Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Patent
1998-02-19
1999-11-02
Paladini, Albert W.
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
307 66, 307 85, 320117, 320162, H02J 700
Patent
active
059776579
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a power supply device for producing on a plurality of accesses a plurality of voltages coming from a plurality of accumulator assemblies formed by at least one accumulator element and connected in series by at least one series connection.
The invention also relates to an apparatus comprising such a device.
Such a device finds highly significant applications notably in the field of cordless telephone sets. Actually, these sets comprise, on the one hand, high-frequency circuits which call for relatively high voltages, and, on the other hand, logic circuits which call for less high voltages.
A device of this type is described in European Patent No. 0 624 944. This known device makes use of DC voltage converters which are considered costly, cumbersome and heavy. They are thus not suitable for the application discussed above where, for reasons that the apparatus must be portable, a small weight and as small dimensions as possible are needed while a reasonable cost price is maintained.
The invention proposes a device of the type mentioned in the opening paragraph which largely remedies the drawbacks of price, size and weight presented by the known device.
SUMMARY OF THE INVENTION
Therefore, a device of the type defined in the opening paragraph is characterized in that it comprises auxiliary means for mitigating discharges by at least one of the accumulator assemblies.
BRIEF DESCRIPTION OF THE DRAWING
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
In the drawings:
FIG. 1 shows an apparatus according to the invention,
FIG. 2 shows a device according to the invention, and
FIG. 3 shows a preferred embodiment of an evaluation circuit which forms part of a device according to the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
The apparatus shown in FIG. 1 is a Global System for Mobile Communications (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 a power supply device 10 according to the invention, whose diagram is shown in FIG. 2.
The device shown in FIG. 2 is intended to provide two different voltages on accesses 15 and 16 and also on accesses 17 and 16. These voltages, seen from a common voltage line 18 connected to the access 16, are necessary for supplying power to the electronic part 20 of the apparatus. This electronic part comprises logic circuits for managing the apparatus, fed via the accesses 17-16, and a radio circuit formed by a receiver circuit and a transmitter circuit which need to have a relatively high supply voltage. The radio circuit is fed by the voltage present on accesses 15-16.
For obtaining these voltages, two accumulator assemblies 25 and 26 connected by a series connection 27 are used. This series connection comprises a branch point 30. The first voltage is formed by the voltage of the first assembly 25 occurring at accesses 17 and 16. The branch point 30 is then connected to access 17. The second voltage is formed by the fact that the two assemblies, whose ends again occur at accesses 15 and 16, are combined in series.
The charging state of the assemblies 25 and 26 is evaluated by an evaluation circuit 35 which produces an active signal S when an accumulator assembly seems to be discharged. For assisting, nevertheless, the apparatus to which it is connected within the scope of this described example, the assembly 25 has a large capacity and the assembly 26 a small capacity, it is therefore supposed that only assembly 26 is discharged.
When the signal S is active, a switch assembly formed by switch circuits s0, s1 and s2 creates a back-up line 36 for sending the voltage of the assembly 25 to access 15-16. Although this voltage is less than the voltage provided, the receiver circuit of the electronic part 20 can still operate, but the transmitter circuit will no longer operate. This back-up line 36
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Halajian Dicran
Paladini Albert W.
U.S. Philips Corporation
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