Industrial electronics
Guess first
Can You Make AC From a Battery?
Most students get this wrong: how does a battery run your AC fridge?
Quick check · tap an answer to continue
Lesson notes
Key points
- An inverter uses four switches in an H-bridge, flipping which pair conducts so current through the load reverses direction.
- Switching S1 with S4, then S2 with S3, makes a square wave, and PWM plus filtering shapes it into a near-sine.
Takeaway: Inverters reverse DC with switches to build AC.
Quick check: A battery gives DC. What turns it into 50 Hz AC for a fridge?
- A transformer alone
- A rectifier
- Switches reversing current
An inverter makes AC by switching DC polarity across the load.
H-bridge inverterSquare to sine
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