06011416 is referenced by 23 patents and cites 11 patents.

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.

Title
Switch circuit having excess-current detection function
Application Number
8/974604
Publication Number
6011416
Application Date
November 19, 1997
Publication Date
January 4, 2000
Inventor
Yoshiyuki Miyazaki
Nagoya
JP
Motonori Kido
Nagoya
JP
Takashi Hoshino
Nagoya
JP
Fumiaki Mizuno
Nagoya
JP
Agent
Oliff & Berridge
Assignee
Sumitomo Electric
JP
Sumitomo Wiring Systems
JP
Harness System Technologies Research
JP
IPC
G01R 31/00
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