The aim of this master’s thesis was to analyze the contemporary electronic throttles and the requirements imposed on them. Then to build the mathematical model, identify parameters of the given electronic throttle, proceed the verification and on its basis to build the simulation model. There were selected suitable control and high power components to control the electronic throttle. Due to the knowledge of these parameters the simulation model was extended. For this extended simulation model was designed the position cascade controller with speed and current control loop. Using the designed controller the implementation of the electronic throttle control and the available high power and control module was realized.

This doctoral thesis deals with the issue of high power switched-mode power supplies that are designed as modular systems. The thesis describes series, parallel and series-parallel possibility of connected converters. System can achieve extremely high output current for converters connected in parallel. For converters connected in series, the system can achieve extremely high output voltage. The main goal of this thesis is to develop so-called reconfigurable modular system. It is a system that can change converters connection of serial, parallel or series-parallel connection - during its operation. This option to change converters connection significantly extends the control range of output voltage and output current of the whole system. For all these mentioned variants of the modular system there are described and simulated suitable control schemes. The issue of interleaved PWM is described in the thesis. Output voltage ripple and current ripple equations were derived for each converters connection. These equations, which were derived either for systems with interleaved PWM or for systems without of phase shifted PWM, are also proved by simulations. Design of reconfigurable modular system with power of 9.6 kW that contains four converters was introduced in this thesis. Converters use modern transistors and diodes of SiC material. The proposed reconfigurable modular system was successfully manufactured. The measurement results are also shown in the work.

The master´s thesis deals with theoretical research and practical application of the principle of spreading acoustic waves through nonlinear medium. The theoretical part describes five different types of amplitude modulation and their mathematic representation, which were verified by the program Matlab. Next, the impedance characteristic of ultrasound PZT transducer was measured and the design of PWM modulator and class D amplifier was described. The practical part of the master´s thesis contains the realization of the parametric loudspeaker assembled from the class D amplifier and the PWM modulator. In conclusion, the designed parametric loudspeaker was measured and the individual types of amplitude modulation were compared with respect to the total harmonic distortion of transmitted useful signal.

No description available.

<p>Dat je pregled mogućnosti za povišenje energetske efikasnosti<br />pneumatskog programabilnog manipulatora primenjenog u kontaktnim<br />zadacima. Projektovano je i realizovano ispitno postrojenje. Posebno<br />je ukazano na mogućnosti projektovanja različitih upravljačkih<br />sistema. Razvijeni su primeri PWM i proporcionalnog upravljanja.<br />Ispitana su predložena rešenja iz različitih aspekata energetske<br />efikasnosti i kvaliteta praćenja trajektorije pri korišćenju<br />različitih vrsta materijala i alata. Izvučeni su potrebni zaključci.</p> / <p>This paper contains an overview of possibilities for increasing the energy<br />efficiency of programmable pneumatic manipulator in contact tasks.<br />Experimental station is designed and realized as a testbed. Especially, point<br />is on possibilities of designing of new control systems. Examples of PWM<br />and proportional control are developed. Proposed solutions are examined<br />from aspects of energy efficiency and quality of trajectory tracking, by using<br />various types of materials and tools. Necessary conclusions are drawn.</p>

Os elevados níveis de potência e desempenho solicitados pelas presentes e futuras aplicações de conversores estáticos de potência podem ser atingidos pela interconexão de unidades básicas menores (multiconversor). Com a utilização de uma estratégia de controle adequada consegue-se não apenas a potência total desejada e sua correta divisão entre as várias unidades básicas como também uma redução no conteúdo harmônico das correntes e tensões resultantes. Neste trabalho, algumas topologias de multiconversores monofásicos do tipo fonte de tensão são modeladas, analisadas e comparadas quanto às solicitações de corrente e tensão nos diversos componentes, e quanto ao espectro da corrente resultante. Desta discussão conclui-se que a \"Conexão em Paralelo de Conversores Sem Transformador\" (PCTL- parallel connection/transformerless) é viável, levando-se em conta as demais topologias e a tecnologia disponível em semicondutores de potência. A análise do modelo matemático e da matriz de controlabilidade do caso PCTL trifásico resulta em métodos de desacoplamento das entradas do multiconversor. Baseando-se nestes métodos, são propostas três estratégias de controle utilizando controladores de corrente monofásicos individuais. Dois deles utilizam PWM com portadora triangular, e o outro, um PWM por banda de tolerância. Para um dos casos, baseados em PWM a portadora triangular, propõe-se um processo de minimização de harmônicos de corrente, injetando-se à referência de cada modulador PWM um sinal de \"seqüência zero instantânea\", obtido a partir da solução de um problema de otimização. Para o caso baseado em banda de tolerância, conseguem-se satisfazer os critérios de desacoplamento pela sincronização e igual defasagem das funções de chaveamento dos diversos conversores via malhas PLL, e também pela injeção de uma corrente fictícia de \"seqüência zero instantânea\" às referências do controlador de corrente. Para os controladores propostos, discute-se a operação do PCTL durante a ocorrência de falhas ou manutenção. Apenas os conversores do tipo fonte de tensão são abordados neste trabalho. / The high power and performance levels required for the present and future power electronics converters can be achieved by connecting a set of smaller power units (multiconverter). By using appropriate control, not only perfect sharing of the power among the converters, but also harmonics reduction is obtained. This thesis presents, analyses and compares some multiconverter topologies, based on the values of the voltages and currents in the main components and in the spectra of the resulting current. As a result, the transformerless parallel connection of converters PCTL is shown to be a feasible solution, taking into account the existing power devices technology. The analysis of the three phase PCTL model and its controllability matrix suggests methods for decoupling the PCTL inputs. This results in two methods using carrier based current controller and one method using a \"tolerance band (TB)\" based controller. For the carrier based one, the injection of an optimized zero sequence reference voltage produces a reduction in the ripple of the individual currents. For the tolerance based one, the inputs coupling is reduced by the use of PLL synchronized PWM and by the injection of a \"fictitious zero sequence current in the TB controller. The operation of the PCTL under faults and maintenance condition is discussed. Only the voltage source converter is studied here.

