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 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 · Augment the same model by a dependent voltage-source and a dependent current source in the discontinuous-conduction 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 single-switch converters (buck, boost and buck-boost) in switch-mode dc power supplies using the average model. · 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-phaseac-motor drives by pulse-width-modulation (PWM). · 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 representations. · 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 loop. · A numerical example of design in a 1-kW PFC to meet a 3% THD limit. · PSpice-based 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 proportional-integral (PI) controllers used in motor drives. · A numerical example of designing a cascaded controller. · PSpice-based simulations to control position. · Effects of limiters and integrator windup (and how to avoid it). Click here for the MNPERE Order Form. |