Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1995-09-21
1998-11-10
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 101, 307 107, 180 651, G08B 2500
Patent
active
058348549
ABSTRACT:
In one embodiment of the present invention, a motor vehicle electrical system has a plurality of electronic modules. The electrical power input of each module is coupled to the output of a switching power supply. Further, the electrical power input of each module is switchably coupled to vehicle system voltage. During "key-on", the switchable connection to vehicle system voltage is closed, thereby providing "key-on" power for the modules from system voltage. During "key-off", the switchable connection is opened, thereby providing "key-off" power for the modules from the switching power supply. In a second embodiment of the present invention, a motor vehicle electrical system has at least one electronic module with a normal power input and a "key-off" power input. The normal power input is coupled to vehicle system voltage, and the "key-off" power input is coupled to the output of a switching power supply. Systems embodying the present invention can reduce "key-off" current draw from the vehicle battery.
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Ford Motor Company
Gaffin Jeffrey A.
Ganjian Peter
Sparschu Mark S.
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