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This study investigates a new interleaved zero-current switching (ZCS) pulse-width modulation (PWM) boost converter with only one auxiliary switch to provide soft-switching condition. By using the interleaved boost converter technique, the input current ripple is reduced. Also because of the converter operation at ZCS, the reverse-recovery losses of diodes are minimised. In the proposed interleaved converter, soft-switching is obtained for all semiconductor devices resulting in high efficiency. In addition, the proposed circuit is controlled by the PWM method. Operation principles, theoretical analysis, design procedure and a design example are presented. Also, experimental results are presented to verify the validity of theoretical analysis.