POWER ELECTRONICS CIRCUITS DEVICES AND APPLICATIONS Eng Mohammed

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POWER ELECTRONICS CIRCUITS, DEVICES, AND APPLICATIONS Eng. Mohammed Alsumady

POWER ELECTRONICS CIRCUITS, DEVICES, AND APPLICATIONS Eng. Mohammed Alsumady

EPE 352 POWER ELECTRONICS DC-DC CONVERTERS 3/2/2021 2

EPE 352 POWER ELECTRONICS DC-DC CONVERTERS 3/2/2021 2

Step Down Converter • Constant frequency operation • Variable frequency operation 3/2/2021 3

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

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 5

Step Down Operation with RL Load 3/2/2021 6

Step Down Operation with RL Load 3/2/2021 6

Modes of Operation 3/2/2021 7

Modes of Operation 3/2/2021 7

Modes of Operation 3/2/2021 8

Modes of Operation 3/2/2021 8

Discontinuous Operation • For a continuous load current 3/2/2021 9

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 • The average output voltage 3/2/2021 10

Step-Up Operation • For controllable power 3/2/2021 11

Step-Up Operation • For controllable power 3/2/2021 11

Step-Up Operation 3/2/2021 12

Step-Up Operation 3/2/2021 12

Converter Classifications • 1 st Quadrant converter • 2 nd Quadrant converter • 1

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

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

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

2 nd Quadrant Converter 3/2/2021 16

1 st and 2 nd Quadrant Converter • S 1 and D 4 •

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 •

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

Four Quadrant Converter 3/2/2021 19

Switching Mode Regulators 3/2/2021 • Buck Regulator • Boost Regulator • Buck-Boost Regulator •

Switching Mode Regulators 3/2/2021 • Buck Regulator • Boost Regulator • Buck-Boost Regulator • Cuk Regulator 20

Buck Regulator 3/2/2021 21

Buck Regulator 3/2/2021 21

Buck Regulator • The critical values for a continuous inductor current and capacitor voltage

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 3/2/2021 23

Boost Regulator • The critical values for a continuous inductor current and capacitor voltage

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 3/2/2021 25

Buck-Boost Regulator • The critical values for a continuous inductor current and capacitor voltage

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 27

Cuk Regulator 3/2/2021 28

Cuk Regulator 3/2/2021 28

Cuk Regulator • The critical values for a continuous inductor current and capacitor voltage

Cuk Regulator • The critical values for a continuous inductor current and capacitor voltage 3/2/2021 29

Rectified Fed Converter 3/2/2021 30

Rectified Fed Converter 3/2/2021 30

Input Filter 3/2/2021 31

Input Filter 3/2/2021 31

Summary • A dc-dc can convert a fixed dc voltage to a variable dc

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