2015 Volume 12 Issue 17 Pages 20150548
A pulse skipping modulation (PSM) with adaptive duty ratio (APSM) in buck converter application is presented in this paper. The output voltage of converter is regulated by the APSM controller generating control pulse with multiple duty ratios. The duty ratio is approximately proportional to the square root of the voltage error between output voltage of converter and reference voltage. The experimental results and simulation are well consistent with theoretical analysis. The duty ratio can vary adaptively with the variance of voltage error and load. The APSM modulation technology can regulate output voltage slightly and improve ripple of output voltage especially in light load.