摘要
在激光无线能量传输(LWPT)中,传能激光波长、光功率和光电池温度对光电池的输出特性有显著影响,最大功率跟踪(MPPT)技术可解决上述等因素造成的功率失配问题,提升系统的DCDC效率。构建了针对LWPT的MPPT集成仿真系统,耦合了波长、光功率和温度对GaAs光电池输出特性的综合影响,可以同时分析光电池在功率匹配、功率失配和MPPT调制等多种条件下的输出特性。基于该仿真系统,研究了光电池在不同波长、光功率和温度条件下的物理规律。波长增大时,在850 nm左右转换效率η_(max)达到最大值为50%,波长继续增大,光子能量小于GaAs禁带宽度导致η_(max)迅速下降。功率增大时,η_(max)基本不变,最大功率匹配电阻RL_(max)减小。温度升高时,η_(max)和RL_(max)均持续下降。此外,研究了光电池在功率失配时的输出特性,此时光电池的转换效率对比功率匹配时均有不同程度的下降。根据光电池的输出特性在仿真系统设计了MPPT电路,利用时间扰动算法进行最大功率跟踪。光电池在MPPT系统调制后均可工作在功率匹配时的最大功率点,且光电池能源利用率达到99.93%。研究结果对用于激光输能有重要指导意义。
In the laser wireless power transmission(LWPT),the wavelength,laser power and temperature of the power transfer laser have a significant influence on the output characteristics of the photocell.The_(max)imum power point tracking(MPPT)can solve the power mismatch problem under the influence of the above factors and improve the DC-DC efficiency of the system.In this paper,an integrated simulation system of MPPT was built for LWPT.The comprehensive influence of wavelength,laser power and temperature on the output characteristics of GaAs photocell was coupled.The output characteristics of photocell under various conditions such as power matching,power mismatch and MPPT modulation could be analyzed at the same time.Firstly,the physical laws of photocell under different wavelength,laser power and temperature were studied.When the wavelength increased,the conversion efficiencyη_(max)reached the_(max)imum value of 50%at about 850 nm,and thenη_(max)decreased rapidly because the photon energy was less than the GaAs band gap.Power increased,η_(max)was basically unchanged,and the_(max)imum power matching resistance RL_(max)decreased.The temperature rised,η_(max)and RL_(max)decreased continuously.In addition,the output characteristics of the photocell in the case of power mismatch were studied.The conversion efficiency of the photocell decreased to different degrees compared with the power matching.According to the output characteristics of the photocell,the MPPT circuit was designed in the simulation system,and the_(max)imum power tracking was carried out by using the perturb and observation algorithm.After modulation in MPPT system,the photocell can work at the_(max)imum power point of power matching,and the energy utilization rate of photocell can reach 99.93%.The research results have important guiding significance for the practical application of laser energy transmission.
作者
杨擎东
杨火木
王俊
苟于单
汪莎
周寿桓
Yang Qingdong;Yang Huomu;Wang Jun;Gou Yudan;Wang Sha;Zhou Shouhuan(College of Electronic Information,Sichuan University,Chengdu 610000,China;Suzhou Everbright Photonics Co.,Ltd.,Suzhou 215000,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第5期211-219,共9页
Infrared and Laser Engineering
基金
国家自然科学基金(61975137)。
关键词
激光无线能量传输
最大功率跟踪系统
GaAs光电池
光电池特性
功率匹配
集成仿真系统
laser wireless power transmission
maximum power tracking system
GaAs photocell
characteristics of photocell
power matching
integrated simulation system
