Journal of Electrical Engineering and Technology

  • 제13권1호
  • /
  • Pages.250-255
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  • 2018
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  • 1975-0102(pISSN)
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  • 2093-7423(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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Class-E Power Amplifier with Minimal Standby Power for Wireless Power Transfer System

  • Kim, Bong-Chul (Dept. of System Engineering and Development, Power Supply Technology Team, National Fusion Research Institute) ;
  • Lee, Byoung-Hee (Dept. of Electronics and Control Engineering, Hanbat National University)
  • 투고 : 2017.01.23
  • 심사 : 2017.09.09
  • 발행 : 2018.01.01
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초록

This paper presents a method for minimizing standby power consumption in wireless power transfer (WPT) system via magnetic resonance coupling (MRC) that operates at 6.78 MHz. The proposed circuit controls the required capacitance according to operational condition in order to reduce standby power consumption. Based on an impedance characteristic of the class-E power amplifier, operational principles of the proposed circuit are analyzed. Moreover, to verify the effectiveness of the proposed class-E power amplifier, an 8 W prototype for WPT system is implemented. The measured input power of the proposed class-E power amplifier at standby condition is reduced from 5.81 W to 3.53 W.

키워드

E1EEFQ_2018_v13n1_250_f0001.png 이미지

Fig. 1 The structure of the conventional WPT system : (a)At charging mode (b) At standby mode

E1EEFQ_2018_v13n1_250_f0002.png 이미지

Fig. 2. Ropt and Xopt according to output power

E1EEFQ_2018_v13n1_250_f0003.png 이미지

Fig. 3. Total output impedance of power amplifier

E1EEFQ_2018_v13n1_250_f0004.png 이미지

Fig. 4. The structure of the proposed WPT system

E1EEFQ_2018_v13n1_250_f0005.png 이미지

Fig. 5. The output power according to Cd

E1EEFQ_2018_v13n1_250_f0006.png 이미지

Fig. 6. The output impedance according to CO

E1EEFQ_2018_v13n1_250_f0007.png 이미지

Fig. 7. Experimental waveforms of the WPT system: (a) Atcharging mode; (b) Conventional WPT system atstandby mode; (c) Proposed WPT system at standbymode

Table 1. System specifications

E1EEFQ_2018_v13n1_250_t0001.png 이미지

Table 2. Circuit parameters

E1EEFQ_2018_v13n1_250_t0002.png 이미지

Table 3. Comparison of power loss

E1EEFQ_2018_v13n1_250_t0003.png 이미지

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