Powersphere: A Photovoltaic Cavity Converter for Wireless Power Transmission using High Power Lasers
Powersphere: A Photovoltaic Cavity Converter for Wireless Power Transmission using High Power Lasers
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Powersphere：使用高功率激光器进行无线电力传输的光伏腔转换器
DOI：
10.1109/wcpec.2006.279380
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Friedman
中科院分区：
文献类型：
--
作者：
U. Ortabasi;H. Friedman
PowerSphere （PS）是一种高效的光伏空腔转换器（PVCC），正在开发用于无线电力传输（WPT）或激光功率集束（LPB）。目标功率范围为1kw ~ 100kw。本文报道了工作在1.064mum的Nd:YAG激光器在100 ~ 200 W范围内获得的初步结果。作为接收器，我们使用了一个改良的太阳能PVCC原型，配备了先进的硅聚光电池。由22个内部迷你模块组成的PowerSphere的整体“阵列”效率超过14%。这个结果必须理解：a)硅电池不能很好地匹配1064nm波长，b)球体内的通量密度比一个太阳少30%，尽管这些电池被优化为500个太阳，c) PowerSphere内测试电池的标准AR涂层在1064nm处的反射率约为15%，d)腔内的细胞数量仅为24%。考虑到这些事实，结果是令人鼓舞的。除(a)项外，如果对这些限制因素进行校正，配备先进Si集中器电池的PowerSphere将允许以40%的效率转换Nd:YAG辐射。我们的分析研究预测，如果使用具有完美匹配带隙的电池代替硅电池，可以实现超过60%的阵列转换效率
PowerSphere (PS) is a high efficiency Photovoltaic Cavity Converter (PVCC) that is under development for Wireless Power Transmission (WPT) or Laser Power Beaming (LPB). The targeted power range is from 1 kW to 100 kW. In this paper we report the preliminary results in the 100 W to 200 W range that were obtained with a Nd:YAG laser operating at 1.064mum. As the receiver we used a modified solar PVCC prototype equipped with advanced Si concentrator cells. The overall "array" efficiency of the PowerSphere consisting of 22 internal mini-modules is over 14%. This result must be viewed with the understanding that: a) Si cells are not a good match for the 1064 nm wavelength, b) the flux density inside the sphere is 30% less than one sun, though the cells are optimized for 500 suns, c) the standard AR coating for the test cells inside the PowerSphere have a reflectance of ~15% at 1064 nm and, d) the cell population inside the cavity is only 24%. Given these facts the result is encouraging. If, corrected for these limiting factors, except item (a), PowerSphere equipped with advanced Si concentrator cells would allow conversion of Nd:YAG radiation at 40% efficiency. Our analytical studies predict that an array conversion efficiency of over 60% can be achieved if cells with perfectly matching bandgaps are used instead of Si cells