Equalizing Average Source Power with Pattern Swapping Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Equalizing Average Source Power with Pattern Swapping Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Problem? Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Problem? Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Equalizing Average Source Power with Pattern Swapping Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Equalizing Average Source Power with Pattern Swapping Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Diode-Clamped Multilevel Inverters Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Diode-Clamped Multilevel Inverters Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Ch8_5

PULSE-WIDTH-MODULATED OUTPUT Islamic University of Gaza Faculty of Engineering Electrical Engineering Department PULSE-WIDTH-MODULATED OUTPUT Pulse-width modulation (PWM) provides a way to decrease the total harmonic distortion of load current. A PWM inverter output, with some filtering, can generally meet THD requirements more easily than the square wave switching scheme. The unfiltered PWM output will have a relatively high THD, but the harmonics will be at much higher frequencies than for a square wave, making filtering easier. Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department In PWM, the amplitude of the output voltage can be controlled with the modulating waveforms. Reduced filter requirements to decrease harmonics and the control of the output voltage amplitude are two distinct advantages of PWM. Disadvantages include more complex control circuits for the switches and increased losses due to more frequent switching. Control of the switches for sinusoidal PWM output requires (1) a reference signal, sometimes called a modulating or control signal, which is a sinusoid in this case and (2) a carrier signal, which is a triangular wave that controls the switching frequency. Bipolar and unipolar switching schemes are discussed next. Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Bipolar Switching Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Bipolar Switching Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Lecture 25

Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

THREE-PHASE INVERTERS Islamic University of Gaza Faculty of Engineering Electrical Engineering Department THREE-PHASE INVERTERS The Six-Step Inverter This circuit produces a three-phase ac output from a dc input. A major application of this circuit is speed control of induction motors, where the output frequency is varied. Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics, Dr. Moayed Almobaied Lecture 25