Os elevados níveis de potência e desempenho solicitados pelas presentes e futuras aplicações de conversores estáticos de potência podem ser atingidos pela interconexão de unidades básicas menores (multiconversor). Com a utilização de uma estratégia de controle adequada consegue-se não apenas a potência total desejada e sua correta divisão entre as várias unidades básicas como também uma redução no conteúdo harmônico das correntes e tensões resultantes. Neste trabalho, algumas topologias de multiconversores monofásicos do tipo fonte de tensão são modeladas, analisadas e comparadas quanto às solicitações de corrente e tensão nos diversos componentes, e quanto ao espectro da corrente resultante. Desta discussão conclui-se que a \"Conexão em Paralelo de Conversores Sem Transformador\" (PCTL- parallel connection/transformerless) é viável, levando-se em conta as demais topologias e a tecnologia disponível em semicondutores de potência. A análise do modelo matemático e da matriz de controlabilidade do caso PCTL trifásico resulta em métodos de desacoplamento das entradas do multiconversor. Baseando-se nestes métodos, são propostas três estratégias de controle utilizando controladores de corrente monofásicos individuais. Dois deles utilizam PWM com portadora triangular, e o outro, um PWM por banda de tolerância. Para um dos casos, baseados em PWM a portadora triangular, propõe-se um processo de minimização de harmônicos de corrente, injetando-se à referência de cada modulador PWM um sinal de \"seqüência zero instantânea\", obtido a partir da solução de um problema de otimização. Para o caso baseado em banda de tolerância, conseguem-se satisfazer os critérios de desacoplamento pela sincronização e igual defasagem das funções de chaveamento dos diversos conversores via malhas PLL, e também pela injeção de uma corrente fictícia de \"seqüência zero instantânea\" às referências do controlador de corrente. Para os controladores propostos, discute-se a operação do PCTL durante a ocorrência de falhas ou manutenção. Apenas os conversores do tipo fonte de tensão são abordados neste trabalho. / The high power and performance levels required for the present and future power electronics converters can be achieved by connecting a set of smaller power units (multiconverter). By using appropriate control, not only perfect sharing of the power among the converters, but also harmonics reduction is obtained. This thesis presents, analyses and compares some multiconverter topologies, based on the values of the voltages and currents in the main components and in the spectra of the resulting current. As a result, the transformerless parallel connection of converters PCTL is shown to be a feasible solution, taking into account the existing power devices technology. The analysis of the three phase PCTL model and its controllability matrix suggests methods for decoupling the PCTL inputs. This results in two methods using carrier based current controller and one method using a \"tolerance band (TB)\" based controller. For the carrier based one, the injection of an optimized zero sequence reference voltage produces a reduction in the ripple of the individual currents. For the tolerance based one, the inputs coupling is reduced by the use of PLL synchronized PWM and by the injection of a \"fictitious zero sequence current in the TB controller. The operation of the PCTL under faults and maintenance condition is discussed. Only the voltage source converter is studied here.

In conventional three-phase PWM (Pulse Width Modulation) current source converter based STATCOM (Static Synchronous Compensator) applications, DC link current is kept constant at a predefined value and the reactive power of STATCOM is controlled by varying modulation index. This control strategy causes unnecessary power losses especially when the reactive power of STATCOM is low. For this purpose, in order to reduce the active power drawn by STATCOM, the modulation index can be maximized by adjusting DC link current. Within the scope of this thesis, an adaptive control of DC link current will be designed and applied to a 0.4kV 50kVAr three phase current source converter based STATCOM so that the power losses can be reduced. The theoretical work will be compared and discussed with the experimental results.

The objective of this thesis is to design and implement a velocity-stabilizing driver for permanent magnet synchronous motor. The research presents how to achieve high efficiency in stabilizing overall velocity for a permanent magnet synchronous motor. In order to drive the integral system, there are six steps square-wave starting device, sine-wave driver, estimation of magnetic angle, velocity feedback and current feedback control circuits designed. A test platform is built by Microchip-made dsPIC33FJ128MC804 digital signal processor used as a control core. ¡§Simulink¡¨ simulator is used during the laboratory test. The simulation results are compared with those of experiments in order to verify the achievement of excellent performance of Robust Integral Velocity-stabilizing Controller on Permanent Magnet Synchronous Motor Driver.

In the thesis, we apply the state average method to model the time-average linear dynamic equation, which is used to design a gain scheduled linear quadratic optimal controller. Because the standard modulation method of the twin-buck converter is PFM(Pulse-Frequency Modulation) and twin-buck converter owns the soft-switching characteristic, the voltage step-down ratio, that is, control force can not be lowered less than 0.5. For expanding the range of control force of converter, we modulate the converter by means of mixed modulation of PWM/PFM. With the former odulation method, we have to calculate the discharging time of synchronous switch taken by controller to achieve zero-voltage-transition (ZVT). In the last part of this thesis, we verify the practicability of the controller and modulation method through soft simulation coded by MATLAB and hardware implementation of FPGA driven by Verilog.