Load-Independent Voltage and Current Transfer Characteristics of High-Order Resonant Network in IPT System

Lu, Jianghua; Zhu, Guorong; Lin, D.; Wong, Siu-Chung; Jiang, Jin

doi:10.1109/jestpe.2018.2823782

Cited by 81 publications

(45 citation statements)

References 33 publications

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“…The input of the system is the DC voltage source, which becomes the high-frequency AC square wave after passing through the high-frequency inverter. In addition, to be equivalent to U im as the input, the DC voltage needs to meet (26)…”

Section: Simulation and Experimental Validationmentioning

confidence: 99%

“…[25], integrated control method of load estimation and power tracking are proposed to achieve CC/CV charging of LCC compensation WPT system. In the paper of [26], a general modeling methods for the high-order resonant circuit is proposed to investigate the load-independent voltage and current transfer characteristics. These studies can realize the control of CC or CV output on the design of different resonant compensation structures.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Simulation and Experimental Validationmentioning

confidence: 99%

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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“…An arbitrary higher-order resonant network can be modeled as multistage T-circuit in series to analyze its load-independent voltage transfer characteristic [11]. For Figure 3, it can be equivalent to Figure 4.…”

Section: Charging Mode At a Zero Phase Angle Frequencymentioning

confidence: 99%

“…The DC/DC converter will inevitably increase the component counts and associated costs and losses. In order to simultaneously achieve ZPA condition and constant output current or voltage without the helps of any additional converter and control method, designing special resonant condition for the compensation topology in a WPT system is an effective solution [10,11].…”

Section: Introductionmentioning

confidence: 99%

Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger

Yang

Deng

et al. 2020

Electronics

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Wireless power transfer (WPT) techniques have gained wide acceptance across a range of battery charging applications such as cell phones, cardiac pacemakers, and electric vehicles. In a wireless battery charging system, a constant current/constant voltage (CC/CV) charging strategy, regardless of the variation of the battery load which may roughly range from a few ohms to several hundred ohms, is typically adopted to ensure the safety, durability, and performance of the battery. However, system efficiency drops significantly as the load increases in CV mode, especially at very light-load conditions. This paper proposes an efficiency optimization method for an LCC-parallel compensated inductive power transfer (IPT) battery charging system without the help of any additional power converter and control method. The equivalent circuit and resonant conditions of the LCC-parallel compensation topology are firstly analyzed to achieve the load-independent CV output at a zero phase angle (ZPA) operating frequency. Over the full range of CV charging mode, the efficiency of the LCC-parallel resonant tank circuit is analyzed and optimized. An IPT battery charger prototype with 48 V charging voltage and 1 A charging current is implemented. A measured DC–DC transfer efficiency of greater than 90.48% is achieved during the whole CV charging profile.

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“…This deficiency was solved in [18]- [21] by introducing another capacitor in series with coupling coils, which usually named LCC topology. Many works [22]- [24] have adopted this strategy and demonstrate higher and stable efficiency. The LCC compensation topologies provide many desirable performances, such as ZPA operations, high freedom of design, but more resonant elements, resulting in complex tune and the increase of system size and cost.…”

Section: Introductionmentioning

confidence: 99%

Design of LCC-S Compensation Topology and Optimization of Misalignment Tolerance for Inductive Power Transfer

Zhang

Cui

et al. 2020

IEEE Access

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This paper proposes a novel parameter tuning method topology for inductive power transfer (IPT) system with excellent load-independent current output. Based on LCC-S compensation topology, detailed derivations of parameters to realize load-independent current output is systematically analyzed. The realizations of zero voltage switching (ZVS) and reactive power demand are discussed by theoretical deduction and numerical simulation. Moreover, from the perspective of maintaining stable transmission power, the parameters detuning method to enhance misalignment tolerance is presented. Theoretical analysis shows that the appropriate detuned resonant tank is advantageous in performance, especially the smoothing of current output to variation of coupling coefficient. The novel LCC-S compensation topology holds high design freedom and high efficiency, while the robust power characteristic against wide misalignment region minimizes the need of complex control. Finally, the IPT prototype is built and test to validate the feasibility of the proposed topology. The efficiency of system is always higher than 86% in tuned parameters and 73% in detuned condition. The fluctuation of current is less than 7.5% when the coupling coefficient varies almost 170% (from 0.293 to 0.5). INDEX TERMS Inductive power transfer (IPT), compensation network, zero voltage switching (ZVS), misalignment tolerance

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Load-Independent Voltage and Current Transfer Characteristics of High-Order Resonant Network in IPT System

Cited by 81 publications

References 33 publications

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

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

Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger

Design of LCC-S Compensation Topology and Optimization of Misalignment Tolerance for Inductive Power Transfer

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