×

Reversible DC motor drive including a DC/DC converter and four quadrant DC/DC controller

  • US 20030057916A1
  • Filed: 09/21/2001
  • Published: 03/27/2003
  • Est. Priority Date: 09/21/2001
  • Status: Active Grant
First Claim
Patent Images

1. A reversible direct current (DC) motor drive for a DC motor having a speed and a torque, said DC motor including first and second terminals for a field winding and third and fourth terminals for an armature winding, said DC motor operable in at least one of four quadrants including positive speed and positive torque, positive speed and negative torque, negative speed and negative torque, and negative speed and positive torque, said DC motor drive comprising:

  • at least two input terminals adapted to receive a DC voltage, said input terminals including first and second input terminals;

    first and second switches electrically connected in series between said first and second input terminals;

    first and second transistors electrically connected in series between said first and second input terminals;

    first and second diodes electrically connected in parallel with said first and second transistors, respectively, said first and second transistors having a first polarity, said first and second diodes having an opposite second polarity;

    a third diode;

    a third transistor electrically connected in series with said third diode, said third transistor having the first polarity, said third diode having the opposite second polarity;

    at least three output terminals, said output terminals including a first output terminal electrically interconnected with a first node between said first and second switches, a second output terminal electrically interconnected with a second node between said first and second transistors, and a third output terminal electrically interconnected with a third node between said third diode and said third transistor;

    means for determining a voltage between said first and second output terminals;

    means for determining a first current flowing between said second node and said second output terminal, and a second current flowing between said third node and said third output terminal;

    means for calculating the speed of said DC motor from the determined voltage, the determined first current and the determined second current; and

    means for controlling said first, second and third transistors and responding to the calculated speed of said DC motor to provide operation of said DC motor in said four quadrants and independent control of said first and second currents.

View all claims
  • 9 Assignments
Timeline View
Assignment View
    ×
    ×