A Self-Resonant Two-Coil Wireless Power Transfer System Using Open Bifilar Coils

Miranda, Caio M. de; Pichorim, Sérgio Francisco

doi:10.1109/tcsii.2016.2595402

Cited by 36 publications

(20 citation statements)

References 16 publications

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“…An alternative configuration of the bifilar coil as a solenoid winding was presented in recent work, 16,17 where in this case, the end of the first wire is not connected to the beginning of the second, ie, an open-bifilar coil. In recent work, we have demonstrated that the open-bifilar coil could be used for WPT applications as an innovative two-coil SRF WPT system, ie, avoiding the use of capacitors to obtain resonance and transmit power in an efficient way.…”

Section: Introductionmentioning

confidence: 99%

“…In recent work, we have demonstrated that the open-bifilar coil could be used for WPT applications as an innovative two-coil SRF WPT system, ie, avoiding the use of capacitors to obtain resonance and transmit power in an efficient way. 16 In this way, by avoiding the use of a real capacitor and due to a smaller SRF, the bifilar coils would also decrease the circuitry complexity of WPT systems and also help to meet low-frequency requirements of some systems, as in electric-vehicle applications for example. Also, since these coils behave as a series RLC circuit at resonance, a practical series-series compensation, which does not have its resonant frequency changed by other electrical parameters, 7 can be used in both transmitter and receiver sides.…”

Section: Introductionmentioning

confidence: 99%

“…In recent work, we have demonstrated that the open-bifilar coil could be used for WPT applications as an innovative two-coil SRF WPT system, ie, avoiding the use of capacitors to obtain resonance and transmit power in an efficient way. In this system, the open-bifilar coils are used as a transmitter and receiver coil, with the advantage of behaving as a series RLC circuit with minimum impedance at its SRF, 16,17 thus allowing high currents to circulate in both coils. Also, since these coils behave as a series RLC circuit at resonance, a practical series-series compensation, which does not have its resonant frequency changed by other electrical parameters, 7 can be used in both transmitter and receiver sides.…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, it was also noticed that the SRF of this open-bifilar coil was also smaller than that of a conventional coil of the same dimensions. 16 In this way, by avoiding the use of a real capacitor and due to a smaller SRF, the bifilar coils would also decrease the circuitry complexity of WPT systems and also help to meet low-frequency requirements of some systems, as in electric-vehicle applications for example. 18 Moreover, in WPT systems, it is known that radiation losses increase with the frequency 12 ; thus, the bifilar coil can be an alternative since, with the same geometry, it exhibits a smaller SRF.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the self‐resonant frequency reduction of closed‐ and open‐bifilar coils

Miranda

Pichorim

2019

Circuit Theory & Apps

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In this work we present the electrical characterization of closed-and openbifilar solenoid coils by comparing their self-capacitance, self-inductance, and self-resonant frequency (SRF). The analysis is done by relating these parameters with those of a conventional solenoid coil with same dimensions and number of turns. It is shown that bifilar coils have a greater self-capacitance and lower SRF when compared with the respective conventional coil and that this relation can be expressed only in terms of the number of turns of the coils. Therefore, these components have a potential use in applications that need to avoid the use of a real capacitor and need to operate in a smaller resonant frequency, such as in wireless power transfer systems, for example. In a similar way, the self-inductances of closed-and open-bifilar coils are also compared with those of conventional coils with the same dimensions. It is also shown that the SRF of closed-and open-bifilar coils are approximately the same for practical values of the quality factor and that their impedance behaves as series and parallel RLC circuits. Practical experiments are conducted validating the developed theory.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In recent work, we have demonstrated that the open-bifilar coil could be used for WPT applications as an innovative two-coil SRF WPT system, ie, avoiding the use of capacitors to obtain resonance and transmit power in an efficient way. In this system, the open-bifilar coils are used as a transmitter and receiver coil, with the advantage of behaving as a series RLC circuit with minimum impedance at its SRF, 16,17 thus allowing high currents to circulate in both coils. Also, since these coils behave as a series RLC circuit at resonance, a practical series-series compensation, which does not have its resonant frequency changed by other electrical parameters, 7 can be used in both transmitter and receiver sides.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the self‐resonant frequency reduction of closed‐ and open‐bifilar coils

Miranda

Pichorim

2019

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…However, inductor and capacitor have limitation especially for high frequency application. As the operating frequency increases, capacitor introduces parasitic inductance [3]- [4], while inductor inherits parasitic capacitance [5]- [7], and the effect is more pronounce as the frequency approaching their self-resonant frequency. Hence, high-frequency applications demand capacitor and inductor with high self-resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

Development of VHF LC-Passive Filters for Multiband Transient Radio Telescope

Anwar

Islam

Misran

et al. 2017

IJAIT

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Filter is one of key module in a radio telescope system. This article present the development of VHF LC-passive filters meant to support a multiband antenna in a transient radio telescope system by reducing the bandwidth of each operating frequencies. The filters were developed by employing low-cost inductor and capacitor with low self-resonant frequency (SRF) and hence the characteristic are highly affected by the parasitic inductance of the capacitors and parasitic capacitance of the inductors. Therefore, general equation to develop an LC filters was no longer applicable in developing these filters. Nevertheless, three filters were successfully developed, operated at 38 MHz, 74 MHz and 152 MHz with relatively good quality factors up to of about 13. AcknowledgmentThe authors would like to thank Universiti Kebangsaan Malaysia for sponsoring this work.

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Fiber‐Based Miniature Strain Sensor with Fast Response and Low Hysteresis

Wang,

Qiu,

Zhang

et al. 2024

Adv Funct Materials

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Flexible and stretchable strain sensors are in high demand in sports performance monitoring, structural health monitoring, and biomedical applications. However, existing stretchable soft sensors, primarily based on soft polymer materials, often suffer from drawbacks, including high hysteresis, low durability, and delayed response. To overcome these limitations, a stretchable miniature fiber sensor comprised of a stretchable core tightly coiled with parallel conductive wires is introduced. This fiber sensor is flexible and stretchable while exhibiting low hysteresis, a remarkable theoretical resolution of 0.015%, a response time of <30 milliseconds, and excellent stability after extensive cycling tests of over 16 000 cycles. To understand and predict the capacitive sensor response of the proposed sensor, an analytical expression is derived and proved to have good agreements with both experimental results and numerical simulation. The potential of the strain sensor as a wearable device is demonstrated by embedding it into belts, gloves, and knee protectors. Additionally, the sensor can extend its applications beyond wearable devices, as demonstrated by its integration into bladder and life safety rope monitoring systems. The sensor is envisioned to have applications in the field of sports performance evaluations, health care monitoring, and structural safety assessments.

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A Self-Resonant Two-Coil Wireless Power Transfer System Using Open Bifilar Coils

Cited by 36 publications

References 16 publications

On the self‐resonant frequency reduction of closed‐ and open‐bifilar coils

On the self‐resonant frequency reduction of closed‐ and open‐bifilar coils

Development of VHF LC-Passive Filters for Multiband Transient Radio Telescope

Fiber‐Based Miniature Strain Sensor with Fast Response and Low Hysteresis

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