Hand-held electronic apparatus using two batteries sequentially

Details Hand-held electronic apparatus using two batteries sequentially Hand-held electronic apparatus using two batteries sequentially

1992-10-29

1994-10-25

Peng, John K.

Communications: electrical

Systems

Nonselective paging

34082548, 340636, 340663, 340455, 320 48, 320 13, 320 38, 320 40, 307 107, 361 92, H04Q 130

Patent

active

053593189

ABSTRACT:
In a hand-held electronic apparatus, such as radio display pager, a control circuit is powered by a first battery to produce an control signal for operating an inductive device such as vibrator. A second battery is provided having an internal resistance lower than the internal resistance of the first battery. A capacitor is connected in parallel with the inductive device and the voltage developed thereacross is monitored by a voltage sensor, which produces a sensor output when the voltage exceeds a prescribed level. A first switching circuit is responsive to the control signal for coupling the inductive device to the second battery and responsive to the sensor output for decoupling it from the second battery. A second switching circuit also responds to the sensor output for coupling the inductive device to the first battery until the control signal ceases to exist.

REFERENCES:
patent: 4755816 (1988-07-01), DeLuca
patent: 4908523 (1990-03-01), Snowden et al.
patent: 4940975 (1990-07-01), Ide et al.

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