Back to results
US 5,859,873 AGranted
Method and arrangement for non-contact transmission of measured values
AssigneeU.S. Philips Corporation
InventorSiegfried Ritter
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeU.S. Philips Corporation
InventorSiegfried Ritter
Estimating the term…
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.
A method for non-contact transmission of measured values of at least one active measuring unit comprising:
An arrangement for non-contact transmission of measured values of at least one active measuring unit, comprising for each active measuring unit at least one sensor and one evaluation circuit for converting the measured values of the sensor into measured data, a power source and a transceiver for transmitting measured data and for receiving signals, at least one base station which comprises a control circuit and a transceiver for transmitting signals to the transceiver of the active measuring unit and for receiving measured data from the active measuring unit, the transceiver of the measuring unit and of the base station being coupled at times and the active measuring unit transmitting measured data only when the signal is received from the base station, characterized in that the power source of the active measuring unit is connected to a supply voltage terminal of only the evaluation circuit and in that the transmitter of the active measuring unit transmits the measured data to the base station by using only the power received from the base station.
A measuring unit for non-contact transmission of measured values of the measuring unit to a base station, comprising:
Dependencies are inferred from the claim text.