Laboratory push – pull switching power supply with symetrical output 2x0-30 V/5 A, primarily through adjustable controls (buttons, rotary encoder position) and then displayed on the alphanumeric LCD display. Management and communication device between the user and the power supply of the microcontroller ATmega32 - 16PU.

The thesis is focused on design the switching power supply according to Push-pull topology rules. The work describes basic theoretic principles of Push-pull topology with design of circuit and circuit elements.

This Master’s thesis is focused on design of voltage converter’s system operating with supply voltage of batteries. There are selected appropriate types of batteries, converter topologies and modes of their control. The specified output branches are systematically divided into three separate modules. Each module is designed in detail with focus on high efficiency. The modules are implemented and optimized. Parameter of final modules were measured and compared with correctness of design and theoretical assumptions.

This master’s thesis deals with the design of the switching power supply on the principle of high frequency converter. The goal of this thesis is construction of converter which is using GaN MOSFET transistors and SiC diodes for switching. The converter uses two switch forward power supply topology. Unusually high switching frequency was chosen for the design with power transformer with open magnetic core. The outcome of this work is functional converter which is primarily intended for educational and demonstrational purposes. Multiple parts of this converter are divided into individual blocks, which can be further used for construction of other types of switching converters.

智慧資本之思潮，源自於北歐，最早發展於瑞典，現今世界各國也相繼投入，其長足發展則在1990年後，而在知識經濟掛帥的年代，其影響到組織的創造與長期競爭優勢，已成為組織最有價值的資產及最有利的競爭武器，而良好的顧客關係就是公司價值具有重大影響的無形資產，也產生顧客資本的價值，若企業能將顧客知識整合到公司流程中，就越能滿足顧客所需要的產品及服務，讓顧客滿意度和忠誠度提高。 本研究選擇個案公司交換式電源供應器之顧客為研究對象，研究目的有四：(一)利用層級分析法找出交換式電源供應器之顧客在選擇供應商時之評選標準及相對權重(二)分析不同貢獻度之顧客在供應商評選標準之權重差異(三)分析不同貢獻度之顧客對個案公司在評選標準上之表現以作為未來顧客關係經營方案的參考(四)對現行交換式電源供應器廠商之顧客資本提出經營建言。 本研究以個案公司交換式電源供應器顧客為問卷對象，並使用層級分析法(AHP)將架構因素設計成問卷，請A、B、C、D等四群顧客依過去顧客期望因素之兩兩比較，得到各層級之各因素在個案公司做顧客期望時的權重。 第一層級研究結果發現，個案公司之四群顧客在顧客期望上，首重品質控制能力與技術設計能力，最不重視地點。 第二、三層級研究結果發現，個案公司之四群顧客在顧客期望上最重視客製化能力、售前諮詢、售後服務、價格水準、產品保證期，而最不重視策略事業關係、過去服務經驗與研究發展支出。 本研究相信，個案公司交換式電源供應器顧客期望透過層級分析法(AHP)的量化分析，找出顧客期望的各因素權重，使企業決策者不會依個人主觀及經驗臆測方式做為決策判斷，而以架構化的決策方式和權重優先次序為依據的客觀方法，相信必能提高顧客滿意度增加公司的經營績效。 / Intellectual Capital originated from North Europe and blossomed in Sweden at the early stage but now the hwole world gets involved. The real expanding was after 1990, now the knowledge-based economy taking the lead, intellectual capital would affect organization’s creative and long-term competitive advantage and also become the most valuable asset and useful weapon. Good customer-relationship is company’s intangible asset and also creates the value of customer capital. If enterprise could compile customers’ knowledge into company’s procedure, it will fulfill customers’ need and increase customers’ satisfaction and loyalty. This research is aimed in the company’s switching power supply’s customers. The main purposes for this research are as follows: 1. Using analytic hierarchy process to figure out the evaluation and relative weighted criteria when customers choosing cuppliers, 2. Analyzing the difference among customers’ who have diverse contribution weighted criteria, 3. By analyzing the difference to generate strategy for future customer relationship maintenance, 4. Offering suggestion to the company operating customer capital. This research is aimed in the company’s switching power supply’s customers with analytic hierarchy process as structure to form the questionnaire. Let A, B, C, D, four groups of customers, to compare two factors each time to get the weighted value for each customer upon each factor. The first tier research comes out that four groups of customers emplyasize quality controla nd technology design ability the most. Disregard location the most. The second and third tiers research come out that customers emplyasize custom, pre-sale consulting, after-sale service, price and guarantee the most. Disregard strategy alliance, previous service experience and RD expense. To conclude, this company could use quantification AHP to rank each customer’s expectation; rather than using subjective judgments or guessing from past experience. I believe this could enhance customer satisfaction well and improve ecompany performance.

