Aluminium Electrolytic Capacitor Model for Capacitor Materials Structure Transformation Analysis in PWM Applications

The electrolytic capacitor is widely used in power electronics applications. These converters mainly operate with PWM (Pulse Width Modulation) which is commonly used circuit control technique currently. The widely known and generally used capacitor models can not represent or model the exact behavior of the component in switch mode applications. Consequently, the physical structure of the capacitor is not represented properly. A novel model has been introduced which represents precisely the physical structure of the capacitor taking into account all structural elements. The electrical behavior of the novel model has been validated by circuit simulations. Utilizing the model, simulation results provided detailed information of component stress which helps to find an explanation to the effects of electrochemical processes in capacitors.