Method and arrangement for non-contact transmission of measured values
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United States of America Patent
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Jan 12, 1999
Grant Date -
N/A
app pub date -
Dec 18, 1996
filing date -
Dec 20, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A measuring unit which is not easily accessible often has a power source which supplies power to the elements for the measuring operation, more particularly, the conversion of an analog measured signal into digital measured data, and for storage thereof, as required. These measured data of a measuring unit are transmitted to a base station without any contact being made the moment this base station is brought into the neighborhood of the measuring unit and transmits a signal. For a minimum load on the power source power from the power source is not supplied to the transmitter for the transmission of measured data from the measuring unit to the base station. Instead, a signal transmitted by the base station provides transmission power. In the measuring unit this signal provides a voltage for feeding the transmitter. Furthermore, via tuned circuits, during an inductive coupling between base station and measuring unit, an impedance is connected to the tuned circuit of the measuring unit via a switch which is controlled by the transmitted measured data. This change of impedance can then be evaluated in the base station by evaluating the current in the tuned circuit. The signal transmitted by the base station can also be used to recharge the power source in the measuring unit.
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