GATE EE 2027 · SUBJECT 10 / 10

Power Electronics: Syllabus, Topics & Reference Books

Power devices, DC–DC converters, rectifiers, thyristor converters, harmonics, inverters and PWM.

Power Electronics syllabus topics

The following topic groups come from the syllabus content included in this study hub. Consult the official GATE 2027 website for examination updates.

  1. Static V-I characteristics and firing/gating circuits for Thyristor, MOSFET, IGBT;
  2. DC to DC conversion: Buck, Boost and Buck-Boost Converters;
  3. Single and three-phase configuration of uncontrolled rectifiers;
  4. Voltage and Current commutated Thyristor based converters;
  5. Bidirectional ac to dc voltage source converters;
  6. Magnitude and Phase of line current harmonics for uncontrolled and thyristor based converters;
  7. Power factor and Distortion Factor of AC to DC converters;
  8. Single-phase and three-phase voltage and current source inverters,
  9. sinusoidal pulse width modulation.

How to prepare this subject

  1. Check topic coverage. Work through the groups above and mark unfamiliar concepts.
  2. Learn and practise. Study one relevant reference book, then solve worked examples without looking at the solutions.
  3. Apply concepts. Use GATE EE previous-year questions to assess where you need additional practice.
  4. Revise and test. Create a short formula or concept sheet and reattempt questions you initially missed.

Recommended reference books

These are textbook suggestions for studying this subject, not a mandatory purchase list.

  • Power Electronics — P. S. Bimbhra
  • Power Electronics: Circuits, Devices, and Applications — M. H. Rashid

Free resources for practice

Use the downloadable question-paper collection and year-wise weightage report as supporting study materials.

GATE EE Study Hub is an independent educational initiative by Manoranjan Kumar. It is not affiliated with or endorsed by the GATE organizers.

STEP-BY-STEP LEARNING

Buck converter duty cycle and inductor ripple

Calculate output voltage, inductor current ripple and the continuous-conduction boundary.

Key learning goal: Use volt-second balance to link duty cycle to output voltage and test whether the inductor current remains continuous.

Read the detailed worked example and self-check question →

Quick concept check: Keeping the same 48 V input, 12 V output, fs and load, what is the critical inductance at which IL,min just reaches zero?

Check the answer

At the boundary, ΔiL = 2Io = 4 A. Lcrit = (Vin − Vo)Ton/4 = (36 × 12.5 μs)/4 ≈ 112.5 μH.

Common pitfalls: Using 2.25 A as the ripple amplitude instead of peak-to-peak ripple. Forgetting the factor D when calculating the on-time.