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Digital controlled resistor
Sedlář, Petr ; Petržela, Jiří (referee) ; Šotner, Roman (advisor)
This master´s thesis deals with the design of the control circuits for digital potentiometers and their application in analog systems. Digital potentiometers are three-terminal resistors with an adjustable center connection. The digital potentiomneters enable to drive logic gates, LED drivers, LCD drivers, analog switches etc. Controlling of these mentioned devices is possible by the I2C 2- wire serial bus (invented by Philips). The digital potentiometers are used to control of the primary parameters like cut-off frequency and quality factor in the state variable filter and cut-off frequency in a passive filter. Both filters are simulated in PSpice and then compared with the measured results. Next parts of this master's thesis are a computer program and a exemplary protocol.
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Parameter analysis of induction motor equivalent circuits
Minks, Ondřej ; Běloušek, Radim (referee) ; Mach, Martin (advisor)
This work deals with the determination of the parameters of induction motor equivalent circuits in T-network, gamma-network and inverted gamma-network form from no-load test and discovering voltage dependence of these parameters. For each of these circuits are determined dependencies of the torque and the stator current on the slip. Using the MATLAB simulations, the theoretically derived dependencies are compared with real, which are measured on the motor with the squirrel-cage rotor with power 0,6 kW, 2p = 2, both in operating and in whole motor area.
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Parameter analysis of induction motor equivalent circuits
Minks, Ondřej ; Běloušek, Radim (referee) ; Mach, Martin (advisor)
This work deals with the determination of the parameters of induction motor equivalent circuits in T-network, gamma-network and inverted gamma-network form from no-load test and discovering voltage dependence of these parameters. For each of these circuits are determined dependencies of the torque and the stator current on the slip. Using the MATLAB simulations, the theoretically derived dependencies are compared with real, which are measured on the motor with the squirrel-cage rotor with power 0,6 kW, 2p = 2, both in operating and in whole motor area.
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Digital controlled resistor
Sedlář, Petr ; Petržela, Jiří (referee) ; Šotner, Roman (advisor)
This master´s thesis deals with the design of the control circuits for digital potentiometers and their application in analog systems. Digital potentiometers are three-terminal resistors with an adjustable center connection. The digital potentiomneters enable to drive logic gates, LED drivers, LCD drivers, analog switches etc. Controlling of these mentioned devices is possible by the I2C 2- wire serial bus (invented by Philips). The digital potentiometers are used to control of the primary parameters like cut-off frequency and quality factor in the state variable filter and cut-off frequency in a passive filter. Both filters are simulated in PSpice and then compared with the measured results. Next parts of this master's thesis are a computer program and a exemplary protocol.
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