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Analysis of switched-mode LED drivers
Stehlík, Ota ; Vyskočil, Pavel (referee) ; Kubíček, Michal (advisor)
The aim of this thesis is to design, produce and verify the operation of two different LED drivers for automotive industry, which controls the ultra-bright white LEDs. At the beginning of a brief introduction explaining the principle of operation of LEDs. Furthermore theory describes the functions of all three basic drivers involved as buck, boost and buck-boost. Based on the requirements are selected ICs suitable for this implementation, theoretically described their block diagrams including the individual diagrams and eventually these samples are made, revived and measured their parameters.
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Accurate controll of piezoactuator
Hurdálek, Tomáš ; Šifta,, Radim (referee) ; Urban, František (advisor)
This thesis deals with the possibility of current and voltage control of piezoactuators from the point of view of control of optical filters for retuning the optical spectrum. At first, there is an effort to clarify the basic physical principles that are closely related to this issue. The thesis also deals with different types of piezoactuators and determines which one is the most suitable for the application. Attention is also paid to the explanation of different control options. A comparison of available drivers was made. Measurements, circuit simulations and testing of various circuits of critical parts of the driver were made. Based on this, a current driver and a current source to power it were developed. The device has been constructed and tested.
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Analysis of switched-mode LED drivers
Stehlík, Ota ; Vyskočil, Pavel (referee) ; Kubíček, Michal (advisor)
The aim of this thesis is to design, produce and verify the operation of two different LED drivers for automotive industry, which controls the ultra-bright white LEDs. At the beginning of a brief introduction explaining the principle of operation of LEDs. Furthermore theory describes the functions of all three basic drivers involved as buck, boost and buck-boost. Based on the requirements are selected ICs suitable for this implementation, theoretically described their block diagrams including the individual diagrams and eventually these samples are made, revived and measured their parameters.
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