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This paper studies whether increased ranges of bistatic scatter radio communication are possible, especially when low-cost, embedded receivers, originally designed for conventional radio (and not for scatter radio) are employed. Wireless power transmission and bistatic scatter radio are closely related, and thus, this work aims to highlight a new exciting, potentially interesting, key-enabling research...
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...
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...
This paper proposes and outlines a novel method for wirelessly transmitting power using a combination of inductive coupling and single conductor power transfer. The power is wirelessly transmitted from a source to a single conductor, using a double ended coil and a single ended coil respectively. From the conductor, the power is similarly transmitted to multiple receivers. The Qi standard is implemented,...
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 power transfer (WPT) can provide a practical solution to powering implanted devices without requiring a power cable to puncture the skin. Whilst maximising link efficiency is normally the design aim of a WPT system in free space, there may be more suitable objectives if a receiver is implanted inside a patient, especially for devices with higher power consumption. This paper proposes alternative...
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...
This paper presents a novel approach for simultaneous inductive power transfer (IPT) and communication in one system. The communication part is using the coupled pair of coils of the IPT system as transmitting medium. The proposed architecture is applicable to new and existing IPT systems with operating frequencies above 100 kHz. The challenge is to enable robust and reliable communication in the...
Magnetic Resonance can support wireless charging for multiple receivers simultaneously. However, these receivers may have different charging requirement, due to the distance between transmitter and receiver, device type and energy demand. Simultaneous charging can also lead to poor comprehensive wireless charging efficiency. We propose a charging priority for the devices in the charging area, considering...
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...
This paper addresses a steerable focus generation scheme for two-dimensional waveguide power transfer (2DWPT). In 2DWPT systems, a receiver coupler put on a waveguide sheet is powered wirelessly by capturing a microwave propagating across the sheet as its non-radiative guided mode. Generating a microwave focus in the waveguide sheet underneath the receiver is desirable for efficient and safe power...
Wireless power transfer is a popular research subject in recent years. Available frequency for wireless power transfer (WPT) is limited by the industrial, scientific, and medical (ISM) radio bands in MHz band and some laws. Depending on the application of wireless power transfer, different frequency bands are used. A single transmitter coil which can adapt to multiple frequency bands is needed for...
A dual-band wireless neural stimulation device with high frequency (HF) wireless power transfer (WPT) at 13.56MHz and ultra high frequency (UHF) backscatter communication (BSC) at 915MHz is presented. Neural interfaces hold great promise in the development of future treatment/therapy for debilitating neurological disorders, spinal cord damage, and loss of limb function. Most state-of-the-art wireless...
In this paper, a load identification approach for dynamic wireless power transfer for electric vehicles is introduced. In the proposed method, determination of the load parameters and position are achieved without requiring any communication link between the transmitter and receiver or using any extra coil. The load detection procedure is achievable using two modes: the energy injection mode and the...
Lab-on-a-disc allows a large variety of microfluidic assays, in research, and lately also in industry. Standard lab discs are purely passive devices with off disc read-out, therefore efforts in electrically accessing the disc have been implemented with rather complicated setups via slip rings or generators. Here, we present a universal platform that not only transfers wireless energy to the disc,...
This paper proposes a fast receiver-side load control method for high frequency wireless power transfer (WPT) using electromagnetically coupled parallel line feeder. In the WPT system, hybrid inductive-capacitive coupling and iterative receiver-side load control have been proposed to stabilize the received power against impact of standing wave. However, the iterative load control is time-consuming...
This paper presents an inductive coupling wireless power receiver with high efficiency active rectifier and multi feedback LDO regulator. The synchronous active rectifier with the zero current sensing is proposed to achieve the high efficiency minimizing the reverse leakage current. Multi Feedback LDO regulator is proposed to implement the output voltage regulation, over voltage protection, over current...
Wireless Power Transfer (WPT) is an emerging technology with a huge variety of possible applications, including wireless charging of mobile devices like smart-phones or tablet computers. In this work, a WPT receiver system integrated on a silicon chip is proposed to maximize the efficiency of the system. The presented chip is produced in a low cost standard 130 nm CMOS process with a high voltage...
A wireless power transfer system is conceived to empower light drones and unmanned aerial vehicles. To satisfy the power budget of the wireless link and provide enough power to the drone, new circuits based on directive frequency-scanned leaky-wave antennas and circuits are proposed. It is shown how the proposed leaky-wave devices introduce enough gain in the receiver system, while assuring reception...
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