Extension of ZVS Region of Series–Series WPT Systems by an Auxiliary Variable Inductor for Improving Efficiency

Li, Yong; Liu, Shunpan; Zhu, Xiaoguang; Hu, Jiefeng; Zhang, Min; Mai, Ruikun

doi:10.1109/tpel.2020.3042011

Cited by 93 publications

(25 citation statements)

References 30 publications

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“…Another requirement is high efficiency, which has been widely recognized as an important objective to design a WPT system. Particularly, the conduction loss and switching loss from high-frequency (HF) switching devices are attributed significantly to low efficiency of a WPT system [7]. In this sense, the reduction of these two power losses is necessary for HF switching devices, which is the key factor affecting the efficiency of the system.…”

Section: A Current Problemmentioning

confidence: 99%

“…Inspired by the merit of circulating current elimination, we propose to incorporate DHB inverters into WPT systems. Building on our previous efforts in extending ZVS range by using auxiliary variable inductors (VIs) [7], a control method based on two VIs instead of two fixed inductors on the output side of DHB inverters is developed for CC/CV charging. Specifically, the VIs are exploited as system's control degree of freedom to realize CC or CV, so as to avoid the PS control and circulating loss.…”

Section: Motivations and Contributionsmentioning

confidence: 99%

“…In the proposed topology, primary current distribution has been achieved due to the DHB inverter. From [7], the conduction loss of inverter can be calculated as (10) where PCond represents the MOSFETs' conducting loss; rm is the drain-source on-state resistance.…”

Section: Proposed Dhb Inverter Topology With Variable Inductorsmentioning

confidence: 99%

See 2 more Smart Citations

High-Efficiency WPT System for CC/CV Charging Based on Double-half-bridge Inverter Topology with Variable Inductors

Zhu¹,

Zhao²,

Li³

et al. 2021

IEEE Trans. Power Electron.

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Efficiency remains a key challenge in wireless charging in academia and industry. In this paper, a new wireless power transfer (WPT) system based on a double-half-bridge (DHB) inverter with two variable inductors (VIs) is proposed. Compared with conventional full-bridge (FB) inverters, the DHB inverter can reduce the current through the MOSFETs under the same output power and thus, reduce the conduction loss. Next, by adjusting the inductances of the VIs instead of using phase shift (PS) method, the output voltage or current can be controlled, while the circulating current can be eliminated and wide-range zero voltage switching (ZVS) operation can be achieved. Consequently, the power loss can be further reduced. Circuit analysis, VI design as well as hardware implementation are provided in detail. A laboratory prototype is built to verify the feasibility of the proposed method. Close agreement is obtained between simulation and experimental results. The maximum efficiency can reach 92.4%, which is 3.65% higher than traditional PS control.Index Terms-Wireless power transfer (WPT), double-halfbridge (DHB) inverter, variable inductor (VI), zero voltage switching (ZVS), output voltage or current.

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Section: A Current Problemmentioning

confidence: 99%

Section: Motivations and Contributionsmentioning

confidence: 99%

See 1 more Smart Citation

High-Efficiency WPT System for CC/CV Charging Based on Double-half-bridge Inverter Topology with Variable Inductors

Zhu¹,

Zhao²,

Li³

et al. 2021

IEEE Trans. Power Electron.

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“…The widespread adoption of EVs places a great demand on the charging infrastructures. Wireless power transfer (WPT) as an emerging technology [1][2][3] has several unique advantages over conductive charging such as low electrocution risk and being highly attractive for autonomous charging. Several technical challenges must be resolved to ensure ubiquitous wireless charging in EVs.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design for constant current/constant voltage multi‐coil wireless power transfer system with high EMF reduction

Luo

Pathmanathan

Han

et al. 2022

IET Power Electronics

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The investigation on the constant current (CC)/constant voltage (CV) charging for the electric vehicle wireless power transfer (WPT) system has been widely conducted. However, the CC/CV performance under misalignment cases has been scarcely studied especially for the multi‐coil WPT system. The resonant tank compensation methodology for the exciter‐quadrature‐repeaters (EQR) transmitter‐based multi‐coil WPT system is studied to achieve high power factor CC/CV charging with low leakage flux over ±150 mm lateral misalignment range. The EQR transmitter consists of one small exciter coil powered by a single full bridge inverter and two larger decoupled quadrature repeater coils which are magnetically coupled to the exciter coil. A variable switched capacitor is applied on the exciter side to maintain a high power factor in the CV mode. A 3‐kW experimental setup with a 200 mm nominal vertical distance was built and a three‐coil WPT system with a single large repeater coil is chosen as a comparison. Experimental results show that the EQR transmitter‐based WPT system achieves 92% coil‐to‐coil efficiency and reduces the leakage flux density by 70% compared with the existing three‐coil system in the CV mode at 150‐mm lateral misalignment.

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“…Some modulation and control methods are proposed for achieving Zero Voltage Switching (ZVS) operations. In [34], an auxiliary variable inductor is proposed to extend the ZVS operation range on the inverter. In [35], [36], to achieve ZVS operation on both the inverter and the rectifier with a wide range, a Variable-Angle-Phase-Shift (VAPS) modulation method is proposed for regulating the dual-side active bridge converter.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Improvement of Dual-Receiver WPT Systems Based on Partial Power Processing Control

Liu

Zhao

et al. 2022

IEEE Trans. Power Electron.

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Extension of ZVS Region of Series–Series WPT Systems by an Auxiliary Variable Inductor for Improving Efficiency

Cited by 93 publications

References 30 publications

High-Efficiency WPT System for CC/CV Charging Based on Double-half-bridge Inverter Topology with Variable Inductors

High-Efficiency WPT System for CC/CV Charging Based on Double-half-bridge Inverter Topology with Variable Inductors

Analysis and design for constant current/constant voltage multi‐coil wireless power transfer system with high EMF reduction

Efficiency Improvement of Dual-Receiver WPT Systems Based on Partial Power Processing Control

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