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http://dx.doi.org/10.12673/jant.2019.23.2.166

Performance Analysis of 6.78MHz Current Mode Class D Power Amplifier According to Load Impedance Variation  

Go, Seok-Hyeon (Dept. of Electronics Engineering, Incheon National University)
Park, Dae-kil (Dept. of Electronics Engineering, Incheon National University)
Koo, Kyung-Heon (Dept. of Electronics Engineering, Incheon National University)
Publication Information
Journal of Advanced Navigation Technology / v.23, no.2, 2019 , pp. 166-171 More about this Journal
Abstract
This paper has designed a current mode class D power amplifier to increase the transmission efficiency of a 6.78 MHz wireless power transfer (WPT) transmitter and to ensure stable characteristics even when the transmitting and receiving coil intervals change. By reducing the loss due to the parasitic capacitor component of the transistor, which limits the theoretical efficiency of the linear amplifier, this research has improved the efficiency of the power amplifier. The circuit design simulator was used to design the high efficiency amplifier, and the power output and efficiency characteristics according to the load impedance change have been simulated and verified. In the simulation, 42.1 dBm output and 95% efficiency was designed at DC bias 30 V. The power amplifier was fabricated and showed 91% efficiency at the output of 42.1 dBm (16 W). The transmitting and receiving coils were fabricated for wireless power transfer of the drone, and the maximum power added efficiency was 88% and the output power was $42.1dBm{\pm}1.7dB$ according to the load change causing from the coil intervals.
Keywords
Class D current mode power amplifier; Wireless power transfer; Load variation; Drone;
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