Thesis Defense - Samet Kurt (MSEE)

Samet KURT – M.Sc. Electrical and Electronics

Asst. Prof. Göktürk Poyrazoğlu– Advisor

Date: 09.06.2021

Time: 15:00

Location: This meeting will be held ONLINE. Please send an e-mail to gizem.bakir@ozyegin.edu.tr in order to participate in this defense.

Slim Design of Power Supply Unit for OLED TV by Using Half Bridge LLC Resonant Converter Topology

Thesis Committee:

Asst. Prof. Göktürk Poyrazoğlu, Özyeğin University

Asst.  Prof.  Kadir Durak, Özyeğin University

Asst.  Prof.  Abdul Balıkcı, Dokuz Eylül University

Abstract:

Recently, with the development of technology, televisions that have different structures and features have been developed in the field of TV. Tv technologies such as  QLED,  Mini-led, and  OLED,  which are developed as rivals to traditional  LEDTVs,  continue to become widespread in the market every day.   OLED TVs do not have a backlight structure, and each pixel is radiated by itself, it enables a thinner design.  Since each pixel is spontaneously luminous, it provides good picture quality and allows to see blacks more black and colors more clearly.  OLED TV panels are generally supplied in the 20-28V voltage range.   Higher power consumption is required with higher luminance and nits values increasing every day.   Power cards have certain mechanical limitations in design, such as thin TV design and a limit of a specific area.  As a result, there is a need for a high-efficiency card design that can operate reliably at high currents.   The power supply is designed under three main blocks that is EMI filter and rectifier stage, interleaved PFC stage, half-bridge LLC converter stage.   The filter block structure is as C-L-C-L-C.  An interleaved PFC block that has 390V output voltage is designed to transfer high power.  For the PFC stage, the efficiency is aimed at %95. Temperature comparison has been made with different transformer types on the half-bridge LLC resonant converter.  The advantages and disadvantages of using EFD and toroidal cores have been determined.  EFD type core is an integrated transformer.  When using a toroidal transformer, the extra series resonant coil is used to dissipate the heating.  In this way, high power is transferred with a toroidal transformer. The asynchronous rectifier is used on the secondary side to increase efficiency.LLC resonant converter stage efficiency is aimed at %96.  For the power supply, the input voltage range is between 100VAC-270VAC, and the output power is 384W in 24V@16A.

Bio: 

Samet Kurt was born in Istanbul/Turkey on 1st August 1996. He graduated from Samsun Salıpazarı High School with the top honor in 2014. Then, he had a B.Sc degree in electrical and electronics engineering from Dokuz Eylul University in 2019. He joined the Power Electronics Design team at Vestel R&D in august of 2019.  He has worked currently as a hardware design engineer. He participated in different power electronics projects which are AC/DC and DC/DC converter for consumer electronics.