Inductively coupled wireless power transfer with class-E&lt;sup&gt;2&lt;/sup&gt; DC-DC converter

Nagashima, Tadamichi; Inoue, Kazuhide; Wei, Xiuqin; Bou, Elisenda; Alarcón, Eduard; Sekiya, Hiroo

doi:10.1109/ecctd.2013.6662278

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…The proposed system showed the capability to produce a 30 kHz waveform from a 50 Hz source. A promising technology is the class E 2 DC-DC converter which has been proposed for WPT systems in [43][44][45]. A class E 2 converter offers ZVS and zero derivative switching (ZDS) for the inverter at an optimum load condition R = R opt = 8/ π 2 + 4 * V 2 I /P o where V I is the input voltage and P o is the output power.…”

Section: Convertersmentioning

confidence: 99%

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

2022

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This article classifies, describes, and critically compares different compensation schemes, converter topologies, control methods, and coil structures of wireless power transfer systems for electric vehicle battery charging, focusing on inductive power transfer. It outlines a path from the conception of the technology to the modern and cutting edge of the technology. First, the base principles of inductive coupling power transfer are supplied to give an appreciation for the operation and design of the systems. Then, compensation topologies and soft-switching techniques are introduced. Reimagined converter layouts that deviate from the typical power electronics topologies are introduced. Control methods are detailed alongside topologies, and the generalities of control are also included. The paper then addresses other essential aspects of wireless power transfer systems such as coil design, infrastructure, cost, and safety standards to give a broader context for the technology. Discussions and recommendations are also provided. This paper aims to explain the technology, its modern advancements, and its importance. With the need for electrification mounting and the automotive industry being at the forefront of concern, recent advances in wireless power transfer will inevitably play an essential role in the coming years to propel electric vehicles into the common mode of choice.

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Section: Convertersmentioning

confidence: 99%

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

2022

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“…The class E resonant inverter has become one of the first topologies in wireless power transmission applications in recent years by virtue of its strong power transmission capacity, high efficiency and sinusoidal output current [8], [9], [10], [11]. In 2010, X. Wei from Chiba University emphasized the influence of the gate-drain parasitic capacitance of semiconductor field effect tube (MOSFET) as a switching device, gave the waveform expression and design equation that met the optimal switching conditions (ZVS and ZVDS at the same time), and designed a class E inverter with an operating frequency of 7MHz [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the following year, the team took the influence of MOSFET drain-source nonlinear parasitic capacitance into consideration and designed a Class E resonant inverter with a working frequency of 4MHz, output power of 2.16W and efficiency of 92.2% [9]. In 2013, T. Nagashima from Chiba University proposed an induction-coupled wireless power transmission system based on a class E2 converter for the first time [10]. In the design, the class E resonant inverter was adopted as the transmitter and the class E rectifier as the receiver.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of the Suboptimum Class-E_M/F₃ Resonant Inverter

Yang,

Li,

Liu

et al. 2023

IEEE Access

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In this paper, the analysis and design method for the suboptimum Class-E M /F 3 inverter (i.e., only the zero-voltage switching (ZVS), the zero-voltage-derivative switching (ZVDS), the zero-current switching (ZCS) conditions are satisfied) with a duty ratio D =0.5 are presented. In the proposed design method, a new design parameter K called the slope of switch current (when the switch turns off) is introduced for defining the suboptimum degree and the distance from the optimum condition. By using the design method of the soft switching resonant inverter, the third harmonic filter circuit is innovatively introduced to reduce the current flowing through the parallel capacitor of the main circuit, and greatly reduce the peak switching voltage of the main circuit and auxiliary circuit. And the circuit waveforms and design equations can be derived in detail. Compared with the conventional Class-E M inverter, the proposed inverter can offer the much lower peak switching voltage and higher efficiency. To verify the validity of the proposed method, a Class-E M /F 3 inverter operating at 1MHz is designed using the IRFZ24N transistor. The experimental results show that the output power of the new inverter is 15.138W, the efficiency reaches 96.4%, and the peak switching voltage of the main circuit and auxiliary circuit is reduced by 29.3% and 15.6%, respectively. The PSpice-simulation results and the experimental measurement results of the designed inverter are agreed with the analytical results, which verified the effectiveness of the proposed design method. INDEX TERMSClass-E M /F 3 inverter, suboptimum, low peak switching voltage, high efficiency, ZVS, ZVDS, ZCS.

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“…To combat this problem, the authors in [15] suggested increasing the input voltage; however, this may lead to device breakdown and lower operating efficiencies due to the excessive heat generated. In [16][17][18][19][20][21] the authors proposed the use of lossy, complex and bulky additional components and also power-consuming active devices for feedback and communications to achieve constant output voltage. Further, the authors in [22,23] suggested a non-radiative magnetic coupling approach to deliver power more efficiently; but the effective transfer range was basically restricted to one coil diameter unless relay resonators were adopted [24].…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis model of a class E ² converter for low power wireless charging links

Bati

Luk

Aldhaher

et al. 2019

IET Circuits, Devices & Systems

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A dynamic response analysis model of a Class E 2 converter for wireless power transfer applications is presented. The converter operates at 200 kHz and consists of an induction link with its primary coil driven by a class E inverter and the secondary coil with a voltage-driven class E synchronous rectifier. A seventh-order linear time invariant state-space model is used to obtain the eigenvalues of the system for the four modes resulting from the operation of the converter switches. A participation factor for the four modes is used to find the actual operating point dominant poles for the system response. A dynamic analysis is carried out to investigate the effect of changing the separation distance between the two coils, based on converter performance and the changes required of some circuit parameters to achieve optimum efficiency and stability. The results show good performance in terms of efficiency (90-98%) and maintenance of constant output voltage with dynamic change of capacitance in the inverter. An experiment with coils of the dimension of 53 × 43 × 6 mm 3 operating at a resonance frequency of 200 kHz, was created to verify the proposed mathematical model and both were found to be in excellent agreement.

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Inductively coupled wireless power transfer with class-E<sup>2</sup> DC-DC converter

Cited by 16 publications

References 9 publications

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

Analysis and Design of the Suboptimum Class-E_M/F₃ Resonant Inverter

Dynamic analysis model of a class E ² converter for low power wireless charging links

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Inductively coupled wireless power transfer with class-E<sup>2</sup> DC-DC converter

Cited by 16 publications

References 9 publications

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

A Review of Wireless Power Transfer Systems for Electric Vehicle Battery Charging with a Focus on Inductive Coupling

Analysis and Design of the Suboptimum Class-EM/F3 Resonant Inverter

Dynamic analysis model of a class E 2 converter for low power wireless charging links

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Analysis and Design of the Suboptimum Class-E_M/F₃ Resonant Inverter

Dynamic analysis model of a class E ² converter for low power wireless charging links