Patent ID: 7439682

Claim:
A current driver for an inductive load comprising: a power generation system comprising a low level voltage source for providing voltage during a constant current mode of operation, a high level voltage source for providing voltage during a ramping mode of operation, a high frequency switching device coupled to the low level voltage source and the inductive load, and a switching device coupled to the high voltage source and the load to charge or discharge the coil, a full bridge for selecting the polarity of the current through the inductive load, and at least one additional switching device coupled to the low level voltage source and the high level voltage source for blocking current to flow from high voltage to low voltage during charge or discharge mode; and a control system coupled to the power generation system, wherein the control system comprises a controller to determine a duty cycle of a pulse width modulation waveform generated by the high frequency switching device, and wherein the control system operates the additional switching device to permit only one of the low level voltage source and the high level voltage source to provide voltage to the coil.