Design of Full-bridge DC-DC Converter 311/100 V 1kW with PSPWM Method to Get ZVS Condition

Abstract

Enhancing the switching frequency can increase the power density of a fullbridge dc-dc converter. However, power loss in switches will increase due to the intersection of voltage and current during turn-on and turn-off transition process. The switching power loss can be reduced by making the condition of zero voltage switching (ZVS) which in this study is obtained by using the phase-shifted PWM method. Achieving this condition requires appropriate parameters such as deadtime, leakage inductance, and the primary current of transformer in sufficient value. In this study, ZVS is achieved when the transformer leakage inductance of 14.12 μH is added with external inductance of 24.29 μH which is installed in series with transformer and when the primary current of transformer is more than 1.289 A. Keyword: DC-DC converter High frequency transformer Leakage inductance Paracitic capacitance Zero voltage switching Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Eka Firmansyah, Department of Electrical Engineering and Information Technology, Faculty of Engineering, Universitas Gadjah Mada, Indonesia. Email: eka.firmansyah@gmail.com INTRODUCTIONDC power supply is increasingly being used for various applications such as battery charger (for rechargeable battery in electric vehicles, electronic equipments, energy storage systems in photo-voltaic and wind power plant), induction heating, welding machine, and other applications. DC power supply used and developed today is a switch mode power supply (SMPS). SMPS has been chosen to replace linear power supply because of its higher efficiency, smaller and lighter size [1]- [9].The main part of dc power supply is a dc-dc converter which has various kinds of topology. One of them is full-bridge topology which can be applied to a higher power than the other topologies (≥ 500 W). This topology is development of a buck converter topology with four electronic switches and insulated transformer [10]- [14]. On the development, the converter technology is always strived to improve efficiency as high as possible and with size as small as possible. Some ways to achieve these conditions are developing from hard switching to soft switching method, applying high frequency and selecting component values accordingly [4], [8], [9], [15].One of the frequently used soft switching method is phase-shifted PWM. The aim of that method is to get zero voltage switching (ZVS) condition, at the time of the switch turn-on, the switch will be active when the voltage value is zero. So that the power loss in the switching process can be minimized [2], [16], [17]. The parameters that must be satisfied in order to achieve the ZVS condition are leakage inductance in a sufficient value, deadtime as small as possible and current which is greater than the value required. Leakage inductance value is very dependent on the high-frequency transformer design. Deadtime value is determined by considering the value of rise time, fall time, and delay time of the gate-dr...

Soft Switched Current Fed Dual Active Bridge Isolated Bidirectional Series Resonant DC-DC Converter for Energy Storage Applications

“…The performance of the proposed current fed series resonant dual active bridge converter with inductive output filter is analysed by comparing various losses as shown in Figure 14. The efficiecny of proposed converter at various loads is shown in Figure 15, and efficiency comparison of various topologies [7,8], [10,11] is shown in Figure 16. The current stress of the proposed converter with the existing dual active bridge (DAB) converters of different topologies [7,8], [10,11] is shown in Figure 17.…”

“…The efficiecny of proposed converter at various loads is shown in Figure 15, and efficiency comparison of various topologies [7,8,10,11] is shown in Figure 16. The current stress of the proposed converter with the existing dual active bridge (DAB) converters of different topologies [7,8,10,11] is shown in Figure 17. The conventional DAB converter [7] without resonance achieved 93.5% efficiency at full load and 81% efficiency at 10% of full load.…”

“…Dual active-bridge converters are symmetrical in structure and easy to analyze and control [4][5][6]. In isolated dual active-bridge converters, both voltage-fed non-resonant [7][8][9][10] and resonant [11][12][13][14][15] converters have been discussed. In voltage-fed converters [7,11], the output current has a negative component, which is circulating and incurs more losses.…”

“…Continuous conduction mode without loss of duty cycle, (iii) The circulating current at the load is zero to avoid the current stress on the switches and corresponding losses. Due to their bidirectional power transfer capability and high gain, these converters have become an essential part of the conventional structure of plug-in hybrid electric vehicles [6,10]. Current-fed converters allow solar energy generation utilizing PV with a small voltage output, even for individual households.…”