Design and Implementation of a Modified Luo Converter with Higher–Voltage Ratio Gain

Abstract

Abstract This paper presents a new modified of the positive output super—lift Luo (POSL) converter in order to increase the output voltage gain. The conventional elementary Luo converter has a voltage lift cell, which consists of one inductor, one diode and one capacitor. The main drawback of the elementary circuit is near conventional boost converter in terms of lifting output voltage at a higher duty cycle. The novelty of proposed modification provides high—voltage transfer ratio gain by changing the inductor (L) of the basic (POSL) with switched—capacitor—inductor cell, which consists of two diodes, one capacitor and two inductors. The advantages of the proposed converter over elementary circuit are can be increasing the output gain ratio at a lower and higher duty cycle as well as low voltage stress on switch. Pulse width modulation (PWM) as a voltage mode control strategy is used to control the new converter. The new converter works by using one switch to make the control simple, more efficient and more effective. In addition, the equations of voltage and current in continuous and discontinuous conduction modes (CCM) and (DCM) are analyzed at steady-state error. The simulation and practical results show the effectiveness of matching the new converter to the theoretical analysis as well as the proposed converter has higher efficiency is reached to 95.4% as compare with elementary circuit has 94.1%. The simulation is performing by Matlab/Simulink environment.