摘要：在电力系统的电源质量国际标准规定中,电网连接设备的线电流谐波要低于门限值;因此,要求AC-DC变流器运行时要具有高功率因数和低线电流失真。本文实现了一种用于电源系统的三相AC-DC48V电力电子变流器,并进行了相关的实验测试与讨论。在电源设计上的主要限制条件是要求功率密度达到每立方分米9000W,同时供电线路中不用中性线。

摘要：International standards impose several constraints concerning the electric power quality and require that the harmonic content of the line current of grid connected equipment is below assigned limits; for this reason, operating of AC-DC converters with high power factor and low line current distortion has become essential. In this paper, the prototypal realization of a three-phase AC-DC 48 V power electronic converter for telecom system supplying is described and experimental testing results are discussed. The main constraints in the power supply design are the required power density of about 900 W per dm3 as well as the absence of the neutral wire in the supply grid. The carried out investigation is focused on three-level power converter configurations which are considered in order to reduce voltage rating of power switches. As a result of the reduced voltage, low on-resistance metal-oxide-semiconductor field effect transistors can be used in the power stage, solution which allows to achieve improved efficiency as well as increased switching frequency with respect to the insulated gate bipolar transistors based two-level topologies.