基于SA4828的组合式变压变频电源研制

提出了一种组合式三相变压变频电源的工作原理和电路结构。为降低逆变电路三相之间的耦合关系,采用由三组单相逆变组成一个三相逆变的方法,构成组合式逆变电路,使得三相间的相互影响得到很大降低。对输出波形的滤波提出了一种针对性强的有效滤波措施,使输出正弦波失真度降低到2.3%以下。结合波特图,给出了单级滤波和两级滤波的比较分析。试验结果显示,该装置变压变频功能控制灵活、简便、有效,能够较好地适应不同负载的用电要求。

Development of Combined Variable Voltage and Variable Frequency Power Supply based on SA4828

This article describes the operation principle and circuit scheme of a sort of three-phase combined vari-able voltage and variable frequency power supply.In order to reduce the coupling of three-phase in inverter,the power supply uses three single-phase inverters to form one three-phase inverter,constitutes a combined inverter circuit,and re-duces the influence among three-phase in a more excellent way.Proposing a pertinent measure of output makes the THD of the output waveform less than 2.3%.This paper provides the compare of one-stage filter and two-stages LC filter by the bode diagram.Experimental results are verified that the three-phase combined power supply has excellent electrical ca-pacity under various loads.