dian)(dian)(dian)(dian)压(ya)安(an)稳(wen)、内阻(zu)等(deng)于零、电(dian)(dian)(dian)(dian)压(ya)波(bo)形为(wei)纯正(zheng)弦波(bo)(无失真)。
能(neng)为负载提(ti)供(gong)(gong)稳定(ding)直(zhi)(zhi)流(liu)(liu)(liu)(liu)电(dian)源(yuan)(yuan)的电(dian)子装置。直(zhi)(zhi)流(liu)(liu)(liu)(liu)稳压(ya)(ya)(ya)电(dian)源(yuan)(yuan)的供(gong)(gong)电(dian)电(dian)源(yuan)(yuan)大都是交(jiao)流(liu)(liu)(liu)(liu)电(dian)源(yuan)(yuan)，当(dang)交(jiao)流(liu)(liu)(liu)(liu)供(gong)(gong)电(dian)电(dian)源(yuan)(yuan)的电(dian)压(ya)(ya)(ya)或负载电(dian)阻变化时，稳压(ya)(ya)(ya)器的直(zhi)(zhi)流(liu)(liu)(liu)(liu)输出(chu)电(dian)压(ya)(ya)(ya)都会(hui)保持稳定(ding)。直(zhi)(zhi)流(liu)(liu)(liu)(liu)稳压(ya)(ya)(ya)电(dian)源(yuan)(yuan)随(sui)着电(dian)子设备向(xiang)高精度、高稳定(ding)性和高可靠性的方向(xiang)发展，对电(dian)子设备的供(gong)(gong)电(dian)电(dian)源(yuan)(yuan)提(ti)出(chu)了(le)高的要求。
高压直流电源电路是由多个元(yuan)器件组成的，因(yin)此不能采用简(jian)单的方(fang)法来判断其好坏，一般(ban)可用下列(lie)几(ji)种方(fang)法进(jin)行质量判定。
高压(ya)直流电源电路是由(you)多个元器件组成的，因(yin)此不能(neng)采(cai)用简单的方法(fa)来判断其好坏，一般可用下列几(ji)种方法(fa)进行质量判定。
很多人会认(ren)为(wei)可调变频(pin)电(dian)源与变频(pin)器(qi)是同一款产品，其(qi)实两(liang)者之间相差很大，以下为(wei)两(liang)者的区别
为(wei)(wei)了(le)表征各种电(dian)压(ya)或电(dian)流(liu)波形的好坏，一(yi)般(ban)都是拿电(dian)压(ya)或电(dian)流(liu)的幅值(zhi)(zhi)(zhi)、平均值(zhi)(zhi)(zhi)、有(you)(you)效值(zhi)(zhi)(zhi)、一(yi)次谐波等参(can)量互相进行比(bi)较。在高压(ya)直(zhi)流(liu)电(dian)源之中，电(dian)压(ya)或电(dian)流(liu)的幅值(zhi)(zhi)(zhi)和平均值(zhi)(zhi)(zhi)最直(zhi)观(guan)，因(yin)此，我(wo)们(men)用(yong)电(dian)压(ya)或电(dian)流(liu)的幅值(zhi)(zhi)(zhi)与其平均值(zhi)(zhi)(zhi)之比(bi)，称为(wei)(wei)脉(mai)动(dong)系(xi)数S;也有(you)(you)人用(yong)电(dian)压(ya)或电(dian)流(liu)的有(you)(you)效值(zhi)(zhi)(zhi)与其平均值(zhi)(zhi)(zhi)之比(bi)，称为(wei)(wei)波形系(xi)数K。
开关模式(shi)电(dian)(dian)源又称交换式(shi)电(dian)(dian)源、开关变换器(qi)，是(shi)一(yi)种高(gao)频(pin)化电(dian)(dian)能(neng)转换装(zhuang)置(zhi)，是(shi)电(dian)(dian)源供应器(qi)的一(yi)种。其功能(neng)是(shi)将一(yi)个位准的电(dian)(dian)压(ya)，透(tou)过(guo)不同形(xing)式(shi)的架(jia)构转换为(wei)用户端所需求的电(dian)(dian)压(ya)或电(dian)(dian)流。
电(dian)网提供的(de)(de)交流电(dian)一般(ban)为220V(或380V)。而各类(lei)电(dian)子设备所(suo)需直(zhi)流电(dian)压的(de)(de)幅值各不相同。所(suo)以，常(chang)需要(yao)将近电(dian)网电(dian)压先经过电(dian)源变压器，然后(hou)将变换(huan)后(hou)的(de)(de)副边电(dian)压再去整流、滤(lv)波(bo)和稳压，后(hou)得出(chu)所(suo)需要(yao)的(de)(de)直(zhi)流电(dian)压幅值。
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