6.78 MHz self-oscillating parallel resonant converter based on GaN technology

Bonache-Samaniego, Ricardo; Olalla, Carlos; Martínez-Salamero, L.; Maksimović, Dragan

doi:10.1109/apec.2017.7930912

Cited by 11 publications

(9 citation statements)

References 13 publications

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“…Instead of the class-E inverter, recent rapid evolution of large bandgap semiconductor switches (Silicon-carbide (SiC) and Gallium-nitride (GaN) Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET)) and their gate drivers have enabled significant advancement of radio-frequency halfand full-bridge switch-mode inverters. Multiple papers reported on GaN-based full-bridge inverters for WPT systems in 2017 [24][25][26]. Zhao et al proposed a multi-frequency pulse-width-modulation (MFPWM) scheme which was implemented using a GaN-based full-bridge inverter [24].…”

Section: Transmitter and Receiver Coil Designmentioning

confidence: 99%

6.78-MHz, 50-W Wireless Power Supply Over a 60-cm Distance Using a GaN-Based Full-Bridge Inverter

Lee

Kim

2019

Energies

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An inductive wireless power transfer system is proposed as a power supply for an on-line monitoring system for an overhead catenary. Because of the high voltage (25 kVrms) applied to the catenary, galvanic isolation was required to supply power to the attached monitoring system. The proposed wireless power system was able to transmit 50 W over a distance of 60 cm at 6.78 MHz. Design methodologies for the transmitter and the receiver coils, 6.78-MHz GaN-based full-bridge inverter, and rectifier are proposed in this paper. Pareto optimality, a multi-objective optimization technique, was used to determine optimal solutions in terms of efficiency and copper usage. A 100-W, 6.78-MHz full-bridge inverter was developed using 100 V, 35 A, E-HEMT GaN MOSFETs. Because of the high operating frequency, two factors were considered in the design of the full-bridge inverter, (1) close placement of the gate driver and the switch to minimize parasitic inductance and the resulting fluctuation of the drive signal and (2) effective heat dissipation from the switches and gate drivers for a high power rating. In addition, a full-wave rectifier was built using Schottky barrier diodes with a reverse recovery time of a few tens of nano-seconds. The developed wireless power system was experimentally evaluated. The measured coil-to-coil efficiency was 77%, and the measured efficiencies of the inverter and the rectifier were 92% and 93%, respectively. The overall system efficiency was 57% for a transfer of 47 W. Finally, the dependences of the efficiency on the distance, operating frequency, and load were evaluated.

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Section: Transmitter and Receiver Coil Designmentioning

confidence: 99%

6.78-MHz, 50-W Wireless Power Supply Over a 60-cm Distance Using a GaN-Based Full-Bridge Inverter

Lee

Kim

2019

Energies

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“…Proof For any value of parameter Q, system (1)-(2) can be reduced to (5)- (6). If Q > 1/2, the parameter γ in (7) is well defined.…”

Section: Canonical Formsmentioning

confidence: 99%

“…As a consequence, a renewed interest has emerged in resonant conversion. In particular, resonant inverters have recently gained more popularity in emerging applications such as wireless power transfer [4][5][6], battery charging in electrical vehicles [7], induction heating [8] and powering high intensity discharge lamps [9], among others.…”

Section: Introductionmentioning

confidence: 99%

Limit cycle bifurcations in resonant LC power inverters under zero current switching strategy

Benadero

Ponce²,

Aroudi

et al. 2017

Nonlinear Dyn

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The dynamics of a DC-AC self-oscillating LC resonant inverter with a zero current switching strategy is considered in this paper. A model that includes both the series and the parallel topologies and accounts for parasitic resistances in the energy storage components is used. It is found that only two reduced parameters are needed to unfold the bifurcation set of this extended system: one is related to the quality factor of the LC resonant tank, and the other accounts for the balance between serial and parallel losses. Through a rigorous mathematical study, a complete description of the bifurcation set is obtained and the parameter regions where the inverter can work properly is emphasized.Postprint (author's final draft

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“…Therefore, two standards were created; Qi [1] and AirFuel [2]. Research activities, addressing the lower frequency (87 -205 kHz) Qi standard [3]- [7] and the higher frequency (6.78 MHz) AirFuel standard [8]- [18], grew as well. Some work [19], [20] are targeting both standards and other work [21], [22] reported operation outside those standards.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore this work focuses on the AirFuel standard. Gallium nitride (GaN) devices are used in [12], [15], [18] to reduce switching losses on the Tx side. Synchronous rectifiers, typically used in high power applications [23], [24], address the conduction losses on the Rx side in [3], [7], [13].…”

Section: Introductionmentioning

confidence: 99%

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

Jensen

Spliid

Hertel

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standards, AirFuel and Qi, exist to support compatibility between devices. This work is focusing on the AirFuel standard, as it is operating at a higher frequency (6.78 MHz), than the Qi standard, and therefore allows smaller passive components, including the coupling coils. Whereas gallium-nitride (GaN) devices are being widely used on the transmitter (Tx) side, this work uses low voltage GaN transistors on the receiver (Rx) side to allow synchronous rectification and soft switching, thereby achieving high efficiency. After analyzing adequate Class-DE rectifier topologies, a Class-DE full-bridge 5 W rectifier using 15 V GaN transistors are designed and implemented. The experimental results show an efficiency above 80 % over a wide operating range and a peak efficiency of 89 %, at an arbitrary alignment of Tx and Rx coils with 3 cm distance between them.

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6.78 MHz self-oscillating parallel resonant converter based on GaN technology

Cited by 11 publications

References 13 publications

6.78-MHz, 50-W Wireless Power Supply Over a 60-cm Distance Using a GaN-Based Full-Bridge Inverter

6.78-MHz, 50-W Wireless Power Supply Over a 60-cm Distance Using a GaN-Based Full-Bridge Inverter

Limit cycle bifurcations in resonant LC power inverters under zero current switching strategy

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

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