POWER ELECTRONICSCIRCUITS, DEVICES, AND APPLICATIONSEng.Mohammed Alsumady

EEL 4242 by M .H. Rashid

**EPE 352POWER ELECTRONICS DC-DC CONVERTERS

EEL 4242 by M .H. Rashid

**Step Down Converter Constant frequency operationVariable frequency operation

EEL 4242 by M .H. Rashid

**PWM Waveform Generation which is also called the modulation voltage, M

EEL 4242 by M .H. Rashid

**Step Down Operation with RL Load

EEL 4242 by M .H. Rashid

**Step Down Operation with RL Load

EEL 4242 by M .H. Rashid

**Modes of Operation

EEL 4242 by M .H. Rashid

**Modes of Operation

EEL 4242 by M .H. Rashid

**Discontinuous Operation For a continuous load current

EEL 4242 by M .H. Rashid

**Step-Up Operation The average output voltage

EEL 4242 by M .H. Rashid

**Step-Up Operation For controllable power

EEL 4242 by M .H. Rashid

**Step-Up Operation

EEL 4242 by M .H. Rashid

**Converter Classifications 1st Quadrant converter 2nd Quadrant converter 1st and 2nd quadrant 3rd and 4th quadrant Four-quadrant

EEL 4242 by M .H. Rashid

**1st Quadrant Converter Both the voltage and the current are positive

EEL 4242 by M .H. Rashid

**2nd Quadrant Converter The voltage is positive and the current is negative

EEL 4242 by M .H. Rashid

**2nd Quadrant Converter

EEL 4242 by M .H. Rashid

**1st and 2nd Quadrant Converter S1 and D4 S4 and D1

EEL 4242 by M .H. Rashid

**3rd and 4th Quadrant Converter S3 and D2 S2 and D3

EEL 4242 by M .H. Rashid

**Four Quadrant Converter

EEL 4242 by M .H. Rashid

**Switching Mode Regulators Buck Regulator Boost Regulator Buck-Boost RegulatorCuk Regulator

EEL 4242 by M .H. Rashid

**Buck Regulator

EEL 4242 by M .H. Rashid

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

EEL 4242 by M .H. Rashid

**Boost Regulator

EEL 4242 by M .H. Rashid

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

EEL 4242 by M .H. Rashid

**Buck-Boost Regulator

EEL 4242 by M .H. Rashid

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

EEL 4242 by M .H. Rashid

**Cuk Regulator

EEL 4242 by M .H. Rashid

**Cuk Regulator

EEL 4242 by M .H. Rashid

**Cuk RegulatorThe critical values for a continuous inductor current and capacitor voltage

EEL 4242 by M .H. Rashid

**Rectified Fed Converter

EEL 4242 by M .H. Rashid

**Input Filter

EEL 4242 by M .H. Rashid

**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).

EEL 4242 by M .H. Rashid

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