High Step-Up Gain Converter Based on Two-Phase Interleaved Coupled Inductor Without Right-Hand Plane Zero
Meghna A. Vaghela, Mahmadasraf A. Mulla
Abstract
This article proposed a novel two-phase interleaved coupled inductor (CI)-based high step-up gain converter without right half-plane (RHP) zeros for a wide operating range of duty cycle. A CI between input and output is used in the proposed converter to eliminate RHP zero. The energy of CI is transferred to an output capacitor when switch is <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> to eliminate RHP zero. Furthermore, the converter has a wide operating range to eliminate RHP zero with a coefficient coupling of CI near one. Thus, the converter achieves a higher bandwidth and a wide range of control over output voltage. The small-signal model of the proposed converter is derived to verify the proposed claim. The single-loop voltage control is sufficient to regulate output voltage of the converter with a good stability margin and faster dynamic response for a wide range of load changes. In addition, the proposed converter has a high-voltage step-up gain and low voltage stress on switching devices compared with the boost converter. Moreover, interleaved operation at input side reduces ripple and increases power density. All theoretical findings are verified by simulation and experimental results. Experimental results are provided from implemented laboratory prototype of an input voltage of 24 V to an output voltage of 100 V and 200 W power.