Table of Contents
This video consists of five parts (with review
questions after each part):
Introduction and Analysis of the Basic Building Block
Identify the generic building-block in
commonly-used, switch-mode power electronic converters.
Derive its average model in the
continuous-conduction, as a function of the duty-ratio d.
Augment the same model by a dependent
voltage-source and a dependent current source in the
Use of PSpice to verify the validity of the
average dynamic models and the enhancement of simulation speeds.
Part 2: Synthesis of dc and ac
Simulation of single-switch converters (buck,
boost and buck-boost) in switch-mode dc power supplies using the average
Application of the building block for
synthesis of dc and ac in switch-mode converters of dc-motor drives,
single- and three-phase UPS, and three-phase
ac-motor drives by
Computer simulations confirm the accuracy of
the average-model based representations in modeling large
disturbances, which result in transition from continuous to discontinuous
conduction, or vice versa.
Part 3: Feedback Controller
Design in Switch-Mode dc Power Supplies
Review of basic control theory: crossover
frequency, phase margin, bandwidth, etc.
Linearizing the PWM controller and the
converter power stage in the continuous and the discontinuous-conduction
modes. Use of PSpice to produce the needed Bode plots of the
transfer function with accuracy to high frequencies.
A clear explanation of Type-1, Type-2, and
Type-3 controllers, commonly used in switch-mode dc power supplies.
A numerical example to design a voltage-mode
controller for a Flyback converter operating in the continuous-conduction
mode. Comparison of simulations using the switching and the average
A numerical example to design
peak-current-mode controller for a Flyback converter operating in the
continuous-conduction mode. Comparison of simulations using the
switching and the average representations under large disturbances to span
both the continuous and the discontinuous conduction modes.
Part 4: Feedback Controller
Design in Power-Factor-Correction (PFC) Circuits
Discussion of the basic requirements.
An easy-to-understand explanation of designing
the inner average-current control loop.
Considerations in designing the outer voltage
A numerical example of design in a 1-kW PFC to
meet a 3% THD limit.
PSpice-based modeling under large
5: Cascaded Feedback Controller Design in Motor Drives
Advantages of cascaded control with torque,
speed and position loops.
Linear representation of the PWM controller,
the inverter and the motor.
Explanation of the proportional-integral (PI)
controllers used in motor drives.
A numerical example of designing a cascaded
PSpice-based simulations to control position.
Effects of limiters and integrator windup (and
how to avoid it).