| Among today’s solar collection devices,concentrated photovoltaic(CPV)devices with multi-junction solar cells and concentrator mirrors have great potential for application,but the need for concentrators,trackers and coolers for CPV systems greatly diminishes the advantages of CPV systems.Therefore it becomes especially important to find a solar collection and tracking device with low cost,low energy consumption and small size.According to the current research,liquid prisms based on dielectrowetting effect,as a candidate technology for a new generation of beam deflection tracking strategy,have great advantages to be applied to CPV systems because of their adjustable refractive index,small size,high concentration ratio,and low energy consumption.However,there are still two major drawbacks of the conventional liquid single prism,one is the need for power supply,which increases the operating cost;the other is that there is only one dynamic interface adjustable inside the prism,which limits the beam deflection capability of the prism.Therefore,it becomes particularly important to study a self-powered,multi-interface liquid prism for application in CPV systems.In this paper,a self-powered programmable compound liquid prism(PCP)based on a triboelectric nano-generator(TENG)is fabricated to address the two problems of conventional liquid single prisms mentioned above.The following is the main content of the research in this paper.In the theoretical study,based on the theoretical basis of spatial optical path calculation,the beam deflection angle equation of PCP and single prism is derived so as to analyze the magnitude of polarization ability of both;the voltage control strategy model of AC to DC circuit(RC circuit)in TENG-PCP self-powered optical system is derived based on the electrical related principle,and the correctness of voltage regulation using RC circuit is verified.In the simulation analysis,we mainly use Python simulation to analyze the effect of the prism angle of PCP on the beam deflection angle and luminous flux under different liquid refractive indices,and determine the single electrode mode for the sidewalls of PCP;we study the effect of the PCP aspect ratio on the maximum beam deflection angle and luminous flux for a specific liquid refractive index,and determine that a PCP with an aspect ratio of 2:1 can obtain a larger beam deflection angle and higher parallel light luminous flux.The PCP is then simulated and traced using Comsol Multiphysics software to determine the correctness of the Python simulation,and finally the optical tracing model is built using Optic Studio Zemax optical software to illustrate the importance of beam collimation in the CPV system.In the experimental study,TENG and the best configuration of PCP obtained from the simulation analysis was produced,and the devices were connected using an RC circuit to form a TENG-PCP self-powered optical system.As measured by the relevant instruments,the RC circuit can rectify the-265 V～+265 V AC generated by TENG into a more stable and straight DC;using a CCD camera to photograph the PCP liquid surface deflection and obtain the data on the relationship between the PCP prism angle and voltage and the PCP liquid surface deflection image,it can be found that the experimental data and the simulation results are not very different;the TENG-PCP self-powered optical system and the conventional single prism are subjected to a beam deflection experiment.The beam deflection experiment of TENG-PCP self powered optical system shows that PCP has a wider beam deflection angle range(about15 °),Compared with the conventional single prism,it is increased by 38%;Combining TENG-PCP with Fresnel lens to power multi-junction solar cells,the results found that the power of multi-junction solar cells increased by 1.2 mW. |
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