Abstract: A two-switch, two-inductor boost converter achieves output-voltage regulation in a wide input-voltage and load-current range using a constant-frequency by employing an auxiliary transformer to couple current paths of the two boost inductors so that both inductors carry the same current. By forcing the current through the boost inductors to be the same, the energy in both inductors is forced to change in unison, i.e., both inductors increase the energy when both switches are turned on simultaneously and decrease (transfer) energy when either of the converter's two switches is turned off. As a result, the stored and transferred energy of both inductors can be controlled in a wide input-voltage and load range using a constant-frequency control by controlling the time duration that the two switches are simultaneously on.