Abstract
This paper explores the feasibility of applying the capacitive power transfer (CPT) technology in underground data transmission applications. Based on the electrical properties of soils, the paper extends the existing CPT air coupler model into a more generalized model. The autonomous push-pull inverter is selected to power the CPT system and modified to further the data transmission range. With a designed load shift keying (LSK) circuitry, this self-oscillating inverter regards the data as a sequence of impedance changes, resulting in operation frequency drifts. A Frequency Shift Keying (FSK) demodulator is applied to capture the frequency variations and recover back to data. The proposed design has been simulated, verified, and implemented on a complete prototype. Various testings have been carried out, and the results are satisfactory.
Highlights
Smart farming and precision agriculture are drawing increasing popularity over the last several years
The operation frequency of the push-pull inverter will change automatically when the observed impedance changes. This paper utilizes this feature and designs an Frequency Shift Keying (FSK) demodulator based on Phase Lock Loop (PLL)
This paper explores the feasibility of applying capacitive power transfer technology (CPT) in an underground data transfer system
Summary
Smart farming and precision agriculture are drawing increasing popularity over the last several years. Due to the unique working principle of the push-pull inverter, the impedance change will result in an inverter operation frequency drift These frequency variations are captured by Frequency Shift Keying (FSK) circuitry on the receiving end and recovered into data. In such way, the battery life of sensors can be extensively increased as they only consume a small amount of current to drive the load switch. (i) Analyze the soil electrical properties and extend the standard CPT model to a more generalized model (ii) Build a comprehensive circuit simulation model of the push-pull inverter that incorporates the soil electrical properties (iii) Achieve underground data transfer via FSK modulation with the push-pull inverter.
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