Control method for reducing quiescent current

Details Control method for reducing quiescent current Control method for reducing quiescent current

1994-04-22

1996-10-29

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

379 58, 455343, H04M 1100

Patent

active

055699650

ABSTRACT:
A control method applicable to a battery-driven portable device such as a portable radio telephone device for suppressing quiescent currents appearing when the device is not under operation, thereby extending the useful service life of an external power source such as a battery. In one example, required power inputs supplied to power input terminals for activating the total device system act as trigger inputs to a power control circuit including a pulse generator circuit, thereby generating a pulse during only a period controllably determined by a CR time constant circuit connected additionally to the pulse generator, and a CPU confirms sufficient conditions required for activating the system on the basis of outputs appearing on ports of the power control circuit. Only when the CPU decides that the power inputs to the system satisfy the sufficient conditions required for activating the system, the CPU sets a flag on a terminal to indicate that the system is to be activated, thereby starting operations of various regulators of the telephone device.

REFERENCES:
patent: 3808537 (1974-04-01), Sarati et al.
patent: 4962543 (1990-10-01), Kuge et al.
patent: 5149985 (1992-09-01), Fujiwara
patent: 5220681 (1993-06-01), Belgin
patent: 5335264 (1994-08-01), Namekawa

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