A Novel DC-DC Boost Converter Based on Switched-Inductor / Switched-Capacitor with Very High Voltage Gain

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Department of Electrical Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran

Abstract

In this paper, a novel transformerless DC-DC boost converter with very high voltage gain is proposed. By modular extension of the proposed structure, more improvements can be obtained in converter voltage gain and switch stress. The developed converter is designed using switched inductor/capacitor circuits and all of the switches are controlled by a single pulse width modulation (PWM) unit. In the presented topology, inductors current and capacitors voltage are equal during different transient and steady-state conditions. For this reason, in the closed-loop control of the proposed chopper, multiple voltage and current sensors are not required for measurement of the state variables. Also, performance of the proposed converter is compared with similar circuits which are reported in recent years. Experimental response of the proposed converter is investigated in both Continuous (CCM) and Discontinuous Conduction Modes (DCM) of operation. The experiment results are provided to verify the theoretical analysis. Finally, using a standard linear double-loop controller, closed-loop response of the developed converter is regulated under load and input voltage changes. It is shown that a unique current feedback is enough for regulation of the converter output voltage.

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