Co-optimization of efficiency and load modulation data rate in a wireless power transfer system
Co-optimization of efficiency and load modulation data rate in a wireless power transfer system
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无线电力传输系统中效率和负载调制数据速率的协同优化
DOI：
10.1109/iscas.2015.7168729
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Joshua R. Smith
中科院分区：
文献类型：
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作者：
Xingyi Shi;Aaron N. Parks;Benjamin H. Waters;Joshua R. Smith
带内负载调制作为在无线电力传输(WPT)系统中将信息从无线供电的客户端设备传输到电力供应商的一种手段，长期以来一直被认为对电力传输的效率具有不可接受的影响。传统的负载调制涉及接收线圈完全或严重失谐，以便在电源提供商侧产生可检测的幅度移位，从而传输信息。在这项工作中，我们通过考虑发射功率放大器(PA)的功耗来分析负载调制对系统效率的影响，并确定了通信能力和端到端无线功率传输效率之间的折衷。我们还决定了如何选择一种负载调制策略，在保持高对比度上行链路信令的同时减少功率传输效率的降级。最后，我们探讨了使用相干解调(IQ解调)来通过提高功率提供商对负载调制信号的灵敏度来降低对负载调制系统的失配要求。
In-band load modulation as a means of transferring information from a wirelessly-powered client device to a power provider in a wireless power transfer (WPT) system has long been considered to have an unacceptable impact on the efficiency of power transfer. Conventional load modulation involves either completely or severely detuning the receive coil in order to produce a detectable amplitude shift at the power provider side and thereby transfer information. In this work, we analyze the impact of load modulation on system efficiency by considering the power consumption of the transmit power amplifier (PA) and identify a tradeoff between communication capability and end-to-end wireless power transfer efficiency. We also determine how to select a load modulation strategy which reduces the degradation in power transfer efficiency while maintaining high-contrast uplink signaling. Finally, we explore the use of coherent demodulation (IQ demodulation) to reduce the mismatch requirement on a load modulation system by improving the power provider's sensitivity to load modulated signaling.