CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady

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Presentation transcript:

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

4/16/2017 EPE 352 POWER ELECTRONICS DC-DC CONVERTERS 4/16/2017 2 2

Step Down Converter Constant frequency operation Variable frequency operation 4/16/2017 3

PWM Waveform Generation which is also called the modulation voltage, M 4/16/2017 4

Step Down Operation with RL Load 4/16/2017 5

Step Down Operation with RL Load 4/16/2017 6

Modes of Operation 4/16/2017 7

Modes of Operation 4/16/2017 8

Discontinuous Operation For a continuous load current 4/16/2017 9

Step-Up Operation The average output voltage 4/16/2017 10

Step-Up Operation For controllable power 4/16/2017 11

Step-Up Operation 4/16/2017 12

Converter Classifications 1st Quadrant converter 2nd Quadrant converter 1st and 2nd quadrant 3rd and 4th quadrant Four-quadrant 4/16/2017 13

1st Quadrant Converter Both the voltage and the current are positive 4/16/2017 14

2nd Quadrant Converter The voltage is positive and the current is negative 4/16/2017 15

2nd Quadrant Converter 4/16/2017 16

1st and 2nd Quadrant Converter S1 and D4 S4 and D1 4/16/2017 17

3rd and 4th Quadrant Converter S3 and D2 S2 and D3 4/16/2017 18

Four Quadrant Converter 4/16/2017 19

Switching Mode Regulators Buck Regulator Boost Regulator Buck-Boost Regulator Cuk Regulator 4/16/2017 20

Buck Regulator 4/16/2017 21

Buck Regulator The critical values for a continuous inductor current and capacitor voltage 4/16/2017 22

Boost Regulator 4/16/2017 23

Boost Regulator The critical values for a continuous inductor current and capacitor voltage 4/16/2017 24

Buck-Boost Regulator 4/16/2017 25

Buck-Boost Regulator The critical values for a continuous inductor current and capacitor voltage 4/16/2017 26

Cuk Regulator 4/16/2017 27

Cuk Regulator 4/16/2017 28

Cuk Regulator The critical values for a continuous inductor current and capacitor voltage 4/16/2017 29

Rectified Fed Converter 4/16/2017 30

Input Filter 4/16/2017 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). 4/16/2017 32