A new high-efficiency resonant boost converter is presented. The topology is a hybrid circuit between switchedresonator and switched-capacitor converters. The proposed converter can efficiently provide voltage conversion ratio between 1 and 2. The voltage gain is adjustable, and full-range zero-current switching operation is provided for switches independent from operating voltages and load power. The structure is formed by an inverter arm without employing any additional switch in the circuit. Passive elements are all high-frequency resonant type and then small size realisation is possible. The converter stability is guaranteed. Complete theoretical analysis along with simulation and practical results are presented. Finally, the converter is compared with its most recent counterparts.