wireless power transmission from ac to dc at 1 m distance

1. 为了提高整流器在13.56MHz时的效率，在交流侧插入了一个电容器，并在整流器前面插入了一个阻抗匹配器。实验结果表明，在1 kW的输出功率下，效率可达94%。为了提高天线的效率，通过改变导线材料来减小导线电阻，并利用所提出的等效电路来优化磁化电感。结果表明，该天线的效率达到了96%。通过实现以上两种改进，从13.56MHz交流输入到直流输出的总效率预计为094 × 0.96=0.90，然而在1.5 kW输出功率12 cm距离下的实验显示效率为89.1%。该细节于2014年5月在ipec广岛会议上提出。

1. To improve the efficiency of the rectifier at 13.56MHz, a capacitor was inserted in the ac side, and also an impedance matcher was inserted in front of the rectifier. As a result the efficiency 94% was experimentally observed at 1 kW output power. To improve the efficiency of the antenna, the wire resistance was reduced by changing the wire material and the magnetizing inductance was optimized by using the proposed equivalent circuit. As a result the 96% efficiency of the antenna was observed.2. By implementation of the above two improvement, the total efficiency from 13.56MHz ac input to the dc output is expected to be 094x0.96=0.90, however the experiments at 1.5 kW output power of 12 cm distance showed the 89.1% efficiency.. The detail was presented at IPEC-Hiroshima held in May, 2014.