Page 58 – Advanced DC-DC Converters (Buck-Boost, Ćuk, SEPIC)
Subject: Power Electronics
Level: GATE / PSU Advanced
🔹 1️⃣ Inverting Buck-Boost Converter
Output voltage is inverted and can be higher or lower than input.
Voltage Gain (CCM):
Vo / Vin = − D / (1 − D)
- D → Duty cycle
- Output polarity → Negative
Key Points:
- Simple structure
- Single inductor
- Higher ripple compared to Cuk
🔹 2️⃣ Ćuk Converter
Uses capacitor for energy transfer and two inductors for smooth current.
Voltage Gain (CCM):
Vo / Vin = − D / (1 − D)
Special Feature:
- Continuous input current
- Continuous output current
- Low ripple
Applications:
- Precision power supplies
- Low ripple DC systems
🔹 3️⃣ SEPIC Converter
Single-Ended Primary Inductor Converter Non-inverting output, can step up or step down.
Voltage Gain (CCM):
Vo / Vin = D / (1 − D)
Features:
- Non-inverting output
- Two inductors
- Used in battery systems
🔹 4️⃣ Comparison Table
| Converter | Polarity | Voltage Gain | Ripple |
|---|---|---|---|
| Buck-Boost | Inverting | −D/(1−D) | Medium |
| Ćuk | Inverting | −D/(1−D) | Low |
| SEPIC | Non-Inverting | D/(1−D) | Low |
Exam Memory Capsule
✔ Buck-Boost → Simple, inverting ✔ Ćuk → Smooth current, low ripple ✔ SEPIC → Non-inverting ✔ Gain depends only on Duty Cycle ✔ CCM analysis important for GATE
Advanced DC-DC Converter Series – Shaktimatha Learning
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