Methods to improve efficiency of photovoltaic receiver for laser powered unmanned aerial vehicle

Xiaoguang, 刘晓光 Liu; Wenshen, 华文深 Hua; Xun, 刘 恂 Liu; Tong, 郭 彤 Guo

doi:10.3788/irla201645.0306002

Cited by 5 publications

(7 citation statements)

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“…The laser wireless power transmission (WPT) is a WPT technology using laser as the power transmission medium, and the transmission distance can reach several kilometers, with a small loss, a high transmission efficiency, and a compact transmission device [1][2][3][4][5]. Owing to these advantages, it is widely used in long-endurance unmanned aerial vehicles, unmanned boats, unmanned submarines, robotic fish, and other mobile electric facilities and has become a popular field of competing research [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

He,

Pan,

Zheng

et al. 2024

Photonics

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The powersphere is a spherical enclosed receiver composed of multiple photovoltaic cells. It serves as a replacement for traditional photovoltaic panels in laser wireless power transmission systems for optoelectronic conversion. The ideal powersphere aims to achieve a uniform distribution of light within the cavity through infinite reflections, reducing energy losses in the circuit. However, due to the high absorption rate of the photovoltaic cells, the direct irradiation area on the inner surface of the powersphere exhibits a significantly higher light intensity than the reflected area, resulting in a suboptimal level of light uniformity and certain circuit losses. To address the aforementioned issues, a method of intra-cavity beam splitting in the powersphere is proposed. This solution aims to increase the area of direct illumination and reduce the intensity difference between direct and reflected lights, thereby improving the light uniformity on the inner surface of the powersphere. Utilizing the transformation matrix of Gaussian beams, the q parameters for each optical path with beam splitting were calculated, and the equality of corresponding q values was demonstrated. Further, based on the q parameter expression for the electric field of Gaussian beams, the intensities for each optical path were calculated, and it was demonstrated that their values are equal. Additionally, an optical software was utilized to establish a model for intra-cavity beam splitting in the powersphere. Based on this model, a beam-splitting system was designed using a semi-transparent and semi-reflective lens as the core component. The light uniformity performance of the proposed system was analyzed through simulations. To further validate the effectiveness of the calculations, design, and simulations, multiple lenses were employed to construct the beam-splitting system. An experimental platform was set up, consisting of a semiconductor laser, monocrystalline silicon photovoltaic cells, beam expander, Fresnel lens, beam-splitting system, and powersphere. An experimental verification was conducted, and the results aligned with the theoretical calculations and simulated outcomes. The above theory, simulations, and experiments demonstrate that the intra-cavity beam-splitting method effectively enhances the optical uniformity within the powersphere.

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Section: Introductionmentioning

confidence: 99%

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

He,

Pan,

Zheng

et al. 2024

Photonics

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“…G cells with different laser power densities irradiated 2 m away were used, and the pho lectric conversion efficiency of GaAs cells showed a single-peak characteristic with variation in laser power density. In 2016, Liu et al [11] conducted a theoretical anal and experimental study of the response characteristics of photovoltaic devices under The response characteristics of the laser cell are the key factors affecting the transmission efficiency of the system, and scholars from various countries have conducted extensive research on this topic. In 2010, the U.S.…”

Section: Introductionmentioning

confidence: 99%

“…Ga cells with different laser power densities irradiated 2 m away were used, and the phot lectric conversion efficiency of GaAs cells showed a single-peak characteristic with variation in laser power density. In 2016, Liu et al [11] conducted a theoretical analy and experimental study of the response characteristics of photovoltaic devices under homogeneous laser irradiation, and the results showed that the parallel photovoltaic vices were less affected by the distributed inhomogeneous laser irradiation, and the p toelectric conversion efficiency decreased linearly with the increase in temperature; the fore, the optimization of photovoltaic cells is needed to control the temperature. Erdem et al [9] studied the effects of solar power density and silicon cell temperature on cell output in 2013, and the experimental results showed that the best way to improve the performance of laser cells is to reduce the laser cell temperature and increase the incident optical power on the surface of the laser cells, which has some reference value for the study of the characteristics of laser cells under laser irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…GaAs cells with different laser power densities irradiated 2 m away were used, and the photoelectric conversion efficiency of GaAs cells showed a single-peak characteristic with the variation in laser power density. In 2016, Liu et al [11] conducted a theoretical analysis and experimental study of the response characteristics of photovoltaic devices under inhomogeneous laser irradiation, and the results showed that the parallel photovoltaic devices were less affected by the distributed inhomogeneous laser irradiation, and the photoelectric conversion efficiency decreased linearly with the increase in temperature; therefore, the optimization of photovoltaic cells is needed to control the temperature.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Laser Cell Response Characteristics under Different Irradiation Conditions

et al. 2023

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Although the application of laser wireless energy transmission technology in many fields such as UAV power supply is increasing, the laser incidence angle and beam shift remain the key factors limiting the efficiency of long-range laser wireless energy transmission. In this study, a laser cell response test platform was built to measure and analyze the response characteristics of a laser cell under different laser incidence angles and beam shifts. The results show that the increase in the incident angle intensifies the reflection on the irradiated surface, resulting in a linear decrease in the power density received by the laser cell, which eventually leads to a significant decrease in the output power, and the output power tends to be close to 0 when the incident angle exceeds 75°. The increase in the beam offset distance increases the reverse bias of the cell, which is the main reason for the significant decrease in the output power. The local irradiation also leads to an increase in the heat generation power; when the beam coverage is below 50%, the overall output power tends to be close to 0. This study provides a reference for improving the laser wireless energy transmission efficiency and laser cell optimization.

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“…References [1][2][3][4] pointed out that the wireless energy transmission via laser has the advantages of long transmission distance, small transceiver device, better operational flexibility, user friendliness, and so on. References [5][6][7][8][9] have reported that it can be used in spacecraft, unmanned aerial vehicle, unmanned boats, robot, electric vehicle, and other specific fields. However, the laser intensity distribution is non-uniform, resulting in serious energy loss of the photovoltaic receiving device.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Pan

Zhang

et al. 2021

Photonics

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The powersphere is a device used for maximizing the conversion of light in wireless energy transmission via laser. It is a spherical structure made up of thousands of photovoltaic cells. Due to the large dimensions and existence of many holes in the spherical surface, there are some drawbacks in machining, such as limited movement space of the machines, long cycle, low precision, and high cost. In this context, with a powersphere irradiated by the laser as the model, the principle of powersphere is deduced theoretically. It is proven that the illuminance value at any position on the inner wall of the powersphere is equal, and the calculation formula of this value is derived. Based on this theory and the comparative analysis of processing methods and the results of processing experiments, the structure of the powersphere is designed. The experimental processing of the powersphere is carried out by selecting the welding method. Finally, two hemispherical powersphere frames are processed, which are connected by screws to form a ball frame for the installation of photovoltaic cells. The results show that the improved design and fabricating method can process the powersphere quickly, accurately, and economically. A comparative experiment of powersphere and photovoltaic panel was carried out. The experimental results show that the powersphere has the function of light uniformity and repeated use of laser. So, the designed and processed powersphere is consistent with the theoretical analysis.

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Methods to improve efficiency of photovoltaic receiver for laser powered unmanned aerial vehicle

Cited by 5 publications

References 0 publications

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

Analysis of Laser Cell Response Characteristics under Different Irradiation Conditions

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

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