Page 38 – Single Phase Voltage Source Inverter (VSI)
Subject: Power Electronics
Topic: Single Phase VSI (Full Bridge)
Level: GATE / PSU Core
🔹 What is an Inverter?
An inverter converts DC power into AC power.
Applications:- UPS systems
- Solar inverters
- Motor drives
- HVDC systems
🔹 Single Phase Full Bridge VSI
- Uses 4 switches (IGBT/MOSFET)
- DC input voltage = Vdc
- Output = Square AC waveform
🔹 Output Voltage
Vo = +Vdc (for 0 to π)
Vo = −Vdc (for Ï€ to 2Ï€)
🔹 RMS Output Voltage
Vrms = Vdc
(for square wave inverter)🔹 Fourier Series (Important for GATE)
Vo(t) = (4Vdc/π) [ sin ωt + 1/3 sin 3ωt + 1/5 sin 5ωt + ... ]
Only odd harmonics present.🔹 Numerical Example
Given: Vdc = 200 V
Fundamental peak voltage:
V1peak = 4Vdc/Ï€
= 4 × 200 / 3.14
= 254.8 V
🔹 GATE Important Points
- Only odd harmonics exist
- THD is high for square wave
- Filters required
- RMS = Vdc
Quick Revision
Square Wave Inverter → Odd Harmonics
Fundamental = 4Vdc/Ï€
Inverter Series – Shaktimatha Learning
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