Waveform Equations, Output Power, and Power Conversion Efficiency for Class-E Inverter Outside Nominal Operation

Nagashima, Tadamichi; Wei, Xiuqin; Suetsugu, Tadashi; Kazimierczuk, Marian K.; Sekiya, Hiroo

doi:10.1109/tie.2013.2267693

Cited by 46 publications

(33 citation statements)

References 21 publications

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“…In order to simplify the modeling, the analysis is carried out based on the following assumptions [30]- [32]:…”

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

“…2) The quality factor of the load loop is large enough so that the load current I load can be taken as a pure sinusoid. The switching loop has three conductive paths, including the channel and body diode of MOSFET and the shunt capacitance [32]. During the turn-on period (V gs is high), the channel is always conductive.…”

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

“…According to the conductive paths during the turn-off period, the operation of the PA can be divided into four cases [32], as illustrated in Fig. 3.…”

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

“…Because the PA's operating frequency locates in the vicinity of the load loop's resonant frequency, the loop can be taken to be driven by the fundamental component of V ds [32]. Then, the resistance R load of the loop can be derived as…”

Section: B Derivationmentioning

confidence: 99%

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Modeling and Optimization of Class-E Amplifier at Subnominal Condition in a Wireless Power Transfer System for Biomedical Implants

Líu

Shao

Fang

2017

IEEE Trans. Biomed. Circuits Syst.

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Abstract-For the class-E amplifier in a wireless power transfer (WPT) system, the design parameters are always determined by the nominal model. However, this model neglects the conduction loss and voltage stress of MOSFET and cannot guarantee the highest efficiency in the WPT system for biomedical implants. To solve this problem, this paper proposes a novel circuit model of the subnominal class-E amplifier. On a WPT platform for capsule endoscope, the proposed model was validated to be effective and the relationship between the amplifier's design parameters and its characteristics was analyzed. At a given duty ratio, the design parameters with the highest efficiency and safe voltage stress are derived and the condition is called 'optimal subnominal condition.' The amplifier's efficiency can reach the highest of 99.3% at the 0.097 duty ratio. Furthermore, at the 0.5 duty ratio, the measured efficiency of the optimal subnominal condition can reach 90.8%, which is 15.2% higher than that of the nominal condition. Then, a WPT experiment with a receiving unit was carried out to validate the feasibility of the optimized amplifier. In general, the design parameters of class-E amplifier in a WPT system for biomedical implants can be determined with the proposed optimization method in this paper.Index Terms-Biomedical implants, class-E amplifier, efficiency improvement, subnominal condition, wireless power transfer system, zero-voltage-switching (ZVS).

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“…In order to simplify the modeling, the analysis is carried out based on the following assumptions [30]- [32]:…”

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

“…According to the conductive paths during the turn-off period, the operation of the PA can be divided into four cases [32], as illustrated in Fig. 3.…”

Section: Determination Of High-efficiency Operatingmentioning

confidence: 99%

Section: B Derivationmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Optimization of Class-E Amplifier at Subnominal Condition in a Wireless Power Transfer System for Biomedical Implants

Líu

Shao

Fang

2017

IEEE Trans. Biomed. Circuits Syst.

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show abstract

“…One of the major resonant inverters, which achieves high power-conversion efficiency, is the class-E inverter [14][15][16][17][18]. The class-E inverter requires a highly voltage-resistant switching device because the maximum switch voltage can be as high as 3.5-times of the input voltage.…”

Section: Introductionmentioning

confidence: 99%

Steady-state analysis and design of phase-controlled class-D ZVS inverter

Osato

Wei

Asiya

et al. 2020

NOLTA

Self Cite

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This paper proposes an analysis and design method of the phase-controlled class-D Zero-Voltage Switching (ZVS) inverter. To derive the ZVS region diagram, a steady-state waveform of the phase-controlled class-D inverter is analytically derived. This analysis introduces an expression of an anti-parallel diode behavior and multiple-harmonic analysis. By developing a ZVS region diagram at the fixed phase shift and drawing power contour lines over the region diagram, a parameter region, in which sufficient power can be obtained with achieving the ZVS, are also determined. The analysis and design method of this paper were verified through circuit experiments and by collating the quantitative values obtained from the experiment and analysis.

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A radio-frequency generator for ion thrusters based on a Class-E power circuit

et al. 2022

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Operating a radio-frequency ion thruster (RIT) requires a high frequency current flowing through an induction coil in order to ignite and maintain an inductively coupled plasma discharge (ICP). Several methods to create that current have been demonstrated and evaluated regarding complexity, flexibility and efficiency. Especially in space applications reliability and minimal power loss is crucial to comply to strict mission requirements. As one of the leanest concepts in terms of required components and nevertheless highest possible efficiency, the Class-E power circuit has proven itself as a well suited radio-frequency generator (RFG) of a RIT system. However, electrical performance and especially electromagnetic compatibility (EMC) during operation have not been evaluated, but are essential if the system is intended for use in space. In order to fill this gap and bring the Class-E circuit into the fold of established RFG concepts, a prototype was designed, built, and used to operate a RIT-10. For reference, a conventional Half-Bridge RFG was tested under the same operating conditions. Further investigations are concerned with EMC behaviour of both devices and show that Class-E circuit exhibits significantly lower electromagnetic emission during operation compared to the Half-Bridge reference.

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Waveform Equations, Output Power, and Power Conversion Efficiency for Class-E Inverter Outside Nominal Operation

Cited by 46 publications

References 21 publications

Modeling and Optimization of Class-E Amplifier at Subnominal Condition in a Wireless Power Transfer System for Biomedical Implants

Modeling and Optimization of Class-E Amplifier at Subnominal Condition in a Wireless Power Transfer System for Biomedical Implants

Steady-state analysis and design of phase-controlled class-D ZVS inverter

A radio-frequency generator for ion thrusters based on a Class-E power circuit

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