Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2000-10-16
2001-10-09
Berhane, Adolf Deneke (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C235S492000
Reexamination Certificate
active
06301138
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a data carrier as defined in the opening part of claim
1
.
The invention further relates to an integrated circuit as defined in the opening part of claim
5
.
Such a data carrier and such an integrated circuit have been put on the market by the applicant and are consequently known. In this respect reference may also be made to the patent document U.S. Pat. No. 5,345,231 A. In the known arrangements the effect occurs that the d.c. supply voltage collapses in the process of load modulation in certain time intervals corresponding to the activate state of the load modulation means, as a result of which the power supply in the data carrier and in its integrated circuit is impaired, which leads to a limited range of the data carrier during communication with a communication station provided for this purpose.
SUMMARY OF THE INVENTION
It is an object of the invention to preclude the afore-mentioned problems and to provide an improved data carrier of the type defined in the opening part of claim
1
and an improved integrated circuit of the type defined in the opening part of claim
5
.
According to the invention, in order to achieve the afore-mentioned object, a data carrier as defined in the opening part of claim
1
is characterized in that it has the characteristic features defined in the characterizing part of claim
1
.
According to the invention, in order to achieve the afore-mentioned object, an integrated circuit as defined in the opening part of claim
5
is characterized in that it has the characteristic features defined in the characterizing part of claim
5
.
By providing the characteristic features in accordance with the invention it is achieved in a simple manner and by simple means that in the process of load modulation the additional means keep the d.c. supply voltage at least at the level in the modulation pauses, in those time intervals in which without the provision of the characteristic features in accordance with the invention a slump in the d.c. supply voltage would occur. This always guarantees an adequate d.c. supply voltage, as a result of which always a correct power supply is assured in the data carrier and in its integrated circuit and, consequently, always a maximal range is achieved.
In a data carrier in accordance with the invention and in an integrated circuit in accordance with the invention it has proved to be very advantageous when, in addition, the characteristic features as defined in claims
2
,
3
and
6
,
7
, respectively, are provided. This results in a data carrier and an integrated circuit having reliable additional means which can be realized simply from the point of view of circuit engineering.
In a data carrier in accordance with the invention and in an integrated circuit in accordance with the invention it has proved to be very advantageous when, in addition, the characteristic features as defined in claims
4
and claim
8
, respectively, are provided. This measure has proved to be advantageous in view of a particularly simple circuit design.
The above-mentioned as well as further aspects of the invention will become apparent from the embodiments described hereinafter by way of example and will be elucidated with reference to these examples.
REFERENCES:
patent: 4737761 (1988-04-01), Dosjoub et al.
patent: 5345231 (1994-09-01), Koo et al.
patent: 5519729 (1996-05-01), Jurisch et al.
patent: 5521590 (1996-05-01), Hanaoka et al.
patent: 5767660 (1998-06-01), Schmidt
patent: 5874725 (1999-02-01), Yamaguchi
patent: 6145749 (2000-11-01), Thuringer et al.
patent: 6199763 (2001-03-01), Thuringer et al.
patent: 0899682A2 (1999-03-01), None
patent: WO9705504 (1997-02-01), None
Berhane Adolf Deneke
Piotrowski Daniel J.
U.S. Philips Corporation
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