Young-Ho Ryu

Analysis of misalignments in efficiency of mid-range magnetic resonance wireless power link

Misalignments between high-Q resonators for mid-range wireless power transfer is analyzed. Implanting a simple filament coil based mutual inductance to the well known power transfer efficiency formula, theoretical predictions have been well agreed with measurement results. Some interesting phenomena regarding the misalignments have been found and analyzed.

Optimal positioning of repeater resonator for mid-range magnetic resonance wireless power link

Magnetic resonance wireless power link including a non-coaxially aligned repeater resonator has been analyzed and designed for efficient mid-range wireless powering. Parametric study on the power transfer efficiency (PTE) for several meter distance range indoor powering has been made and optimization condition for maximum PTE have been obtained. The results are expected to be utilized for mid-range wireless powering in the presence of practical limitations of the resonator location.

A novel resonator for robust lateral-misalignment of magnetic resonance wireless power link

A novel resonator structure for lateral-misalignment of wireless power transfer is presented. The proposed resonator is composed of a concentrated coil and several small loop coils. The uniform magnetic field distributions of the proposed resonator are described. The proposed hybrid resonator improves about 30% of the relative efficiency variation for a lateral-misalignment.

Magnetic resonance wireless power transfer system for practical mid-range distance powering scenario references

Practical magnetic resonance wireless power transfer (WPT) system is presented. High-efficient power amplifier (PA) and adaptive tracking modules are combined with optimized wireless power links to propose mid-range wireless powering application scenarios in home-environments.

Inner-Field Guiding Resonator for Efficient Wireless Power Transmission in Proximity Charging Condition

An inner-field guiding resonator (IFGR) is presented for efficient wireless power transmission (WPT) using resonant inductive coupling in proximity charging condition. The IFGR is inserted into a source resonator to obtain a uniform magnetic field distribution which is the important design factor of a proximity WPT system, because it makes the system simple without an adaptive matching technology. As the location of the target resonator changes, the transmission efficiencies are simulated and measured to validate uniform- and high-transmission efficiency. To optimize the WPT system using the IFGR, the design procedure is proposed. Considering the practical WPT system with ground plane, the proximity WPT system including one or two mobile devices was designed and fabricated. The average of the total efficiency at all positions on the source resonator was measured as 82.9% (one mobile device) and 87.1% (two mobile devices), respectively. These results prove that an efficient proximity WPT system can be successfully designed using the IFGR.

Wireless powering management by analog circuitry based in-band signaling controller

Efficient wireless charging control scheme for powering a single device unit is presented. The proposed scheme uses in-band communication and analog circuits to control the clock signal lengths. Since it can generate the control data packets without MCU, it is easy to implement a one-chip of the RX parts. We have verified the performance of the in-band communication for the WPT system while a mobile device is in charging.