a) What are the pros and cons of a sine wave PWM inverter versus a plain square

Question

a) What are the pros and cons of a sine wave PWM inverter versus a plain square wave inverter? b) Sketch a block diagram of a Class D audio amplifier, and briefly explain how it is related to a PWM sine wave inverter and amplifies an input audio signal. c) Suppose we have a single tone audio signal of frequency, 10 KHz, and the carrier frequency is 300 KHz. Sketch the approximate power spectrum of the output waveform. d) Does the output need to be filtered to improve the quality of the amplified audio and if so, what kind of filter is needed? e) What are the pros and cons of a Class D amplifier compared to conventional audio amplifiers such as Class A and Class AB?

Explanation / Answer

According to chegg guidelines , I am answering the first question only.

Pros-

1-The PWM sine wave inverters are more accurate and provide clean output.

2- They are not noisy as the square wave inverters are very noisy. ie. HARMoNIC content is low in PWM inverter.

3- They can be adjusted to get any desired value using the duty cycle.

4- Input power factor is very good in PWM inverter in comparison to square wave inverter.

5- Sine wave is better than square waves for motor loads and hence PWM inverter is preferred over square wave inverter.

Cons-

1- PWM inverter are costlier than square wave inverter.

2- Electromagnetic interference occurs because the current rises and falls in PWM inverters.

3- The initial voltage is higher than the input voltage which needs to be fixed by varying duty cycle.

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