A systematic comparison of hard- and soft-switching topologies for inductive power transfer systems

Diekhans, Tobias; Stewing, Felix; Engelmann, Georges; Hoek, Hauke van; Doncker, Rik W. De

doi:10.1109/edpc.2014.6984420

Cited by 26 publications

(13 citation statements)

References 18 publications

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“…The core losses of the contactless transformer are modeled based on the empirical Steinmetz equation [13], [19]. The Steinmetz equation can be applied because the excitation of the ferrite core is nearly sinusoidal without premagnetization of the core material.…”

Section: Simulation Modelsmentioning

confidence: 99%

“…The eddy current losses in the aluminum shield are modeled based on the assumption that the thickness of the shield is much higher than the skin depth of the induced eddy currents (inductance-limited case) [13], [21]. The conductivity of aluminum is set to σ = 30 MS/m.…”

Section: Simulation Modelsmentioning

confidence: 99%

“…Power control is typically performed on the primary side either by using a phase shifted full bridge or by regulating the input DClink voltage allowing the full bridge to operate under softswitching conditions. In a separate publication, a detailed simulative topology comparison between different series-series compensated hard-and soft-switching topologies is going to be performed [13].…”

Section: Introductionmentioning

confidence: 99%

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A dual-side controlled inductive power transfer system optimized for large coupling factor variations

Diekhans

Doncker

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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In this work, a 3 kW inductive power transfer system is investigated, specifically intended for contactless vehicle charging. A series-series compensated topology with dual-side power control and a corresponding control strategy is proposed to significantly increase the overall efficiency, especially for systems with a large coupling factor variation and in partial load mode.A hardware prototype is built up and a peak DC-to-DC efficiency of 95.8 % at 100 mm air gap and a minimal efficiency of 92.1 % at 170 mm air gap is measured, including the power electronic components. The partial load efficiency at 500 W output power is still as high as 90.6 % at 135 mm air gap.All relevant loss mechanisms are modeled and the system is designed using a multi-objective optimization approach. An operating frequency of 35 kHz was found to be the optimal tradeoff between the switching losses in the power electronics and the losses in the contactless transformer. Detailed measurement results are indicated showing an excellent agreement with the implemented simulation models.

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Section: Simulation Modelsmentioning

confidence: 99%

Section: Simulation Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A dual-side controlled inductive power transfer system optimized for large coupling factor variations

Diekhans

Doncker

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

Self Cite

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“…The reduction of the effective impedance is equivalent to the effect of an additional DC/DC upconversion stage, but there is only minimal hardware effort needed to realize the effect. This promising topology has been investigated for low power levels and has proven to yield significant advantages over other topologies with single-side control [6]. Furthermore, an adaptation to the expected standard frequency has been developed that combines minimal hardware effort with minimized switching losses.…”

Section: Impedance Adaption To the Batterymentioning

confidence: 99%

“…The first approach uses pulse width modulation at the fundamental transmission frequency and is described in detail in [6]. While the effort for the control circuit is quite low in this case, switching losses of the semiconductors can contribute significantly to the overall system losses.…”

Section: Impedance Adaption To the Batterymentioning

confidence: 99%

High efficient, compact vehicle power electronics for 22kW inductive charging

Schumann

Blum

Eckhardt

et al. 2014

2014 4th International Electric Drives Production Conference (EDPC)

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This paper presents an automotive suitable power electronics for inductive energy transfer of up to 22kW within a box volume of 3.5l. The compact layout and an optimized system topology allow the realization of rectifier and reactive current compensation with a high efficiency of around 98%. The specific layout takes into account cooling of the resonance capacitors as well as of the rectifier. The automotive environment requires failsafe functionality which is independent of the wireless data transfer to the primary side. The hardware is dimensioned and prepared for realizing an additional secondary side power control. Thus, the optimal electrical working point of the energy transfer can be adjusted and overall system losses can be reduced.

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An optimal load indirect matching method without parameter identification and system efficiency optimization

Qiu

Sun

Rong

et al. 2023

Sci Rep

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In some wireless charging applications where the coil spacing varies in real time, such as UAV, electric boat and tram, etc., the traditional direct impedance matching method is difficult to identify the mutual inductance timely and accurately, thus affecting the efficiency optimization effect of the system. In this paper, an indirect impedance matching method without parameter identification is proposed, this method is based on the characteristic that the optimal voltage gain of the resonator is only related to its inherent parameters, and impedance matching can be achieved by controlling the voltage gain in real time. To further improve the efficiency of the system, a single-sided detuning design method is used to achieve soft switching of the inverter. Based on the optimal voltage gain expression derived by using both the indirect impedance matching method and the single-sided detuning design method, a compound control strategy for a series-series-compensated topology with dual-side power control is proposed to improve efficiency and stabilize the output voltage. A hardware prototype is built and a peak DC-to-DC efficiency with the optimal output resistance RL at about 28.9 Ω is 91.58%. When the output resistance RL is 100 Ω, the efficiency improved by 7% after using the proposed strategy.

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A systematic comparison of hard- and soft-switching topologies for inductive power transfer systems

Cited by 26 publications

References 18 publications

A dual-side controlled inductive power transfer system optimized for large coupling factor variations

A dual-side controlled inductive power transfer system optimized for large coupling factor variations

High efficient, compact vehicle power electronics for 22kW inductive charging

An optimal load indirect matching method without parameter identification and system efficiency optimization

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