在大多数电力电子应用中,电力输入采用电力公司提供的50 Hz或60 Hz正弦波交流电压的形式,然后将其转换为直流电压。 越来越多的趋势是使用整流器和二极管以不受控制的方式将输入AC转换为DC。 因此,功率流只能从市电AC端流向DC端。 诸如开关直流电源,电动机驱动器,伺服驱动器等的大多数应用都使用这种不受控制的整流器。 在大多数这些应用中,整流器直接由公用电源供电,而没有50/60 Hz变压器。 在大多数现代应用中,避免使用这种昂贵且笨重的变压器非常重要。
In most power electronic applications, the power input is in the form of a 50 Hz or 60 Hz sine-wave AC voltage provided by the electric utility, which is then converted to a DC voltage. Increasingly, the trend is to convert the input AC into DC in an uncontrolled manner, using rectifiers and diodes. As such, the power flow can only be from the utility AC side to the DC side. A majority of applications such as switching DC power supplies, motor drives, servo drives, and so on, use such uncontrolled rectifiers. In most of these applications, the rectifiers are supplied directly from the utility source without a 50/60 Hz transformer. The avoidance of this costly and bulky transformer is important in most modern applications.
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