Mahadi, Ismail Ahmat (2023) Investigating the effects of humidity and temperature for LCL compensation wireless power transfer. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

In recent years, there has been much research in designing an inductive wireless power transfer system. The main challenge for this technology is the efficiency of the system. In designing a Wireless Power Transfer (WPT) system for long-distance applications, the gain bandwidth or Q-factor is a factor that should be considered as it affects the resonant coupling of the transmitter and receiver pads. An insufficient Q-factor will result in weak coupling or possible energy loss due to the attenuation characteristics of the environment, such as resistive and radiation losses. However, a system with too much Q-factor would cause the resonant coils to be very sensitive to the environment, such as temperature, humidity, and human proximity. Since wireless power transmission devices use power electronics technology, this technology is also affected by environment factors such as temperature and humidity. This research therefore, investigates the effect of temperature and humidity in LCL compensation wireless power transfer systems as well as study the safety of the magnetic field generated by the system. This project was carried out into two distinct phases: the first was a simulation analysis for the proposed system using JMAG-Designer software and the second phase was an experimental setup based on the simulated system. The hardware design was tested on the various temperature and humidity levels to observe the impact of the change in efficiency of the system. The results shows that the efficiency of both the simulation and experiment are high at 94.8% and 91.7% respectively, when the distance is low. However, as the distance increased, the efficiency decreased to 68.5% for simulation and 66.6% for experiment at 10 cm distance. Regarding the temperature and humidity setup, the temperature was set between 27-degree Celsius (room temperature) and 60-degree Celsius, while the humidity was set between 60% which is at room temperature and 99%. The result was showed that temperature and humidity have a very small changes on the efficiency of the system, with an error margin of 1%. Therefore, it was concluded that the efficiency can only be affected by the distance between the coils, load resistance, and frequency value

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