Simultaneous wireless power transfer and data communication using synchronous pulse-controlled load modulation

Abstract

Wireless Power Transfer (WPT) and wireless data communication are both important problems of research with various applications, especially in medicine. However, these two problems are usually studied separately. In this work, we present a joint study of both problems. Most medical electronic devices, such as smart implants, must have both a power supply to allow continuous operation and a communication link to pass information. Traditionally, separate wireless channels for power transfer and communication are utilized, which complicate the system structure, increase power consumption and make device miniaturization difficult. A more effective approach is to use a single wireless link with both functions of delivering power and passing information. We present a design of such a wireless link in which power and data travel in opposite directions. In order to aggressively miniaturize the implant and reduce power consumption, we eliminate the traditional multi-bit Analog-to-Digital Converter (ADC), digital memory and data transmission circuits all together. Instead, we use a pulse stream, which is obtained from the original biological signal, by a sigma-delta converter and an edge detector, to alter the load properties of the WPT channel. The resulting WPT signal is synchronized with the load changes therefore requiring no memory elements to record inter-pulse intervals. We take advantage of the high sensitivity of the resonant WPT to the load change, and the system dynamic response is used to transfer each pulse. The transient time of the WPT system is analyzed using the coupling mode theory (CMT). Our experimental results show that the memoryless approach works well for both power delivery and data transmission, providing a new wireless platform for the design of future miniaturized medical implants.

Evaluation of RF Wireless Power Transfer for Low-Power Aircraft Sensors

“…In this work, the wireless charging has been further refined through a tracking loop, which adjusts the RF to DC rectifiers threshold to achieve maximum efficiency. Additionally, the coexistence of wireless communications has been studied in terms of minimizing interference [8] as well as using a single link to perform the two functions [9]. A comprehensive overview of the history and state of the art of remote powering is given in [10].…”

High-Bandwidth-Utilization Wireless Power and Information Transmission Based on DDPSK Modulation

“…Compared with FSK and FDM methods, the PSK method is more suitable for high-speed communication applications. Regarding the load shift keying (LSK) method, its principle is to change the equivalent resistance on pick-up side [32] and even to short resonant circuit [23] to achieve backward communication. Compared with LSK method, the DDPSK method is to shift the working mode of the S-BAR so that the pick-up side is in an inductive or capacitive operating state; meanwhile, the equivalent resistance remains unchanged.…”

Wireless power transfer using multiple-transmitters for high stability for position

“…Recently, many papers about WPT have been published, and various products have been examining and commercializing. For example, studies such as examination of design of coils [9][10][11][12] and comparison of efficiency by change of applied voltage waveform [13,14], are investigating. As products, WPT system is applied for power supply on various fields, for instance mobile devices and IoT [15], vehicles traveling on the road [16][17][18][19], and micro implant devices [20][21][22].…”