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Energy harvesting demonstrator
Kaděra, Petr ; Mikulášek, Tomáš (referee) ; Mrnka, Michal (advisor)
This semestral thesis is focused on radio frequency energy harvesting. The thesis describe parts of network that are essential for conversion of radio frequency energy into DC. It deals with various solutions to the given problem. The aim of the thesis is to design a proper antenna with supplemental circuits for commercial Powercast P2110B receiver which combines the function of a rectifier and a step-up DC/DC converter.
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Low-frequency active threshold-less voltage detectors
Litovska, Anna ; Theumer, Radek (referee) ; Šotner, Roman (advisor)
This bachelor thesis deals with various solutions of the active topology of voltage detectors and rectifiers that do not use diodes. Specifically, it focuses on discrete detectors with multipliers and voltage-to-current converters, a discrete peak detector with transconductors, and an integrated RMS detector with an AD734 multiplier. This thesis includes theoretical design of parameters of circuits for required features as well as verification by computer analysis (PSpice) and experimental measurement. This work includes documentation for construction of the product, including the block arrangement and the design of the printed circuit board.
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Electronic ballast for power LEDs
Vágner, Richard ; Martiš, Jan (referee) ; Červinka, Dalibor (advisor)
This diploma thesis deals with design of power LED driver. This driver contains electronic ballast circuits, converters, filters and control circuits. Overviews of circuits used in practice are listed along with analysis of power LED and considering options for selecting an appropriate design solution. Thesis describe principle of electroluminescense, creating of the device, its structure and problematics of current source supply. Including detailed overview of converters, ballasts and topologies used in lighting systems with the selection of a suitable solution for the final device with an output power of 50 W. The thesis contains cooling dimensioning for selected power LEDs, input circuit with EMI filter, bridge rectifier, boost converter and flyback converter with pulse transformer.
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Design of extremly low-voltage rectifier in CMOS technology
Musilová, Nikola ; Šteffan, Pavel (referee) ; Khateb, Fabian (advisor)
The aim of this work is to design a low-voltage and low-power rectifier using CMOS technology and an operational amplifier for input voltages in the order of tens of mV, which correspond to sensor and biomedical applications. The circuit allows both half-wave and full-wave rectification. The key parameters are high gain and very low power consumption of the operational amplifiers that make up the rectifier.
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Electronic ballast for power LEDs
Vágner, Richard ; Martiš, Jan (referee) ; Červinka, Dalibor (advisor)
This diploma thesis deals with design of power LED driver. This driver contains electronic ballast circuits, converters, filters and control circuits. Overviews of circuits used in practice are listed along with analysis of power LED and considering options for selecting an appropriate design solution. Principles of creating the device, structure and problems of current source are described in thesis. Including detailed overview of converters, ballasts and topologies used in lighting systems with the selection of a suitable solution for the final device with an output power of 50 W. The thesis includes cooling dimensioning for selected power LEDs, input circuit with EMI filter, bridge rectifier, boost converter and flyback converter with pulse transformer.
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Modular Power Supply for Formula Student
Ščípa, Samuel ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
This bachelor thesis is focused on the theoretical analysis and design of switching power supply with galvanic isolation. The implementation of the design is in the form of the power and control part of the modular power supply. The device parameters are suited for the needs and requirements of the development department of the electric student formula. Design configuration achieves a maximum output voltage of 1000 V and a current of 100 mA, which are user-adjustable.
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DC to DC inverter for backup power supplies
Eliáš, Marek ; Zemánek, Miroslav (referee) ; Boušek, Jaroslav (advisor)
This thesis deals with the design of a DC/DC converter designed for charging supercapacitors from the 36 V voltage source and consequent back transformation of supercapacitors voltage to the required output voltage. In the thesis the designs of decreasing and increasing DC/DC converters including schematics and calculations of individual components are presented and described. The calculations necessary for the supercapacitors to meet the 10Wh energy condition and the voltage balancer on the capacitors are given below. Completely designed equipment will be assembled and tested on supercapacitors with lower energy.
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