Patent ID: 7190143

Claim:
A rectifier operable to receive a plurality of input voltages each having a phase, comprising: a positive bus; a negative bus; a plurality of main inductors, each coupled to one of the input voltage phases; a switching circuit coupled between the positive and negative buses and the main inductors, the switching circuit including a plurality of pairs of switching devices, each pair being associated with one of the input voltage phases; a controller operable to control the pairs of switching devices for each phase based on a reference voltage signal for each phase and a switching signal for each phase, the controller varying the frequency of the switching signal for a selected phase based on the value of the reference voltage signal for the selected phase to control ripple currents and power losses associated with switching the plurality of pairs of switching devices; and wherein the reference voltage signal for the selected phase has a maximum magnitude and a minimum magnitude, and the controller is operable to set the frequency of the switching signal to a first value during a first interval including the maximum magnitude and set the frequency of the switching signal to a second value during a second interval including the minimum magnitude.