Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1996-10-08
1999-09-07
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Switching systems
Switch actuation
439188, 200 5109, 307113, 307147, H01H 326
Patent
active
059491604
ABSTRACT:
The invention comprises a battery coupled to a power bus, an external power connector coupled to the power bus for receiving an external power plug, and two switching devices for disconnecting the battery from the power bus when the external power plug is coupled to the connector. The battery supplies power to the camera unless the external power plug is coupled to the connector. Upon coupling of the external power plug to the connector, the two switching devices, which are positioned in series between the negative terminal of the battery and the system ground, are opened. The opening of the two switching devices disconnects the battery from the power bus and connector to prevent damage which could be caused by applying an externally supplied voltage from the external power plug across the positive and negative terminals of the battery.
REFERENCES:
patent: 4358135 (1982-11-01), Tsuge et al.
patent: 5475428 (1995-12-01), Hintz et al.
patent: 5475441 (1995-12-01), Parulski et al.
patent: 5477264 (1995-12-01), Sarbadhikari et al.
patent: 5493335 (1996-02-01), Parulski et al.
patent: 5530296 (1996-06-01), Masaki
Anderson Eric C.
Fullam Scott F.
Apple Computer Inc.
Gaffin Jeffrey
Kaplan Jonathan
Koerner Gregory J.
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