The Effect of Non-Uniform Irradiation on Laser Photovoltaics: Experiments and Simulations

Wang, Hao; Wang, Jun; Yang, Huajun; Deng, Guoliang; Qing-dong, Yang; Niu, Ruijun; Gou, Yudan

doi:10.3390/photonics9070493

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The main technical challenge lies in developing a high-power laser emitter and improving the conversion efficiency of the receiver. Under the middle/far transmission range, the receiving heat flux presents a fluctuating, nonuniform distribution, which is considered the main reason for the drop in efficiency [7][8][9]. Maintaining the divergence of the laser beam is crucial to prevent a drop in energy conversion efficiency due to misalignment between the laser and the receiver [10].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Reverse Truncated Pyramid and Other Nonimaging Concentrators as the Receiver in Laser Wireless Power Transmission System

Meng,

Li,

Hou

et al. 2024

International Journal of Energy Research

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The global energy landscape faces significant challenges in meeting the demands of modern industries for stable and efficient energy supply. Laser wireless power transmission (LWPT) systems, which utilize the photovoltaic effect to convert laser beam energy, hold great promise due to their long-range transmission capability and high precision. However, the current energy conversion efficiency of these systems requires further improvement to achieve optimal performance. To enhance concentrated photovoltaic (CPV) system performance, the study examines different nonimaging concentrators such as reverse truncated pyramid, cross-compound parabolic concentrator, and square elliptical hyperboloid. Numerical simulations using the finite element method analyze the multifield coupling mechanism of PV modules with various concentration lenses. Three CPV systems with RTP concentrators of different heights were studied to understand the impact of geometry on CPV performance. And the main impact of rotation angle was discussed. The research findings provide essential insights into CPV system performance and the influence of different concentration lenses, contributing valuable knowledge towards improving LWPT technologies.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Reverse Truncated Pyramid and Other Nonimaging Concentrators as the Receiver in Laser Wireless Power Transmission System

Meng,

Li,

Hou

et al. 2024

International Journal of Energy Research

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“…When a laser is irradiated onto a photovoltaic panel, the currents and voltages generated by the cells at different positions are not equal, and they gradually decrease from the center of the spot towards the edges. Therefore, a large number of cells with small output values will become loads, consuming the output power generated by the remaining photovoltaic cells, and causing the cells to heat up and likely even causing a fire [17,18]. This problem can be solved in many ways, and the best way is to improve the uniformity of light on the receiving surface to ensure that the luminous fluxes on the photovoltaic cells are equal [19][20][21][22][23][24][25][26][27][28].…”

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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“…Under the same input power conditions, the more non-uniform the light distribution, the lower the output power. This results in significant circuit losses in the system's output circuit, ultimately reducing the overall conversion efficiency of the system [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experiment of Laser Energy Distribution of Laser Wireless Power Transmission Based on a Powersphere Receiver

Zheng

et al. 2023

Photonics

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Laser wireless power transmission (WPT) is one of the most important technologies in the field of long-range power transfer. This technique uses a laser as a transmission medium instead of conventional physical or electrical connections to perform WPT. It has the characteristics of long transmission distance and flexible operation. The existing laser wireless power transmission system uses photovoltaic cells as a receiver, which convert light into electricity. Due to the contradiction between the Gaussian distribution of laser and the uniform illumination requirements of photovoltaic cells, the laser wireless power transmission technology has problems such as low transmission efficiency and small output power. Therefore, understanding the energy distribution changes in the laser during transmission, especially the energy change after the laser is transmitted to each key device, and analyzing the influencing factors of the energy distribution state, are of great significance in improving the transmission efficiency and reducing the energy loss in the system. This article utilizes the optical software Lighttools as a tool to establish a laser wireless power transmission model based on a powersphere. This model is used to study the energy distribution changes in the laser as it passes through various components, and to analyze the corresponding influencing factors. To further validate the simulation results, an experimental platform was constructed using a semiconductor laser, beam expander, Fresnel lens, and powersphere as components. A beam quality analyzer was used to measure and analyze the laser energy distribution of each component except for the powersphere. The output voltage and current values of various regions of the powersphere were measured using a multimeter. The energy distribution of the powersphere was reflected based on the linear relationship between photo-generated current, voltage, and light intensity. The experimental results obtained were in good agreement with the simulation results. Simulations and experiments have shown that using a beam expander can reduce divergence angle and energy loss, while employing large-aperture focusing lens can enhance energy collection and output power, providing a basis for improving the efficiency of laser wireless power transfer.

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The Effect of Non-Uniform Irradiation on Laser Photovoltaics: Experiments and Simulations

Cited by 5 publications

References 18 publications

Comparative Analysis of Reverse Truncated Pyramid and Other Nonimaging Concentrators as the Receiver in Laser Wireless Power Transmission System

Comparative Analysis of Reverse Truncated Pyramid and Other Nonimaging Concentrators as the Receiver in Laser Wireless Power Transmission System

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

Analysis and Experiment of Laser Energy Distribution of Laser Wireless Power Transmission Based on a Powersphere Receiver

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