A quasi-resonant DC-DC Converter with high voltage gain and low current stresses on switches is proposed in this paper. This Converter preserved inherent advantages of current -fed structures, for instance: zero magnetizing DC offset, low input ripple and l ow transformer turn ratio. Moreover, by employing active clamp circuit, the voltage spikes across the main switch, due to existence of leakage inductance of isolating transformer is absorbed and switches work in Zero Voltage Switching  ( ZVS ) . Since quasi -resonant switching strategy is employed Turn-Off Current  ( TOC )  and losses of switches are considerably reduced. Because of Zero Current Switching  ( ZCS )  reverse recovery problem of diodes is alleviated. Experimental results on a 150 W prototype are provided to validate the proposed concept. Zero-current switching or natural commutation of primary devices and zero-voltage switching of secondary devices is achieved. Soft -switching is inherent owing to the proposed secondary modulation and is maintained during wide variation in voltage and power transfer capacity and thus is suitable for Photo Voltaic  ( PV )  applications. Primary device voltage is clamped at reflected output voltage, and secondary device voltage is clamped at output voltage. Steady -state operation and analysis, and design procedure are presented. It is suitable for grid-tied  ( utility interface )  as well as off-grid  ( standalone ) application based on the mode of control. The proposed converter attains clamping of the device voltage by secondary modulation, thus eliminating the need of snubber or active-clamp. Zero-current switching or natural commutation of primary devices is presented.