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Sketch the general form of the spectrum of a typical PWM wave and explain the principle behind using the PWM method to achieve variable voltage
- Sketch the general form of the spectrum of a typical PWM wave and explain the principle behind using the PWM method to achieve variable voltage and frequency generation using inverter circuits. Show how 3-level PWM signals for driving a single-phase inverter may be generated using the natural sampling technique. Explain why, despite its simple concept, the natural sampling is not generally used in a digital implementation. Make assumptions where necessary.
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