A Single-Input Multiple-Output Unity Power Factor Rectifier

The increasing consumer electronics, most of which are natively dc loads, demand efficient power conversion from input ac grid to dc loads. Good power quality and unity power factor (UPF) for maintaining a stable grid can be achieved using power factor correction (PFC) circuits. This article proposes a family of single-input multiple-output (SIMO) rectifiers, which can provide one dc output higher and multiple dc outputs lower than the peak voltage of the ac input. Compared to separate conventional rectifiers at every point-of-load, each with a boost-based PFC circuit followed by a buck converter, the proposed topology requires a less number of switches and has inherent shoot-through protection. In this article, the operation of an N-output (N-switch) rectifier is explained, and its general large-signal and small-signal models are developed. It is further illustrated using a single-input dual-output (SIDO) rectifier. Of the two dc outputs, one dc output voltage is higher, and one is lower than the peak voltage of the ac input. The small-signal model and the control scheme to enforce output voltage regulation and UPF operation are discussed. Experimental results are provided to validate the proposed topology and the control scheme.