Inverters - DC to AC converters - Power electronics

It is about Inverters - DC to AC converters - Power electronics

1. INVERTERS

2. Half bridge inverter

3. FULL BRIDGE INVERTER

4. Mcmurray Bedford full bridge inverter

5. Three phase inverter

6. Types: 180 degree conduction mode 120 degree conduction mode

7. 180 degree conduction mode

8. 120 degree conduction mode

9. Pulse width modulated inverters Types Single pulse width modulation Multiple pulse width modulation Sinusoidal pulse width modulation Differs from output voltage and harmonic content.

10. Single pulse width modulation

11. Multiple pulse width modulation Output pulse is high Vr > Vc Output pulse is low, Vr < Vc Carrier frequency(fc) – determines number of pulse per cycle Modulation index, m = Vr / Vc m- controls output voltage Symmetrical pulse width modulation (or) Uniform pulse width modulation

12. Sinusoidal pulse width modulation (SPWM) Output pulse is high Vr > Vc Output pulse is low, Vr < Vc Carrier frequency(fc) – determines number of pulse per cycle Modulation index, m = Vr / Vc m- controls output voltage

13. Uninterrupted power supply (UPS) Standby Power supplies – UPS Providing power supplies to Computer, PLC Types: OFF line UPS ON line UPS

14. OFF line UPS - Short break ups

15. ON line UPS - No break ups