A HIGH EFFICIENCY SINGLE STAGE FLYBACK CONVERTER FOR PLAMA DISPLAY PANEL PDP SUSTAINING POWER MODULE

A High Efficiency Single-Stage Flyback Converter for PDP Sustaining Power Module Kwang Min Yoo Dept.of Electronics and Computer Engineering Graduate School 
Dankook University  Advisor:Prof.Sung KyooLim 
ABSTRACT
Since AC PDP was invented atthe University ofIllinois in 1964,thePDP technology hasbeen developed remarkably and itsuccessfully entered FlatPanelDisplay(FPD)marketthanks toitsattractivemeritssuch aswideview angle,largescreen, high brightness,and thinness.PDP market-share becomes to bewiden in largesizedisplay marketbutitscostisstillhigh to compete with other FPDs,which is the most important issue left in PDP to be solved. The operation of PDP is divided into threeperiodsofsetup,addressing,and sustaining and its brightness information is defined by sustain pulse number.The sustaining power module takes charge of total power over 80% for sustaining operation. PDP power consumption is controlled by changing the total sustain number according to displayed images due to the low panel efficiency, which causes that the load current drawn by driving circuitis varying according to subfield changes and displayedimages.Consequently itisrequiredthatPDP sustain power supply should have good voltage regulations under dynamic load changes because the image qualities and discharge margins are seriously affected by the sustain voltage.To meet the requirements,one of the most widely used methods is two-stage method.Ithas cascade structure comprised of harmonic preregulator to reduce input current harmonics and DC/DC converterto regulate a outputvoltage. In this paper, a low cost PDP sustain power supply is proposed based on flyback topology. By using Boundary Conduction Mode(BCM) to control input current regulation, DCM condition can be metunderallload conditions.
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Evaluation of Efficiency of Active Clamp Dual Flyback Inverter for Photovoltaic Systems using Simulation Method

Evaluation of Efficiency of Active Clamp Dual Flyback Inverter for Photovoltaic Systems using Simulation Method
R. Šul, B. Dobrucký
University of Zilina, Univerzitna 1, 010 21 Zilina, Slovak Republic, e-mails: sul@fel.uniza.sk, dobrucky@fel.uniza.sk
P. Čerňan
Clayton Power R&D, s.r.o, Legionarska 7158/5, SK911 01 Trencin, Slovak Republic, e-mail: pc@claytonpower.com
Introduction
Dual flyback inverter (DFBI) is one of the preferred topologies for isolated low cost low power photovoltaic (PV) applications. It converts PV cells DC voltage to output AC voltage using single power stage. It is important to understand loss distribution of DFBI be able to reach efficiency limits of this topology. This paper evaluates the efficiency of DFBI based on computer simulation results worked-out by Simetrix circuit simulator.

Power Loss Calculation of High Frequency Transformers

Journal of Electrical Engineering & Technology, Vol. 1, No. 3, pp. 338~342, 2006
Geun-Soo Choi*, Shin-Yong Yoon*, Soo-Hyun Baek** and Kim Yong**
Abstract – This paper analyzed the power loss of transformers considering the magnetic component.
For this, each winding strategy and the effect of air gap between the ferrite core have been an
important variable for optimal parameter calculation. Inductors are very well known design rules to
devise, but the performance of the flyback converter as a function of transformer winding strategy has
not been fully developed. The transformer analysis tool used was PExpert. The influence of the
insulator thickness, effect of the air gap, how the window height and variation of the capacitive value
effects the coil and insulator materials are some of parameters that have been analyzed in this work.
The parameter analysis is calculated to a high frequency of 48[kHz]. Therefore, the final goal of this
paper was to calculate and adjust the parameters according to the method of winding array and air gap
minimizing the power loss.

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