Lear Corporation
Method of early hard switching detection and protection for inductive power transfer

Abstract:

An inductive power transfer system includes a power converter and a controller. The power converter includes switches. The controller to switch the switches according to a schedule to cause the power converter to output a voltage and a current to a resonant network. The controller to compare a zero-current crossover point of the current and the schedule to determine whether the zero-current crossover point occurs prior to a scheduled time that one or more of the switches are be switched. The controller to disable the switches from switching when the zero-current crossover point occurs prior to the scheduled time such that the switches do not switch at the scheduled time thereby preventing hard switching of the switches from occurring.