Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-06-03
1999-04-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327110, 361 18, 361 93, 323277, G05F 110
Patent
active
058923896
ABSTRACT:
A method and circuit (10) for limiting current (I.sub.COIL) in a load (16). The current limiting circuit (10) includes a sensing circuit (12) having a current indicator output terminal (20) connected to an inverting input of a comparator (11). A reference voltage node (24) of a reference voltage generator (13) is connected to the non-inverting input of the comparator (11). The comparator (11) generates an output signal in accordance with the current flowing in the load (16). If an overcurrent condition exists, the signal from the comparator (11) disables a control circuit (14) which turns off the sensing circuit (12). With the control circuit (14) disabled and sensing circuit (14) off, the current (I.sub.COIL) is prevented from flowing through the load (16).
REFERENCES:
patent: 4429339 (1984-01-01), Jaeschke et al.
patent: 4750079 (1988-06-01), Fay et al.
patent: 5144514 (1992-09-01), Sekigawa et al.
patent: 5222707 (1993-06-01), Szepesi et al.
patent: 5282107 (1994-01-01), Balakrishnan
patent: 5386158 (1995-01-01), Wang
patent: 5483182 (1996-01-01), Rybicki
patent: 5510943 (1996-04-01), Fukunaga
patent: 5541799 (1996-07-01), Schmidt et al.
Callahan Timothy P.
Coleman Sharon K.
Kim Jung Ho
Motorola Inc.
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