Article
Engineering, Electrical & Electronic
Orpita Saha, Erik Andersen, Shad Roundy
Summary: The use of magnetoelectric (ME) devices in wireless power transfer (WPT) offers advantages in terms of smaller size and lower operating frequencies compared to traditional coils. This paper presents a solution to the challenge of supplying a large DC bias to ME devices using self-biased structures with magnetization grading effect. The experimental results demonstrate the feasibility of generating power without a DC field bias, making these laminates attractive for powering biomedical implants.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Review
Instruments & Instrumentation
Orpita Saha, Binh Duc Truong, Shad Roundy
Summary: This literature review discusses the application of magnetoelectric (ME) structures in wireless power transfer (WPT) systems. ME structures have been found to have better performance in small scale devices compared to traditional receiving coils, and can effectively wirelessly power various sensors and biomedical implants. Additionally, a power figure of merit is proposed for evaluating recent ME WPT research.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Reza Sedehi, David Budgett, Jincheng Jiang, Xia Ziyi, Xin Dai, Aiguo Patrick Hu, Daniel McCormick
Summary: This article presents a capacitively coupled conductive power transfer method for deeply implanted biomedical devices, which ensures safe power transfer into the body with minimal implant volume. The proposed method has been validated through experimental measurements, demonstrating its effectiveness and safety.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Instruments & Instrumentation
Ali Koteiche, Alexis Brenes, Kevin Malleron, Gerard Sou
Summary: This study presents an experimentally validated system-level model of a magnetoelectric transducer, along with a general methodology for characterizing similar transducers in the future. The authors find that nonlinear mechanical losses are the main source of power dissipation, leading to a maximum transferable power up to 61% lower than expected based on linear characterization. Applying a grey-box model of dependencies between transducer characteristics and operating point helps to understand the complex nonlinear behavior observed in the system.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Biomedical
Sujay Hosur, Rammohan Sriramdas, Sumanta Kumar Karan, Na Liu, Shashank Priya, Mehdi Kiani
Summary: ME transducers, composed of layered magnetostrictive and piezoelectric materials, are more efficient than inductive coils in converting low-frequency magnetic fields into electric fields. This paper studies the impact of different design parameters on the performance of the ME transducer in wireless power transfer. Through modeling and measurements, the effects of size, DC bias magnetic field, loading, and operation frequency on resonance frequency and received power of the ME transducer are determined.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2021)
Article
Engineering, Biomedical
Sayemul Islam, Rebecca C. Huggins, Abdulaziz N. A. E. Almeseri, Michael Domic, Seung Hyun Song, Brian D. Polizzotti, Albert Kim
Summary: This paper presents a totally implantable oxygen generator (TIOG) for localized and controlled oxygen delivery. The TIOG system can be remotely operated and delivers oxygen through electrolysis with a precisely controlled electrical signal. In vitro experiments demonstrate that the TIOG can deliver oxygen at a specific rate and suppress chlorine generation. The longevity of the TIOG system enables long-term ambulatory oxygen therapy.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Javad Karimi, Catherine Dehollain, Alexandre Schmid
Summary: Effective power management is essential for wirelessly powered implants to have a long operational lifetime, ensuring optimized power and preventing damage. This brief introduces a power feedback control unit for wirelessly powered biomedical devices, including an implanted voltage level detector and limiter. The feedback control bits can be transmitted as uplink data or used autonomously to prevent overvoltage. The system is implemented in a 180 nm CMOS process, consuming 144 μW at a supply voltage of 1.8 V and a chip area of 0.02255 mm(2).
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Acoustics
Braeden C. Benedict, Mohammad Meraj Ghanbari, Rikky Muller
Summary: This article presents the design of a custom planar phased array ultrasound (US) system capable of steering and focusing US power within a 3-D volume. The use of time reversal as a computationally simple beamforming technique is proposed and compared with other techniques in terms of energy transfer efficiency. The system is also demonstrated to enable simultaneous power delivery to multiple implants.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Engineering, Electrical & Electronic
Binh Duc Truong
Summary: This paper presents a general framework for maximizing power transmission to a load resistance in a magnetoelectric wireless power transfer system, considering volume constraints. The authors derive an analytical solution to the power optimization problem under different conditions and investigate the relationships between output power and operating frequency. The roles of magneto-elastic transduction factor and resonator figure of merit are discussed, and examples with specific system parameters are provided to validate the theoretical analysis.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Instruments & Instrumentation
Ahmed Allam, Karim Sabra, Alper Erturk
Summary: This study achieves simultaneous power harvesting and backscatter communication through frequency multiplexing. A high sensitivity and high bandwidth piezoelectric transducer is designed and a technique to separate power and data into different frequency bands is developed. These technologies can extend the range and bandwidth of ultrasonically powered devices.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Amjad Iqbal, Muath Al-Hasan, Ismail Ben Mabrouk, Abdul Basir, Mourad Nedil, Hyoungsuk Yoo
Summary: This article introduces an efficient WPTS for multipurpose biomedical implants, which includes an implantable antenna, rectifier, and WPT Tx. The system can transfer data and recharge devices simultaneously. The components operate at 1470 MHz, with the self-diplexing antenna also working at 915 MHz.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Usama Anwar, Zhaoyi Liu, Dejan Markovici
