Use of Transmitter-Side Electrical Information to Estimate Mutual Inductance and Regulate Receiver-Side Power in Wireless Inductive Link
Use of Transmitter-Side Electrical Information to Estimate Mutual Inductance and Regulate Receiver-Side Power in Wireless Inductive Link
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DOI：
10.1109/tpel.2016.2530816
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发表时间：
2016-02
影响因子：
6.7
通讯作者：
Jeff P. W. Chow;H. Chung;Chun-Sing Cheng
中科院分区：
文献类型：
--
作者：
Jeff P. W. Chow;H. Chung;Chun-Sing Cheng
众所周知，无线电感链路的功率传输效率和传输功率受到磁耦合强度和发射线圈和接收线圈之间的空间位移的显著影响。发射线圈和接收线圈之间的不对准实际上是不可避免的。为了控制和调节接收端功率，通常需要现场测量电量并在发送端和接收端之间建立通信链路。本文将研究利用发射端电学信息来估计互感和调节接收端的功耗。在数学公式中考虑了二极管桥式整流器的非线性输入电压电流特性，该特性在系统中引起电流畸变。该技术已成功实现在一个4w的无线LED驱动样机上。实验结果表明，LED功率可调节在±25%的空间偏差范围内。估计的互感也与理论预测非常吻合。
It is well-known that the power transfer efficiency and the power transmitted over a wireless inductive link are significantly affected by the strength of the magnetic coupling and the spatial displacement between the transmitting and receiving coils. Misalignment between the transmitting and receiving coils is practically unavoidable. In order to control and regulate the receiver-side power, on-the-spot measurement of electrical quantities and establishment of communication link between the transmitter and receiver are typically required. This paper will present an investigation into the use of the transmitter-side electrical information to estimate the mutual inductance and regulate the power consumption of the receiver side. The nonlinear input voltage-current characteristics of the diode-bridge rectifier, which causes current distortions in the system, are taken into account in the mathematical formulations. The proposed technique is successfully implemented on a 4-W wireless-powered LED driver prototype. Experimental results reveal that the LED power can be regulated within ±25% spatial misalignment over the operating zone. The estimated mutual inductance is also found to be in close agreement with the theoretical predictions.