Texas Instruments C2000

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Tuning the Step Response

Peak overshoot

Time to settle to within specified error band

 Performance of the control loop can be determined from the

output response to a change in load

 Acceptable response might be specified in terms of...

 We will adjust PID coefficients to optimise our digital controller

Main Page

Introduction to Digital Power Supply Design2
What Is Digital Power?3
Generic Power System Block Diagram3
Why Digital Control Techniques?4
Analog Controller4
Digital Controller4
Benefits of Digital Control5
Analog Control System6
Difference Equation7
Time Sampled Systems8
Processor Bandwidth9
Time Division Multiplexing (TDM)10
Digitally Controlled Power Supply11
System Mapping12
Tms320F280X13
Efficient 32-Bit Processor Capability14
DSP Core14
Epwm “DAC” Capability15
Control Peripherals15
PWM Effective Resolution15
12-Bit ADC Capability16
Code Composer Studio17
Project Manager17
Software Library Approach18
Modular Software Architecture19
“Signal Net” Based Module Connectivity19
Peripheral Drivers20
Dual Buck Example21
Software Block Execution22
Lab1: Exploring the Development Environment23
Simple Open-Loop Diagram24
Scaleable PWM Peripherals25
Epwm Module Block Diagram26
Module Sync and Phase Control27
Action Qualifier Module (AQM)28
Key Features28
Simple Waveform Construction29
Fault Management Support30
Trip Zones30
Multi-Phase Interleaved (MPI)31
Switching Requirements – MPI32
INIT-Time32
RUN-Time32
Half H-Bridge (HHB)33
Switching Requirements – HHB34
Phase Shifted Full Bridge (PSFB)35
Switching Requirements – PSFB36
Software Driver Module – ZVSFB37
Software Driver Module – PFC2PHIL38
Lab2: PWM Generation / Open-Loop Control39
Workshop Outline40
Controlling the Power Stage with Feedback41
The “Closed-Loop”42
ADC Module Block Diagram43
Digital Control of Power Converter44
High Frequency PWM46
High Resolution PWM (HRPWM)47
PWM Period47
Resolution Loss – Low Duty Utilization48
Benefit of High Resolution PWM49
Hires PWM (150Ps)49
Regular PWM (10Ns)49
Managing the “Closed-Loop”50
Simple User Interface Control51
Soft-Start and Sequencing Multi V52
Example: Closed-Loop Control53
Tuning the Loop for Good Transient Response55
The Digital Control System56
Advantages56
Considerations56
PID Control Review57
Tuning the Step Response58
Loop Tuning – Good First Step59
PID – Intuitive / Interactive60
Control Law Computation61
Type II Controller62
Digital Type II Controller63
Type III Controller64
Digital Type III Controller65
2-Channel Buck EVM66
2-Channel Buck EVM Schematic67
Lab4: Tuning the Loop68
Multi-Loop Control69
PFC (2PHIL) Software Control Flow70
DC-DC (ZVSFB) Software Control Flow71
CPU Bandwidth Utilization72
Summary and Conclusion74
Workshop Topics and Exercises Review75
C2000 Family Roadmap78
Tms320F280Xx79
Memory Sub-System79
Communications Ports79
The First Floating-Point Dscs80
Processor Performance80
Memory80
C2000 Digital Power Tools81
Vissim Graphical Programming82
Ucd9Xxx Digital Power Controller Family83
One-Day Training Course84
Multi-Day Training Course85
Internet86
USA - Product Information Center ( PIC )86
European Product Information Center (EPIC)87

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