PULSE-WIDTH-MODULATED OUTPUT

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Presentation transcript:

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 Ch8_6

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 Ch8_6

Bipolar Switching Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Bipolar Switching Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6

Islamic University of Gaza Faculty of Engineering Electrical Engineering Department Introduction to Power Electronics Dr.Moayed Almobaied Ch8_6