Dynamic protection circuit for a motor type load

Details Dynamic protection circuit for a motor type load Dynamic protection circuit for a motor type load

1997-06-19

1999-02-02

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 29, 361110, 318455, H02H 504

Patent

active

058673571

ABSTRACT:
An express down vehicle window lift motor drive system in which an overcurrent detection circuit (10) interprets the flow of electrical power to the lift motor when the motor current exceeds a threshold which is set dynamically as a function of motor in-rush or peak current. Motor current is measured as a small voltage drop across a current shunt. When the current level rises above the dynamically set threshold energization of the motor is halted.

REFERENCES:
patent: 3733532 (1973-05-01), Hill
patent: 5399950 (1995-03-01), Lu et al.
patent: 5483135 (1996-01-01), Parks
patent: 5539290 (1996-07-01), Lu et al.

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