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Electromagnetic actuator of simple objects
Kolek, Andrej ; Drexler, Petr (referee) ; Hadinec, Michal (advisor)
The main objective of this work is to study the principles of the movement of very small bodies using electromagnetic forces. The first part is acquainted with the theory of electromagnetismand the second part will focus on the already functioning device, called coil gun. In detail in this work id dissambled design, construction and subsquent results of the measurement of this divice.
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Power LED control using ATtiny
Martynek, Tomáš ; Kubánek, David (referee) ; Balík, Miroslav (advisor)
Target of this bachelor’s thesis is to develop suitable DC/DC converter for driving power LED with Atmel Tiny micro. There is PHILIPS white power LED – Luxeon Star/O as the light source used. Micro’s AD converter measures current through this LED. This value is used for current driving using PWM micro output. Whole device is accumulator powered, design allows usage of three AA alkaline batteries instead of NiMH accumulators. During design phase was choosing between 2 and 3 AA batteries power solution. Because of the longest working time, the final solution uses 3 AA batteries – in this configuration works the flashlight about 7 hours. Flashlight can charge NiMH batteries from external constant current power source. Micro controls whole charging process and disconnects accumulators from current source after full charge using method of negative voltage change. Timer method is backup method in case, when negative voltage drop is very small – the charging time is limited to max. 9 hours. Micro can detect bad or non-possible charged cells.
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Electromagnetic actuator of simple objects
Kolek, Andrej ; Drexler, Petr (referee) ; Hadinec, Michal (advisor)
The main objective of this work is to study the principles of the movement of very small bodies using electromagnetic forces. The first part is acquainted with the theory of electromagnetismand the second part will focus on the already functioning device, called coil gun. In detail in this work id dissambled design, construction and subsquent results of the measurement of this divice.
|
|
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Power LED control using ATtiny
Martynek, Tomáš ; Kubánek, David (referee) ; Balík, Miroslav (advisor)
Target of this bachelor’s thesis is to develop suitable DC/DC converter for driving power LED with Atmel Tiny micro. There is PHILIPS white power LED – Luxeon Star/O as the light source used. Micro’s AD converter measures current through this LED. This value is used for current driving using PWM micro output. Whole device is accumulator powered, design allows usage of three AA alkaline batteries instead of NiMH accumulators. During design phase was choosing between 2 and 3 AA batteries power solution. Because of the longest working time, the final solution uses 3 AA batteries – in this configuration works the flashlight about 7 hours. Flashlight can charge NiMH batteries from external constant current power source. Micro controls whole charging process and disconnects accumulators from current source after full charge using method of negative voltage change. Timer method is backup method in case, when negative voltage drop is very small – the charging time is limited to max. 9 hours. Micro can detect bad or non-possible charged cells.
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