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Current controlled motor amplifier system

  • US 6,683,437 B2
  • Filed: 10/31/2001
  • Issued: 01/27/2004
  • Est. Priority Date: 10/31/2001
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • providing a substantially constant current source on each leg of a top half of an H bridge configuration;

    providing a switch on a bottom half of each leg of the H bridge configuration;

    switching on the substantially constant current source for a predetermined time and an appropriate switch to operate the top half of the H bridge configuration essentially as a linear substantially constant current source and the bottom half of the H bridge configuration in switching mode; and

    achieving overvoltage protection in the current controlled motor amplifier by;

    disabling the substantially constant current source on each leg;

    enabling power transistors on each side of the H bridge configuration;

    inducing a circulation current through a ground plane to limit back EMF induced motor voltage;

    dissipating the back EMF induced motor voltage in a motor winding via the circulation current; and

    including signal conditioning circuitry to control a duration of the overvoltage protection.

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