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Physical property sensor with active electronic circuit and wireless power and data transmission

  • US 9,653,926 B2
  • Filed: 05/21/2015
  • Issued: 05/16/2017
  • Est. Priority Date: 07/20/2008
  • Status: Active Grant
First Claim
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1. A wireless sensor, comprising:

  • a power harvesting unit configured to receive an external energizing magnetic field generated by an external interrogator and store the energy generated thereby;

    a transducing A-to-D converter unit comprising a passive electrical transducer configured to respond to variations in a physical property and a converter configured to measure a characteristic value of the passive electrical transducer and provide a digital signal that is indicative of the measured characteristic value;

    a microcontroller unit electrically coupled to the power harvesting unit and the transducing A-to-D converter unit, wherein the microcontroller unit is configured to receive the digital signal from the transducing A-to-D converter unit; and

    a transmitting coil configured to receive the digital signal from the microcontroller unit and transmit the digital signal to the external interrogator;

    wherein, upon receiving a start signal, the transducing A-to-D converter unit charges a current through the passive electrical transducer until a reference voltage is reached and, upon reaching the reference voltage, the microcontroller unit receives the digital signal.

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