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Switching driver for high power LEDs with higher efficiency
Doležal, Miroslav ; Háze, Jiří (referee) ; Šteffan, Pavel (advisor)
Problems in swithing converter and power losses in this circuit describe these master’s theses. Power losses have the primar influence on the total effectivity circuit. The first chapter deal swith principle of basic parts switching converter (buck, boost, buck-boost). The power losses on main elements used in switching circuit (diode, transistor) are explained in the next part this thesis. Theory of synchronous rectifiction for reduction of losses. A choice of two integrated circuit useful for future design of LED driver working in buck-boost mode is on the end of the theoretical part. The practical part is fosud on the design of circuits (with integrated circuits chose in the theoretical part) including schematic diagram, calculation of parts and PCB layout. The build samples are evaluated by set of measurements in the field of effeciency, temperatures of components, stability output LED current, EMC and soon. Finally the particular parameters of both tested circuits are compared
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High efficiency control circuits for LEDs
Havlík, Vojtěch ; Máca, Josef (referee) ; Vyroubal, Petr (advisor)
The aim of this diploma thesis is to design two different switching power supply circuits with integrated circuits suitable for controlling of LED. The theoretical part describes the principles of two main switching converters topologies – buck and boost. Furthermore, a universal H-bridge structure of switching supply is described. This is compared with the typical switching supply design. Based on specified requirements, two circuits are designed with selected IO which are suitable for using in the automotive industry. Their function and typical schema are described. In the practical part is realized design with both selected IC, choosing components and layout PCB. Set of tests are carried out with manufactured samples. Based on measured results are performed optimalization of samples, which are tested also. In the end of this thesis both samples are compared in terms of function, efficiency and EMC.
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Automotive LED driver with additional functions
Vlach, Marek ; Duz, Aleksei (referee) ; Šteffan, Pavel (advisor)
In this diploma thesis, the design and construction of a LED driver with additional functions for the automotive industry is carried out to meet its requirements. The LED driver is based on the principle of DC/DC converter in H-bridge topology, which is used to supply a string of power LEDs. The combined function of the daytime running lights and position lights governed by the driver control electronics is then implemented on the LED string. Other additional functions of the driver are temperature regulation of the output current and error reporting in case of a fault condition on the LED string. A set of typical measurements on a manufactured sample including functional tests, efficiency measurements, thermal analysis and EMC testing are employed to verify the driver parameters.
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High efficiency control circuits for LEDs
Havlík, Vojtěch ; Máca, Josef (referee) ; Vyroubal, Petr (advisor)
The aim of this diploma thesis is to design two different switching power supply circuits with integrated circuits suitable for controlling of LED. The theoretical part describes the principles of two main switching converters topologies – buck and boost. Furthermore, a universal H-bridge structure of switching supply is described. This is compared with the typical switching supply design. Based on specified requirements, two circuits are designed with selected IO which are suitable for using in the automotive industry. Their function and typical schema are described. In the practical part is realized design with both selected IC, choosing components and layout PCB. Set of tests are carried out with manufactured samples. Based on measured results are performed optimalization of samples, which are tested also. In the end of this thesis both samples are compared in terms of function, efficiency and EMC.
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Switching driver for high power LEDs with higher efficiency
Doležal, Miroslav ; Háze, Jiří (referee) ; Šteffan, Pavel (advisor)
Problems in swithing converter and power losses in this circuit describe these master’s theses. Power losses have the primar influence on the total effectivity circuit. The first chapter deal swith principle of basic parts switching converter (buck, boost, buck-boost). The power losses on main elements used in switching circuit (diode, transistor) are explained in the next part this thesis. Theory of synchronous rectifiction for reduction of losses. A choice of two integrated circuit useful for future design of LED driver working in buck-boost mode is on the end of the theoretical part. The practical part is fosud on the design of circuits (with integrated circuits chose in the theoretical part) including schematic diagram, calculation of parts and PCB layout. The build samples are evaluated by set of measurements in the field of effeciency, temperatures of components, stability output LED current, EMC and soon. Finally the particular parameters of both tested circuits are compared
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