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A silicon carbide (SiC) class E inverter for 6 MHz mid-range inductive power transfer (IPT) has been experimentally shown to offer improvements of 13% in efficiency compared to a previous state-of-the-art silicon (Si) equivalent, whilst delivering 100 W to the load. Using newly available ultra-low gate charge half-bridge GaN modules from Texas Instruments, a custom resonant gate drive has been designed...
A novel planar resonant coil elements for the 3×3 array in multi-layer structure is proposed for the wireless power transmitter. Both simulation and measurement results reveal that in comparison with the conventional array of transmitter, the power transfer efficiency does not vary significantly when the receiver is moved along the plane parallel to the transmitter from 50mm to 80mm. The power transfer...
Magnetic resonance based wireless power transmission using a fractal loop with a three-dimensional structure is evaluated by simulation and experiment. Using a fractal shape optimized with a genetic algorithm, we develop a wireless power transmitting system that can tolerate lateral positioning deviation with a fixed matching circuit.
Power transfer efficiency of wireless power transfer (WPT) system is a primary concern to design and develop the WPT system. However, the power consumption in standby mode is rarely researched and reported in the literature. Since a number of WPT system rapidly increases, it is necessary to develop a standby power reduction technique for WPT system. This paper proposes a standby power reduction method...
An electromagnetic field leaked from WPT systems might cause a false operation of other electronic devices. We have measured and simulated it by using the WPT leakage emulator so far. In this paper, the electromagnetic field is evaluated on the assumption that several WPT systems are located in the residential house and operate simultaneously. It is shown that the simulated results coincide with the...
In this paper, a 13.56 MHz power-efficient CMOS active rectifier is proposed for implantable medical devices. The digital offset compensation technique automatically compensates the turn-off delay to minimize the reverse leakage current to improve the conversion efficiency. The simulation results show that the proposed rectifier achieves 92.9% PCE with wide input voltage range. The input operating...
Contact-less power line communication systems for ECU-to-sensor networks have been developed in order to integrate signal lines and power lines. This network uses a single unshielded twist pair (UTP) cable as a transmission line where RF supply power is superimposed on communication signal. The magnetic field resonance technique is used for coupling between the UTP cable and sensors without electrical...
A compact, magnetically coupled wireless power transfer (MC-WPT) planar Archimedean coil (PAC) geometry is presented. This PAC geometry combines conventional planar aligned and anti-aligned coils in a single Archimedean layout, resulting in a quality factor (Q) twice that of a conventional coil. The PAC WPT system demonstrates a measured power transfer efficiency (PTE) that is improved from 15% to...
A wireless power transmitting system for a traveling mobility scooter based on magnetic resonance has been developed. In this paper, an overview of the system will be presented. Large square coils are set up on the road surface where a mobility scooter with a small coil and no battery is traveling. The power source is a Class E amplifier operating at 13.56MHz with an output power of 150W. Power is...
In this paper, the uncertainty of electric properties of wireless power transfer systems due to uncertain geometric design parameters is analyzed. An electromagnetic simulation tool, based on an integral formulation, is coupled with a stochastic method that quantitatively determines the contribution of each uncertain design variable to the output uncertainty in terms of Sobol' indices. A generalized...
This paper demonstrates 1 kW power transfer to an Electric Vehicle on Electrified Roadway prototype. To gain a sufficient efficiency to drive the motor onboard, we create a high-kQ capacitive coupling scheme of Via-Wheel Power Transfer. To enhance kQ, newly developed wheel uprights play the pivotal role in effective electrical insulation of the wheels from the vehicle frame. We also develop 1 kW impedance...
We, DAIHEN Corporation, have developed a real-time power and impedance sensor that enables real-time measurement of transmitted power and coil impedance in a kW class wireless power transfer during practical power transfer. Normally, accurate power measurement is assured only for characteristic impedance in which the reflected power is zero. However, the sensor we developed enables highly accurate...
A wireless power transfer system operated at 6.78MHz for AirFuel specification is demonstrated in this paper. The system includes transceiver, receiver, magnetic resonance coil, and data communication. To monitor the transferred power, a communication path is establish by using the micro-controller, amplitude modulator/demodulator, and voltage/current sensing circuits. All of the modules are integrated...
Wireless charging system with rapid charging algorithm based on a simplified electrochemical battery model is proposed. The operational principle of the proposed scheme is verified with a 200W WPT prototype. Model based charging algorithm development for adaptive charging of battery to not only fast charge the battery but mitigate the associated deleterious thermal and degradation effect. It is shown...
The significant efficiency improvement along with the relevant performance assessment of a wireless power transfer (WPT) system, is comprehensively pursued in this paper. The new device involves several arrangements of metamaterial components as its principal resonators. Moreover, a detailed examination regarding the competence of the proposed topology reveals a noteworthy advancement of the power...
This paper reports recent results obtained in the Ku and K bands by using a multiband rectenna. The targeted application is the electromagnetic harvesting of the spill-over losses of microwave antennas for powering autonomous wireless sensors used for satellite health monitoring. The experimental results demonstrate that this compact rectenna can harvest efficiently the incident electromagnetic energy...
Wireless power transfer (WPT) charging technology using magnetic field can transfer power to battery for drone without any electrical contact. It can be one of the safe and convenient battery charging methods. In spite of the great advantages, WPT system generates strong electromagnetic fields (EMFs), which causes interference on the electrical devices such as DGPS, speed controller, Bluetooth data...
We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array...
The Wireless Power Transfer (WPT) technology is a promising way to break the limit of capability and operation for satellites and make the satellites much lighter, smaller and more flexible and durable. This paper introduces the system integration techniques of WPT between satellites including the energy control subsystem, the laser-WPT subsystem and the microwave-WPT subsystem, and discusses the...
It has long been a significant challenge to improve the performance of flexible wireless power transfer. This paper proposes a novel controlled resonance power architecture for use in weakly coupled systems with less power processing stages, and investigates the basic design principles and implementation in power management ICs. Experiments show efficiency improvements in the range of 20–30% in practical...
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