A 3kw prototype converter is built to verify the effectiveness of the improved converter and the best scheme for the blocking capacitor , and the experimental results are also included in this paper 本文將改進型零電壓全橋變換器應用于高壓直流二次電源dc dc變換器中,研制出一臺3kw工程樣機,并給出實驗結果。
This paper analyzes the operation principle , discusses the design of the block capacitor and the output inductance . a prototype converter rated 1 . 2kw is built in the lab to verify the effectiveness of the cdr zvs pwm h - fb tl converter 論文詳細分析了該變換器的工作原理,討論了開關管實現zvs的條件、阻斷電容以及濾波電感值的選取等,最后進行了實驗驗證。
The clamping diodes conduct only once in a switching period , and the resonant inductance current is smaller in zero state , leading to a higher efficiency and reduced duty cycle loss . the operation principle of the improved converter and the comparison with the original converter are analyzed in this paper . the effect of the blocking capacitor in series with the transformer or resonant inductance is discussed , and a best scheme is determined 本文將諧振電感和變壓器交換位置,使變壓器與滯后橋臂相連,這樣箝位二極管在一個開關周期中只導通一次,同時零狀態時諧振電感電流較小,有利于提高變換效率和減小占空比丟失,本文分析改進后變換器的工作原理,并與改進前的變換器進行對比,討論隔直電容在不同位置對變換器工作的影響,確定一種最佳工程方案。
( 2 ) each state of the total switching period has been studied in detail , in which the voltage of block capacitor and current of leakage inductance of main transformer and keeping time of each state have been discussed , then the condition of zero voltage switching is attained , which gives theory guidance for setting reasonable dead time , finally , the possibility of zero voltage switching is proved by simulation of saber software ( 2 )對不對稱半橋在一個完整的開關周期內各個狀態分析,描述了隔直電容電壓和變壓器漏感電流的變化規律,各個狀態的持,然后得出實現zvs的條件,從而為設置合理的死區時間提供了理論指導,最后用saber軟件進行了仿真,驗證了零電壓開關實現的可能性。