Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1988-09-06
1990-01-16
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361100, 361111, 307 101, H02H 320
Patent
active
048947440
ABSTRACT:
In a multiplex system for automotive vehicles, battery (+V) current is supplied to a load (70) connected to a non-intelligent slave unit (20) via a power switch (TR) in the slave controlled by a capacitor (CT) which is charged or discharged in an assigned time slot by high or low drive voltage applied on a low current signal line (42) from a remote intelligent unit (10). If the load (70) goes short-circuit then a thyristor (TH) adjacent the power switch (TR) turns on to turn off the power switch (TR) and provide a discharge path for the capacitor (CT) via the load (70), this discharged condition being detected at the remote intelligent unit during an assigned load driving time slot. Thus a dedicated extra channel (time slot) is not required at the slave unit for short-circuit testing of the load.
REFERENCES:
patent: 4142115 (1979-02-01), Nakata et al.
patent: 4435648 (1984-03-01), Goode
patent: 4574266 (1986-03-01), Valentine
patent: 4575673 (1986-03-01), Teschi et al.
patent: 4733100 (1988-03-01), Nusairat et al.
Deboer Todd E.
Salplex Limited
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