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Universal inverter for multi-phase low-voltage drives
Pitner, Tomáš ; Pazdera, Ivo (referee) ; Knobloch, Jan (advisor)
The diploma thesis deals with the design and construction of a six-phase low-voltage high-current inverter. Overall design and calculation of the power components of the inverter including its cooling is performed, along with the control circuitry including the inverter leg drivers, the driver and autonomous control of the brake chopper and the interface circuit between the external control circuit and the drivers. In relation to the power components design, research of current distribution between paralleled MOS-FETs and paralleled inverter legs is conducted, leading to the theory of symmetrizing current transformers, for which numerical simulations and verification measurements are done. The thesis also deals with design of a DC bus capacitor -- dependence of the ESR on frequency and temperature for an electrolytic capacitor is measured and the harmonic spectrum of the capacitor current for SVPWM is calculated by numerical simulation. Finally, the construction of the inverter and its testing and measurements are described.
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Two-quadrant regulated power supply for laboratory purposes
Kalus, Jiří ; Vorel, Pavel (referee) ; Knobloch, Jan (advisor)
The main goal of the bachelor´s thesis is a suggestion of switching power supply with energy absorption for the case of two-quadrant load. The source includes of three parts: the power for the control circuit, single-converter and absorber of the recovered energy. Output power source is 400 W and output voltage 0 to 40 V, current +10 / - 10 A. This bachelor´s thesis deals with the first half of the circuit description and the second part there are analysis and the suggestion. Scheme and printed circuit cards are in attachment.
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Switch mode supplies
Hladík, Jan ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the design of switched power supply for laboratory lessons. Forward converter was chosen as the topology of this power supply. Output voltage is adjustable from 0 V to 32 V. Power supply is capable of output current up to 10 A and output has adjustable current limiting. Following parts were designed: LC filter, pulse transformer, bridge rectifier with capacitor, power MOS-FETs driver, closed loop control with its auxiliary power supply. Cascade closed loop control is used for controlling of designed power supply. Control is analogue, operation amplifiers were used for its construction. PCB was designed for the whole power supply. Power supply was sucessfully assembled and tested.
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Two-quadrant regulated power supply for laboratory purposes
Kalus, Jiří ; Vorel, Pavel (referee) ; Knobloch, Jan (advisor)
The main goal of the bachelor´s thesis is a suggestion of switching power supply with energy absorption for the case of two-quadrant load. The source includes of three parts: the power for the control circuit, single-converter and absorber of the recovered energy. Output power source is 400 W and output voltage 0 to 40 V, current +10 / - 10 A. This bachelor´s thesis deals with the first half of the circuit description and the second part there are analysis and the suggestion. Scheme and printed circuit cards are in attachment.
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Switch mode supplies
Hladík, Jan ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the design of switched power supply for laboratory lessons. Forward converter was chosen as the topology of this power supply. Output voltage is adjustable from 0 V to 32 V. Power supply is capable of output current up to 10 A and output has adjustable current limiting. Following parts were designed: LC filter, pulse transformer, bridge rectifier with capacitor, power MOS-FETs driver, closed loop control with its auxiliary power supply. Cascade closed loop control is used for controlling of designed power supply. Control is analogue, operation amplifiers were used for its construction. PCB was designed for the whole power supply. Power supply was sucessfully assembled and tested.
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