POWER ELECTRONICS CIRCUITS DEVICES AND APPLICATIONS Eng Mohammed
- Slides: 32
POWER ELECTRONICS CIRCUITS, DEVICES, AND APPLICATIONS Eng. Mohammed Alsumady
EPE 352 POWER ELECTRONICS DC-DC CONVERTERS 3/2/2021 2
Step Down Converter • Constant frequency operation • Variable frequency operation 3/2/2021 3
PWM Waveform Generation • which is also called the modulation voltage, M 3/2/2021 4
Step Down Operation with RL Load 3/2/2021 5
Step Down Operation with RL Load 3/2/2021 6
Modes of Operation 3/2/2021 7
Modes of Operation 3/2/2021 8
Discontinuous Operation • For a continuous load current 3/2/2021 9
Step-Up Operation • The average output voltage 3/2/2021 10
Step-Up Operation • For controllable power 3/2/2021 11
Step-Up Operation 3/2/2021 12
Converter Classifications • 1 st Quadrant converter • 2 nd Quadrant converter • 1 st and 2 nd quadrant • 3 rd and 4 th quadrant • Four-quadrant 3/2/2021 13
1 st Quadrant Converter • Both the voltage and the current are positive 3/2/2021 14
2 nd Quadrant Converter • The voltage is positive and the current is negative 3/2/2021 15
2 nd Quadrant Converter 3/2/2021 16
1 st and 2 nd Quadrant Converter • S 1 and D 4 • S 4 and D 1 3/2/2021 17
3 rd and 4 th Quadrant Converter • S 3 and D 2 • S 2 and D 3 3/2/2021 18
Four Quadrant Converter 3/2/2021 19
Switching Mode Regulators 3/2/2021 • Buck Regulator • Boost Regulator • Buck-Boost Regulator • Cuk Regulator 20
Buck Regulator 3/2/2021 21
Buck Regulator • The critical values for a continuous inductor current and capacitor voltage 3/2/2021 22
Boost Regulator 3/2/2021 23
Boost Regulator • The critical values for a continuous inductor current and capacitor voltage 3/2/2021 24
Buck-Boost Regulator 3/2/2021 25
Buck-Boost Regulator • The critical values for a continuous inductor current and capacitor voltage 3/2/2021 26
Cuk Regulator 3/2/2021 27
Cuk Regulator 3/2/2021 28
Cuk Regulator • The critical values for a continuous inductor current and capacitor voltage 3/2/2021 29
Rectified Fed Converter 3/2/2021 30
Input Filter 3/2/2021 31
Summary • A dc-dc can convert a fixed dc voltage to a variable dc voltage. • A four-quadrant converter allows power flow to and from load. • Switching mode converter can produce output voltage higher and lower than the input voltage. • The rectifier fed boost converter is commonly used for unity power factor correction (UPFC). 3/2/2021 32
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