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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...
Wireless power transfer (WPT) technologies are magnetic and capacitive coupling methods, typically. The capacitive coupling WPT has many advantages such as simple structure, low electromagnetic interference and transferring with metal barrier. However, it is hard to reduce the impedance of coupling capacitor for sufficient received output voltage in the capacitive coupling WPT. Therefore, in this...
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...
This work presents the design of a temperature sensor in a 65nm CMOS technology, which is powered by harvesting the electromagnetic energy in the ISM frequency band (2.4GHz). The power consumption of the sensor was substantially reduced so that the energy required to operate could be stored in a 50µF external capacitor. The rectifier sensitivity has been improved so as to allow autonomous operation...
For reducing the development period of satellite, we propose an internal wireless system of satellite. In this paper, we designed a highly efficient 5.8 GHz rectifier based charge pump circuit, and introduced a class-F load that can make it on a process the third harmonic wave. For adjusting the most suitable applied voltage of diodes, we designed a new filter. Owing to inserting the class-F load...
The paper presents a simulation tool for the study of a dynamic IPT system. This simulator is able to provide information about the electrical components in function of the dynamic behavior of the vehicles during the charge operations. The results are used to investigate different possibilities for the improvement of the interfacing between the IPT system and the electrical grid to which it is connected.
This paper will present the modelling, analysis and design of a load-independent Class EF inverter. This inverter is able to maintain zero-voltage switching (ZVS) operation and produce a constant output current for any load value without the need for tuning or replacement of components. The load-independent feature of this inverter is beneficial when used as the primary coil driver in multi-megahertz...
In maximal link efficiency IPT design, a fixed AC load value is required. For this reason, matching the value of the input impedance of the rectifier to the optimal AC load is necessary. This paper presents a current driven Class D rectifier with a resistance compression network for 6.78MHz IPT systems, in which the reflected AC load has a minimal variation for a wide range of DC output loads. Experimental...
A Moving Field Inductive Power Transfer (MFIPT) system for wireless inductive power supply of electric vehicles on the road is described. To minimize losses only those primary coils located below the secondary coil of a vehicle are excited. The dynamics, the power balance of the MFIPT system, and the costs for the implementation of the system are discussed.
This paper presents the design and implementation of a voltage driven hybrid Class-E low dv/dt half wave rectifier with focus on high frequency (HF), 3 – 30 MHz, inductive power transfer (IPT). The hybrid rectifier is capable of absorbing the parasitic capacitance of the utlised diode while maintaining the properties of the conventional Class-E rectifier with a series capacitor. The hybrid rectifier...
In this paper, a novel matching circuit design method utilizing a genetic algorithm and measured S-parameters of randomly moved coils is discussed. From the analytical comparison of different matching circuit topology, the superiority of active matching circuit is suggested, and potentially there is 21.4 % improvement in wireless power transfer efficiency by using 4 cell active matching circuit, which...
This paper presents the design and characterization of a rectenna-based energy harvester for low-power aircraft sensors. The harvester is placed on the aircraft skin in the proximity of the radar altimeter transmit antenna with power densities between 0.04 µW/cm2to 2.2 µW/cm2around 4.3 GHz. Several diodes were investigated via source-pull, and the chosen devices integrated with a patch antenna to...
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