Phase-shift and amplitude control for an active rectifier to maximize the efficiency and extracted power of a Wireless Power Transfer system

Berger, Andreas; Agostinelli, Matteo; Vesti, S.; Oliver, J. A.; Cobos, J.A.; Huemer, Mario

doi:10.1109/apec.2015.7104564

Cited by 22 publications

(18 citation statements)

References 14 publications

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“…Any deviation from soft-switching would result in large switching losses due to the added capacitance, which is undesired. With the added capacitance the input current amplitude is 6.28 A, see (4). In the simulation, it is found that having only the drainsource capacitance of the EPC2040 results in an input current amplitude of 3.14 A, for both half-bridges.…”

Section: A Transistor Fom Analysismentioning

confidence: 92%

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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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Section: A Transistor Fom Analysismentioning

confidence: 92%

“…TOPOLOGY SELECTION Synchronous rectification for WPT is being researched, as it is a potential way to overcome the losses associated with diodes, which are currently used in WPT systems. Other work such as [3], [4], [7], [13], [14], [26]- [28] look into ways to implement and optimize control schemes for synchronous rectifiers.…”

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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“…However, this method does not allow to separately control the resistive and reactive part of the equivalent load impedance, whereas in the proposed concept the overall impedance is controlled. By defining the phase-shift ϕ as the angle between the first harmonic of the input current I L and the voltage V L of the active rectifier we derived an analytical expression for the equivalent input impedance of the active rectifier [24]:…”

Section: B the Proposed Conceptmentioning

confidence: 99%

“…Fig. 7b compares the simulations according to (24) and the experimental results of the duty cycle D as a function of the output power P out . Fig.…”

Section: B Optimization Of the Phase-shift And Rectified Voltagementioning

confidence: 99%

“…The presented methodology is based on controlling both the phaseshift of the active rectifier and its output voltage level. This work is an extension to the concept we proposed in [24], where only a simplified system has been investigated and a voltage source at the output of the rectifier is used to set a desired voltage level. In contrast, this paper investigates a complete wireless charging system, including a DC-DC converter to regulate the rectified voltage and a battery as load of the system.…”

Section: Introductionmentioning

confidence: 99%

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A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

Berger

Agostinelli

Vesti

et al. 2015

IEEE Trans. Power Electron.

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282

102

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Wireless Power Transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current WPT systems. This work presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in non-resonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phaseshift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a DC-DC converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-ofthe-art solutions in terms of efficiency and extractable power.

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Wireless Power Transfer: Principles and Applications

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Phase-shift and amplitude control for an active rectifier to maximize the efficiency and extracted power of a Wireless Power Transfer system

Cited by 22 publications

References 14 publications

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

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

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

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