采用分立元件實現的PWM Buck三電平變換器

摘要：本文闡述了用比較器、運算放大器和RS觸發器等分立元件實現PWM Buck三電平變換器的交錯控制。該方法控制電路簡單，易于實現，成本低，可以直接推廣到其它非隔離三電平變換器的控制中。首先介紹了交錯控制原理，然后給出了采用分立元件實現交錯控制的PWM Buck三電平變換器的設計方法，最后對輸入電壓為120V(90V~180V)，輸出為48V/4A，開關頻率50kHz的PWM Buck三電平變換器進行了實驗驗證。實驗結果表明，采用分立元件實現PWM Buck三電平變換器的控制是切實可行的。 敘詞：PWM Buck三電平變換器；分立元件 Abstract：In this paper,inerleaving control principle of PWM Buck three-level(TL) converter with discrete devices such as comparator,operational amplifier,and RS flip-folp was presented. The control circuit is simple,easy to be implemented,and cost less.So the control methods can be directly promoted to other non-isolated TL converters.Inerleaving control prinple was presented in detail at first in this paper.Then the design of PWM Buck TL converter with discrete devices was given.At last,PWM Buck TL converter with 120V(90-180V)input voltage,48V/4A output and 50 kHz switching frequency was experimented.Experimental results verified that interleaving control PWM Buck TL converter with discrete devices is feasible. Keyword：PWM Buck three-level converter discrete devices