Coil-Capacitor Circuit Design of a Transcutaneous Energy Transmission System to Deliver Stable Electric Power

Choi, Sun Ha; Lee, Min-Hyong

doi:10.4218/etrij.08.0108.0321

Cited by 15 publications

(9 citation statements)

References 11 publications

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“…Although various series and parallel resonant topologies have been studied with different tuning methods to improve the system performance, the optimal tuning capacitors to obtain the maximum potential power transfer capability remain an unsolved problem [4,5]. Choi and Lee reported work on adding a parallel tuning capacitor to a series-tuned TET system [6], but the purpose was to stabilise the output voltage and improve the system power efficiency. This Letter presents a new method for determining the optimal capacitor values of a voltage-fed series-tuned TET system for achieving maximum power transfer.…”

mentioning

confidence: 99%

Determining optimal tuning capacitor values of TET system for achieving maximum power transfer

Malpas

et al. 2009

Electron. Lett.

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Optimal tuning capacitor values corresponding to the maximum power transfer of a voltage-fed series-tuned transcutaneous energy transfer (TET) system are derived. The theoretical analysis is verified by experimental results. The maximum power transfer capacity can be three times greater compared to the traditional method, which tunes the capacitor at the nominal resonant frequency without considering the mutual inductance effect. These results are useful to enable an existing seriestuned TET system to meet short-term high-power demands where efficiency is not a key factor.Introduction: Transcutaneous energy transfer (TET) systems are designed to deliver power from a primary source to a secondary implantable device over relatively large airgaps via time-varying magnetic fields. It eliminates the serious infection risk associated with direct cable connections through the skin and these advantages were recognised decades ago [1]. The power transfer of a TET system relies on a resonant circuit at both the primary and secondary sides to compensate for low magnetic coupling between an external coil and an internal pickup coil [2]. Traditionally, the value of each resonant capacitor is selected based on the self inductance of the primary and secondary coils and the nominal resonant frequency [2,3]. However, owing to the mutual coupling between the circuits, such a practice does not necessarily lead to the maximum power transfer at a system level. Although various series and parallel resonant topologies have been studied with different tuning methods to improve the system performance, the optimal tuning capacitors to obtain the maximum potential power transfer capability remain an unsolved problem [4,5]. Choi and Lee reported work on adding a parallel tuning capacitor to a series-tuned TET system [6], but the purpose was to stabilise the output voltage and improve the system power efficiency. This Letter presents a new method for determining the optimal capacitor values of a voltage-fed series-tuned TET system for achieving maximum power transfer.

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confidence: 99%

Determining optimal tuning capacitor values of TET system for achieving maximum power transfer

Malpas

et al. 2009

Electron. Lett.

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“…This attitude may increase the number of referrals for LVAD therapy with potential increase in demand that may reduce the current cost of these devices. The development of totally implantable pumps powered by a trans-cutaneous external transmission system (TETS) technology with improved battery life is likely to make this therapy even more ergonomic and socially acceptable 22,23) with the important benefit of eliminating abdominal driveline infection, which has been a significant limitation in our group of patients. In spite of the limitations of LVAD therapy, our analysis has shown consistent significant improvements in haemodynamic parameters in group I and group II during LVAD support.…”

Section: Discussionmentioning

confidence: 99%

A UK Single Centre Retrospective Analysis of the Relationship between Haemodynamic Changes and Outcome in Patients Undergoing Prolonged Left Ventricular Assist Device Support

Capoccia

Bowles

Sabashnikov

et al. 2015

ATCS

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IntroductionAlthough heart transplantation remains the gold standard for the treatment of end-stage heart failure with an average 2-year survival rate of 80%, 1) its epidemiological impact is limited by organ availability. 2) Over the last 5 years, rotary left ventricular assist devices (LVADs) have been used increasingly either as a bridge to transplant or for permanent support. In spite of their clinical efficacy, LVADs remain associated with serious complications which compromise outcome. However, the association between changes in haemodynamic parameters during support and outcome remains inadequately Purpose: Despite their efficacy, LVADs remain associated with serious complications. The relationship between haemodynamic changes during support and outcome remains inadequately characterised. This association was investigated in LVAD recipients undergoing prolonged support. Methods: Forty patients receiving LVAD therapy for >2 years were reviewed retrospectively (mean support duration was 38.62 ± 15.28). Pre-and on-LVAD haemodynamic data were assessed in three groups: (1) those receiving ongoing support (n = 24); (2) those who underwent cardiac transplantation (n = 4); (3) those who died during support (n = 12). Results: For group 1 and 2, LVAD support achieved a decrease in mean PAP, mean PCWP, TPG, and PVR and an increase in thermodilution blood flow (TBF) with significance at ≤5% level. For group 3, there were non-significant changes in TPG and PVR at the 5% level but for mean PAP, mean PCWP, and TBF the changes were similar to Groups 1 and 2 with significance at ≤5% level. Aggregated data from all three groups showed a 58% increase in TBF on LVAD support. Conclusion: Highly significant and favourable haemodynamic changes were found. However, group 3 did not undergo decrease in TPG and PVR possibly because of suboptimal LVAD flow, right heart dysfunction and unavoidable prolongation of support.

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“…It is inversely proportional to R(resistance). High Q is required to obtain longer wireless power distance [1], [2].…”

Section: B Coupled Magnetic Resonatorsmentioning

confidence: 99%

“…Three methods for wireless power transmission are generally known. The first method is the magnetic induction [2], the second is the antenna method [3], and the third is the coupled magnetic resonance method [1]. In these, the wireless power transmission system using the magnetic resonance is suitable at the middle range wireless power transmission [4] compare with the methods using the magnetic induction or antenna method.…”

Section: Introductionmentioning

confidence: 99%

5W wireless power transmission system with coupled magnetic resonance

Kim

Cho

Moon

et al. 2013

2013 5th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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In this paper, a 1.8MHz and 5W wireless power transmission system for a wireless smart storage using coupled magnetic resonances is presented. The proposed wireless power transmission system consists of the 20W class-F power transmitter, two magnetic resonance couplers and 50W full bridge diode rectifier receiver. The transmitter is composed of DDS(Direct Digital Synthesizer) block, class-F power amplifier and control block to implement the frequency and power setting by embedded MCU. Two magnetic resonance couplers are designed with a small spiral resonator. The diameter size of the transmitting spiral coil is 30cm and the receiving coil's size is 7cm. The receiver is composed of full bridge diode rectifier, overvoltage protection (OVP) with active dummy load, DC to DC converter. The power consumption of the wireless smart storage is about 5W and the total power efficiency of this system is about 45%.

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Coil-Capacitor Circuit Design of a Transcutaneous Energy Transmission System to Deliver Stable Electric Power

Cited by 15 publications

References 11 publications

Determining optimal tuning capacitor values of TET system for achieving maximum power transfer

Determining optimal tuning capacitor values of TET system for achieving maximum power transfer

A UK Single Centre Retrospective Analysis of the Relationship between Haemodynamic Changes and Outcome in Patients Undergoing Prolonged Left Ventricular Assist Device Support

5W wireless power transmission system with coupled magnetic resonance

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