Small-signal analysis and design of weighted voltage-mode control for a multiple-output forward converter

The small-signal model for a multiple-output forward converter with weighted voltage-mode control is derived. The effects of the weighting factors on the small-signal behavior are investigated. In addition, the small-signal characteristics of weighted voltage-mode control are compared with the characteristics of a multiple-output converter with coupled output-filter inductors. Finally, the effects of weighted voltage-mode control on the small-signal characteristics of the converter with coupled inductors are examined. Based on the analysis, the design procedure for loop compensation is presented. The small-signal model and the design procedure are verified on an experimental two-output forward converter.