Magnetic resonance coupling working at megahertz (MHz) is widely considered as a promising technology for the mid-range transfer of medium amount power. It known that soft-switching-based Class E rectifiers are suitable high-frequency rectification, and thus potentially improve overall efficiency MHz wireless power (WPT) systems. This paper reports new results on optimized parameter design WPT system based analytical derivation current-driven rectifier. The input impedance rectifier...

This paper develops a 6.78 MHz multiple-receiver wireless power transfer system driven by Class E amplifier. Constant output voltage is achieved for each receiver with optimized overall efficiency. A novel one-receiver model built to analyze the power-efficiency characteristics. The loads and input are then designed as two control variables. Through tuning loads, constant independent controllers at side. Then, efficiency transmitter Finally, theoretical analysis scheme validated using...

The high-efficiency current-mode (CM) and voltagemode (VM) Class-E power amplifiers (PAs) for MHz wireless transfer (WPT) systems are first proposed in this paper the design methodology them is presented. CM/VM PA able to deliver increasing/decreasing with increasing load efficiency maintains high even when varies a wide range. certain operation mode realized by introducing an impedance transformation network fixed components. efficiency, output power, circuit tolerance, robustness all taken...

This paper proposes a new battery cell voltage equalization approach using multiple-receiver wireless power transfer (WPT) working at megahertz (MHz). Compared with existing multiwinding transformer, the MHz WPT system is advantageous in terms of saved weight and space, ease implementation, improved safety. In this paper, unique operating principle WPT-based first explained, through which currents are naturally determined by distribution. The also analytically derived. facilitates discussion...

In this paper, the loading effect of a Class E power amplifier (PA) driven 6.78 megahertz (MHz) wireless transfer (WPT) system is analyzed at both circuit and levels. A buck converter introduced controlled to track an optimal equivalent load that maximizes efficiency under uncertainties in relative position coils final load. For control, additional degree freedom provided by adding ultracapacitor bank. control strategy proposed maximum charge/discharge bank through on/off PA. Thus, high can...

Wireless power transfer (WPT) working at megahertz (MHz) is now being widely considered a promising candidate for the midrange of medium amount power. Efforts have been made to build high-efficiency MHz WPT systems via both component- and system-level approaches. However, so far there few discussions on high-frequency rectifier applications. The soft-switching-based rectifiers, such as Class E are one candidates rectification. This paper investigates application full-wave current-driven...

This article develops explicit design of an impedance matching network (IMN) to enhance the robustness megahertz (MHz) wireless power transfer (WPT) systems against variations in their final load and coil coupling. Unlike existing trial-and-error-based solutions, analytical derivations are conducted calculate parameters a two-port T- or <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\bf...

Class <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$E^2$</tex-math></inline-formula> DC–DC converter composed of notation="LaTeX">$E$</tex-math></inline-formula> power amplifier (PA) and rectifier is a promising candidate for MHz wireless transfer. It soft-switching based able to achieve high efficiency at frequency. However, the implemented through traditional static design sensitive variations operation...

Wireless power transfer (WPT) working at megahertz (MHz) is widely considered a promising technology for midrange and low-power applications. A Class E <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> dc-dc converter composed of amplifier (PA) rectifier. It attractive applications in MHz WPT due to the soft-switching properties both PA Using existing design, can only achieve optimal performance such as high efficiency under fixed...

Wireless power transfer (WPT) via near-field magnetic coupling is an enabling technology for many applications. A few WPT standards are under development with frequencies ranging from kilohertz (kHz) to megahertz (MHz). Operation in kHz offers a higher rating and that MHz smaller size. This paper presents dual-band architecture novel transmitter receiver topologies can achieve high performance at both 100 13.56 low component count decoupled delivery different frequencies. On the side, we...

In this paper, we design a linear time-invariant two-input-two-output controller for the permanent magnet synchronous motor (PMSM). First, nonlinear system of PMSM is approximated using with structured uncertainties according to geometric structures PMSM. We then standard μ-synthesis robust control method. The main contribution paper that recognize can be reduced apply mature modern theory, without referring classical PID control, thus largely reducing effort. newly designed not only easy...

