Two-battery supply for operating and waiting modes of a carphone

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

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307 101, 307 48, 307 70, 307 86, 455345, H02J 906

Patent

active

051499851

ABSTRACT:
An apparatus for controlling a power supply of an electric machine in a vehicle comprises primary and secondary power supplies for supplying an electric power to the electric machine. In an engine-off state the primary power supply is selected as a power supply for the electric machine when an electric power consumption of the electric machine is over a predetermined value, indicating an operating mode, and the secondary power supply is selected when the consumption is below the predetermined value, indicating a waiting mode. Therefore, the absentee receiving of facsimile information, the absentee recording of telephone message, etc. are carried out, even in an ignition-off state. The secondary power supply is used mainly in the case that the electric machine is in waiting mode, so that the complete exhaustion of the secondary battery can be prevented.

REFERENCES:
patent: 4069675 (1978-01-01), Adler et al.
patent: 5033109 (1991-07-01), Kawano et al.
patent: 5060300 (1991-10-01), Luber et al.

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