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System for operating DC motors and power converters

  • US 8,587,238 B2
  • Filed: 12/18/2009
  • Issued: 11/19/2013
  • Est. Priority Date: 07/22/2003
  • Status: Active Grant
First Claim
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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.

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