Multiphase DC-DC converter control using single current sensor

摘要

A multi-phase DC-DC converter (MPC) 38 having a first phase-leg 34 and a second phase-leg 36 is controlled using a single current sensor 40 and a controller 42. A DC link 52 is provided that connects the first phase-leg 34 and the second phase-leg and also connects the converter to a load 49. The single current sensor senses an amount of current flowing through the direct current link 52. Based on the amount of current sensed, the controller controls current flowing through the first phase-leg as well as current flowing through the second phase-leg. The converter may be a two stage MPC having two phase legs, a three stage MPC having three phase legs in parallel or a MPC having any number of phase legs connected in parallel. The control system may be part of a power train in an automotive vehicle such as a hybrid, fuel cell or battery electric vehicle.