A High-Efficiency ASK-Modulated Class-E Power and Data Transmitter for Medical Implants

In this article, we propose an amplitude-shift keying (ASK) modulation technique for Class-E power transmitters used in the inductive power and data transfer links. The proposed modulation circuit consists of a capacitor and a transistor, which switch the load network of the Class-E transmitter betw...

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Veröffentlicht in:IEEE transactions on power electronics 2022-01, Vol.37 (1), p.1090-1101
Hauptverfasser: Ahmadi, Mohammad Mahdi, Pezeshkpour, Shirin, Kabirkhoo, Zahra
Format: Artikel
Sprache:eng
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Zusammenfassung:In this article, we propose an amplitude-shift keying (ASK) modulation technique for Class-E power transmitters used in the inductive power and data transfer links. The proposed modulation circuit consists of a capacitor and a transistor, which switch the load network of the Class-E transmitter between two states; in one state, the drain waveform of the Class-E transistor satisfies both zero-voltage switching (ZVS) and zero-voltage-derivative switching conditions, while in the other one, the waveform approximately satisfies the ZVS condition. Therefore, at both states, the dc-to-ac power conversion efficiency is high, but the transmitted power is different, which allows the implementation of ASK data modulation in the transmitter. We also present an analytical procedure to design the circuit for the desired output power and data modulation index (MI). We have verified the design procedure in both simulation and measurement. The implemented inductive link consists of a 2.4-\muH transmitter coil and a 1.1-\muH receiver coil, separated by a 10-mm air gap. With a carrier frequency of 10 MHz, the power transfer efficiency and the power delivered to load were measured to be 64.6% and 35 mW, respectively. With MI = 10%, the bit error rate for the data rates of 1 and 2 Mb/s was measured to be less than 10 -8 and 10 -6 , respectively.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3092829