Week 10
Three-Phase Inverters
I organize a study path from switching devices to converters and inverters while tracking power flow and device stress together.
What I connect in this unit
The three legs of a three-phase inverter create six active space vectors and two zero vectors. Six-step switching uses them in a fixed order, PWM adjusts vector dwell times, and line voltage is the difference between two phase pole voltages. Dead time prevents leg shoot-through but introduces voltage error.
Concept map
- Six-step switching
- Space vectors
- Line voltage
- Dead time
Technical anchor
Each line voltage follows a relation such as v_ab = v_aN - v_bN; in the space-vector plane, the reference is synthesized from dwell times of two adjacent active vectors and a zero vector.
How I review it
Check vector order and total dwell time over one switching period, ensure upper and lower devices never overlap, and inspect how dead-time voltage error changes with current direction.
Connection to the full course
Unit 10 of 12. Unit numbers follow circuit dependencies and do not claim the original lecture schedule.