High-Data-Frequency-Ratio Information Transmission Method for Fast Dynamic Response SWPIT Systems Based on DASK Modulation

Integration of power and information transmission is promising for simultaneous wireless power and information transmission (SWPIT). This article presents a differential amplitude-shift keying (DASK) modulation-based high-data-frequency-ratio information transmission method for fast dynamic response integrated SWPIT systems. Modeling and analyses of the phase-shifting modulation of power converters indicate the potential of the DASK modulation for information transmission. Operation principle of the proposed modulation is established to maintain the stability of power transmission based on the modeling. Modulator, demodulator, and communication protocol are further designed. Using the dynamic analytical model of the transmission channel, the active intersymbol interference (ISI) elimination characteristics are analyzed. Due to the ISI elimination, a high-data-frequency-ratio and fast dynamic response SWPIT is realized. Interactions between power and information transmissions are evaluated, and the results show anti-interference performances. Finally, an experimental prototype rated at 200 W is built to verify the effectiveness of the method, and the data-frequency ratio reaches 0.5 bit/Hz. Complexity, cost, and response period of the method are reduced significantly, and it can be extended to other applications universally.