Course10810518060 lectures
Control and Tuning Methods in Switched Mode Power Converters
Prof. Santanu Kapat · IIT Kharagpur
About
Switch mode power converters (SMPCs) play the central role in energy-efficient power conversion in emerging applications, such as electric vehicles, data centers, renewable energy, industrial automation, etc. In this context, selection of suitable control and modulation techniques of SMPCs is very important to meet challenging requirements in terms of transient performance, efficiency, line and load regulation, disturbance rejection, etc. While majority of commercial controller implementations are based on pulse width modulation and small-signal analysis, increasing switching frequencies, linking in part to wide bandgap devices, provide the opportunity to increase operating bandwidth and enhance performance. This course (i) presents an overview of conventional modulation and control methods, (ii) identifies small-signal performance limits, (iii) discusses large-signal based control approaches and (iv) compares strategies for controller tuning. Comparison among tuning methods illustrate how large-signal based control tuning methods can significantly improve performance and efficiency of SMPCs followed by the need for digital and mixed-signal control implementation for future power electronics converters.
Intended audience: M.Tech, Ph.D. as well as final year B.Tech students from AICTE approved institutes, design engineers from power management and power electronics industries, such as TI, STMicroelectronics, INTEL, Qualcomm, GE, NXP, Mahindra Electric, HCL, TCS, etc.
Prerequisites: Qualification (i) BE/B.Tech in Electrical/Electronics Engg. (degree completed or final year UG students) or (ii) PG M.Tech in Power Electronics or Power Systems or Control Systems (degree enrolled or completed) or (iii) one year or more experience in power electronics or power management converters.
Lectures
Week 1
- Lecture 1 : DC Power Conversion Systems – Introduction
- Lecture 2 : Overview of voltage regulators
- Lecture 3 : Switched mode power converter (SMPC)
- Lecture 4 : Model Development for MATLAB Simulation
- Lecture 5 : Demonstration of MATLAB Simulation
- Lecture 6 : Demonstration of MATLAB Simulation (Continued)
Week 2
- Lecture 7 : Power Stage Design of Basic SMPCs: Summary
- Lecture 8 : Fixed Frequency Modulation Techniques
- Lecture 9 : Variable Frequency Modulation Techniques
- Lecture 10 : Modulation in Discontinuous Conduction Mode (DCM)
- Lecture 11 : Synchronizing Simulation and Script files in MATLAB
- Lecture 12 : Interactive MATLAB Simulation and Case Studies
Week 3
- Lecture 13 : Converter’s Objectives and Control Implications
- Lecture 14 : Feedforward Control in SMPC
- Lecture 15 : Single and Multi Loop Feedback Control Methods
- Lecture 16 : Feedback Control of Cascaded SMPCs
- Lecture 17 : Combined feedback and feedforward control
- Lecture 18 : State feedback control
Week 4
- Lecture 19 : Variable Frequency Control – Understanding Opportunities and Challenges
- Lecture 20 : Constant On-time Control Methods
- Lecture 21 : Constant Off-time Control Methods
- Lecture 22 : Hysteresis Control Methods in SMPCs
- Lecture 23 : Stability and Performance Comparison using MATLAB Simulation
- Lecture 24 : Light Load Control Methods and Interactive MATLAB Simulation
Week 5
- Lecture 25 : Overview of Modeling Techniques
- Lecture 26 : State space averaging and model validation
- Lecture 27 : Circuit Averaging Techniques and Equivalent Circuit
- Lecture 28 : DC Analysis using Equivalent Circuit Model
Week 6
- Lecture 29 : Derivation of Small-Signal Transfer Functions
- Lecture 30 : Small-Signal Model Validation using MATLAB and Time Domain Correlation
- Lecture 31 : Small-signal Modeling with Closed Current Loop
- Lecture 32 : Impedance Analysis and Stability
Week 7
- Lecture 33 : Loop Gain Analysis and Understanding Model Limits using MATLAB
- Lecture 34 : PID Control Design and Tuning under VMC with MATLAB Case Studies
- Lecture 35 : Shaping Output Impedance of a Buck Converter under VMC
- Lecture 36 : Design of VMC Boost Converter and MATLAB Design Case Studies
Week 8
- Lecture 37 : Accurate Small-signal Modelling under CMC and Verification using MATLAB
- Lecture 38 : Design CMC in a Buck Converter and MATLAB based Model Validation
- Lecture 39 : Design of CMC Boost Converter – Output and State Feedback Approaches
- Lecture 40 : Loop Interactions in CMC and Design of Average CMC
Week 9
- Lecture 41 : Dynamics of SMPCs and Overview of Model-based Nonlinear Control
- Lecture 42 : Dynamics of LTIs and Vector Field with MATLAB Demonstration
- Lecture 43 : Geometric Perspectives of Eigenvalues and Eigenvectors in SMPCs
- Lecture 44 : Small-signal and Large-signal Model based Nonlinear Control
Week 10
- Lecture 45 : Introduction to Sliding Mode Control in SMPCs
- Lecture 46 : Sliding Mode Control Design in a Buck Converter
- Lecture 47 : Boundary Control Techniques and Selection of Switching Surfaces
- Lecture 48 : Time Optimal Control and Identifying Physical Limits in SMPCs
Week 11
- Lecture 49 : Linking Switching Boundary and PID Controller Structure in SMPCs
- Lecture 50 : Large-Signal Controller Tuning in Buck Converter: Objectives and Derivations
- Lecture 51 : Large-Signal Controller Tuning in Boost and Buck-Boost Converters
- Lecture 52 : Large-Signal Controller Tuning in Fixed- and Variable-Frequency Control
- Lecture 53 : Critical Performance Limits in Dynamic Voltage Scaling and Possible Solutions
Week 12
- Lecture 54 : Nonlinear Control vs. Large-Signal Tuning: Comparative Study using MATLAB
- Lecture 55 : Small-Signal vs. Large-Signal Tuning: Comparison using MATLAB Simulation
- Lecture 56 : Performance Improvement and Size Reduction using Large-Signal based Control
- Lecture 57 : Digital Control in High Frequency SMPCs – Introduction and Motivations
- Lecture 58 : Overview of Fixed and Variable Frequency Digital Control Architectures
- Lecture 59 : Challenges and Opportunities in Digitally Controlled High Frequency SMPCs
- Lecture 60 : Course Summary, Key Takeaways, Few Emerging Applications & Future Scopes
Syllabus and materials
At NPTEL, as the course publishes them.
Credits and licence
- Institution
- IIT Kharagpur
- Department
- Electrical Engineering
- Teacher
- Prof. Santanu Kapat
- Level
- Undergraduate
- Language
- English
- Subjects
- Engineering
- Source
- NPTEL
- Licence
- CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
- Attribution
- NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
- Who can watch
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