Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1991-07-22
1993-04-20
Pellinen, A. D.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307117, B60L 100, H02H 718
Patent
active
052049914
ABSTRACT:
An on/off circuit is provided to automatically turn "on" or "off" electrical power to electrical outlets depending upon whether an automobile engine is "on" or "off". The circuit is powered by the automobile battery via a plug inserted into an automobile cigarette lighter socket. The circuit includes a mechanical vibration sensor, namely a piezoelectrical transducer, that monitors engine vibrations. Upon detection of vibrations, the sensor outputs a signal that is amplified by an operational amplifier before being rectified and filtered into a signal that triggers a transistor to switch a power supply circuit "on". Energization of the power supply circuit provides power to one or more electrical sockets. The power supply circuit includes a current limiting circuit (featuring a Darlington transistor) to protect against high current damage. When the sensor notes an absence of vibrations, the on/off circuit shuts off the power supply circuit.
REFERENCES:
patent: 4354217 (1982-10-01), Mahon
patent: 4733100 (1988-03-01), Nusairat et al.
patent: 4950913 (1990-08-01), Kephart
patent: 4977476 (1990-12-01), Marshall et al.
patent: 5073721 (1991-12-01), Terrill et al.
Kivenson Gilbert
Osborn David
Pellinen A. D.
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