，輸出電容為

，開關(guān)頻率為

，工作占空比為D=0.4，高頻變壓器原副邊匝比為n=1：3，輸出電流為

。

圖7 (a) 為開關(guān)管的驅(qū)動波形。圖7 (b)、圖7 (c)和圖7 (d)為激磁電感值分別取

5.結(jié)論

本文分析了雙正激變換器的兩種穩(wěn)定工作狀態(tài)，得出了在不同數(shù)目MOSFET并聯(lián)下，高頻變壓器能正常復(fù)位時的高頻變壓器的激磁電感、電路工作占空比和開關(guān)頻率之間的關(guān)系。結(jié)果表明，當(dāng)主開關(guān)由多個MOSFET并聯(lián)時，激磁電感值應(yīng)合理設(shè)計以變壓器的正常復(fù)位。

參考文獻

[1]Han Feng, Dehong Xu and Y.S.Lee, “Comparison of Interleaving Methods of Two-Transistor Forward Converter”, PEDS’99, July 1999.

[2]Feng Han, Xu Dehong and Mikihiko Matsui, “A Novel ZVT Circuit for Interleaving Two-transistor Forward Converter”, Apec’2000.

[3]C.H.G Treviso, A.A.Pereira, etal, ”A 1.5kw operation with 90% efficiency of a two transistor forward conveter with non-disspative snubber”, PESC’98, P696-700.

[4]Michael T. Zhang; Milan M, Jovanovic and F.C. Lee, “Analysis and evaluation of interleaving Techniques in forward converters”, IEEE Trans. on PE. Vol.13, No.4, July 1995.