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Portable electronic device and method for supplying current to different loads
| Details |
Inventors: Nakanishi, Eiichi; Onodera, Tetsuo;
Assignee: Oki Electric Industry Co., Ltd. (Tokyo, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Kincaid; Lester G.
Attorney, Agent or Firm: Spencer & Frank
According to a first aspect, a portable electronic device has at least two load circuits which are independently powered by different batteries. According to a second aspect, the load circuits are powered by the same battery, but their power lines are branched from a node located close to the battery, thereby reducing common impedance. According to a third aspect, two power lines are coupled through switches to two independent batteries, and are mutually coupled through a third switch. The switches are controlled according to the discharge states of the batteries. According to a fourth aspect, a battery charger charges two or more batteries by supplying current to them for short intervals in turn, so that all batteries reach full charge at substantially the same time. |
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DETAILED DESCRIPTION It is accordingly an object of the present invention to provide power with suitable voltage stability to all load circuits in a portable electronic device.
Another object of the invention is to make efficient use of charge in a plurality of batteries.
A further object is to recharge a plurality of batteries in such a way that all of the batteries reach full charge at substantially the same time.
Yet another object is to reduce audible noise in portable time-division-multiplexed communication devices.
According to a first aspect of the invention, a portable electronic device comprises a plurality of load circuits, and a like plurality of batteries for independently supplying current to the respective load circuits.
According to a second aspect of the invention, the load circuits are supplied with current by power lines branching from a node coupled to a single battery.
Each power line has a protective element that limits current flow to the corresponding load circuit.
According to a third aspect of the invention, a first load circuit is coupled to a first power line, and a second load circuit to a second power line.
The first power line is coupled through a first switch to a first battery, the second power line is coupled through a second switch to a second battery, and the first and second power lines are mutually coupled through a third switch.
The switches are controlled according to the states of discharge of the batteries.
According to a fourth aspect of the invention, a battery charger charges a plurality of batteries by supplying charging current to them in turn for intervals of time proportional to the uncharged capacities of the batteries, repeating this procedure until all of the batteries reach full charge.
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Electrical and Wave 
