A Maximum Efficiency Point Tracking Control Scheme for Wireless Power Transfer Systems Using Magnetic Resonant Coupling

Li, Hongchang; Li, Jie; Wang, Kangping; Chen, Wenjie; Yang, Xu

doi:10.1109/tpel.2014.2349534

Cited by 495 publications

(269 citation statements)

References 25 publications

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“…The power circuit and its linear equivalent circuit of the WPT system are shown in Figure 2a,b, respectively, and the block diagram for control is shown in Figure 3. example because the resonant frequency in the SS topology is independent of the load and the coupling coefficient [12,18]. The TX current and RX current are treated as the self-oscillating feedback variables to analyze the self-oscillating characteristics, and the RX current is chosen for feedback because the system operates steadily in the middle resonant frequency with the maximum efficiency, regardless of the frequency splitting.…”

Section: Analysis Of the Self-oscillating Feedback Methodsmentioning

confidence: 99%

“…However, due to the frequency-splitting in close coupling condition, there may be multiple resonant points, such as the middle resonant point, odd, and even splitting points. The previous self-oscillating methods make the system operate at one of the splitting points, but not always with maximum efficiency [18][19][20], and some studies indicate that the self-oscillating system becomes unstable under disturbance because it will hop from one splitting point to another when the circuit parameters change [17].…”

Section: Introductionmentioning

confidence: 99%

“…The WPT system is modeled as a non-linear switched system, and the Hamel locus is applied since it is precise Energies 2016, 9, 491 3 of 16 and intuitive in the prediction of self-oscillating frequency and its variation trend, and is easy in modelling the delay link [21,24]. The series-series (SS) topology WPT system is chosen as an example because the resonant frequency in the SS topology is independent of the load and the coupling coefficient [12,18]. The TX current and RX current are treated as the self-oscillating feedback variables to analyze the self-oscillating characteristics, and the RX current is chosen for feedback because the system operates steadily in the middle resonant frequency with the maximum efficiency, regardless of the frequency splitting.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer

Ren

Wen-an

2016

Energies

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Abstract:The synchronous tuning of the self-oscillating wireless power transfer (WPT) in a close-coupling condition is studied in this paper. The Hamel locus is applied to predict the self-oscillating points in the WPT system. In order to make the system operate stably at the most efficient point, which is the middle resonant point when there are middle resonant and split frequency points caused by frequency-splitting, the receiver (RX) rather than the transmitter (TX) current is chosen as the self-oscillating feedback variable. The automatic delay compensation is put forward to eliminate the influence of the intrinsic delay on frequency tuning for changeable parameters. In addition, the automatic circuit parameter tuning based on the phase difference is proposed to realize the synchronous tuning of frequency and circuit parameters. The experiments verified that the synchronous tuning proposed in this paper is effective, fully automatic, and more robust than the previous self-oscillating WPT system which use the TX current as the feedback variable.

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Section: Analysis Of the Self-oscillating Feedback Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer

Ren

Wen-an

2016

Energies

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“…RL is calculated by Vo/Io, and θ can be obtained according to (44). Then, Re and Xe can be calculated based on (15) and (16). Finally, additional reactance and mutual inductance estimations can be achieved according to Equations (37) and (41), respectively.…”

Section: Additional Reactance and Mutual Inductance Estimationsmentioning

confidence: 99%

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

et al. 2017

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Nowadays, work on Wireless Power Transfer (WPT) systems with dual active bridges is attracting great attention due to their low conduction losses, power regulation, load transformation and reactance compensation. However, in these studies limitations such as overall analysis, design and realization techniques of the system were not considered properly. To address the aforementioned issues, this paper presents a detailed analysis, design and realization of a Series-Series (SS) WPT system with dual active bridges, which will improve the overall performance. Three independent Phase Angles (PAs) have been analyzed and designed in this study, one PA on the primary side and the other two PAs on the secondary side. This Multiple Degrees of Phase Control (MDPC) method can achieve additional reactance compensation, load transformation and output regulation simultaneously. To realize the proposed method in practice, key implementation techniques have been investigated in detail, including additional reactance estimation, mutual inductance estimation, phase detection and synchronization. The feasibility and effectiveness of the proposed system is verified through simulation and experimental results.

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“…Traditionally, impedance matching method is utilized to realize the maximum power transfer tracking (MPTT) [17]. Reference [18] realizes the impedance matching by adding passive components while references [5,[19][20][21] do the impedance matching through DC/DC converters (e.g., Boost, Buck, Sepic, etc.). Since the load resistance of a practical WPT system varies with time, therefore using DC/DC converters to do the impedance matching is more suitable for the frequent load variations [19].…”

Section: Introductionmentioning

confidence: 99%

A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem

Dai

et al. 2017

Energies

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Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to a loosely coupling characteristic, the variation of coupling coefficient will certainly affect the performance of impedance matching, therefore MPTT will fail accordingly. This paper presents an identification method of coupling coefficient for MPTT in WPT systems. Especially, the two-value issue during the identification is considered. The identification approach is easy to implement because it does not require additional circuit. Furthermore, MPTT is easy to realize because only two easily measured DC parameters are needed. The detailed identification procedure corresponding to the two-value issue and the maximum power transfer tracking process are presented, and both the simulation analysis and experimental results verified the identification method and MPTT.

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A Maximum Efficiency Point Tracking Control Scheme for Wireless Power Transfer Systems Using Magnetic Resonant Coupling

Cited by 495 publications

References 25 publications

Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer

Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem

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