WIRELESS POWER TRANSFER
WIRELESS POWER TRANSFER
1.A High-Efficiency 24 GHz Rectenna Development towards Millimeter-Wave Energy Harvesting and Wireless Power Transmission
A High-Efficiency 24 GHz Rectenna Development towards Millimeter-Wave Energy Harvesting and Wireless Power Transmission
This work addresses design and implementation issues of a 24 GHz rectenna, which is developed to demonstrate the feasibility of wireless power harvesting and transmission (WPT) techniques towards millimeter-wave regime. The proposed structure includes a compact circularly polarized substrate integrated waveguide (SIW) cavity-backed antenna array integrated with a self-biased rectifier using commercial Schottky diodes. The antenna and the rectifier are individually designed, optimized, fabricated and measured. Then they are integrated into one circuit in order to validate the studied rectenna architecture. The maximum measured conversion efficiency and DC voltage are respectively equal to 24% and 0.6 V for an input power density of 10 mW/cm2.
2.A Real-time Electrically Controlled Active Matching Circuit Utilizing Genetic Algorithms for Wireless Power Transfer to Biomedical Implants
A Real-time Electrically Controlled Active Matching Circuit Utilizing Genetic Algorithms for Wireless Power Transfer to Biomedical Implants
This paper discusses the feasibility of a real-time active matching circuit (MC) for wireless power transfer applications, especially for biomedical systems. One prototype of low-cost real-time automatic MC, utilizing a variable circuit topology, including discrete passives and p-i-n diodes, has been implemented and the principle has been verified by measurements. One genetic algorithm was introduced to optimize the design over a wide range of impedances to match. As a result of preliminary operation verification tests, the proposed real-time MC system results in improving the transfer coefficient in the range of 10–16-cm coil separation distance a maximum of 3.2 dB automatically in about 64 ms. Similar performance improvement results were observed in additional tests under misaligned conditions, as well as for nonsymmetrical Tx–Rx coil configurations further verifying the potential applicability of the proposed system to practical biomedical devices.
3.Wireless Power Transmission for Multiple Devices
Wireless Power Transmission for Multiple Devices
Wireless power transmission concept has being revolutionary emerging against the conventional charging methods of consumer electronics. In this paper, we present the concept of wireless power transmission for multiple devices. Simultaneous wireless power transmission via resonant inductive coupling is experimentally demonstrated for a system with single transmitter and two receivers. Resonance between source and load is achieved with lumped capacitors connecting the coils. The circuit design is developed to describe a system with a single receiver, and extended to describe the system with two receivers.