Low cost wireless (resistive) sensor based on impedance coupling/modulation using MRC

Abstract

A system for transmitting data signals from a sensor on a vehicle through magnetic resonance coupling (MRC). The system includes a control circuit having a base coil, a variable current source, a variable capacitor and a control load, where the variable current source and the capacitor are tuned to provide a predetermined AC current to the base coil so as to generate an oscillating magnetic field at a predetermined frequency. The system also includes a receiver circuit associated with the sensor, where the receiver circuit includes a receiver coil, a tuning capacitor and a variable resistive load. The receiver coil is tuned and magnetically coupled to the base coil at the predetermined frequency. A change in the variable resistive load in the receiver circuit in response to a sensor measurement causes a change in the voltage across the control load that gives an indication of the sensor measurement.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of the priority date of US Provisional Patent Application Serial No. 61 / 945,730, filed February 27, 2014, entitled "Low Cost Wireless (Resistive) Sensor Based on Impedance Coupling / Modulation Using MRC." technical field [0003] The present invention relates generally to systems and methods for transmitting data signals from sensors via magnetic resonance coupling (MRC), and more particularly to systems and methods for transmitting data signals from sensors on a vehicle via MRC, wherein, with A change in a variable complex impedance load in a receiver circuit associated with the sensor causes a change in magnetic coupling between a receiver coil in the receiver circuit and a base coil in the control circuit, which changes the magnetic coupling Change the control load in the control circuit. Background technique [0004] Modern vehicles employ many sensors, actuators, controllers, su...

AI Technical Summary

Problems solved by technology

However, the transmission of wireless signals also suffers from a number of drawbacks, including: interference with signals from other vehicles; potential interference with signals from user devices brought into the vehicle; unwanted radiation within the vehicle's passenger compartment ; and fading problems, which will lead to loss of signal, which requires greater transmission power and high power consumption

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