Patent ID: 8587238
Filing Date: 2013-11-19
Classification: H02M,H02P,Y02B

Abstract:
1. A system for driving a direct-current (DC) motor under conditions of a controlled average current independent from a load, from a DC voltage source having a larger or smaller value than a nominal voltage of said DC motor, said system comprising: a diode; a magnetic transformer connected in series with said diode in a circuit arrangement selected from the group consisting of a flyback DC-DC converter and a ringing choke DC-DC converter, said magnetic transformer and said diode for connection in series with said DC motor; a switch coupled to said magnetic transformer and said diode for connecting and disconnecting a terminal of said magnetic transformer and said diode remote from said DC motor to said DC voltage source; a capacitor arranged for connection in parallel with said DC motor to limit a resulting voltage over said DC motor, said capacitor being capable of operating in a buck converter at the power level required to operate said DC motor and at the frequency of commutation of said switch; means for measuring a current through said DC motor; and means for controlling operation of said switch dependent upon said measured current in said DC motor.