Power Electronics

Power Electronics for GATE Electrical Engineering, one topic per lesson: the theory in plain words, the formulas, a solved example, and GATE-style questions (MCQ, MSQ and NAT) whose numerical answers are recomputed by a program when the site is built.

Start the first lesson

1Devices

Power Semiconductor DevicesPower diodes, SCR characteristics, turn-on and turn-off methods, latching and holding current, di/dt and dv/dt protection, snubbers, GTO, power BJT, MOSFET and IGBT comparison.

2AC to DC

Phase-Controlled RectifiersSingle-phase half-wave and full-wave controlled rectifiers with R and RL loads, freewheeling diode, semi and full converters, three-phase converters, inversion mode, and overlap.

3DC to DC

DC-DC Converters (Choppers)Step-down (buck), step-up (boost) and buck-boost converters, duty ratio, continuous conduction, inductor ripple current, capacitor ripple voltage, chopper quadrants and control strategies.

4DC to AC

Inverters, PWM and AC Voltage ControllersSingle-phase half and full-bridge inverters, square-wave Fourier analysis, three-phase 180° and 120° conduction, sinusoidal PWM and modulation index, harmonics, and AC voltage controllers and cycloconverters.