Electronic apparatus having battery power source

Details Electronic apparatus having battery power source Electronic apparatus having battery power source

1997-03-07

1999-10-19

Brown, Glenn W.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324429, 320136, G01N 27416, G01R 3136

Patent

active

059695293

ABSTRACT:
A voltage monitoring circuit (4) detects when the output battery of a power source (e.g., battery) falls below a predetermined reference voltage. A controller (3), in response to the monitoring circuit, performs a load operation. In the load operation, a switch (8-1) in a pseudo-load circuit 8 is operated to connect a dummy load (8-2). On the basis of the output voltage of the power source when the dummy load is operable, the controller determines whether to allow a further drain on the power supply, e.g., connection of a peripheral device interface (10). In one embodiment, the pseudo-load circuit 8 has plural dummy loads which can be invoked to determine with which of plural possible loads (e.g., peripheral devices) the power source can be utilized. Also disclosed are both digital and analog methods and circuits for determining utilizable load magnitude by gradually raising power supply capacity. The invention solves numerous problems, including combatting an inrush current which can be produced when a card (such as a PCMCIA card) is inserted into an electronic apparatus such as a personal digital assistant.

REFERENCES:
patent: 5061898 (1991-10-01), Oram et al.
patent: 5416416 (1995-05-01), Bisher
patent: 5583440 (1996-12-01), Bisher
patent: 5773961 (1998-06-01), Cameron et al.

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