Analysis and Design of High Frequency Gapped Transformers and Planar Transformers in LLC Resonant Converters by Jun Zhang B.E. and M.S., Zhejiang University, China -School of Electrical and Electronic Engineering College of Engineering and Informatics National University of Ireland, Galway

Analysis and Design of High Frequency Gapped Transformers and Planar Transformers in LLC Resonant Converters by Jun Zhang B.E. and M.S., Zhejiang University, China
in fulfilment of the requirements for the degree of Doctor of Philosophy in the subject of Electrical and Electronic Engineering.

Abstract
The LLC resonant converter is particularly applicable for power supplies applications since soft switching is easily achieved. The dual objectives in power supply are higher switching frequencies and higher power densities. The analysis and design of the LLC resonant converter, especially the magnetic components needs further investigation and the related research has enormous practical significance. In this thesis, the design methodology for the LLC resonant converter is proposed based on the circuit analysis and the loss calculations with soft switching conditions and input voltage variations considered. The gapped transformer employed in the resonant converter is deeply investigated. The transformer was treated as the multiwinding inductor and a new design methodology is proposed. The parasitic parameters in the transformer involving high frequency leakage inductance and stray capacitance are studied, and reliable evaluation formulas are presented. With the purpose of introducing the planar transformer in the LLC resonant converter, the detailed modelling of planar transformer including the winding loss calculation, the stray capacitance and the leakage inductance for the integrated planar structure incorporating the low permeability magnetic shunt is carried out. Combing the analytical results of the gapped transformer design method and modelling of the planar transformer, the gapped planar transformer for the LLC resonant converter is designed and fabricated. Comparison with the conventional transformer shows that successful operation is possible with the low profile core.

LINK COMPLETE THESIS
https://aran.library.nuigalway.ie/bitstream/handle/10379/5048/Thesis_Jun.pdf?sequence=1&isAllowed=y

Characterization of high voltage insulation planar transformer and flyback design tool - Jiang YU and Teddy BONNIN - Département Electronique et Energie Spécialité Electronique et systèmes de l’énergie électrique -

Our work is generally composed by two parts: One is experiment and industrializing a high voltage insulation planar transformer the other is designing a flyback database tool. The products range Mors Smitt The MSAVDC (MS stands for representation of the DC current consumed by the railway rolling stock equipment on the catenary lines of supply (750VDC, 1500VDC and 3000VDC). Placed on the roof of the train, this system can be in direct contact with high voltage and ground. Therefore, it must be able to protect the external battery packs in order to ensure the safety of goods and persons on board. Moreover, it must meet the constraints of temperature and humidity which have a direct impact on the behavior of electronics inside the device. According to the principle of shunt measurement, a voltage measurement of the current crossing a portion located in the power bus bar of the train is taking by two resistors. The connections for the measurement are also used to measure the temperature of the copper bus bar in order to correct the temperature drift. The system also includes an auto calibration system. Then, it is possible to calibrate the measurements by integrating the dimension variations of the section of the bus bar. This analog information is converted in digital data form, and then transmitted thanks to an insulated bus between HV1 and LV2 printed circuits boards. It is an asynchronous serial communication type, ensuring a transfer of data bits one at a time, through a single transmission line (TX). The baud rate is set at 500kbits/s (cf. Appendix N°1).

LINK COMPLETE PAPER
http://www.applis.univ-tours.fr/scd/EPU_DMS/2012PFE_Bonnin_YU_DEE.pdf

DC-DC Converter The Flyback DC-DC Converter: The Best Bet for Most SMPS By Dr.-Ing. Artur Seibt, Vienna - BODO´S POWER SYSTEM

LINK ORIGINAL PAPER  PART-1-PAGES 62-69
Electronics in Motion and Conversion October 2016 - Bodo's Power

LINK ORIGINAL PAPER PART-2-PAGES 70-83
Electronics in Motion and Conversion November 2016 - Bodo's Power
http://www.bodospower.com/restricted/downloads/bp_2016_11.pdf

Dr. Arthur Seibt Lagergasse 2/6; A 1030 Wien, Austria Tel. +43-1-505.8186 email: dr.seibt@aon.at http://members.aon.at/aseibt 

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Engineers Week 2017 Message from International Space Station

Publicado em 19 de fev de 2017 Greetings from the International Space Station as they celebrate Engineers Week 2017 with us!

Online Workshop on "LTSpice and Control Loops" -Speaker: Ron Lenk - Date: Thursday, March 16, 2017 Time: 8AM - 2PM PST ​ Location: Online

Date: Thursday, March 16, 2017 Time: 8AM - 2PM PST ​ Location: Online 

 Agenda:​ ​​​ Control loop design for power supplies can be challenging, even for those with a background in analog electronics. Translating from textbook theory to actual designs that can be implemented on a circuit board requires experience that can take years to acquire. ​ In this class we will speed up the process by focusing on practical aspects of simulating and designing control loops for power supplies. In particular, we will be using LTSpice, a free simulator, to compute the necessary feedback system and then verify its design. ​ We start from the basics, explaining practically how to measure the transfer function of the power stage of a power supply. ​ We also spend time showing the basics of LTSpice, and then use it to model the power stage. We look carefully at the potential pitfalls of using modeling. ​ We show how to build both switching models and state-space average models of a power supply in LTSpice. We show how to use the latter to measure the transfer function, and also how to practically do the same thing on the lab bench. ​ We then look at the three main types of feedback control, and build models of these. ​ We combine the two models together and show how to measure the complete transfer function of the power supply, hot to verify its bandwidth and phase margin, and how to do that on the lab bench. ​ Finally, we build a complete switching model of the power supply, and verify its stable performance. ​
​ Who should attend: Power management professionals who want to demystify the control topology to advance their career in their respective areas Marketing and sales people who want to learn the control topology to have a better understanding of the DC-DC converters MS/PhD students who want to learn industry oriented power management knowledge

REGISTER
https://www.learnersplace.com/copy-of-led-system-design-2016-1