Maximizing the efficiency of wireless power transfer with a receiver-side switching voltage regulator
Maximizing the efficiency of wireless power transfer with a receiver-side switching voltage regulator
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DOI：
10.1017/wpt.2016.14
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发表时间：
2017-03
影响因子：
1.6
通讯作者：
Yoshiaki Narusue;Y. Kawahara;T. Asami
中科院分区：
文献类型：
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作者：
Yoshiaki Narusue;Y. Kawahara;T. Asami
输出电压调节是实现稳定无线供电的关键技术。接收器侧开关电压调节器对于实现输出电压调节是有用的。然而，本文表明，开关电压调节器的传输效率降低到50%以下的无线电力传输系统，包括一个D类电源逆变器和串联谐振发射和接收谐振器。这种效率降低是由效率> 50%的操作点的不稳定性引起的。开关电压调节器在稳定工作点的输入电阻值远高于使效率最大化的最佳值。为了稳定高效工作点，本文给出了一个稳定性条件，并推导了其充分条件。该充分条件有助于使用K阻抗逆变器的系统设计方法，该方法允许最佳输入电阻值位于允许输入电阻值的范围内。此外，我们介绍了一种基于输入电压的效率最大化方法的系统与接收侧开关稳压器。通过结合这两种方法，效率最大化实现与接收器侧开关电压调节器。所提出的方法进行了验证，通过仿真和测量。
Output voltage regulation is an essential technology for achieving stable wireless power supply. A receiver-side switching voltage regulator is useful for realizing output voltage regulation. However, this paper shows that the switching voltage regulator degrades the transfer efficiency to below 50% in a wireless power transfer system that consists of a class-D power inverter and series-resonant transmitting and receiving resonators. Such efficiency degradation is caused by the instability of an operating point where the efficiency is >50%. The input resistance value of the switching voltage regulator at a stable operating point is much higher than the optimum value for maximizing the efficiency. To stabilize the high-efficiency operating points, this paper formulates a stability condition and derives its sufficient condition. The sufficient condition facilitates a system design method using a K-impedance inverter that allows for the optimum input resistance value to lie in the range of allowable input resistance values. In addition, we introduce an input-voltage-based efficiency maximization method for the system with the receiver-side switching voltage regulator. By combining these two methods, efficiency maximization is realized with the receiver-side switching voltage regulator. The proposed methods were verified by both simulations and measurements.