Abstract
A discontinuous conduction mode (DCM) zero-voltage switching (ZVS) scheme for a class-D power amplifier (PA) for wireless power transfer is presented. The sizes of the ZVS inductor and capacitor are reduced by 7.5 and 5 times and ZVS is achieved even subject to PA supply voltage and output current variations. The class-D PA was fabricated with a 0.35 $\mu \mathrm{m}$ highvoltage CMOS process. The ZVS LC resonant tank consists of a 39 nH inductor and a 200 nF capacitor. The switching frequency was 6.78 MHz and the supply voltage was 20 V. Measurement results show that the PA delivered an output power of 7.18 W with a peak efficiency of 87.0%.
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