140NOM21100 工业电器
该类电源也称一次电源，它自电网取得能量，经过高压整流滤波得到一个直流高压，供DC/DC变换器在输出端获得一个或几个稳定的直流电压，功率从几瓦－几千瓦均有产品，用于不同场合。属此类产品的规格型号繁多，据用户需要而定通信电源中的一次电源(AC220输入，DC48V或24V输出)也属此类。
（2）DC/DC
在通信系统中也称二次电源，它是由一次电源或直流电池组提供一个直流输入电压，经DC/DC变换以后在输出端获一个或几个直流电压。
（3）通信电源
通信电源其实质上就是DC/DC变换器式电源，只是它一般以直流－48V或－24V供电，并用后备电池作DC供电的备份，将DC的供电电压变换成电路的工作电压，一般它又分中央供电、分层供电和单板供电三种，以后者可靠性高。
（4）电台电源
电台电源输入AC220V/110V，输出DC13.8V,功率由所供电台功率而定，几安几百安均有产品。为防止AC电网断电影响电台工作，而需要有电池组作为备份，所以此类电源除输出一个13.8V直流电压外,还具有对电池充电自动转换功能。
（5）模块电源
随着科学技术飞速发展，对电源可靠性、容量/体积比要求越来越高，模块电源越来越显示其性，它工作频率高、体积小、可靠性高，便于安装和组合扩容，所以越来越被广泛采用。国内虽有相应模块生产，但因生产工艺未能赶上国际水平，故障率较高。
DC/DC模块电源虽然成本较高，但从产品的漫长的应用周期的整体成本来看，特别是因系统故障而导致的高昂的维修成本及商誉损失来看，选用该电源模块还是合算合算的，在此还值得一提的是罗氏变换器电路，它的突出优点是电路结构简单，效率高和输出电压、电流的纹波值接近于零。
（6）特种电源
高电压小电流电源、大电流电源、400Hz输入的AC/DC电源等，可归于此类，可根据特殊需要选用。开关电源的价位一般在2-8元/瓦特殊小功率和大功率电源价格稍高，可达11-13元/瓦。
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