Patent ID: 8040706

Claim:
A method of switching power in a controller for pulse width modulation of an inductive load comprised of: providing a power controller with a top switch set and a bottom switch set, each of said switch sets further comprised of two power switches and each of said power switches having a diode associate with it, and each of said power switches having a state of on or off; selecting a first of the switch sets by choosing the bottom switch set if the input voltage and load current are of the same polarity or choosing the top switch set if the input voltage and load current have opposite polarities; in the selected first switch set, switch on the power switch that has the anode of its associated diode facing positive input voltage; then switching the states of both power switches in the second of the switch sets; then switch on the power switch of the first switch set that has the anode of its associated diode facing negative input voltage.