TY  - MANSCPT
AU  - Zulkifly Bin Mohammad @ Ab Aziz,
TI  - Loosely coupled wireless power  transfer for led-based  photocatalytic reactor using  inductive load-matched class-e  inverter
SN  - THE0009872(Local)
PY  - 2024///
CY  - Kuantan, Pahang
PB  - UMPSA
KW  - Faculty of Electrical & Electronics Engineering Technology
KW  - Dissertations
KW  - Universities and colleges
N1  - Faculty of Electrical & Electronics Engineering Technology; Thesis (Doctor of Philosophy) -- Universiti Malaysia Pahang – 2024; Includes bibliographical references
N2  - The photochemical transformation of organic pollutants over artificial light emitters is a  convenient alternative, offering greater freedom of control over solar sources. Recently,  a novel approach aimed to elevate the irradiation profile within traditional photocatalytic  reactors by incorporating an LED-based light emitter powered through inductive power  transfer (IPT) has been proposed. Previous photocatalytic reactor coil designs overlooked  magnetic field uniformity, leading to blackouts when the light emitter traversed regions  with weakened fields. Additionally, the direct connection of conventional class-E  amplifiers to reactive loads, like the triple Helmholtz coil pairs (3HCP) proposed here,  posed safety risks due to potential overheating and electrocution hazards. Furthermore,  current artificial lighting in conventional photocatalytic reactors is energetically  inefficient, requiring high power and offering a poor irradiation profile, compounded by  environmental toxicity from the use of mercury. In this study, a system consisting of  multiple spherically shaped LED-based light emitters with a custom-designed ferrite core  to improve coupling is proposed to irradiate the interior of a cylindrical slurry  photocatalytic reactor over a loosely coupled wireless power transfer system. The 3HCP  unit with an optimized coil diameter and spacing was proposed to provide uniform  magnetic field coverage inside a cylindrical reactor. A hybrid numerical-analytical  method was employed to gauge the field uniformity by calculating the induced voltage  at selected locations inside the reactor and verified experimentally. The 3HCP coil system  was driven by a power transmitting unit (PTU) based on a class-E inverter with a loadmatched output transformer for isolation and ease in upscaling and downscaling. The  PTU was characterized by power transfer efficiency (PTE) and experimental verification.  Each power receiving unit (PRU) consisted of a tuned LC tank with a white LED and a  custom-built ferrite rod to achieve simultaneous improvement in coupling coefficient and  coil quality factor, allowing maximum energy transfer. The PRU was characterized by  power delivered to the load (PDL) efficiency and experimental verification. The proposed  system requires less than 0.8 W to generate a uniform magnetic field inside a 10.6 L  acrylic cylinder with an induced voltage of 13.9 ± 0.95 to 14.63 ± 4.84 Vrms along the  central axis and near the coil edge, respectively. In this work, a PTE of 23.7 % was  achieved for the proposed PTU with the coil diameter ratio of 0.03, which was significant  when the degree of asymmetry was considered. A measured loss in PTE of ~ 2 % was  observed when the frequency was purposely deviated by ± 10 kHz from the operating  frequency of 185 kHz, suggesting that the proposed PTU could tolerate a shift in  frequency when the load varied. A coupling coefficient of 0.024 was achieved along the  central axis of the transmitter coil at a zero angular misalignment for a receiver coil  quality factor of 74 measured at the switching frequency of 185 kHz. Overall, the  proposed coupler achieves a good coupling coefficient of 0.013-0.034 with a PDL  efficiency of 94.8 % for up to 65 light emitters. When normalized to coil geometry ratio,  the achieved PTE is better than other loosely coupled systems. The LED intensity could  be regulated from 80-380 W/m2, a useful feature in the situation where high intensity  promotes the recombination of electrons and holes. The proposed system has the potential  to address all the issues associated with the conventional reactor designed for the  photocatalytic oxidation of petrochemical wastewater
ER  -