Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1986-02-21
1987-11-10
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318443, 318444, 318293, H02P 104
Patent
active
047059974
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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Ip Shik Luen Paul
Schneeberger Stephen A.
Shoop Jr. William M.
United Technologies Automotive Inc.
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