Summary: This article presents an analysis and design of a high-efficiency, 6.78-MHz burst-mode controlled inductive wireless power transfer system without back-channel communication. The power flow between the transmitter and receiver is controlled through load modulation. By utilizing the inherent load modulation properties of the system, the need for traditional back-channel communication is eliminated. Experiments show that the quality factor of the transmitter can be detected to eliminate the back-channel communication. The proposed system only requires an additional switch in the receiver power stage to regulate the output voltage.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Taejun Lim, Yongshik Lee
Summary: A stacked-coil technology has been demonstrated to address lateral misalignment in nonradiative wireless power transfer systems. The system consists of multiple layers of coils with various sizes, allowing for the best transfer efficiency coil pair to be switched on depending on the misalignment. Experimental results show that the transfer efficiency can be maintained at high levels under different misalignment conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Instruments & Instrumentation
Erik Andersen, Shad Roundy, Binh Duc Truong
Summary: The study investigates the frequency dependence of the maximum output power and efficiency of two wireless power transfer systems, resonant inductive coupling (RIC) and magnetoelectric (ME). The results show that in the weak-coupling regime, the power optimization and efficiency maximization problems are equivalent and yield the same optimal load and frequency, with both topologies exhibiting similar properties.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Binh Duc Truong, Cuong Phu Le, Shad Roundy
Summary: The aim of this work is to study the performance of a hybrid energy harvesting system with piezoelectric and electromagnetic transducers. The study shows that a single-mechanism generator with negligible electrical losses can reach the theoretical power limit, making hybrid systems unnecessary. However, considering electrically parasitic losses, effective figures of merit are introduced to analyze the maximum output power of single-transducer and hybrid systems. It is found that a hybrid system is not beneficial if the effective figures of merit exceed a threshold of M* approximately 2.17. The study also reveals the conditions in which a resonant hybrid harvester system can outperform a single energy conversion system.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Binh Duc Truong, Shad Roundy
SMART MATERIALS AND STRUCTURES
(2019)
Article
Engineering, Electrical & Electronic
Hamid Basaeri, Yuechuan Yu, Darrin Young, Shad Roundy
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2019)
Editorial Material
Green & Sustainable Science & Technology
Shad Roundy, Miso Kim, Gil-Yong Lee, Sung-Hoon Ahn
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Yuechuan Yu, Tram Nguyen, Prashant Tathireddy, Shad Roundy, Darrin J. Young
IEEE SENSORS JOURNAL
(2020)
Article
Engineering, Biomedical
Miao Meng, Dixiong Wang, Binh Duc Truong, Susan Trolier-McKinstry, Shad Roundy, Mehdi Kiani
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2019)
Article
Physics, Applied
Robert Rantz, Shad Roundy
PHYSICAL REVIEW APPLIED
(2020)
Article
Engineering, Electrical & Electronic
Erik Andersen, Curtis Casados, Binh Duc Truong, Shad Roundy
Summary: This article investigates the optimal design of a transmit coil for a wireless power transfer system for biomedical implants with the goal of maximizing the magnetic flux density at the location of the implant. The study presents equations for determining the design parameters of an optimal solenoid transmitter subject to constraints on either transmitter size or electric current. Experimental validation of the mathematical model and a case study illustrating optimal design rules are also provided.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2021)
Article
Engineering, Electrical & Electronic
Jacob L. B. Aman, Jake J. Abbott, Shad Roundy
Summary: This article applies dimensional analysis to optimize radial magnetic torque couplers. The goal is to find a design that maximizes torque potential within a given package size. The article considers two types of torque couplers: permanent-magnet torque couplers and variable-reluctance torque couplers. By using the Buckingham Pi theorem, the minimal set of dimensionless parameters for design optimization is identified. 2-D and 3-D finite-element analysis is then used to find and characterize the optimal designs.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Review
Instruments & Instrumentation
Orpita Saha, Binh Duc Truong, Shad Roundy
Summary: This literature review discusses the application of magnetoelectric (ME) structures in wireless power transfer (WPT) systems. ME structures have been found to have better performance in small scale devices compared to traditional receiving coils, and can effectively wirelessly power various sensors and biomedical implants. Additionally, a power figure of merit is proposed for evaluating recent ME WPT research.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Medicine, Research & Experimental
Turner Palombo, Andrea Campos, Suzanne D. Vernon, Shad Roundy
JOURNAL OF TRANSLATIONAL MEDICINE
(2020)
Proceedings Paper
Energy & Fuels
Erik Andersen, Binh Duc Truong, Shad Roundy
2019 IEEE MTT-S WIRELESS POWER TRANSFER CONFERENCE (WPTC) / IEEE PELS WORKSHOP ON EMERGING TECHNOLOGIES: WIRELESS POWER (WOW) / WIRELESS POWER WEEK (WPW 2019)
(2019)
Proceedings Paper
Energy & Fuels
Veena Misra, Alper Bozkurt, Benton H. Calhoun, Suman Datta, Michael Dickey, Mehdi Kiani, John Lach, Bongmook Lee, Jesse Jur, Omer Oralkan, Mehmet Ozturk, Ram Rajagopalan, Shad Roundy, Jason Strohmaier, Susan Trolier-McKinstry, Daryoosh Vashaee, David Wentzloff, Doug Werner
18TH INTERNATIONAL CONFERENCE ON MICRO AND NANOTECHNOLOGY FOR POWER GENERATION AND ENERGY CONVERSION APPLICATIONS
(2019)
Proceedings Paper
Energy & Fuels
Binh Duc Truong, Dixiong Wang, Tiancheng Xue, Susan Trolier-McKinstry, Shad Roundy
18TH INTERNATIONAL CONFERENCE ON MICRO AND NANOTECHNOLOGY FOR POWER GENERATION AND ENERGY CONVERSION APPLICATIONS
(2019)
Proceedings Paper
Energy & Fuels
M. A. Halim, T. Xue, R. Rantz, Q. Zhang, L. Gu, K. Yang, S. Roundy
18TH INTERNATIONAL CONFERENCE ON MICRO AND NANOTECHNOLOGY FOR POWER GENERATION AND ENERGY CONVERSION APPLICATIONS
(2019)