Patent ID: 7161819
Filing Date: 2007-01-09
Classification: H02M

Abstract:
1. An apparatus for driving an inductive load comprising: a full H-bridge including a first pair of switches connected in a first polarity between a voltage supply, the inductive load, and ground, respectively, and a second pair of switches connected in a second opposed polarity between the voltage supply, the inductive load, and ground; control means for generating a first PWM signal and a first current cycle direction and a second PWM signal and a second current cycle direction to the first and second pair of switches, respectively; means for establishing a threshold as a percentage of a full voltage supplied to the load; and in response to the magnitude of the voltage to be applied to the load, the control means applying the first and second PWM signals to the load when the applied voltage is greater than the threshold and generating and applying an adjusted voltage to the load when the applied voltage is less than or equal to the threshold.