Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

Abstract

Recently, stationary wireless power transfer (WPT) has been widely adopted in commercial devices. However, the current WPT configuration is limited in its operational area and susceptible to operating condition changes, impeding its applications for dynamic environments. To overcome the limitations, we propose a WPT system with laterally aligned neutral elements in parity-time (PT) symmetry, which can widen the operational area with the number of neutrals N . Compared to the conventional multiple-input–single-output WPT, the dimension of system complexity is substantially reduced from R × C N to R N+ 1 because the neutral amplitudes are simply controlled by coupling capacitors. The operational frequency is automatically adjusted to a real eigenvalue of the PT-symmetric system to achieve high voltage gain and efficiency, making the system robust. The performance of the system calculated by the coupled-mode theory was experimentally verified with rigid and flexible types of receivers, confirming its potential in both industrial and biomedical electronics.

Wirelessly powered motor operation in dynamic scenarios using non-Hermitian parity-time symmetry

“…The operation at the low eigen frequency comes from low damping ratio, which is consistent with Ref. 43. Therefore, we have confirmed that the operation frequency is tuned as we designed.…”

Materials-Driven Soft Wearable Bioelectronics for Connected Healthcare

“…The analysis showed that the proposed system consistently and reliably provides wireless power across a wider range of both distal and lateral displacements when compared to the conventional system (Figure 32e, f). 674 In contrast, far-field technologies like Bluetooth, Wi-Fi, and 5G offer long-range, high-data rate transmission but require power at the sensor. This could be achieved by an integrated Bluetooth Low Energy (BLE) module (Figure 32g).…”

“…The suitability of this proposed system for biological applications and its durability were evaluated using porcine tissue in an ex vivo setting, and the results were compared to those obtained with conventional WPT systems. The analysis showed that the proposed system consistently and reliably provides wireless power across a wider range of both distal and lateral displacements when compared to the conventional system (Figure e, f) …”

“…To address this challenge, an advanced WPT system was introduced, featuring laterally aligned neutral components designed with parity−time symmetry. 674 This innovative system demonstrates the capacity to achieve high voltage gain and efficiency while significantly reducing overall system complexity. This is accomplished by regulating the amplitudes of neutral elements through coupling capacitors (Figure 32d).…”

“…Traditional WPT setups have limitations when it comes to their operational range and their ability to adapt to changing environmental conditions, which hinders their use in dynamic biological settings. To address this challenge, an advanced WPT system was introduced, featuring laterally aligned neutral components designed with parity–time symmetry . This innovative system demonstrates the capacity to achieve high voltage gain and efficiency while significantly reducing overall system complexity.…”