Power source switch circuit

Telecommunications – Transmitter and receiver at same station

Patent

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Details

455 89, 455127, 455343, 455345, 307 101, 307126, 307140, 379 58, H04B 138, H02G 300, H01H 326, H04M 1100

Patent

active

051704919

ABSTRACT:
A power supply control circuit for use in an automobile telephone to which power is supplied in response to a power switch signal and to an ignition voltage. The power switch signal is generated by a power switch in a handset of the telephone. The ignition voltage is produced by turning on an ignition key. The power supply control circuit comprises an emergency switch which manually produces an emergency switch signal. An emergency switch monitor circuit monitors the state of the emergency switch and produces an emergency control signal when it receives the emergency switch signal. Upon the emergency control signal, an ignition voltage control circuit produces the ignition voltage regardless of the condition of the ignition key. Upon the emergency control signal, a power switch control circuit produces the power switch signal regardless of the condition of the power switch. By receiving the ignition voltage from the ignition voltage control circuit and the power switch signal from the power switch control circuit, the automobile telephone can quickly be turned on in an emergency situation.

REFERENCES:
patent: 4538074 (1985-08-01), Fraden
patent: 4649286 (1987-03-01), Takeda et al.
patent: 4733100 (1988-03-01), Nusairat et al.
patent: 4893348 (1990-01-01), Andoh

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