Efficiency analysis of a sliding-mode controlled quadratic boost converter

Identifier:  imarina:5127311

Handle: https://hdl.handle.net/20.500.11797/imarina5127311

Authors:  Lopez-Santos, Oswaldo; Martinez-Salamero, Luis; Garcia, Germain; Valderrama-Blavi, Hugo; Mercuri, Daniel O

Abstract:
A quadratic boost converter with high DC gain to step -up the voltage of a stsndard photovoltaic panel up to 400 V is analysed. First of all, a compartive analysis among boost , quadratic boost,and cubic boost reveals that the quadratic boost exhibits the best trade-off between duty ratio range and converter efficiency.A hystetretic comparator is employed as a modulator to ensure the converter operation with high values of the duty ratio without risk of modulation saturation. A two-loop sliding-mosde control is used to regulate the output voltage error. An internal loop controls cycle by cycle the input current whose reference is established by an outer loop that processes the output voltage error by means of a proportional-integral compensatinf network The measured results in a 100 W prototype operating in continuous conduction mode of average values, ripples, frequency and efficiency for different equilibrium points are in good agreement with the theoretical predictions.