Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1993-03-30
1995-02-28
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327530, 327510, H03L 100, H03L 500
Patent
active
053941055
ABSTRACT:
In integrated storage circuits which receive energy only via a coil in a contactless manner and which also execute the data exchange, the integrated storage circuit loads the coil to a greater extent dependent upon the data read. It is possible to detect this load variation in the device feeding the coil. Detection is more reliable as the load variation is greater. However in the case of a high coil load, the voltage across the coil decreases to such an extent that, after rectification, it is no longer sufficient to reliably energize. The supply voltage for the storage circuit is generated by means of a voltage increase circuit during the increased load. The voltage increase circuit is controlled by the data. If a voltage comparator compares the voltage generated by the voltage increase circuit with a reference voltage and controls the load device in dependence thereon, a control circuit is obtained which maintains a minimum voltage across the coil, and hence at the output of the voltage increase circuit, ever during increased loading of the coil by the load device.
REFERENCES:
patent: 4492926 (1985-01-01), Kusakabe et al.
patent: 5039887 (1991-08-01), Brahms et al.
Abraham Fetsum
Franzblau Bernard
Sikes William L.
U.S. Philips Corporation
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