H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 7/085 (2006.01) G01R 31/02 (2006.01) G01R 31/40 (2006.01) H02H 1/04 (2006.01) H02H 7/08 (2006.01) H02P 3/08 (2006.01)
Patent
CA 2042344
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.
Hach Larry Raymond
Kelley Gerard Francis
Delco Electronics Corporation
Gowling Lafleur Henderson Llp
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