Week 02
Converters and H-Bridges
I use my PSIM report and PI calculation file to revisit the DC-motor model, cascaded current-speed loops, and field weakening.
What I connect in this unit
Combining two H-bridge legs allows independent signs of motor terminal voltage and current, enabling four-quadrant drive. PWM duty sets average voltage, inductive current follows a freewheeling path when switches turn off, and deceleration energy can regenerate into the DC link.
Concept map
- Four-quadrant drive
- PWM duty
- Freewheeling paths
- DC-link voltage
Technical anchor
For ideal bipolar drive, average motor voltage can be written v_a,avg = (2D-1)V_dc; the signs of voltage and current distinguish motoring and regeneration quadrants.
How I review it
Draw switch and diode current paths for all four quadrants, then check same-leg dead time and the DC-link overvoltage path during regeneration.
Connection to the full course
Unit 2 of 12. Unit numbers follow the control structure in the saved design files and do not claim attendance weeks.