Page 29 – Comparison of Buck, Boost & Buck-Boost Converters
Subject: Power Electronics
Topic: DC-DC Converter Comparison
Level: GATE / PSU Preparation
1️⃣ Basic Function
| Converter | Function | Output Relation |
|---|---|---|
| Buck | Step Down | Vo = D Vs |
| Boost | Step Up | Vo = Vs / (1 − D) |
| Buck-Boost | Step Up / Down | Vo = − (D / (1 − D)) Vs |
2️⃣ Output Polarity
| Converter | Polarity |
|---|---|
| Buck | Same as input |
| Boost | Same as input |
| Buck-Boost | Reversed |
3️⃣ Voltage Gain Comparison
Buck → Gain = D
Boost → Gain = 1 / (1 − D)
Buck-Boost → Gain = − D / (1 − D)
4️⃣ Inductor Behavior
- All three use inductor energy storage
- Volt-second balance principle applies
- Ripple current similar expression
5️⃣ GATE Important Observations
- Buck is most efficient for step-down
- Boost gives high voltage at high duty cycle
- Buck-Boost introduces polarity inversion
- Duty cycle control is key in all three
Final Quick Revision Table
✔ Buck → Simple, stable, low ripple
✔ Boost → Used in renewable & SMPS
✔ Buck-Boost → Flexible but polarity reversed
Prepared for GATE & PSU – Shaktimatha Learning
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