A Converter Based on Independently Inductive Energy Injection and Free Resonance for Wireless Energy Transfer

Chen, Lin; Hong, Jianfeng; Guan, Mingjie; Lin, Zaifa; Chen, Wenxiang

doi:10.3390/en12183467

Cited by 3 publications

(7 citation statements)

References 34 publications

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“…As there is no switching action to trigger the stage transition, the switching action can be advanced of the stage transition and becomes flexible on the time. Therefore, by taking advantage of this automatic stage transition between the free resonance stage and the energy injection stage, the problem in determining state transition time in literature [25] is solved.…”

Section: State Transition Analysismentioning

confidence: 99%

“…A pair of coil pads was used as the loosely coupled transformer. The detailed design of the coil pads has been shown in literature [25]. The inductance of the pads is 640 μH, and the mutual inductance between the pads varies with the air gap.…”

Section: The Experimental Prototypementioning

confidence: 99%

“…In our previous work [25], an independent inductance energy injection and free resonance (IIEIFR) converter and its control strategy for the IPT system were proposed. By this converter topology and the control strategy, the converter can be decoupled from the resonance network.…”

Section: Introductionmentioning

confidence: 99%

“…The system can avoid the problem of frequency detuning, and the power can be controlled by adjusting the energy injection time. However, the designed system in literature [25] still has some problems. One problem is that the transition moments between two stages are determined by the measured the primary capacitor voltage.…”

Section: Introductionmentioning

confidence: 99%

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A Converter with Automatic Stage Transition Control for Inductive Power Transfer

et al. 2020

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An automatic stage transition converter for an inductive power transfer system is presented in this paper. An effective control strategy with two working stages of independent energy injection stage and free resonance stage is employed in the proposed converter. With the automatic stage transition strategy, when the frequency of the resonance network changes, the ending time of the free resonance stage is automatically determined. At the same time, the phase angle of the free resonance stage is automatically set as half a resonant cycle. As the stage transition is not triggered by the switches, the switch motion can be executed in advance of the transition moments. Time margins are offered for every switch in the converter, which make the switching moments of the switches flexible and the control simple. Another feature of this converter is that during the energy injection stage, the energy is injected into the inductor independently. Therefore, the input power can be easily regulated by adjusting the energy injection time. A prototype for the converter and the inductive power transfer system was implemented experimentally. From the experimental results, the automatic stage transition and power regulation capability of the proposed converter are verified. The switches all operated at the soft switch condition. When the energy injection time was adjusted from 10 μs to 25 μs, the output power changed from 143 W to 740 W.

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Section: State Transition Analysismentioning

confidence: 99%

Section: The Experimental Prototypementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Converter with Automatic Stage Transition Control for Inductive Power Transfer

et al. 2020

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“…The independent power injection and free resonance wireless power transfer (IPIFR-WPT) system uses a novel and unique topology structure that separates the switching converters from the resonant tanks [17,18]. The characteristic of this circuit structure is that the power injection process and the free resonance process are independent so that the converter and the resonance network are completely decoupled.…”

Section: Introductionmentioning

confidence: 99%

A Six-Switch Mode Decoupled Wireless Power Transfer System with Dynamic Parameter Self-Adaption

Luo

Hong

et al. 2023

Electronics

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For the fully resonant wireless power transfer (WPT) system, the high coupling of the converter and the resonant network introduced many problems, such as frequency splitting, the power curve peak limit, and the strict switch strategy. To solve these problems, this paper proposed a new six-switch topology based on the full–-bridge converter. With the unique structures containing two capacitor-isolated switches and a source-isolated diode, the system decouples the converter and the resonant network, and its modes have been decoupled, called the independent power injection and free resonance WPT (IPIFR–WPT) system. The capacitor-isolated switches and the source-isolated diode make the converter operate only when the voltage on the primary capacitor is equal to the source voltage, and the source will be isolated by the diode when the capacitor voltage is great than the source, which provides a wide time margin for the switches of the converter to turn on in advance. In this margin, the operation point is self-determined the same whenever the switches turn on so that the system’s performance is consistent. Based on this characteristic, the system can self-adapt a dynamic change in system parameters, with at least 15% tolerance for the coupling coefficient and 14% for the load resistance.

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Power Injection and Free Resonance Decoupled Wireless Power Transfer System with Double-Switch

Wu,

Luo,

Tang

et al. 2023

Electronics

Self Cite

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This article presents a type of power injection and free resonance decoupled wireless power transfer (WPT) system, the double-switch independent power injection and free resonance wireless power transfer (IPIFR-WPT) system working in CCM. Based on the stroboscopic mapping model, the theoretical results show that the operation point of the proposed WPT system is determined by itself instead of the switching control strategy. Specifically, once the voltage on the primary capacitance does not decrease to the input voltage in the free-resonance process, the diode in series would not turn on and the system would not switch to the power injection process. Therefore, there is a wide soft-switching margin to ensure the system operating in soft-switching states. Another characteristic of the proposed WPT system is the monotonicity between output power and operation cycle, which presents a simple power control method. And since the soft-switching margin may have intersection under dynamic coupling coefficient, the proposed system maintains soft-switching states with a fixed switching strategy and presents advantage to resist the dynamic change of coupling coefficient. All the characteristics of the proposed WPT system mentioned above have been verified in both theory and experiment.

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A Converter Based on Independently Inductive Energy Injection and Free Resonance for Wireless Energy Transfer

Cited by 3 publications

References 34 publications

A Converter with Automatic Stage Transition Control for Inductive Power Transfer

A Converter with Automatic Stage Transition Control for Inductive Power Transfer

A Six-Switch Mode Decoupled Wireless Power Transfer System with Dynamic Parameter Self-Adaption

Power Injection and Free Resonance Decoupled Wireless Power Transfer System with Double-Switch

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