固定导通时间半滞环脉冲序列控制Boost变换器研究

Constant on-time semi-hysteresis pulse train controlled Boost converter

针对工作于电感电流连续导电模式的脉冲序列控制开关变换器存在的低频振荡问题,提出了开关变换器的固定导通时间半滞环脉冲序列控制技术,分析了固定导通时间半滞环脉冲序列控制连续导电模式Boost变换器的工作原理及其控制规律。研究结果表明,半滞环脉冲序列控制消除了脉冲序列控制连续导电模式Boost变换器存在的低频振荡现象。

For pulse train（ PT） controlled switching converter operating in continuous conduction mode（ CCM）,the variation of energy stored in the inductor is not zero in a switching cycle,i. e. the power from the input power source is not completely delivered to the load in one switching cycle,which makes low-frequency oscillation to occur in the converter. In order to inhibit the low-frequency oscillation phenomenon existed in traditional PT controlled switching converter operating in CCM,constant on-time semi-hysteresis pulse train（ SHPT） control technique of switching converter is proposed. For SHPT controlled Boost converter operating in CCM,the variation of energy stored in the inductor is zero in a switching cycle,i. e. the power from the input power source is completely delivered to the load. Thus SHPT controlled CCM Boost converter can effectively inhibit the low-frequency oscillation. In this paper,SHPT controlled CCM Boost converter is studied. Experimental results show that SHPT control technique can inhibit the low-frequency oscillation phenomenon effectively.