如干电池、蓄电池、直(zhi)流发电机等。直(zhi)流电源,是维持电路(lu)中(zhong)形(xing)成稳恒电压电流的装置。
变频器进线电(dian)源是市电(dian),市电(dian)的N线是接(jie)地的,所以,L对地电(dian)压(ya)220V,N对地电(dian)压(ya)是0V。
直流(liu)(liu)电(dian)(dian)源的技(ji)术指(zhi)标分为两种(zhong):一种(zhong)是特性指(zhi)标,包括允许输(shu)入(ru)电(dian)(dian)压(ya)(ya)(ya)、输(shu)出(chu)(chu)(chu)电(dian)(dian)压(ya)(ya)(ya)、输(shu)出(chu)(chu)(chu)电(dian)(dian)流(liu)(liu)及输(shu)出(chu)(chu)(chu)电(dian)(dian)压(ya)(ya)(ya)调节范(fan)围(wei)等;另一种(zhong)是质量指(zhi)标,用(yong)来(lai)衡量输(shu)出(chu)(chu)(chu)直流(liu)(liu)电(dian)(dian)压(ya)(ya)(ya)的稳定(ding)程度(du),包括稳压(ya)(ya)(ya)系(xi)数(shu)(或电(dian)(dian)压(ya)(ya)(ya)调整率)、输(shu)出(chu)(chu)(chu)电(dian)(dian)阻(或电(dian)(dian)流(liu)(liu)调整率)、纹波电(dian)(dian)压(ya)(ya)(ya)(周围(wei)与随(sui)机漂移)。
变频(pin)电源(yuan)是将市电中(zhong)的(de)交流电经过AC→DC→AC变换, 输出为纯净的(de)正弦波(bo),输出频(pin)率(lv)和电压 一定范围(wei)内可调。
直(zhi)流电源可(ke)以(yi)(yi)代替电压表(biao),因为它可(ke)以(yi)(yi)直(zhi)接将(jiang)电压、电流显示出来。
变(bian)频(pin)电(dian)源是将市电(dian)中的(de)交流电(dian)经过AC→DC→AC变(bian)换(huan), 输出为(wei)纯净正弦(xian)波(bo)的(de)转(zhuan)换(huan)器,具(ju)有(you)频(pin)率稳定(ding)、电(dian)压稳定(ding)、内阻(zu)等于零(ling)等优点。
在实际应用中,一(yi)些场合需要使用到接触器进(jin)行变频(pin)电源切(qie)换:如当(dang)变频(pin)故障(zhang)时切(qie)换到工频(pin)状态(tai)运行,或是当(dang)采(cai)用一(yi)拖(tuo)二方式(shi),一(yi)台(tai)电动(dong)机故障(zhang),变频(pin)电源转向拖(tuo)动(dong)另一(yi)台(tai)电动(dong)机等情(qing)况(kuang)。