Industrial electronics
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3 Inverter Mistakes That Cost Marks
3 mistakes that cost marks in inverter questions
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Lesson notes
Key points
- Inverter means rectifier: Students reverse them; a rectifier converts AC to DC, an inverter converts DC to AC.
- Square wave is pure AC: A square-wave output carries strong odd harmonics; use PWM and filtering to approach a sine wave.
- Firing both leg switches: Turning on both switches in one leg shorts the DC supply; always add dead time between them.
Takeaway: An inverter makes AC from DC; protect each leg with dead time.
Quick check: What prevents shoot-through in an inverter leg?
- Removing the DC filter
- Dead time between switches
- Firing both switches together
Dead time ensures one switch is fully off before the other turns on.
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