Cette thèse étudie les problèmes liés à l’association des principaux composants des réseaux électriques.La nature inductive des éléments à connecter pose des problèmes lors de leur association dans un nœud de connexion commun. Deux solutions sont proposées pour résoudre ce problème et rendre ainsi possible la simulation. Une première solution accepte la présence de causalités dérivées, la deuxième consiste à simplifier les modèles en supprimant localement les régimes dynamiques pour faciliter leur association.La mise en évidence graphique de la causalité dans le modèle global d’un micro réseau à structure variable montre que différentes configurations sont possibles, avec pour chacune un comportement et un fonctionnement différents pour les composants. L’outil bond graph a été choisi pour la modélisation des différents éléments, l’analyse des propriétés des modèles et la conception de lois de commande par modèle inverse à l’aide de la bicausalité. La robustesse de la commande pour le convertisseur d’électronique de puissance est analysée d’une manière classique pour tester ses performances par rapport aux incertitudes paramétriques, en faisant varier la charge connectée au convertisseur. La commande est validée par simulation et de manière expérimentale / This thesis concerns the problem linked to the association of the main components of an electrical network.The inductive nature of the elements to be connected involved some problems for their association through a common connection node. Two solutions are proposed to solve this problem and thus make possible the simulation. One solution accepts the presence of derivative causality in the global model, the second one consists in simplifying the models by removing locally dynamic modes to facilitate their association.The graphical description of causality in the global model of a micro grid with variable structure shows up that different configurations are possible, with different behavior and functioning for the components in each case.The bond graph tool has been chosen for modeling the different components, analyzing the model properties and designing control laws based on inverse models derived from bicausal bond graph. Robustness to parameter uncertainties of the electronic power converter control law is analyzed in a traditional way, by varying the load connected to the power converter. The control law is validated by simulation and experimentally

This work deals with theory of switched power sources. There is description of the ways for connection and their practice purposes. In the next parts there are defined requirements on input supply circuit for these sources, especially for the form of output current. There are mentioned the basic connecting methods of PFC circuits and these methods modify the output current to meet the requirements of specification ČSN EN 61000- 3- 2. In the next parts there are shown simulations of PFC circuits made by Pspice application. Further is the basic description of sources construction for the sources which were used for testing and measuring. The final part deals with evaluation of the measuring on the chosen computer’s source. It compares between the manufacturer’s solutions and PFC circuit made by ourselves.

The aim of this master’s thesis is provide detailed information about car battery’s charger with a switching power supply. The kind of this power supply is one-pulsed conducting inverter with transformer. The charger’s rates of nominal voltage are 6 and 12 V. The method of charging is charging by constantly voltage with a current limitation. The values of a current limitations are 0.5A, 5A and 20A. The charger’s maximal current is 50A. This current can help to the accumulator with starting of a vehicle. This device is equipped by indicators which indicate the end of charging.

Master thesis deals with design controllable switching power source. Device is supplied and controlled via USB bus of PC. The required output parameters are specified by user in a computer application. The teoretical part includes method of USB communication and introduction to switching power sources with focus on a Sepic topologii. The practical part describe individual circuit solution which contains of a complete device. Is analyzed in detail the proposal Sepic converter circuit and controling by microcontroller. The work also includes the design of microcontroller and computer applications. The result of this thesis is a functional device on which is the performed measurement.

In present days there is no scientific laboratory without quality, adjustable and powerful source of voltage and current. Therefore this thesis is focused on creating such power source, which can provide voltage and current high enough for most of experiments or for development electrical devices or parts, which are not connected to power grid. This power source is able to provide symmetric voltage 30 V and current 6 A high in each branch. It is possible to control this power source remotely thanks for USB interface, which is standard equipment of majority of modern devices in these days. LCD display is part of this source, which shows the user set and real parameters at the output as well.