Abstract—In this paper, a new step up dc-dc converter with a coupled inductor for isolated power system. Theoretically the conventional boost converter provides high step up voltage gain but in practical it is limited by reverse recovery problem of diode, effective series impedance of inductors and capacitors and switching losses. High charged current and conduction losses occur in the switch when voltage lift and switched capacitor techniques are used. In the proposed strategy a coupled-inductor and two capacitors is utilized to achieve high step-up voltage gain. High power loss and voltage spike on the switch is avoided using passive clamp circuit that recycles the leakage inductor energy. The operating principle and steady-state analysis are discussed. The Proposed topology was simulated using Matlab/Simulink environment and the following results were obtained. For an input voltage of 24 V, an output of 393 V was obtained.

Index Terms—High step-up, Coupled inductor, Distributed Generation (DG), Reverse-recovery, Gain

Cite: Akash Javali and Pius Pinto A J, "A NEW STEP-UP DC-DC CONVERTER FOR ISOLATED POWER SYSTEM," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 1, No. 1, pp. 183-189, March 2015.