Switch circuit having excess-current detection function

Details Switch circuit having excess-current detection function Switch circuit having excess-current detection function

1997-11-19

2000-01-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327321, 327434, 361 96, 361 98, H02H 308, H02H 3027

Patent

active

060114169

ABSTRACT:
A microcomputer 4 responds to an instruction signal to turn the load L on or off to control the FET 2 through the drive circuit 5. The microcomputer 4 samples an electric current I.sub.L which is supplied through the A/D converter 6 and which flows in the load L at every predetermined sampling time T.sub.S and subjects the sampled electric current I.sub.L to a comparison with a known rated current value I.sub.R for the load L. When I.sub.L .gtoreq.I.sub.R is satisfied, the microcomputer 4 starts counting energizing time T. When the accumulated value of I.sub.L .times.T.sub.S is enlarged to a predetermined value S.sub.O, the microcomputer 4 turns the FET 2 off. When the detected electric current I.sub.L is larger than an upper limit I.sub.O (>I.sub.R) determined previously, the microcomputer 4 immediately turns the FET 2 off through the drive circuit 5.

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patent: 5774321 (1998-06-01), Kim et al.
patent: 5786970 (1998-07-01), Nao et al.
patent: 5898557 (1999-04-01), Baba et al.

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