Table of Contents
This video consists of five parts (with review
questions after each part):
Part 1:
Introduction and Analysis of the Basic Building Block

Identify the generic buildingblock in
commonlyused, switchmode power electronic converters.

Derive its average model in the
continuousconduction, as a function of the dutyratio d.

Augment the same model by a dependent
voltagesource and a dependent current source in the
discontinuousconduction mode.

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
by PWM

Simulation of singleswitch converters (buck,
boost and buckboost) in switchmode dc power supplies using the average
model.

Application of the building block for
synthesis of dc and ac in switchmode converters of dcmotor drives,
single and threephase UPS, and threephase
acmotor drives by
pulsewidthmodulation (PWM).

Computer simulations confirm the accuracy of
the averagemodel based representations in modeling large
disturbances, which result in transition from continuous to discontinuous
conduction, or vice versa.
Part 3: Feedback Controller
Design in SwitchMode 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 discontinuousconduction
modes. Use of PSpice to produce the needed Bode plots of the
transfer function with accuracy to high frequencies.

A clear explanation of Type1, Type2, and
Type3 controllers, commonly used in switchmode dc power supplies.

A numerical example to design a voltagemode
controller for a Flyback converter operating in the continuousconduction
mode. Comparison of simulations using the switching and the average
representations.

A numerical example to design
peakcurrentmode controller for a Flyback converter operating in the
continuousconduction 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 PowerFactorCorrection (PFC) Circuits

Discussion of the basic requirements.

An easytounderstand explanation of designing
the inner averagecurrent control loop.

Considerations in designing the outer voltage
loop.

A numerical example of design in a 1kW PFC to
meet a 3% THD limit.

PSpicebased modeling under large
disturbances.
Part
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 proportionalintegral (PI)
controllers used in motor drives.

A numerical example of designing a cascaded
controller.

PSpicebased simulations to control position.

Effects of limiters and integrator windup (and
how to avoid it).
