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PWM Switching Technology and Modulation

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Questions and Answers

What is the typical range of Mf in a PWM switching scheme?

1000 to 10000
1 to 10
100 to 1000
10 to 100 (correct)

What is the purpose of combining the high frequency carrier signal with the low frequency control signal?

To decrease the switching frequency
To increase the switching power loss
To modulate the output voltage (correct)
To reduce the harmonic frequencies

What is the frequency of the triangular wave in a PWM converter?

Carrier frequency
Desired ac output frequency
Modulation frequency
Switching frequency for turning devices on and off (correct)

What is the effect of increasing the carrier frequency in a PWM switching scheme?

It increases the switching power loss (D) Signup and view all the answers

What is the typical frequency of the output power in a PWM converter?

60 or 50 Hz or even lower (D) Signup and view all the answers

What is the benefit of using a higher switching frequency in a PWM converter?

It decreases the L-C filter energy storage requirement (C) Signup and view all the answers

What is the function of the triangular carrier signal in a PWM switching scheme?

To generate the PWM pulses for switching devices on and off. Signup and view all the answers

How does the frequency of the triangular wave relate to the switching frequency in a PWM converter?

The frequency of the triangular wave is equal to the switching frequency for turning devices on and off. Signup and view all the answers

What is the purpose of the sinusoidal control voltage in a PWM converter?

To set the desired ac output frequency. Signup and view all the answers

What is the advantage of using a higher switching frequency in terms of filter design?

It results in lower L-C filter energy storage requirements. Signup and view all the answers

How does the modulation process work in a PWM switching scheme?

By combining a high frequency carrier signal with a low frequency control signal. Signup and view all the answers

What is the relationship between the switching frequency and power loss in a PWM switching scheme?

Increasing the switching frequency increases the switching power loss. Signup and view all the answers

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