1. Power Semiconductor Systems II
Author: Ales Havel
Phone: 5937
Office: EA333
Web:
Power Semiconductor Systems II

2. Content of the presentation
Main types of frequency converters
AC-DC converters
DC-DC converters
DC-AC converters
AC-AC converters
Direct frequency converters
Cycloconverters
Indirect frequency converters
Converters with voltage type of the DC link
Converters with current type of the DC link

3. Power converters
A power semiconductor converter is an electrical device for converting electrical energy.

4. Converters with voltage type of the DC link
General characteristics:
Creation of output AC voltage with utilization of the voltage type of the DC link
Regulation of output values (voltage, current, frequency) by the output power inverter
Filtration of the voltage in the DC link by the capacitor battery
Relatively easy control algorithms due to small number of switches
High dynamics, possibility of high switching frequencies
MOSFETs for low power, IGBT for medium power and IGCT or GTO for high power applications
6-pulse diode rectifier or
4-quadrant pulse voltage rectifier
3 phase voltage inverter

5. Converters with voltage type of the DC link
Indirect frequency converter with 6-pulse diode rectifier and voltage inverter
Indirect frequency converter with 4-quadrant pulse voltage rectifier and voltage inverter

6. Converters with voltage type of the DC link
Switching frequency 0.5kHz
Switching frequency 10kHz

7. Converters with current type of the DC link
General characteristics:
Creation of output AC current with utilization of the current type of the DC link
Regulation of output values (voltage, current, frequency) by the output power inverter
Filtration of the current in the DC link by the power coil
Relatively easy control algorithms due to small number of switches
High dynamics, possibility of medium and high switching frequencies
High power applications, utilization of IGBT, GTO and IGCT power parts
The absence of higher harmonics, controlled power factor
6-pulse thyristor rectifier or
4-quadrant pulse current rectifier
3-phase current inverter with capacitor battery

8. Converters with current type of the DC link
Indirect frequency converter with 6-pulse thyristor rectifier and current inverter
Indirect frequency converter with 4-quadrant pulse current rectifier and current inverter

9. Converters with current type of the DC link
Switching frequency 0.5kHz
Switching frequency 5kHz

10. Thank You for your attention