The purpose of this master thesis project has been to study, operate and program the 32-bit 150MIPS TMS320F2812 DSP developed by Texas Instruments Inc. In addition, it has also been a goal to implement fast estimation techniques for control of resonant converters. For this purpose, PWM signals that are generated using this DSP are used. The demands on the system and the hardware to solve the problem were already decided when I started the work. The algorithms were programmed in C/C++ language, compiled, debugged and transferred to the DSP development board in a compiling and simulation tool (downloader), called CCS (Code Composer Studio v2), also provided by Texas Instruments. In the first chapters of this thesis I give general information about control systems, digital signal processors, digital signal processing and the DSP used in this work. The following chapters tell about PWM, how to configure the PWM outputs and some examples related with PWM signals are given. After a short review of series resonant converters, I presented the last example implemented in this project. I conclude with a summary and provide some hints of future work.
Table of Contents
1. Introduction
1.1 Power Electronic and Electrical Drive Systems
1.1.1 Power Electronic Applications
1.1.2 Switched Mode Operation
1.1.3 Electrical Drive Applications
1.1.3.1 Motion Control
1.2 Control Systems
1.2.1 Digital versus Analog Implementation
1.2.1.1 Review of Today’s Servo Drive Systems
1.2.2 Digital PWM Control Using DSP
1.3 Digital Signal Processors
1.3.1 Data Path of a DSP
1.3.2 Peripherals of a DSP
1.4 Digital Signal Processing
1.4.1 The History of DSP
2. The TMS320F2812 DSP
2.1 Overview
2.2 The Peripherals of F2812
3. The eZdsp F2812 Board
3.1 Overview
3.2 eZdsp F2812 Connectors
4. DSP Software Development
4.1 Basic Software Tools Required
4.2 Code Composer Studio
4.2.1 Creating a New Project
4.2.2 Adding Files to a Project
4.2.3 Building and Running the Program
4.2.4 Introduction to Breakpoints
4.2.5 Watch Window
4.2.6 Probe Points
4.2.7 Displaying Graphs
5. PWM
5.1 Definition
5.2 Event Manager PWM Waveform Generation
5.3 Generation of PWM Outputs
5.3.1 Asymmetric and Symmetric PWM Generation
5.3.2 Program Example
5.3.3 Dead-Time Generation on the TMS320C2812
5.3.3.1 Configuring PWM Outputs with Dead Band
5.4 Creating a PWM Signal with Fixed Duty Cycle and Frequency
5.5 Creating a PWM Signal with Variable Duty Cycle and Frequency
6. Applications
6.1 Creating a Sine Modulated PWM Signal
6.1.1 Sine Modulated PWM Generation to Control Inverters
6.2 Control of a Half-Bridge of a Switched Mode Power Supply
6.3 Control of a Series Resonant DC-DC Converter
6.3.1 The Series Resonant DC-DC Converter
6.3.1.1 SRC Operation Principle
6.3.2 The Snubber Effect
7. Conclusion and Recommended Continuation
7.1 Conclusion
7.2 Future Work
Objectives and Topics
This master's thesis aims to investigate, operate, and program the 32-bit TMS320F2812 DSP from Texas Instruments to implement advanced control techniques for power electronic converters, specifically focusing on the generation of PWM signals and fast estimation algorithms for resonant converters.
- Operation and programming of the TMS320F2812 DSP.
- Implementation of pulse width modulation (PWM) strategies.
- Digital control of power supplies and electrical drives.
- Application of fast estimation techniques for series resonant DC-DC converters.
- Utilization of Code Composer Studio (CCS) for software development and debugging.
Excerpt from the Book
6.3.1 The Series Resonant DC-DC Converter
Due to higher efficiency, lower electromagnetic interference and utilization of parasitic inductance and capacitance of power stage components, Resonant Converter topologies are popular in research and industrial and commercial applications.
6.3.1.1 SRC Operation Principle
Figure 6.11 shows the schematics of the power circuit of the Series Resonant DC-DC Converter. The circuit operation consists in closing the pairs of switches Q1, Q2 and Q3, Q4 alternatively at a frequency above the resonant frequency of the resonant circuit composed by Lr and Cr.
Summary of Chapters
1. Introduction: Provides an overview of power electronics, electrical drives, control systems, and the fundamentals of Digital Signal Processors and Digital Signal Processing.
2. The TMS320F2812 DSP: Describes the features, architecture, and peripheral modules of the TMS320F2812 DSP device.
3. The eZdsp F2812 Board: Details the hardware components, connectors, and configuration of the eZdsp F2812 development board.
4. DSP Software Development: Outlines the necessary tools, project creation process, and debugging features within Code Composer Studio.
5. PWM: Explains PWM theory, event manager waveform generation, dead-time configuration, and provides code examples for fixed and variable frequency/duty cycle signals.
6. Applications: Presents practical implementations including sine modulated PWM, half-bridge converter control, and series resonant DC-DC converter control.
7. Conclusion and Recommended Continuation: Summarizes the thesis findings and suggests directions for future work in PWM and resonant converter control.
Keywords
Digital Signal Processor, TMS320F2812, Pulse Width Modulation, PWM, Power Electronics, Series Resonant Converter, SRC, Code Composer Studio, Embedded Systems, Motion Control, Digital Control, Signal Processing, Dead-time Generation, Inverter Control, Real-time Simulation.
Frequently Asked Questions
What is the primary focus of this master's thesis?
The thesis focuses on the programming and application of the Texas Instruments TMS320F2812 DSP to control power electronic converters, specifically targeting efficient PWM signal generation and control techniques.
What are the key themes addressed in the work?
The core themes include digital control systems, DSP architecture, software development environments for DSPs, PWM modulation strategies, and the implementation of resonant converter control.
What is the main objective or research goal?
The primary goal is to study and operate the TMS320F2812 DSP to implement fast estimation techniques for the control of resonant converters, enabling the converter frequency to track the resonant frequency efficiently.
Which scientific methods are employed?
The work utilizes experimental verification using the eZdsp F2812 development board, C/C++ programming for algorithm implementation, and debugging/visualization via Code Composer Studio tools.
What topics are covered in the main section of the thesis?
The main section covers DSP hardware and software development, detailed PWM configuration, and the design of control algorithms for specific applications like series resonant DC-DC converters and inverters.
Which keywords best describe this research?
Key terms include TMS320F2812, Pulse Width Modulation (PWM), Digital Signal Processing (DSP), Series Resonant Converter (SRC), and Code Composer Studio.
How is the "dead-band" implemented for power converters?
The dead-band is implemented using the programmable dead-band generator within the TMS320F2812 Event Manager, which inserts a required delay between the turn-off and turn-on of complementary power switches to prevent shoot-through faults.
How does the author estimate the resonant frequency of the converter?
The author uses a fast estimation algorithm that samples the converter current at specific time instants within a conduction period to calculate the resonant frequency based on the measured current values.
- Quote paper
- Baris Bagci (Author), 2003, Programming and use of TMS320F2812 DSP to control and regulate power electronic converters, Munich, GRIN Verlag, https://www.grin.com/document/24105
