Method and arrangement for non-contact transmission of measured values
First Claim
1. A method for non-contact transmission of measured values of at least one active measuring unit comprising:
- deriving the measured values in the active measuring unit by means of a sensor and converting same into measured data in an evaluation circuit, using a local power source only for operating the evaluation circuit, transmitting the measured data to a base station when said base station is brought into spatial proximity to the measuring unit and transmits a signal to the measuring unit, and wherein the measured data are transmitted from the active measuring unit to the base station using only the power contained in the signal which is transmitted from the base station to the active measuring unit.
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Accused Products
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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Citations
18 Claims
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1. A method for non-contact transmission of measured values of at least one active measuring unit comprising:
- deriving the measured values in the active measuring unit by means of a sensor and converting same into measured data in an evaluation circuit, using a local power source only for operating the evaluation circuit, transmitting the measured data to a base station when said base station is brought into spatial proximity to the measuring unit and transmits a signal to the measuring unit, and wherein the measured data are transmitted from the active measuring unit to the base station using only the power contained in the signal which is transmitted from the base station to the active measuring unit.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
- 8. 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.
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12. A measuring unit for non-contact transmission of measured values of the measuring unit to a base station, comprising:
- a sensor for producing measured values, an active power source, an evaluation circuit for converting the measured values into measured data, a transceiver for transmitting measured data and for receiving signals, characterized in that the power source is coupled only to a supply voltage terminal of the evaluation circuit and in that the transceiver transmits measured data only on reception of a signal and by using only the power received from said signal.
- View Dependent Claims (13, 14, 15, 16, 17, 18)
Specification