Modelling and Analysis of Non-ideal Two stage Lift Luo Converter with Positive Output

Abstract

High power applications such as motor drive control requires a higher voltage level of the DC-DC power converter fed from low-level DC input sources. For increasing the output voltage, a gain of the converter is increased using the pump circuit consisting of inductors and capacitors connected in different forms. The effect of adding the energy storage elements includes the parasitic resistances in the converter and affects the performance. This research paper is intended to model and investigate the effects of non-idealities in two stages cascaded lift circuit type Luo converter with positive output voltage. To analyze the non-ideal effects, state-space averaging (SSA) technique is used to model the converter. The converter is modeled in the presence of equivalent series resistance (ESR) of inductances and capacitances to study the effect of parasitic resistances on the converter performances. The transient and frequency response of the converter is plotted using the MATLAB simulation and observed that the ringing in the transient response is damped and oscillation at corner frequency is mitigated. The effect of ESR reduces the voltage gain and improves the stability of the system by increasing the gain and phase margin. Step response and bode plot of the converter is plotted at ideal and non- ideal condition.