Abstract
Herein, the voltage and current output characteristics of a laser photovoltaic (PV) module applied to a wireless power transmission system using a laser beam are analyzed. First, an experiment is conducted to obtain the characteristic data of the voltage and current based on the laser output power of the laser PV module, which generates the maximum power from the laser beam at a wavelength of 1080 nm; subsequently, the small-signal voltage and current characteristics of the laser PV module are analyzed. From the analysis results, it is confirmed that the laser PV module has a characteristic in which the maximum power generation point varies according to the power level of the laser beam. In addition, similar to the solar cell module, it is confirmed that the laser PV module has a current source and a voltage source region, and it shows a small signal resistance characteristic having a negative value as the operating point goes to the current source region. In addition, in this paper, by reflecting these electrical characteristics, a method for designing the controller of a power converter capable of charging a battery while generating maximum power from a PV module is proposed. Since the laser PV module corresponds to the input source of the boost converter used as the power conversion unit, the small-signal transfer function of the boost converter, including the PV module, is derived for the controller design. Therefore, by designing a controller that can stably control the voltage of the PV module in the current source, the maximum power point, and voltage source regions defined according to the output characteristics of the laser PV module, the maximum power is generated from the PV module. Herein, a systematic controller design method for a boost converter for laser wireless power transmission is presented, and the proposed method is validated based on the simulation and experimental results of a 25-W-class boost converter based on a microcontroller unit control.
Highlights
Studies regarding wireless charging technology for supplying electric power to electric vehicles, various IoT (Internet of Things) devices, and unmanned moving objects have been actively conducted
The power generated from the laser PV module was supplied to the battery after passing through the prototype boost converter, and the electronic load was connected in parallel to the battery for the load test
Because the battery did not reach the full-charge voltage set at 24.5 V, it was operated in the maximum power point tracking (MPPT) mode; it was confirmed that the battery was charging while moving to the maximum power point of the PV module
Summary
Studies regarding wireless charging technology for supplying electric power to electric vehicles, various IoT (Internet of Things) devices, and unmanned moving objects have been actively conducted. The magnetic induction method is mainly used when the distance between the transmitting and receiving coils is short (1–2 cm for electronic products or 0.15 m for electric vehicles), and the magnetic resonance method is applied when electronic products or 0.15 m for electric vehicles), and the magnetic resonance method is applied the transmission distance is longer than the magnetic induction method. In this case, the main target is when the transmission distance is longer than the magnetic induction method. The electromagnetic wave method enables power to be to a transmission distance of several kilometers compared with the other two methods; its transmitted up to a transmission distance of several kilometers compared with the other two methods; transmission efficiency is low, and it is harmful to the human body [1,2,3,4]
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