scholarly journals Magnetic Coupler Optimization for Inductive Power Transfer System of Unmanned Aerial Vehicles

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7024
Author(s):  
Xiaokun Li ◽  
Junwei Lu ◽  
Sascha Stegen
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Output Power ◽  
Magnetic Coupling ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Experimental Platform ◽  
Aerial Vehicles ◽  
Spiral Coils ◽  
The Magnetic Field ◽  
Inductive Power

Unmanned aerial vehicles (UAVs) have been widely used in military and civilian applications. However, the insufficient cruising range restricts the development of UAVs due to the limitation of their battery. Inductive power transfer (IPT) is an effective way to charge the battery and solve this problem. Magnetic coupler is a key component of the IPT system, which greatly affects the power transfer and efficiency of the IPT. This paper proposes a new magnetic coupler with vertical spiral coils and ferrite PQI cores for the IPT system of UAVs, which can enhance the magnetic coupling and improve the performance of the IPT system. Finite element simulations are used to investigate the magnetic field distribution and coupling capability of the proposed magnetic coupler. In addition, an experimental platform is built to prove the validity of the IPT system using the proposed magnetic coupler. The results show that the coupling coefficient can reach 0.98, and the system transfer efficiency is 89.27% with an output power of 93 W. The IPT system also has a perfect misalignment tolerance and can achieve a stable output power.

scholarly journals Integrated Control Strategy for Inductive Power Transfer Systems with Primary-Side LCC Network for Load-Average Efficiency Improvement

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 312 ◽  
Author(s):  
Sangjoon Ann ◽  
Woo-Young Lee ◽  
Gyu-Yeong Choe ◽  
Byoung Kuk Lee
Keyword(s):  
Output Power ◽  
Control Strategy ◽  
Integrated Control ◽  
Control Mode ◽  
Power Transfer ◽  
Additional Advantage ◽  
Inductive Power Transfer ◽  
Average Efficiency ◽  
Load Average ◽  
Inductive Power

An inductive power transfer (IPT) system has lower peak efficiency and significantly lower load-average efficiency over the entire range of output power than typical power conversion systems because it transmits power wirelessly through magnetically coupled coils. In order to improve the load-average efficiency of the IPT system, this paper proposes an integrated control strategy consisting of full-bridge, phase-shift, and half-bridge control modes. The coupling coefficient and output power conditions for each control mode are theoretically analyzed, and the proposed control algorithm is established. In order to verify the analysis results, a 3.3 kW IPT system prototype is constructed, and it is experimentally verified that the load-average efficiency is improved by up to 3.75% with respect to the output power when using the proposed control scheme. In addition, the proposed control has the additional advantage that it can be directly applied to the existing IPT system without changing or adding hardware.

scholarly journals Development of a Digitally Controlled Inductive Power Transfer System with Post-Regulation for Variable Load Demand

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 58
Author(s):  
Kateryna Stoyka ◽  
Antonio Vitale ◽  
Massimo Costarella ◽  
Alfonso Avella ◽  
Mario Pucciarelli ◽  
...  
Keyword(s):  
Phase Shift ◽  
Output Power ◽  
Output Voltage ◽  
Voltage Regulation ◽  
Control Technique ◽  
Switching Frequency ◽  
Variable Load ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Inductive Power

Inductive Power Transfer (IPT) is an emerging technology enabling a contactless charging process in manifold applications such as electric vehicles, wearable and portable devices, or biomedical applications. Such technology can be profitably used to develop enhanced electronic solutions in the framework of smart cities, homes and smart workplaces. This paper presents the development and realization of a series–series compensated IPT System (IPTS) followed by a post-regulator implemented by means of a DC–DC converter. Such a system is modeled through a first harmonic approximation method, and a sensitivity analysis of the IPTS performance is carried out with respect to the variations of the primary inverter switching frequency and phase-shift angle. As an element of novelty of this work, the bias points are determined which allow the efficiency maximization while ensuring system controllability. An enhanced dynamic modeling of the system is then performed by means of a coupled mode theory, including the inverter phase-shift modulation and extending its validity to whatever operating frequency. A digital control of the post-regulator is implemented by means of a commercial low-cost microcontroller enabling the output voltage regulation under both fixed and variable load conditions through a voltage mode control technique. An IPTS prototype is eventually realized, which is able to correctly perform the output voltage regulation at the desired nominal value of 12 V for static resistive loads in the range [5,24] Ω, yielding the output power in the range [6, 28.8] W and the experimental efficiencies going from 72.1% (for 24 Ω) to 91.7% (for 5 Ω). The developed system can also be effectively used to deliver up to 35 W output power to variable loads, as demonstrated during the battery charging test. Finally, an excellent output voltage regulation is ascertained for load transients between 5 Ω and 24 Ω, with limited over- and undershoot amplitudes (less than 3% of the nominal output voltage), thus enabling the use of the proposed system for both fixed and variable loads in the framework of smart homes and workplaces applications.

scholarly journals The Analysis of LCL Resonant Inverter for Inductive Power Transfer Application

2017 ◽  
Vol 11 (2) ◽  
pp. 143-153
Author(s):  
Nattapong Hatchavanich ◽  
Mongkol Konghirun ◽  
Anawach Sangswang ◽  
Sumate Naetiladdanon
Keyword(s):  
Magnetic Coupling ◽  
Voltage Source ◽  
Power Transfer ◽  
Battery Charger ◽  
Inductive Power Transfer ◽  
Conduction Loss ◽  
Resonant Inverter ◽  
Operating Points ◽  
Inductive Power

Inductive power transfer (IPT) systems use the principle of magnetic coupling to transfer power through the air gap. A wireless battery charger is used as a case study. The resonant inverter is used to generate the high frequency current transmitting through the power pad. The basic topologies give the large inverter current with the large conduction loss. This paper proposes the LCL resonant voltage source inverter using low power device rating. The proposed IPT system has two operating points with different powers required. The ZVS operation region and two operating points are validated by the AC sweep of actual load and the frequency response of entire system. Finally, the experimental results at two operating points with the efficiency comparisons are included to verify the proposed system.

scholarly journals Improved Efficiency of Inductive Power Transfer in Misalignment Conditions with Multi Coil Design

2019 ◽  
Vol 8 (1) ◽  
pp. 30-36 ◽  
Author(s):  
P. B. Laksono ◽  
M. Alaydrus
Keyword(s):  
Transfer System ◽  
Power Transfer ◽  
Coil Design ◽  
Wireless Power ◽  
Effective Coupling ◽  
Inductive Power Transfer ◽  
Coupling Structure ◽  
Coil Structure ◽  
Spiral Coils ◽  
Inductive Power

In charging process of electric vehicle, a misalignment between the transmitter (Tx) and receiver (Rx) coupling  structure decreases the efficiency of the wireless power transfer. In inductive power transfer system, misalignment reduces the effective coupling between the Tx and Rx coils. In this work, based on previous multiple coil structures, a new multi coil design in proposed to increase the efficiency of the power transfer. Here, a multi coil structure with two rectangular and four spiral coils is designed with the overall dimension of the coil structure 26.5 cm x 36.5 cm. The measurement shows, that for coil distance below 10.3 cm and a lateral misalignment of maximal 10 cm (27.4%), the efficiency of the designed multi coil structure is better compared to previous coil structures. However for larger coil distance or larger misalignment, the efficiency of the new coil structure deteriorates significantly.

Sign in / Sign up

Export Citation Format

Share Document