A comparative study on transmission performance of multi‐stage wireless power transfer systems using SPS compensation and LCC compensation

SummaryIn this paper, irregular 32 pulse density modulation (PDM)‐controlled wireless power transfer (WPT) system is proposed for constant current (CC) and constant voltage (CV) outputs. The proposed WPT system has a load independent ZPA frequency characteristic with CC and CV outputs. Thus, soft switching conditions are achieved for both CC and CV outputs. An experimental prototype was prepared to validate the effectiveness of the proposed irregular 32 PDM‐controlled WPT system. WPT coil design parameters are presented and analyzed with lateral and rotational misalignment conditions in ANSYS. The experiments were determined as 3 A for CC output and 200 V for CV output. The maximum efficiency of the proposed system is measured (95.34%) at aligned coils with 100 mm air gap. In addition, the efficiency results are presented and evaluated by performing experimental studies under both lateral and rotational misalignment conditions.

“…The mutual inductance (

M

) is calculated as

M = k \sqrt{L_{1} L_{2}}

. The equivalent load resistance (

R_{L} true)

of the full bridge rectifier is defined as [26, 27]

R_{L} goodbreak= \frac{8 R_{O}}{π^{2}} .

…”

Section: Analysis Of the Series–series‐compensated Wpt Systemmentioning

confidence: 99%

Implementation of the irregular pulse density modulation‐controlled wireless power transfer system for constant current and constant voltage output

Unal,

Bal,

Oncu

2023

“…14 However, it is reported that the power transfer efficiency of the WPT system will drop dramatically when the charging distance increases. 15 To improve transfer efficiency, several methods including changing coil structure, [16][17][18] designing impedance matching circuits, 19 and adding nonlinear elements have been proposed. 20 In addition to the above approaches, metamaterial (MTM) also offers an alternative to cope with the problem that transfer efficiency is low at long charging distances.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is reported that the power transfer efficiency of the WPT system will drop dramatically when the charging distance increases 15 . To improve transfer efficiency, several methods including changing coil structure, 16–18 designing impedance matching circuits, 19 and adding nonlinear elements have been proposed 20 …”

Section: Introductionmentioning

confidence: 99%

Design of new metamaterial with negative permeability for efficient wireless power transfer

Wang,

Shi

et al. 2023

SummaryTo solve the problem that the efficiency of a wireless power transfer system decreases with increasing transmission distance, metamaterial (MTM) has offered an effective solution. In this paper, a novel compact MTM with negative permeability is designed to improve the transfer efficiency of wireless power transfer at the operating frequency of 13.56 MHz. By placing the MTM slab at different positions between coils, the transmission coefficient of the wireless power transfer system with one MTM slab is calculated. Also, the impact of transmission distance is studied. Based on the two‐port network method, the transfer efficiency of wireless power transfer is respectively calculated for the system with one MTM slab and with two MTM slabs. The results demonstrate that transfer efficiency at the transmission distance of 150, 200, and 250 mm are, respectively, 82.4%, 67.8%, and 47.3% when one MTM slab is introduced. For the system with two MTM slabs, the corresponding transfer efficiency is 84.9%, 77.3%, and 66.1% separately. Compared with the system without MTM, it is found that there is a large improvement in transfer efficiency especially when two MTM slabs are positioned between coils at the transmission distance of 250 mm. The magnetic field distribution of the system with one or two MTM slabs introduced is investigated. The results show that magnetic coupling between coils is strengthened, which is favorable for transfer efficiency enhancement.

“…To reduce the size and cost of an additional inductor, compensation capacitors are usually used in series with the transmitter coil to form an LCC compensation network. 30,31 An LCC compensation network is used to achieve zero phase angle (ZPA) with constant voltage output by adjusting the compensation network parameters. 32,33 In traditional WPT system, a stable DC power supply is typically used as the input voltage.…”

Section: Introductionmentioning

confidence: 99%

“…The LCL topology has the following two advantages: The inverter only provides active power at the secondary side; the current of the transmitting coil is independent of the load value. To reduce the size and cost of an additional inductor, compensation capacitors are usually used in series with the transmitter coil to form an LCC compensation network 30,31 . An LCC compensation network is used to achieve zero phase angle (ZPA) with constant voltage output by adjusting the compensation network parameters 32,33 …”

Section: Introductionmentioning

confidence: 99%

An adaptive feedback regulation method of wireless power transfer systems for compensating battery‐based source's fluctuations

Zhang,

Cai,

Zhao

et al. 2023

SummaryThis article proposes an adaptive feedback regulation method for wireless power transfer (WPT) systems, which can be applied to solve the problem of the drop in input voltage from the emergency power supply such as a battery‐based source. The whole WPT system transfers power mainly through the mutual inductance between the transmitter and receiver coils. The compensation coils are accessed to form the power feedback side, which can achieve constant voltage output by adjusting the duty cycle of the DC/DC converter. Furthermore, the finite element simulation result analyzes the constant voltage output characteristics of the proposed topology under different load conditions. Finally, an 85 kHz prototype based on the proposed method is built and tested to verify the performance and effectiveness of the design. The proposed method achieves a constant 48 V output when the load varies from 60 to 120 Ω and the horizontal offset distance varies from 20 to 80 mm.