Analysis of output capacitor parasitic effects to output voltage ripple on power converter

Abstract

This paper provides analysis of output capacitor parasitic effects to output ripple on power converter and verification is made by experiments, thereby giving suggestions to persons skilled in the related art. Generally, a capacitor roughly consists of a nominal capacitance, an equivalent series resistance (ESR) and an equivalent series inductance (ESL) where ESR and ESL are called the parasitic elements. According to the parasitic effects, this paper distinguishes the associated capacitors into three models for steady state analysis, and each model can be divided as three states corresponding to the comparison two ripple magnitudes, except first model. Also, the transient responses with output capacitors are analyzed to verify the effects further. Finally, experimental results confirm the theoretic analysis.