Motor driver interface fault detection apparatus using initial t

Details Motor driver interface fault detection apparatus using initial t Motor driver interface fault detection apparatus using initial t

1990-11-16

1992-05-05

Shoop, Jr., William M.

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 28, H02H 708

Patent

active

051111233

ABSTRACT:
A motor driver interface (MDI) circuit includes fault detection apparatus effective to detect short circuits to the power supply in the switching transistors of an H-bridge reversible DC motor arrangement. A pair of timers distinguishes a true fault condition. The first timer is responsive to a continuous fault detection to define a first time period from its initiation; and a second timer is responsive to a continuous presence of a transistor conduction signal to define a second time period from its initiation. The apparatus stores a fault signal in response to the detection of the fault condition at the end of the first or second time periods with the first timer providing fault detection upon turn-on after the brief initial high transistor turn-on current and the second timer providing noise immunity.

REFERENCES:
patent: 3555354 (1969-03-01), Kotos
patent: 4590533 (1986-05-01), Murata
patent: 4704653 (1987-11-01), Li
patent: 4725765 (1988-02-01), Miller
patent: 4901366 (1990-02-01), Rottger
patent: 4924158 (1990-05-01), Kelley et al.
patent: 5003426 (1991-03-01), Yeh et al.
patent: 5019779 (1991-05-01), Ookawa

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