Wireless Power Transmission With Self-Regulated Output Voltage for Biomedical Implant

Ahn, Do-Seob; Hong, Songcheol

doi:10.1109/tie.2013.2273472

Cited by 269 publications

(83 citation statements)

References 30 publications

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“…As a result, numerical solutions (for example using Matlab) are needed. With both "t on " and "t off " available, T con can be calculated with (2).…”

Section: Theoretical Modeling and Analysismentioning

confidence: 99%

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Secondary Side Output Voltage Stabilization of an IPT System by Tuning/Detuning through a Serial Tuned DC Voltage-controlled Variable Capacitor

Tian¹,

Hu²,

Nguang³

2017

Journal of Power Electronics

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This paper proposes a method to stabilize the output voltage of the secondary side of an Inductive Power Transfer (IPT) system through tuning/detuning via a serial tuned DC Voltage-controlled Variable Capacitor (DVVC). The equivalent capacitance of the DVVC changes with the conduction period of a diode in the DVVC controlled by DC voltage. The output voltage of an IPT system can be made constant when this DVVC is used as a variable resonant capacitor combined with a PI controller generating DC control voltage according to the fluctuations of the output voltage. Since a passive diode instead of an active switch is used in the DVVC, there are no active switch driving problems such as a separate voltage source or gate drivers, which makes the DVVC especially advantageous when used at the secondary side of an IPT system. Moreover, since the equivalent capacitance of the DVVC can be controlled smoothly with a DC voltage and the passive diode generates less EMI than active switches, the DVVC has the potential to be used at much higher frequencies than traditional switch mode capacitors.

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“…As a result, numerical solutions (for example using Matlab) are needed. With both "t on " and "t off " available, T con can be calculated with (2).…”

Section: Theoretical Modeling and Analysismentioning

confidence: 99%

“…The output voltage of a wireless power transfer (WPT) system can be made constant by either primary or secondary side control [1], [2]. Since a separate communication channel is normally needed for primary side control [3]- [10], it is more straightforward to directly regulate the output voltage at the secondary side [11]- [18].…”

Section: Introductionmentioning

confidence: 99%

Secondary Side Output Voltage Stabilization of an IPT System by Tuning/Detuning through a Serial Tuned DC Voltage-controlled Variable Capacitor

Tian¹,

Hu²,

Nguang³

2017

Journal of Power Electronics

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show abstract

“…Therefore, WPT can be used for wireless battery charging for implantable biomedical devices [1][2][3][4] and portable electronics [5][6][7]. Moreover, even electric vehicles (or roadway-powered electric vehicles) can be wirelessly powered [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In two-coil WPT systems, there have been many efforts [1,2,[12][13][14][15][16][17] to regulate the output voltage under varying couplings and loads. [12][13][14][15] exhibited relatively constant output voltage under coupling variations.…”

Section: Introductionmentioning

confidence: 99%

“…In [1], using the transformer model, the voltage transfer function was obtained; an operating frequency corresponding to a particular coupling coefficient could be found, for which the voltage transfer function was irrelevant to load. In [2], the output voltage was insensitive to loading variations if the operating frequency was adjusted according to coupling variations, and a parallel-resonant class-D oscillator transmitter was developed to track this optimal operating frequency. In [16], a design and optimization method was proposed to achieve a better overall efficiency and good output voltage controllability in a WPT system.…”

Section: Introductionmentioning

confidence: 99%

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Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System

Sun

Tang

2015

Energies

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Abstract:Conditions for load-independent output voltage or current in two-coil wireless power transfer (WPT) systems have been studied. However, analysis of load-independent output current in three-coil WPT system is still lacking in previous studies. This paper investigates the output current characteristics of a three-coil WPT system against load variations, and determines the operating frequency to achieve a constant output current. First, a three-coil WPT system is modeled by circuit theory, and the analytical expression of the root-mean-square of the output current is derived. By substituting the coupling coefficients, the quality factor, and the resonant frequency of each coil, we propose a method of calculating the frequency for load-independent output current in a three-coil WPT system, which indicates that there are two frequencies that can achieve load-independent output current. Experiments are conducted to validate these analytical results.

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Investigating the frequency for load‐independent output voltage in three‐coil inductive power transfer system

Sun

Tang

Chen

2015

Circuit Theory & Apps

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Summary Using circuit theory, this letter investigates the output voltage characteristics of three‐coil inductive power transfer (IPT) system against load variations and determines the operating frequency to achieve a constant output voltage. First, a three‐coil IPT system is modeled, and the analytical expression of the root‐mean‐square of the output voltage is derived. By substituting the coupling coefficient, the quality factor, and the resonant frequency, we propose an intuitive method of calculating the frequency for load‐independent output voltage for the first time. When the coupling coefficient is relatively small, there are three frequencies that achieve load‐independent output voltage. If the coupling coefficient increases and is greater than 1true/2, only two frequencies can achieve load‐independent output voltage. Experiments are conducted to confirm these conclusions. Copyright © 2015 John Wiley & Sons, Ltd.

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Wireless Power Transmission With Self-Regulated Output Voltage for Biomedical Implant

Cited by 269 publications

References 30 publications

Secondary Side Output Voltage Stabilization of an IPT System by Tuning/Detuning through a Serial Tuned DC Voltage-controlled Variable Capacitor

Secondary Side Output Voltage Stabilization of an IPT System by Tuning/Detuning through a Serial Tuned DC Voltage-controlled Variable Capacitor

Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System

Investigating the frequency for load‐independent output voltage in three‐coil inductive power transfer system

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