Design and Investigation of Miniature Solar Cell Source Inductive Wireless Power Transfer on Various Distances, Turns and Loads

Abstract

The research was to transfer the electric power from a photovoltaic module in wireless utilized magnetic coupling method and an inverter. It was also investigated the waveform characteristics due to various distances, turns and loads. The measurements were performed by using a storage digital oscilloscope, to obtain the voltage magnitudes and harmonics. The results indicated that the receiver voltage magnitudes would decrease drastically, in hyperbolic curves, as the distance increased. The receiver voltage magnitudes would also decrease considerably as the turns reduced, with the average reductions as 0.095 and 0.357 volts, from 600 to 400 and 400 to 200 turn reductions respectively. The THDs in the transmitter voltages were fairly constant, as average of 26.75%. Nevertheless, the receiver voltage THDs would decrease significantly as the distance increased, with decreasing average as 38.09% of the three condition percentage reductions. While, the THDs would reduce considerably as the turns decreased, as 25.28% in average for the 200 to 400, and 400 to 600 turns on one cm of distance. Otherwise, the voltage magnitudes would decrease as the loads increased where from one to five lamp loads, as 0.489, 1.334 and 1.482 volts reductions for 200, 400 and 600 turns respectively. The THDs would decrease slightly as the loads increased, with the average reduction of 5.4% from one to five lamp loads, for the three turn conditions. The receiver voltage magnitudes would increase steep linearly, with the average ratio of one per 9.30 as the transmitter voltage magnitudes increased. While, the THDs of receiver voltages would reduce considerably as the transmitter voltage magnitudes increased, with 8.98% reduction for 1.4 to 5.2 volts of the transmitter voltage magnitudes. The receiver power would reduce more drastically, compared to the voltages, as the distance increased. This case was caused which the powers were influenced by both electric voltage and current. The efficiency would also reduce drastically as the distance increased. Nevertheless, it was gentler than the power, because the early values have already been low. Both parameters were significantly influenced by the coil turns, which the efficiency would be lower as the coil turns reduced. Based on the research results, the maximum transferring efficiency was 0.0615. The efficiency would slightly increase and tended to be saturated toward a certain value as the load increased. Therefore, most likely, in the future, the coil turns should be increased.

Wireless Technologies for Energy Harvesting and Transmission for Ambient Self-Powered Systems

“…As presented in Figure A, Waluyo et al . designed a WPT system by integrating an inductive magnetic coupling method with a miniature solar cell . A solar panel with the maximum power of 100 W and 17.5 V was used, with standard test conditions, and the air mass coefficient of solar energy and the cell temperature were 1000 W/m 2 , 1.5, and 25 °C, respectively.…”

“…(A) Wireless power transfer of a miniature solar cell energy source by magnetic inductive coupling. Reprinted with permission under a Creative Commons open access license from ref . Copyright 2018 Chulalongkorn University Publishing.…”

“…As presented in Figure 10A, Waluyo et al designed a WPT system by integrating an inductive magnetic coupling method with a miniature solar cell. 19 A solar panel with the maximum power of 100 W and 17.5 V was used, with standard test conditions, and the air mass coefficient of solar energy and the cell temperature were 1000 W/m 2 , 1.5, and 25 °C, respectively. The electricity generated in the solar panel was converted into AC voltages with a frequency of 50 Hz and flowed to the transmitter coil, and the inductive voltages were captured by the receiver coil, which acts as a power supply.…”

“…Modern living environments host a wide range of ambient natural and artificial energy sources, such as solar, wind, wave, heat, vibrations, electromagnetic waves, and human activities . Over the past decade, technologies to harness these renewable energy sources have been intensively investigated, including wireless energy harvesting systems, such as triboelectric, − magnetoelectric (ME), − thermoelectric, − piezoelectric, − photovoltaic (PV), , radio frequency (RF), , and magnetic field energy harvesting. − These efforts have resulted in rapid advances in the performance of energy harvesting systems. For example, triboelectric nanogenerators (TENGs) have shown that the instantaneous output power density has initially increased from a few micrometers cm –2 to several tens of mW cm –2 .…”