Bidirectional motor drive circuit
First Claim
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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Accused Products
Abstract
A drive circuit is provided for a bidirectional DC inductive motor, as may be used for automotive window wipers and the like. Four power MOSFETS are connected in an H-bridge configuration with the motor and a DC source. A pair of input terminals receives respective direction-controlling logic signals. Respective intermediate switching circuits are connected between each input terminal and the high-side and low-side power MOSFETS connected to the same motor terminal for controlling those two power MOSFETS in a complementary manner. A braking signal may also be applied to the input terminals. A third terminal receives a pulse-width modulated control signal and extends it, via appropriate circuitry, to an appropriate one of the low-side power MOSFETS for speed regulation. The values of certain components of the drive circuitry are selected to minimize cross-conduction between certain power MOSFETS and to optimally accommodate the inductive effects of the motor and leads.
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Citations
13 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification