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Bidirectional motor drive circuit

  • US 4,705,997 A
  • Filed: 02/21/1986
  • Issued: 11/10/1987
  • Est. Priority Date: 02/21/1986
  • Status: Expired due to Term
First Claim
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1. Improved drive circuitry for a bidirectional inductive DC motor, the motor having first and second terminals for operative connection with a source of DC electrical power, said drive circuitry being for connection in series with said motor terminals across the source of DC electrical power and comprising:

  • four power MOSFETS operatively connected to said motor terminals in H-bridge configuration across the power source, including first and second high-side power MOSFETS operatively connected to said first and said second motor terminals respectively and first and second low-side power MOSFETS operatively connected to said first and said second motor terminals respectively;

    first and second input terminal means for receiving first and second control signals respectively, each said control signal being one of two logic states;

    first switching means operatively connected between said first input terminal and the gates of said first high-side and said first low side power MOSFETS for controlling conduction of said first high-side and said first low-side power MOSFETS in substantially complementary fashion; and

    second switching means operatively connected between said second input terminal and the gates of said second high-side and said second low-side power MOSFETS for controlling conduction of said second high-side and said second low-side power MOSFETS in substantially complementary fashion.

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