Direct-Axis Component-Based Demodulation for Variable Zero-Vector Position Modulated DC-AC Talkative Power Conversion

Talkative Power Conversion (TPC) can achieve simultaneous power and data transmission without installing any or few additional transmitter hardware by embedding information into switching ripples. TPC has been the focus of many studies in DC-DC converters, but DC-AC converters have attracted less attention. Zero-vectors have been proposed recently to embed data by modulating either zero-vector width or position. However, the bit rate is limited due to time-frequency uncertainty principle in the Fast Fourier Transform (FFT) analysis. This study proposes a novel direct-axis component-based demodulation technique for DC-AC variable zero-vector position modulation-based TPC. The efficacy of this demodulation is evidenced by its ability to attain a higher bit rate and a simplified receiver structure by eliminating the fast Fourier transform, lowpass filters and coherent carriers. Simulation and experimental results confirm the feasibility of the proposed direct-axis component-based demodulation method. This technique could improve remote monitoring and adaptive decision-making for optimal energy management.