一种消除电压尖峰的改进型Pseudo-Boost变换器  

Improved Pseudo-Boost converter with elimination of voltage spike

作　　者：韩辉辉[1] 许建平[1] 陈章勇[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电工电能新技术》2014年第8期28-31,37,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：Pseudo-Boost变换器具有双极性增益,在正负电压输入时,均可得到正极性的输出电压,因此Pseudo-Boost变换器可以作为无桥PFC变换器。然而,在Pseudo-Boost变换器开关管关断时刻,Pseudo-Boost变换器的升压电感与谐振电感形成串联支路,引起电感电流跃变,导致严重的电压尖峰,限制了Pseudo-Boost变换器的实际应用。针对这一问题,本文提出了一种改进型Pseudo-Boost变换器,通过在谐振电感两端并联一个开关管,避免了Pseudo-Boost变换器工作过程中电感串联支路的出现,消除了电压尖峰。详细分析了工作于临界导电模式的改进型Pseudo-Boost变换器的工作模态及稳态特性。最后,通过实验验证了理论分析的正确性。此外,该方案同样适用于连续模式和断续模式。Under both positive and negative input voltage, the output voltage of Pseudo-Boost converter is positive, i. e. Pseudo-Boost converter has bipolar voltage gain, which makes it acting as a bridgeless PFC converter. For the Pseudo-Boost converter, when the switch is turned off, boost inductor is connected in series with resonant inductor, which makes a step change of inductor current, and thus produces a serious voltage spike. This voltage spike may limit the application of Pseudo-Boost converter. In this paper, to eliminate the voltage spike at the time when the switch is turned off, an improved Pseudo-Boost converter is proposed by connecting a switch in parallel with the res-onant inductor. Experimental results are provided to verify the theoretical analysis results. Furthermore, the scheme can be applied to both continuous conduction mode and discontinuous conduction mode.

关 键 词：Pseudo—Boost变换器 临界导电模式 电感电流 电压尖峰 

分 类 号：TM46[电气工程—电器]