Power Semiconductor Systems I

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Power Semiconductor Systems I

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Presentation transcript:

Power Semiconductor Systems I Author: Ales Havel E-mail: ales.havel@vsb.cz Phone: 5937 Office: EA333 Web: http://homen.vsb.cz/~hav278/ Power Semiconductor Systems I

Presentation contents Main types of converters AC-DC converters DC-DC converters 1-quadrant choppers Buck converter Boost converter Buck-Boost converter Resistance converters 2-quadrant choppers 4-quadrant choppers DC-AC converters AC-AC converters

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

1-Quadrant DC/DC converters Buck converter (step down) Load voltage for continuous load current case: Load voltage for discontinuous load current case: Discontinuous load current Load current (transistor time) Continuous load current Load current (diode time)

1-Quadrant DC/DC converters Example 1: The Buck converter is working with the R + L + Ui type of the load. The duty cycle of the converter (z) is 15% and the switching frequency (f) is 200Hz. Evaluate the UAV load voltage for these cases: (U = 100V, Ui = 20V) Continuous load current Bypass diode conducting time is T/3. Solution: 1) 2)

1-Quadrant DC/DC converters Boost converter (step up) Load voltage for continuous load current case: Load voltage for discontinuous load current case: Discontinuous load current Max. load current (transistor time) Continuous load current Min. load current (diode time)

1-Quadrant DC/DC converters Example 1: The Boost converter is working with the R + L + Ui type of the load. The transistor conducting time T1 = 1ms, the bypass diode conducting time is 1ms. The switching frequency (f) is 400Hz. Evaluate the UAV load voltage, if U = 100V and Ui = 30V. Solution:

1-Quadrant DC/DC converters Resistance converter without capacitor Resistance converter with capacitor Regulation range of equivalent resistance: Regulation range of equivalent resistance:

2-Quadrant DC/DC converters 2-Quadrant DC/DC converter with current reversion:

2-Quadrant DC/DC converters 2-Quadrant DC/DC converter with voltage reversion:

4-Quadrant DC/DC converters 2 ways of control: Bipolar

4-Quadrant DC/DC converters 2 ways of control: Unipolar

Thank You for your attention