Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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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)
  • Received : 2017.01.23
  • Accepted : 2017.09.09
  • Published : 2018.01.01
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Abstract

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.

Keywords

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

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Fig. 2. Ropt and Xopt according to output power

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Fig. 3. Total output impedance of power amplifier

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Fig. 4. The structure of the proposed WPT system

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Fig. 5. The output power according to Cd

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Fig. 6. The output impedance according to CO

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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

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Table 2. Circuit parameters

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Table 3. Comparison of power loss

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