One-cycle PFC technique has advantages of AC voltage sensor elimination and simplified current loop, thus it has been utilized on various rectifier topologies. In this paper, a modified one-cycle PFC method for the delta-connected cascade H-bridge (CHB) rectifier is proposed, which combines the one-cycle PFC control, zero-sequence current injection control and DC voltage balancing control. With the proposed method, unity power factor, unbalanced phase load compensation and DC voltage balance are achieved without using AC-side voltage sensors. The validity of the proposed method is verified by both switching-model simulation and experiment results.