Effects of modulations on the sub-harmonic oscillations of digital peak current and digital valley current controlled switching DC-DC converters
Effects of modulations on the sub-harmonic oscillations of digital peak current and digital valley current controlled switching DC-DC converters
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DOI：
10.1109/ipemc.2009.5157593
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Guohua Zhou;Jianping Xu;Changbao Mi;Yanyan Jin
中科院分区：
文献类型：
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作者：
Guohua Zhou;Jianping Xu;Changbao Mi;Yanyan Jin
分析了数字峰值电流（DPC）和数字谷值电流（DVC）控制开关DC-DC变换器工作在连续导通模式（CCM）下的次谐波振荡。研究了DPC和DVC控制的控制规律及其相应的次谐波振荡。针对传统后沿调制DPC控制和前沿调制DVC控制中存在的次谐波振荡问题，提出了数字斜率补偿（DSC）方法。结果表明，采用前沿调制的DPC控制变换器和采用后沿调制的DVC控制变换器均不存在次谐波振荡，且均能改善变换器的暂态性能。实验结果验证了分析结果。
Sub-harmonic oscillations of digital peak current (DPC) and digital valley current (DVC) controlled switching dc-dc converters operating in the continuous conduction mode (CCM) are analyzed in this paper. The control laws of DPC and DVC control and their corresponding sub-harmonic oscillations are studied. Digital slope compensation (DSC) method is proposed to eliminate the sub-harmonic oscillations of conventional DPC control with trailing-edge modulation and DVC control with leading-edge modulation. It is pointed out that no sub-harmonic oscillations exists in both DPC controlled converters with leading-edge modulation and DVC controlled converters with trailing-edge modulation, and improved transient performance can also be achieved in this case. Experimental results are given to verify the analysis results.