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Lab power supply 0-100 V / 0-100 mA
Hanzl, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The thesis deals with the design of a laboratory source of atypical parameters of the voltage range 0 – 100 V and current 0 – 100 mA, which will be used for testing LEDs, measuring the reverse voltage and characteristics of Zener diodes of unknown data. The power supply will operate in linear mode, where the output part make up a power unipolar transistor controlled by a controlled bipolar transistor. The control section controlling this output stage is a closed control loop with two PI controllers, a differential amplifier and a controlled limiter. In the control circuit, the controllers are arranged in a cascade structure, where the voltage regulator is superior to the current one. Power supply is provided by 2 transformers, one for the power part and the other for the control part. All designed and assembled components will be then placed in a box equipped with a digital measuring device with display.
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RF power meter
Hlaváč, Štěpán ; Jedlička,, Petr (referee) ; Drexler, Petr (advisor)
This master’s thesis describes various principles of measurement of electromagnetic waves in a free space and on a line. Used sensors and their real parameters are given for every method. The analysis of protections of high-frequency inputs of measuring instruments is done here and the most suitable method and protections of input for realization are chosen. The analysis of design of secondary protection of high-frequency input is done in this project. The protection of input is realized and measured. The suitable method of measurement is chosen as well as the sensor for measurement of power. The block diagram and circuit diagram of the meter of power are designed. According to designed conception the measuring instrument for measurement of power is realized and its single qualities are measured during the realization. In the final part its precision is measured and the evaluation of results is done.
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Testing of Surge Arresters
Jeřábek, Lukáš ; Paar, Martin (referee) ; Krbal, Michal (advisor)
This bachelor's thesis is devoted to metal oxide surge arresters. After historical and theoretical introduction, which explains their principles and describes their characteristical properties, analysis of the standard IEC 60099-4 and testing according to the standard with focus on the type tests follows. This chapter is also amended with review of the standard's imperfections and with its most probable future development. The work concludes with a market survey, a review of the largest manufacturers and a comparison of their products.
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Diode shaping circuit examples for educational purposes
Kasatkin, Alexey ; Petržela, Jiří (referee) ; Šotner, Roman (advisor)
Tato bakalářská práce je věnována návrhu a realizaci diodového obvodu tvarovače a diodových omezovačů obou polarity s různými zapojeními pro laboratorní. Prvním z nich je tří segmentový obvod tvarovače s aktivním prvkem (operačním zesilovačem). Obvod převádí trojúhelníkový signál na harmonický signál. Druhým obvodem je vykrajovač s proudovým sledovačem, který signál na výstupu odřízne. Třetí je jednoduchý omezovač s nezávislým nastavením úrovně omezení. Cílem konstrukce bylo dosáhnout co nejmenšího zkreslení signálu na výstupu. Funkčnost obvodů byla ověřena simulací a měřením.
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Lab power supply 0-100 V / 0-100 mA
Hanzl, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The thesis deals with the design of a laboratory source of atypical parameters of the voltage range 0 – 100 V and current 0 – 100 mA, which will be used for testing LEDs, measuring the reverse voltage and characteristics of Zener diodes of unknown data. The power supply will operate in linear mode, where the output part make up a power unipolar transistor controlled by a controlled bipolar transistor. The control section controlling this output stage is a closed control loop with two PI controllers, a differential amplifier and a controlled limiter. In the control circuit, the controllers are arranged in a cascade structure, where the voltage regulator is superior to the current one. Power supply is provided by 2 transformers, one for the power part and the other for the control part. All designed and assembled components will be then placed in a box equipped with a digital measuring device with display.
|
|
|
Testing of Surge Arresters
Jeřábek, Lukáš ; Paar, Martin (referee) ; Krbal, Michal (advisor)
This bachelor's thesis is devoted to metal oxide surge arresters. After historical and theoretical introduction, which explains their principles and describes their characteristical properties, analysis of the standard IEC 60099-4 and testing according to the standard with focus on the type tests follows. This chapter is also amended with review of the standard's imperfections and with its most probable future development. The work concludes with a market survey, a review of the largest manufacturers and a comparison of their products.
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|
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RF power meter
Hlaváč, Štěpán ; Jedlička,, Petr (referee) ; Drexler, Petr (advisor)
This master’s thesis describes various principles of measurement of electromagnetic waves in a free space and on a line. Used sensors and their real parameters are given for every method. The analysis of protections of high-frequency inputs of measuring instruments is done here and the most suitable method and protections of input for realization are chosen. The analysis of design of secondary protection of high-frequency input is done in this project. The protection of input is realized and measured. The suitable method of measurement is chosen as well as the sensor for measurement of power. The block diagram and circuit diagram of the meter of power are designed. According to designed conception the measuring instrument for measurement of power is realized and its single qualities are measured during the realization. In the final part its precision is measured and the evaluation of results is done.
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