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A single phase IGBT bridge inverter, compared to a single pulse PWM control, multiple pulse PWM
- a)gives higher harmonic content in output voltage.
- b)gives higher maximum rms output voltage.
- c)requires more number of switching devices.
- d)gives lower harmonic content in the output voltage.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A single phase IGBT bridge inverter, compared to a single pulse PWM co...
In case of singte-putse width modulation (PWM), the width of the pulse is adjusted to reduce the harmonic. However, a single phase IGBT bridge inverter produces a square wave. This square wave contains 
harmonic, 
harmonic and
harmonic.
harmonic, harmonic andharmonic.Most Upvoted Answer
A single phase IGBT bridge inverter, compared to a single pulse PWM co...
Introduction:
The comparison is being made between a single phase IGBT bridge inverter and two types of PWM (Pulse Width Modulation) control methods: single pulse PWM and multiple pulse PWM. The analysis is focused on the harmonic content in the output voltage, the maximum RMS output voltage, and the number of required switching devices.
Harmonic Content in Output Voltage:
The correct answer is option 'A' - a single phase IGBT bridge inverter gives higher harmonic content in the output voltage compared to PWM control methods. Here's the explanation:
Single Pulse PWM:
- In single pulse PWM control, the output voltage waveform is achieved by switching the inverter devices (IGBTs) with a single pulse per half-cycle.
- The switching frequency is typically low, resulting in a limited number of harmonics in the output voltage waveform.
- The harmonic content is relatively low, making it suitable for applications where low harmonic distortion is desired.
Multiple Pulse PWM:
- In multiple pulse PWM control, the output voltage waveform is achieved by switching the inverter devices with multiple pulses per half-cycle.
- By modulating the pulse width and amplitude of the switching signals, the harmonic content can be significantly reduced.
- Multiple pulse PWM techniques, such as sinusoidal PWM or space vector PWM, are commonly used to achieve low harmonic distortion in the output voltage.
- These techniques distribute the harmonics more evenly across the frequency spectrum, resulting in a smoother output voltage waveform with reduced harmonic content.
Single Phase IGBT Bridge Inverter:
- A single phase IGBT bridge inverter operates based on a fixed switching pattern, typically without any PWM control.
- The switching frequency is fixed and relatively low compared to PWM control methods.
- The fixed switching pattern results in a higher harmonic content in the output voltage waveform.
- The harmonics generated by the inverter can cause distortion and interference in connected loads or power systems.
Conclusion:
In summary, a single phase IGBT bridge inverter without PWM control exhibits higher harmonic content in the output voltage compared to single pulse PWM and multiple pulse PWM control methods. PWM techniques allow for precise control of the switching signals, enabling the reduction of harmonics and achieving a smoother output voltage waveform.
The comparison is being made between a single phase IGBT bridge inverter and two types of PWM (Pulse Width Modulation) control methods: single pulse PWM and multiple pulse PWM. The analysis is focused on the harmonic content in the output voltage, the maximum RMS output voltage, and the number of required switching devices.
Harmonic Content in Output Voltage:
The correct answer is option 'A' - a single phase IGBT bridge inverter gives higher harmonic content in the output voltage compared to PWM control methods. Here's the explanation:
Single Pulse PWM:
- In single pulse PWM control, the output voltage waveform is achieved by switching the inverter devices (IGBTs) with a single pulse per half-cycle.
- The switching frequency is typically low, resulting in a limited number of harmonics in the output voltage waveform.
- The harmonic content is relatively low, making it suitable for applications where low harmonic distortion is desired.
Multiple Pulse PWM:
- In multiple pulse PWM control, the output voltage waveform is achieved by switching the inverter devices with multiple pulses per half-cycle.
- By modulating the pulse width and amplitude of the switching signals, the harmonic content can be significantly reduced.
- Multiple pulse PWM techniques, such as sinusoidal PWM or space vector PWM, are commonly used to achieve low harmonic distortion in the output voltage.
- These techniques distribute the harmonics more evenly across the frequency spectrum, resulting in a smoother output voltage waveform with reduced harmonic content.
Single Phase IGBT Bridge Inverter:
- A single phase IGBT bridge inverter operates based on a fixed switching pattern, typically without any PWM control.
- The switching frequency is fixed and relatively low compared to PWM control methods.
- The fixed switching pattern results in a higher harmonic content in the output voltage waveform.
- The harmonics generated by the inverter can cause distortion and interference in connected loads or power systems.
Conclusion:
In summary, a single phase IGBT bridge inverter without PWM control exhibits higher harmonic content in the output voltage compared to single pulse PWM and multiple pulse PWM control methods. PWM techniques allow for precise control of the switching signals, enabling the reduction of harmonics and achieving a smoother output voltage waveform.
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