Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1996-02-16
1997-12-30
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 45, 361 57, H02H 504
Patent
active
057037469
ABSTRACT:
Wiring harnessess are current feedback paths from the loads to a battery, thereby forming a closed-circuit. For each load, there are provided a current detector and a current control; each current detector compares the current input to a junction box to the output current from the corresponding load via a corresponding wiring harness, and outputs a normal state signal when the two currents are equal. When the input and output currents are at variance with each other, it outputs an abnormal state signal. Each current controller causes, upon receipt of the normal state signal, the input current to flow into the corresponding load along normal current path; upon receipt of the abnormal state signal, the input current is directed to flow to a current cutoff which includes a thermal device which is disposed in parallel with the current path and whose resistance value changes with temperature, thereby cutting off the flow of current to the load. Since the flow of current into each load can be cut off based on variation of the resistance value of the thermal device, the need for replacement of fuses, is thereby obviated and maintenance is simplified.
REFERENCES:
patent: 4344100 (1982-08-01), Davidson et al.
patent: 4977477 (1990-12-01), Babico et al.
Onizuka Takahiro
Saka Yuuji
Bierman Jordan B.
Gaffin Jeffrey A.
Sherry Michael J.
Sumitomo Wiring Systems Ltd.
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