An Autonomous Impedance Adaptation Strategy for Wireless Power Transfer System Using Phase-Controlled Switched Capacitors

Shui, Hengqi; Yu, Dongsheng; Yu, Shenglong; Iu, Herbert Ho-Ching; Fernando, Tyrone; Cheng, He

doi:10.1109/jestpe.2019.2960878

Cited by 16 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [8][9], various inductance expressions based on curve fitting or closed formula of inductance design experience have been mentioned to express spiral inductance value. For square spiral structure, it can be summarized as follows:…”

Section: Analysis Of Planar Spiral Inductorsmentioning

confidence: 99%

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Wang

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Due to environmental interference, device aging, and the strict requirements for the relative position of the transceiver coil during charging, we always hope that the output voltage and power can remain stable when the transmission distance of the transmitting and receiving coils changes in the largest range possible. However, once the relative position of the transceiver coil of the traditional linear magnetic coupling resonance WPT system changes, that is, when the transmission distance is not optimal, the transmission performance of the system will be seriously degraded. In practical applications, the charging equipment inevitably moves, and the harsh transmission conditions limit the wide application of WPT technology. To solve this problem, based on the nonlinear characteristics presented by the nonlinear Duffing resonance model, this paper proposes to use a reverse series varactor at the receiving end by adjusting the reverse bias voltage of the varactor. This method compensates for the transmission performance attenuation caused by the change of the coupling coefficient of the transceiver coil to maintain a high level of transmission performance when the relative distance between the transceiver coils is as large as possible.

show abstract

Section: Analysis Of Planar Spiral Inductorsmentioning

confidence: 99%

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Wang

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…From Equation ( 20), for given R LT and Q LT , Re½Z f f ractional a uto is only dependent on the order α, so the change of frequency would also have no influence on the transfer efficiency. In addition, different orders produce different Re½Z f f ractional a uto , and the order can be can be designed by Equation (20) according to the required Re½Z f f ractional a uto .…”

Section: Comparison Based On Analytic Analysismentioning

confidence: 99%

“…Moreover, for integer-order WPT systems, the reflected impedance would vary with the change of the coupling coefficient and resonant frequency. [19][20][21] However, the properties of the reflected impedance in fractional-order magnetic coupled WPT systems are unknown. Therefore, this paper analyzes the reflected impedance characteristics of fractional-order WPT systems.…”

Section: Introductionmentioning

confidence: 99%

“…The literature 18 shows that the transfer efficiency of WPT systems depends on reflected impedance. Moreover, for integer‐order WPT systems, the reflected impedance would vary with the change of the coupling coefficient and resonant frequency 19–21 . However, the properties of the reflected impedance in fractional‐order magnetic coupled WPT systems are unknown.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative analysis of reflected impedance between fractional‐order and integer‐order wireless power transfer systems

Zhao

Yang

Wang

et al. 2022

Circuit Theory & Apps

View full text Add to dashboard Cite

In a magnetic coupled wireless power transfer (WPT) system, reflected impedance is the equivalent impedance reflected from receiver to transmitter, playing an important role in transfer efficiency. However, the study on the reflected impedance of fractional-order magnetic coupled WPT systems is lacking. Therefore, this paper analyzes the reflected impedance characteristics of fractional-order WPT systems. Based on circuit theory, comparative investigations about the reflected impedance of fractional-order and integer-order WPT systems are performed. It is demonstrated that the reflected impedance of the fractional-order WPT system has a stronger anti-interference ability against the shift of coupling coefficient and resonant frequency than the integer-order WPT system. The experimental results verify the correctness of the theoretical analysis.

show abstract

“…There are a number of methods to retune the primary resonant tank including inductance variations through mechanical core movement [5–7], magnetic saturation [8–11], or switched inductor [12–15]; but capacitance variations through continuously variable capacitor or switched capacitor (SC) [16–36] are most common due to their small size and low price relative to inductors. The continuous variable tuning inductor or capacitor method is widely used as it allows cycle‐by‐cycle compensation for fast transient loads or impedance variation.…”

Section: Introductionmentioning

confidence: 99%

Retuning high Q inductive power transfer systems at MHz frequencies: a switched capacitor design method incorporatingC_OSS

Jin

Gallichan

Budgett

et al. 2023

IET Power Electronics

View full text Add to dashboard Cite

High Q coils are required by inductive power transfer (IPT) links to attain reasonable levels of power transfer especially for loosely coupled links such as those used for small, deeply implanted medical devices. However, the high Q feature makes IPT systems strongly dependent on operating frequency which must be matched in the primary and secondary resonant tanks. Consequently, power transfer is sensitive to resonant frequency shifts due to component aging and environmental factors. Here, a switched capacitor (SC) network is developed to maintain tight matching and enhance system robustness. The combination of high voltage and high frequency required to achieve power transfer to deeply implanted devices makes the SC network design challenging. High frequencies require small tuning capacitance and high voltage requires MOSFETS with large output capacitance (COSS) resulting in COSS having a significant effect on tuning frequency. This paper proposes a parameter design method incorporating COSS to eliminate the uncertainty of voltage related COSS. In the experiment, the SC network broadens the effective bandwidth from 37 to 585 kHz at the centre frequency of 6.50 MHz. Across a frequency sweep, the worst case in transfer power drop is −0.43 dB, which demonstrates sufficient immunity to parameter deviations.

show abstract

An Autonomous Impedance Adaptation Strategy for Wireless Power Transfer System Using Phase-Controlled Switched Capacitors

Cited by 16 publications

References 23 publications

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Comparative analysis of reflected impedance between fractional‐order and integer‐order wireless power transfer systems

Retuning high Q inductive power transfer systems at MHz frequencies: a switched capacitor design method incorporatingC_OSS

Contact Info

Product

Resources

About

An Autonomous Impedance Adaptation Strategy for Wireless Power Transfer System Using Phase-Controlled Switched Capacitors

Cited by 16 publications

References 23 publications

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Research on Wireless Energy Transmission Systems of Coupled Nonlinear Resonator

Comparative analysis of reflected impedance between fractional‐order and integer‐order wireless power transfer systems

Retuning high Q inductive power transfer systems at MHz frequencies: a switched capacitor design method incorporatingCOSS

Contact Info

Product

Resources

About

Retuning high Q inductive power transfer systems at MHz frequencies: a switched capacitor design method incorporatingC_OSS