POWER ELECTRONICS – PAGE 19
Fully Controlled Bridge – Inverter Mode
1️⃣ When Does Inverter Mode Occur?
When α > 90°
- Average voltage becomes negative
- Power flows from DC to AC side
2️⃣ Condition for Inverter Operation
- Load must have DC source (like battery)
- SCR firing angle between 90° and 180°
3️⃣ Average Voltage
Vavg = (2Vm / π) cos α
Since cos α becomes negative → Vavg negative.
4️⃣ Power Flow Direction
- Rectifier Mode → AC to DC
- Inverter Mode → DC to AC
🎯 GATE Important
- Understand sign of cos α
- Power reversal concept
- Waveform identification
Very Important: Fully controlled bridge is reversible converter.
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