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Converter for DC motor with sensorless speed control
Hanzl, Ondřej ; Martiš, Jan (referee) ; Tománek, Radek (advisor)
The scope of the work is the design and implementation of a test sample of a converter with sensorless speed control for a DC motor with permanent magnets. The whole device consists of two main parts, namely a two-switch forvard converter, which serves both as a power source with parameters 0 ÷ 60V/0 ÷ 20A for laboratory purposes, and as a power supply for a four-quadrant pulse converter for the speed control of the electric motor. The control of both converters is ensured by digital control circuits. All components are placed on printed circuit boards of standardized dimensions as plug-in modules designed to be built into the instrument cabinet for easy disassembly and accessibility in case of checking measurements.
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DC switching power supply
Látal, Jiří ; Folprecht, Martin (referee) ; Lažek, Tomáš (advisor)
Bachelor’s thesis discusses the design of an adjustable DC/DC converter with an output voltage of 30 V and a current of 10 A. The first part described three basic DC/DC converter topologies and the scheme of power and control structure of the converter. As a suitable topology of power supply was selected a two-switched forward converter. The integrated circuit SG3525ADWR2G was chosen as the PWM modulator for the converter. The second part of the thesis described the design and testing of the switch mode power supply.
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Converter for DC motor with sensorless speed control
Hanzl, Ondřej ; Martiš, Jan (referee) ; Tománek, Radek (advisor)
The scope of work is the design of a converter with sensorless speed control for a DC motor with permanent magnets with a power of 500 W at a voltage of 48 V. The whole device consists of two parts, a single-acting pass converter, which serves as a power supply with parameters 0 ÷ 60 V/0 ÷ 20 A for laboratory purposes, and on the hand as a power supply for a four-quadrant pulse converter for the speed control itself with user settings, electronic reversal of the direction of rotation and motor braking. The control of both inverters is provided by control circuits implemented digitally. All components will then be designed for measuring printed circuits boards of strandardized dimensions as plug-in modules to be built into instrument cabinet for easy disassembly and access in the case of controls.
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Models of DC transistor converters in Simulink program
Loup, Martin ; Pazdera, Ivo (referee) ; Huták, Petr (advisor)
The master’s thesis is focused on the creation of models of DC/DC converters and control program for input parameters and their configuration. The first part is theoretical and she is dedicated to the description of the program Matlab. The second chapter is dedicated to DC/DC converters. Their function is described there and the necessary equations for the design are derived. All of this is complemented by the calculation of line losses in semiconductor elements and the design of voltage and current regulator. The last two parts deal with the description of the created models in Simulink and control program in a graphical environment. The created program is able to edit and recalculate parameters of the converters, calculate line losses on semiconductor components, perform a model simulation or open it.
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Switching benchtop power supply 0-30 V, 0-5 A
Galia, Jan ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
This thesis deals with the design and construction of switching mode power supply for lab application. Convertor is based on the forward topology with adjustable output voltage regulation from 0 to 30V and with maximal output current 5A. Antoher features of this power supply is adjustable current limiting function which can be set from 0 to 5A. For closed loop control was chose analogue cascade regulation.The contol part consists of operation amplifire TL072 and SG3525 contorl circuit.
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Switch mode supplies
Hladík, Jan ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the design of switched power supply for laboratory lessons. Forward converter was chosen as the topology of this power supply. Output voltage is adjustable from 0 V to 32 V. Power supply is capable of output current up to 10 A and output has adjustable current limiting. Following parts were designed: LC filter, pulse transformer, bridge rectifier with capacitor, power MOS-FETs driver, closed loop control with its auxiliary power supply. Cascade closed loop control is used for controlling of designed power supply. Control is analogue, operation amplifiers were used for its construction. PCB was designed for the whole power supply. Power supply was sucessfully assembled and tested.
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Intelligent charger for lead-acid accumulators 12V/130A with an option "start-car"
Láznička, Martin ; Červinka, Dalibor (referee) ; Vorel, Pavel (advisor)
This bachelor's thesis is considered on a basic description of car battery charger with a support function “start-car”. A switching power supply creates a base of the equipment-this is why the charger is compact and easily portable. It is designed for 6V and 12V batteries. A charging by a constant voltage with a current limitation (to 0.5A, 5A or 20A) is used. The charger maximal current is 120A for a short-term load, so a proposal of an appropriate thermal protection is included in the project.
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High power switch-mode supplies - parallel connection
Kadlec, Josef ; Richter, Aleš (referee) ; Mindl,, Pavel (referee) ; Patočka, Miroslav (advisor)
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.
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Current source for measuring purposes
Chevalier, Stanislav ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
Goal of this semestral thesis is to design power converter which is to be used for measurement. The converter consists of two forward converters in push-pull topology. The converter is to behave as a constant current source with maximum open-circuit voltage of 1000V. Maximum current is 5A. The current range is split into three sub-ranges, to meet the strict requirements on ripple current. The range of currents is 0-5A. The operating frequency of converter is 34KHz. The converter will be charged using two portable electric generators with output voltage 230V.
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Power Converter for the electric arc welding
Jaša, Jakub ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the peripheral design, construction design and implementation welder DC arc. The concept of welder is based on the use of two single action forward converter working-pull. Converters operate at a frequency of 60 kHz. Output current can be adjusted in the range from 0 to 140 A. After switching function the welder can operate as a battery charger. Charging current can be adjusted in the range of 0-70 A. The device is powered from a single phase supply 230 V.
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