Output Power Stabilization for Wireless Power Transfer System Employing Primary-Side-Only Control

Zhu, Huanjie; Zhang, Bo; Wu, Lihao

doi:10.1109/access.2020.2983465

Cited by 63 publications

(31 citation statements)

References 34 publications

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“…Both the primary linear resonator and the secondary linear resonator are composed of compensation network and coil, which is the key to the MCR-WPT system [7]. The transfer efficiency of linear resonator reaches the maximum at natural resonant frequency, while the transfer power reaches the maxima at the two splitting frequencies [8], [9]. Therefore, it is essential to ensure the stability of output voltage in the case of high efficiency operation.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Enhancement for Wireless Power Transfer System Employing Non-Linear Resonator

Jiao

Fan

et al. 2021

IEEE Access

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In order to enhance the tolerance of frequency misalignment and solve the amplitudebandwidth limitation issue of the traditional linear resonance wireless power transfer (WPT) system, this paper proposes a non-linear resonance WPT (NLR-WPT) system which is mainly composed of high frequency power supply, primary linear resonator, secondary non-linear resonator, and load. Such non-linear resonator can be implemented with passive linear capacitor and magnetic saturation inductor, and it can be described by Duffing equation. It has been shown that the bandwidth of NLR-WPT system in the nonlinear state is 1.7 times larger than that in the linear state. In addition, the output voltage basically stabilizes at the same level, the voltage fluctuation is less than 5% over the power frequency ranging from 25.6 kHz to 31.8 kHz, and high overall efficiency of 86.5% can be achieved under a wide range of frequency (27.5 kHz-30.1 kHz). Furthermore, the range of frequency can be extended significantly over which the output voltage is maintained even while the compensate capacitance, load, or coupling coefficient values vary in a certain range. The experimental results agree well with the theoretical analysis and verify the validity of the NLR-WPT system with non-linear resonator. This paper provides a simple and effective scheme to suppress the fluctuation of output voltage, which is suitable for the applications of constant voltage charging such as moving devices or electric vehicles.INDEX TERMS Wireless power transfer (WPT), bandwidth enhancement, stable output voltage, non-linear resonance, magnetic saturation inductor, Duffing equation.

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Section: Introductionmentioning

confidence: 99%

Bandwidth Enhancement for Wireless Power Transfer System Employing Non-Linear Resonator

Jiao

Fan

et al. 2021

IEEE Access

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“…VAB [15], [29][30][31][32][33][34][35][36] [29]- [36] [15] f Resonant frequency tracking verter's switches to operate in soft-switching condition, i.e., zero voltage switching (ZVS) turn-on. This optimum frequency de-tuning would benefit not only the efficiency of the inverter but also the high-frequency electromagnetic compatibility (EMC) of the radiated magnetic field since the softswitching operation reduces overshoots and ringing in the inverter's voltage and current waveforms.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the traditional resonant converters, it is also interesting to evaluate how the propagation delay affects specifically IPT systems' performance, where, the magnetic coupling between the main coils and the loading conditions can vary in a wide operating range, which corresponds to the H-bridge converter's currents with different amplitude and resonant frequency. In IPT applications, the delay compensation has been acknowledged in [17], [19], [23]- [29]. In [23], [24], the control uses a fieldprogrammable gate array (FPGA) to minimize this propagation delay.…”

Section: Introductionmentioning

confidence: 99%

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Auto-Resonant Detection Method for Optimized ZVS Operation in IPT Systems With Wide Variation of Magnetic Coupling and Load

Grazian

Soeiro

Duijsen³

et al. 2021

IEEE Open J. Ind. Electron. Soc.

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In wireless charging systems, the H-bridge converter's switching frequency is set close to the system's natural resonance for achieving optimized zero voltage switching (ZVS). Variations to the system's natural resonance are commonly tracked by following the changes in the resonant current's polarity, i.e., current zero-crossings. The main implementation challenge is accounting for the time delay between the real monitored current and the final resulting switches' commutations. This becomes critical at high switching frequencies, particularly when the magnetic coupling and loading vary widely. This paper proposes an autoresonant detection method that continuously ensures optimized ZVS turn-on with the minimal circulating current over the operable range of magnetic coupling and load. The suggested implementation provides two split variable references for the resonant frequency detection, which adaptatively compensate for the propagation delay based on the resonant current slope. The auto-resonant scheme is benchmarked against the commonly employed method with fixed current detection references. The results highlight the auto-resonant strategy's advantages, namely extended operable range, wider ZVS turn-on region, ease start-up, and improved DC-to-DC efficiency. The auto-resonant features and functionality are verified experimentally with a 200W low-voltage e-bike wireless charger. Finally, the benefits of the presented method are analytically explored for high-power applications by considering the H-bridge semiconductor losses of a state-of-art 50kW wireless charging system.INDEX TERMS Control, H-bridge converter, inductive power transfer, inverter, resonant converters, softswitching, wireless charging, zero voltage switching.

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“…In addition, the extra loss caused by the large number of components will reduce the overall efficiency of the WPT system to some extent. The authors of [27] propose a series-series compensated WPT system based on parity-time symmetry with front-end DC-DC converter and a primary-side-only control strategy in order to attain stable output power with high transfer efficiency under various coupling condition and load. For the method of adding DC-DC converter, the charging control of CC or CV can be realized, and the flexibility is higher.…”

Section: Introductionmentioning

confidence: 99%

The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

Zhang

Tan

et al. 2020

IEEE Access

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The equivalent resistance of the battery will change during charging in practical applications, so it is difficult to design a wireless power transfer (WPT) system with accurate constant current (CC) and constant voltage (CV) output characteristics. In addition, the WPT system efficiency is also affected by the change of equivalent resistance. Therefore, this paper studies the charging control and efficiency optimization strategy for the WPT system with dynamic loads. The WPT system with a structure of doublesided LCC compensation topology and containing controllable rectifier circuit at the secondary side is established, and the working process of full-bridge controllable rectifier circuit is analyzed. Then the output characteristics of the WPT system are analyzed. The expressions of the optimal transmission efficiency and the optimal equivalent impedance of the full-bridge rectifier are derived. The relationships between the equivalent impedance of the capacitor-filtered full-bridge controllable rectifier circuit and the phase shift angle, the charging current and the phase shift angle are also obtained. In this paper, the CC and CV charging strategies based on phase shift control of controllable rectifier circuit and efficiency optimization strategy based on dynamic equivalent impedance matching are proposed, which can improve the WPT system transmission efficiency while realizing CC and CV charging. Finally, the effectiveness of the proposed control strategy is verified by simulation and experiment. The WPT system realizes CC charging mode and CV charging mode in turn when the load resistance changes from 5 Ω to 30 Ω, and the overall efficiency is up to 90.71% at the transmission distance of 15cm. INDEX TERMS Wireless power transfer, constant current/voltage charging, efficiency optimization, phase shift control, dynamic impedance matching.

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Output Power Stabilization for Wireless Power Transfer System Employing Primary-Side-Only Control

Cited by 63 publications

References 34 publications

Bandwidth Enhancement for Wireless Power Transfer System Employing Non-Linear Resonator

Bandwidth Enhancement for Wireless Power Transfer System Employing Non-Linear Resonator

Auto-Resonant Detection Method for Optimized ZVS Operation in IPT Systems With Wide Variation of Magnetic Coupling and Load

The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

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