Wireless power transfer (WPT) working at several megahertz (MHz), 6.78 or 13.56 MHz, is widely considered to be a promising candidate for charging electronic devices. The so-called Class E <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> converters combining the soft-switching-based amplifier (PA) and rectifier are known suitable high-frequency applications with improved efficiency. However, of batteries usually need follow specific...

Traditional Class-E circuit features fewer components, high reliability, and soft switching. However, due to the unidirectional excitation, application of such a topology is limited, i.e., usually used in low-power applications. To relieve this issue, article proposes switched-capacitor-based circuit, extend operating power range circuit. With proposed new both constant current (CC) voltage (CV) output modes can be achieved by switching branch once without changing frequency or compensation...

This article proposes a comprehensive approach to address the challenges posed by simultaneously varying dc load and coil coupling in drone wireless charging, which inevitably occur during battery charging landing positioning. The combination of two new designs, quasi-elliptic transmitting (Tx) "belt" receiving (Rx) coil, enables adequate power transfer at megahertz (e.g., 6.78 MHz) over large circular area. on-board Rx (5.8 g) especially helps achieve lightweight minimize air resistance. A...

This paper proposes and implements autonomous control of a multiple-receiver wireless charging system. The problem is challenging due to the decentralized nature system, possible changing numbers types energy storage devices as loads receivers, complexity in power distribution mechanism. game-theory-based developed that fully respects unique characteristics transmitter (i.e., charger) receivers. preferences individual are first quantified using utility functions. Then, formulated generalized...

For multiple-receiver wireless power transfer (WPT), a scalable solution is desired that functions with changing number of receivers. Meanwhile, challenges lie in differences load characteristics, level, and cross coupling between the This article employs Class E2 dc-dc converter topology for WPT systems working at megahertz (MHz). The shunt capacitor capacitances E rectifiers magnitude constant output current current-mode amplifier are chosen as design parameters aiming decoupling received...

This article presents a dual frequency hierarchical modular multilayer balancer (MMB) architecture capable of performing electrochemical impedance spectroscopy (EIS) and self-heating for battery systems. The MMB comprises two layers balancing circuits: cell-level operates at few MHz with miniaturized size; string-level hundred kHz to achieve high efficiency rapid balancing. By reusing the circuitry, can perform EIS, self-heating. key contributions this include: first, circuit topology...

Wireless power transfer (WPT) systems operating at several MHz are known to be advantageous for realizing high spatial freedom of and compact lightweight designs. The combined use multiple transmitting (Tx) coils magnetic field shaping is expected further increase the freedom. This article studies an extendable planar Tx-coil array architecture. architecture provides new conveniences WPT efficiently charge devices in 3D space. Time-domain phasor-domain modelings carried out turn analyze...

Current power supply networks across the world are mostly based on three-phase electrical systems as an efficient and economical way for generation, transmission distribution of electricity. Now, many electrically driven devices relying direct current or single-phase alternating that complicates utilization by requiring additional elements costly switching mechanisms in circuits. For example, light-emitting devices, which now widely used displays, solid-state lighting etc. typically operate...

The single-switch topologies, e.g., the Class E topology, have advantages of low component count, no shoot-through problem, simple driving circuit, which make it more suitable for high frequency low/medium-power wireless power transfer (WPT) applications. However, due to switch voltage stress, narrow soft switching range, bulky input choke, or ac inductor, its delivery capability and applications are limited. In order solve these problems, this article proposed a novel active clamp topology...

Wireless power transfer (WPT) systems working at several megahertz (MHz) are widely considered as a promising solution for mid-range of medium amount power. The soft-switching-based Class E amplifier (PA) and rectifier known to be suitable high-frequency applications, which may potentially improve the performance MHz WPT systems. Meanwhile, efficiency output PA sensitive its loading condition, particularly when there is variation in relative position coupling coils, namely changed mutual...

At present, mobile energy storage technology (mainly batteries) is still far from satisfactory. For instance, the specific of gasoline (~12,432 Wh/kg) hundreds times that a mass-market battery (20-200 . Quite unlike computational power predicted by Moore's law, improvement in density much slower, basically following linear trend. In addition to density, reliability, weight, and cost are also major impediments widespread use electronic devices (e.g., cellphones, wearable devices, medical...