Selective-calling receiver with battery switching upon CPU stop

Details Selective-calling receiver with battery switching upon CPU stop Selective-calling receiver with battery switching upon CPU stop

1994-04-18

1996-12-31

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455343, 34082544, H04Q 718

Patent

active

055904017

ABSTRACT:
A radio selective calling receiver including an exchangeable first battery and a second battery which can be charged by the first battery. A CPU stops operating at a stop voltage. A RAM stores a user data. A stop detector detects operational stop of the CPU. A power supply changer changes one of the first and second batteries into the other and selectively supplies one of electric energies of the batteries to the CPU, RAM and stop detector. The minimum operable voltages of the RAM and the stop detector are lower than the stop voltage. The first battery supplies its electric energy to the CPU, RAM and stop detector until the supply voltage of the first battery lowers to the stop voltage. The power supply changer changes the first battery into the second battery when the operational stop of the CPU is detected, so that the second battery supplies its electric energy to the CPU, RAM and stop detector until the first battery thus lowered in supply voltage is exchanged by a new one. The capacity of the first battery can be effectively used without any malfunction of the receiver and no troublesome reinput action is required for the user.

REFERENCES:
patent: 4908523 (1990-03-01), Snowden et al.
patent: 5272475 (1993-12-01), Eaton et al.

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