Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Plural cells
Patent
1998-02-13
2000-07-11
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Plural cells
429 9, H01M 220, H01M 230
Patent
active
060870397
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an accumulator device for an apparatus intermittently operating between a standby state and an active state, comprising: element, element.
The invention also relates to a telecommunication terminal comprising such a device.
Such a device finds highly significant applications, notably for telecommunication apparatus such as terminals for cordless telephone, GSM, . . . , and so on.
A device of this type is described in European Patent No. 0 688 082. This document proposes to extend a main accumulator by a back-up accumulator so that, when the main accumulator is discharged, it can be exchanged without data being lost, because the energy of the back-up accumulator is sufficient for maintaining them.
The invention proposes a device of this type which may provide the backup function, but which is rather adapted to the apparatus operating intermittently. This is notably the case with terminals of the GSM network which, when they are communicating, work only one eighth of the time.
SUMMARY OF THE INVENTION
Therefore, such a device is characterized in that it furthermore comprises: comprises at least one switch element, assembly to said apparatus during the active state.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows a terminal according to the invention,
FIG. 2 shows a GSM frame, and
FIG. 3 shows a device according to the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
The terminal shown in FIG. 1 is a GSM terminal, for example. It comprises a casing 1 on which are provided a microphone 2, a screen 3, a keypad 4, an earpiece 5 and an antenna 6. For supplying power to this device, it includes two accumulator assemblies 10 and 11. The accumulator 10 is the main accumulator which forms what may be called the pack battery and the accumulator 11 is placed inside the casing 1 and forms an auxiliary accumulator represented in a dashed line in the Figure.
The terminal concerned can only transmit in time slots . . . T1, T2, T3, . . . provided in a time frame generated by the GSM transmission system. This time frame is represented in a diagrammatic form in FIG. 2. These time slots . . . T1, T2, T3, . . . are separated by seven time slots during which the terminal is in the state of rest.
According to the invention, the power to the terminal is supplied by the auxiliary accumulator during the time slots . . . T1, T2, T3, . . . .
The device that provides this power supply is shown in FIG. 3. The accumulator 10 may be formed by an assembly of accumulator elements of the lithium type which may contain much energy but which cannot rapidly restore the energy in their charging circuit. The accumulator 11 may be formed by an assembly of accumulator elements of the lead-acid type as described in U.S. Pat. No. 5,047,300. This type of accumulator is well adapted to rapid discharges in their charging circuit. These two accumulators 10 and 11 are connected by a connection circuit formed by: which interconnects the accumulators 10 and 11, 26 for adapting the voltage produced by the accumulator 11 with the voltage required by the terminal across its power supply terminal 27, and
The circuit 21 may be formed by a simple wire, or also a circuit which regulates the load of the assembly 11.
Reference 30 indicates in this figure the electronic circuit of this terminal. In this circuit 30, a signal is derived which is active during said time slots . . . T1, T2, T3, . . . , notably coming from a microprocessor 35 which manages the transmission time.
Based on this signal, a control circuit 40 supplies control signals to the switch elements 20 and 25 in the following manner.
When the terminal is in the state of rest, it is directly fed by the accumulator 10 and the switch element 20 is closed, so that the charging of the accumulator 11 is ensured. The switch element 25 is open.
When the terminal is in the active state, it is fed by the
REFERENCES:
patent: 3200014 (1965-08-01), Roberts
patent: 3758345 (1973-09-01), Toth
patent: 5047300 (1991-09-01), Juergens
patent: 5549984 (1996-08-01), Dougherty
patent: 5849426 (1998-12-01), Thomas et al.
patent: 5857148 (1999-01-01), Weisshappel et al.
Dove Tracy
Halajian Dicran
Nuzzolillo Maria
U.S. Philips Corporation
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