A current-fed soft-switching three-phase dc-dc converter suitable for high-power high-voltage-gain applications is presented in this paper. Proposed converter consists of constant-current-fed three-phase inverting bridge with reverse-blocking switches, primary-Y-connected three-phase transformer and voltage-doubler rectifier modules at the output. The rectifier modules are connected in series at the output to achieve high-voltage-gain. By utilizing voltage-doubler rectifier modules instead of full-bridge diode rectifier modules, the voltage stress across the primary switches, input inductor and transformer windings can be significantly reduced. Leakage inductance of transformer is utilized to achieve zero-current switching and smooth current transition for primary switches. Benchmark comparison between proposed converter and existing converter with full-bridge diode rectifier modules is presented using digital simulations. Experimental results from hardware prototype validate the converter operation.