Design and implementation of an unregulated DC-DC transformer module using LLC resonant converter

Download

index.pdf

Date

2016

Author

Alemdar, Öztürk Şahin

Metadata

Show full item record

Item Usage Stats

427
views

163
downloads

A traditional high-power front-end DC-DC converter can be replaced with an array of paralleled standardized converter modules when modular design is applied. Modular front-end DC-DC converters represent many desirable properties such as expandability of output power capacity, redundancy implementation, simplified thermal management, and reduced design cost. However, in order to benefit from modular design, load current sharing must be accomplished among the paralleled modules. In this thesis, an LLC resonant converter is proposed as an unregulated DC-DC transformer (DCX) module for modular front-end DC-DC converter applications. In order to achieve current sharing capability, the droop current sharing method is employed in the LLC DCX module. To implement the droop method, both voltage feedback loop of the converter and inherent gain characteristic of the LLC resonant converter topology are utilized. To select the circuit components of the proposed module, a methodical design process is presented. Practical design considerations including planar transformer implementation, secondary-side rectifier selection, primary-side MOSFET selection and control loop implementation are investigated. A 500kHz 200W LLC DCX module converting 360-400VDC input to 12.5-11.75VDC output is built and its performance characteristics are demonstrated. The dimension of the module is 106mm × 61mm × 13mm and it achieves 89.9% efficiency at full load. A two-module array 400W front-end DC-DC converter and a three-module 400W front-end DC-DC converter having 2+1 redundancy configuration are implemented to demonstrate both steady-state and transient current sharing performance of the proposed module.

Subject Keywords

DC-to-DC converters., Electric current converters., Electric power supplies to apparatus.

URI

http://etd.lib.metu.edu.tr/upload/12620665/index.pdf
https://hdl.handle.net/11511/26203

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Design and implementation of an unregulated DC DC transformer DCX module using LLC resonant converter Alemdar, Şahin; Keysan, Ozan (2016-08-20) Traditional high-power centralized front-end DC/DC converter can be replaced with an array of paralleled standardized DC/DC transformer (DCX) modules when load current sharing is accomplished between individual modules. In this study, an LLC resonant converter is proposed as an unregulated DCX module, which has current sharing capability. Current sharing feature is implemented by using the droop current sharing method. A methodical design process is presented for the selection of the resonant tank component...
Design and implementation of Z-source full-bridge DC/DC converter Uçar, Aycan; Ersak, Aydın; Department of Electrical and Electronics Engineering (2012) In this work, the operating modes and characteristics of a Z-source full-bridge dc/dc converter are investigated. The mathematical analysis of the converter in continuous conduction mode, CCM and discontinuous conduction mode-2, DCM-2 operations is conducted. The transfer functions are derived for CCM and DCM-2 operation and validated by the simulation. The current mode controller of the converter is designed and its performance is checked in the simulation. The component waveforms in CCM and DCM-2 modes of...
Design and implementation of a voltage source converter based statcom for reactive power compensation and harmonic filtering Çetin, Alper; Ermiş, Muammer; Department of Electrical and Electronics Engineering (2007) In this thesis, design and implementation of a distribution-type, voltage source converter (VSC) based static synchronous compensator (D-STATCOM) having the simplest converter and coupling transformer topologies have been carried out. The VSC STATCOM is composed of a +/- 750 kVAr full-bridge VSC employing selective harmonic elimination technique, a low-pass input filter, and a /Y connected coupling transformer for connection to medium voltage bus. The power stage of VSC based STATCOM is composed of water-co...
Design and implementation of variable frequency sine wave output buck-boost inverter Şener, Yunus; Ertan, Hulusi Bülent; Department of Electrical and Electronics Engineering (2016) Conventional inverters have pulse-width-modulated output with a fundamental component at the desired frequency and magnitude. These converters are usually buck type and therefore the DC link voltage limits the maximum 3-phase output voltage magnitude. As a consequence, in motor drive applications field weakening is essential after a certain frequency of operation, as it becomes impossible to preserve the rated flux level. In renewable energy applications similar problems arise. When the DC link voltage fall...
Design and implementation of a current source converter based statcom for reactive power compensation Bilgin, Hazım Faruk; Ermiş, Muammer; Department of Electrical and Electronics Engineering (2007) This research work is devoted to the analysis, design and development of the first medium power Current-Source Converter (CSC) based distribution-type Static Synchronous Compensator (D-STATCOM) with simplest converter topology and coupling transformer connection. The developed CSC-D-STATCOM includes a +/-750kVAr full-bridge CSC employing Selective Harmonic Elimination Method (SHEM), a 250kVAr low-pass input filter at 1kV voltage level, and a Δ/Y connected coupling transformer for connection to medium-voltag...

Citation Formats

Ö. Ş. Alemdar, “Design and implementation of an unregulated DC-DC transformer module using LLC resonant converter,” M.S. - Master of Science, Middle East Technical University, 2016.