Eddy current loss analysis and frequency optimization design of double-sided LCC-IPT system in seawater environment

Sun, Pan; Wu, Xusheng; Cai, Jin; Wang, XiaoNa; Zhang, Xiaochen; Yan, Liang; Xiong, Qiao; Rong, Enguo

doi:10.1007/s11431-021-1917-1

Cited by 6 publications

(9 citation statements)

References 9 publications

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“…Although the efficiency of the underwater CPT circuit with the proposed coupler is still relatively low, there has been an improvement in both power transfer level and efficiency compared to previous related research. Following the design process shown in Figure 12, when R 1 = 50 Ω, parameters P IN , U DC , and U O in Table 5 are substituted into (7) and (10). Similarly, when R 2 = 200 Ω, parameters P IN , U DC , and U O in Table 5 are substituted into (7) and (10).…”

Section: Experimental Validationmentioning

confidence: 99%

“…Following the design process shown in Figure 12, when R 1 = 50 Ω, parameters P IN , U DC , and U O in Table 5 are substituted into (7) and (10). Similarly, when R 2 = 200 Ω, parameters P IN , U DC , and U O in Table 5 are substituted into (7) and (10). With the aforementioned four equations, the equivalent parameters of the proposed coupler can be derived.…”

Section: Experimental Validationmentioning

confidence: 99%

“…A high-frequency magnetic field would induce an eddy current in a conductor. Consequently, commonly used IPT systems face challenges such as underwater eddy current losses [7,8]. A high-frequency electric field, rather than a magnetic field, is generated by metal plates in CPT.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Coupler of Capacitive Power Transfer for Enhancing Underwater Power Transfer Characteristics

Zhang,

Lian

2023

Electronics

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Compared to inductive power transfer (IPT) technology, capacitive power transfer (CPT) technology offers unique advantages such as being cost-effective, lightweight, and free from eddy-current losses, making it more suitable for underwater power transfer. Unlike air, water can conduct electricity and the electric conductivity of different kinds of waters varies with different ion concentrations, which would greatly affect the equivalent model of the underwater couplers. To address this issue, multiple types of underwater coupler working in different kinds of water are compared and analyzed. The influence of the electrical conductivity of water on the capacitive coupler is comprehensively analyzed, and the novel capacitive coupler and its equivalent model are proposed to improve power transfer efficiency. To verify the theoretical analysis, the double-sided LC-compensated CPT circuit is built and tap water is used in the experiment. The experimental results are consistent with the theoretical analysis. In addition, the experimental results also validate the superiority of the proposed capacitive coupler compared to existing research.

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Section: Experimental Validationmentioning

confidence: 99%

Section: Experimental Validationmentioning

confidence: 99%

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A Novel Coupler of Capacitive Power Transfer for Enhancing Underwater Power Transfer Characteristics

Zhang,

Lian

2023

Electronics

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“…Reference [16] proposed a T-shaped circuit model that equates the influences of eddy currents to three branch resistances. Reference [17] equated the eddy current to two resistances on the primary and secondary sides. References [16,17] analyzed the short-range transfer capability where an eddy current is regarded as a loss, finding that the transfer efficiency in seawater is lower when compared to that in air.…”

Section: Introductionmentioning

confidence: 99%

Experimental Results and Analysis of Midrange Underwater Asymmetric Wireless Power Transfer

Chen,

Niu,

Yang

et al. 2024

JMSE

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The eddy current loss caused by the conductivity of seawater results in a relatively low transfer efficiency of underwater wireless power transfer (WPT). And the transfer distance of the current WPT system is relatively short. Considering that most of the wireless power transfer devices in practical applications are asymmetric, few studies have explored the transfer characteristics of asymmetric midrange WPT in seawater. In this study, it is experimentally found that the load voltage and transfer efficiency of an asymmetric midrange WPT system with reduced primary balancing resistance in seawater are nearly twice as high as those of a symmetric one at a 50 cm transfer distance and a 410 kHz operation frequency with a 44.4 Ω load resistance. A new circuit model of the underwater WPT system with complex impedance and complex mutual inductance is then presented, and the load voltages predicted by the model are consistent highly with the experimental values; the model is then utilized for the explanation of the experimental observations. Changing the load resistance also improves the transfer efficiency of the system; however, the eddy current loss results in a relatively low transfer efficiency of 30.9% at an optimal load resistance of 90 Ω. The asymmetric midrange underwater WPT system can be applied in scenarios where the transfer distance is prioritized.

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“…Inductive power transfer (IPT) has gained popularity nowadays for its nonphysical contact between the power side and load side [1,2]; it is used in different scenarios, such as electric vehicles [3][4][5] and autonomous underwater vehicles (AUVs) [6][7][8][9]. The AUV can be charged wirelessly without direct contact compared to the conventional charging method with watertight connecters, which can effectively improve the navigation distance and operation range of the AUV.…”

Section: Introductionmentioning

confidence: 99%

An Underwater Inductive Power Transfer System with a Compact Receiver and Reduced Eddy Current Loss

Zhang

Zhao

et al. 2022

JMSE

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Inductive power transfer (IPT) technology is widely used in autonomous underwater vehicles (AUVs) to achieve safety and flexibility. However, the eddy current loss (ECL) will be generated in the seawater due to the high-frequency alternating current in the transmitter and receiver. An underwater IPT system with a series-none (SN) compensation topology is proposed in this paper to achieve a compact receiver for AUVs and reduce the ECL. The analytical model of the IPT system is built to analyze its transfer performance. The phase difference between the transmitter and receiver current of the SN compensation topology is larger than 90° compared to that of the conventional series-series (SS) topology, which can significantly decrease the magnitude of the electric field caused by coil currents; thus, the eddy current loss is reduced. Moreover, the optimal load resistance of the seawater IPT system is lower than that in the air, and the SN compensation topology has a more compact receiver with no compensation capacitor in the receiving side, which can save the internal space in the AUVs. An experimental prototype based on the SN topology is built, and the experimental results have verified the analysis.

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Eddy current loss analysis and frequency optimization design of double-sided LCC-IPT system in seawater environment

Cited by 6 publications

References 9 publications

A Novel Coupler of Capacitive Power Transfer for Enhancing Underwater Power Transfer Characteristics

A Novel Coupler of Capacitive Power Transfer for Enhancing Underwater Power Transfer Characteristics

Experimental Results and Analysis of Midrange Underwater Asymmetric Wireless Power Transfer

An Underwater Inductive Power Transfer System with a Compact Receiver and Reduced Eddy Current Loss

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