Rapid Prototyping of FPGAbased Control Systems

1
Rapid Prototyping ofFPGA-based Control Systems  
VTB Conference 2004 September 14-15, 2004

• Antonello Monti
• Dept. of Electrical Engineering
• University of South Carolina
• Columbia, SC 29208

2
Summary

• A little bit of history
• Current trends
• USC experiments
• Teaching in Control

3
A little bit of History

• 80s application of Digital Technology to High
  Power Electrical Drives (mostly DC drives)
• 90s wide application of Digital Control in
  Electrical Drives and High Power Converter
• 2000s Towards full digital solution at every
  power level

4
Problems and Challenges

• Cost
• Computational Capability
• High power drive (1ms sampling time)
• Low power drive (down to 10 ms cycle)
• Power Supply (under 1 ms cycle)

5
Current Trends

• APEC 2004 opened this year with a talk by Steve
  Leeb (MIT) entitled
• Putting Profit into Power Electronic Products
  with Digital Control

6
Technology
10ms
General Purpose microprocessor
1ms
Microcontroller
10ms
DSP
100ns
FPGA
7
Concrete examples PoliMI
F. Castelli Dezza, M. Lazzaroni, A. Monti,
Current controlled Power Converters through In
System Programmable Devices, IEEE ICECS 97
8
Concrete examples PoliMI
F. Castelli Dezza, M. Lazzaroni, A. Monti,
Current controlled Power Converters through In
System Programmable Devices, IEEE ICECS 97
9
Concrete examples PoliMIAnsaldo
M. Matuonto, E. Gatti, G. Torri, A. Monti, F.
Tognato, Multilevel Pulse Width Modulation for
large power medium voltage VSI, PEMC 98
10
Concrete examplesPoliMIAnsaldo
M. Matuonto, E. Gatti, G. Torri, A. Monti, F.
Tognato, Multilevel Pulse Width Modulation for
large power medium voltage VSI, PEMC 98
11
Concrete examplesPoliMIAnsaldo
M. Matuonto, E. Gatti, G. Torri, A. Monti, F.
Tognato, Multilevel Pulse Width Modulation for
large power medium voltage VSI, PEMC 98
12
Concrete examplesPoliMIAnsaldo
M. Matuonto, E. Gatti, G. Torri, A. Monti, F.
Tognato, Multilevel Pulse Width Modulation for
large power medium voltage VSI, PEMC 98
13
Concrete examplesUniversity of Colorado
Digitally Controlled DC-DC Converter for RF
Power Amplifier Vahid Yousefzadeh, Narisi Wang,
Dragan Maksimovic, Zoya Popovic IEEE APEC04
14
Concrete examplesUniversity of Colorado

• voltage-mode PID controller
• two-comparator flash A/D converter
• a look-up table based compensator
• - a 9-bit constant-frequency (200 KHz) digital PWM

15
Concrete examples IR
http//www.irf.com/product-info/imotion/advantage.
html1A
16
Concrete examples IR
http//www.irf.com/product-info/imotion/advantage.
html1A
17
USC experience

• Digital control for GaN converter
• High Speed Interface for Real Time Simulation
• REM Lab capability
• Xilinx donation
• New teaching opportunity

18
AlGaN/GaN MOSHFET Power Converter

• Power Converter Schematic

S. Pytel, S. Lentijo, A. Koudymov, S. Rai, V.
Adivarahan, J. Yang, J. Hudgins, E. Santi, A.
Monti, AlGaN/GaN MOSHFET Integrated Circuit
Power Converter, IEEE PESC04
19
Control Issues

• The very high switching frequencies used in this
  system will pose new challenges for the power
  control elements. Higher bandwidth will be
  required for every component in the system,
  including, sensors, Control Algorithm and PWM
  unit.
• The sliding mode control was selected as control
  algorithm because it does not require a dedicated
  PWM unit, the output of the algorithm is directly
  the switching command, and theoretically it is
  not limited in bandwidth.

20
PHIL Interface Scheme

• NI PXI-8176 Pentium III Embedded Controller
• NI PXI-7831 FPGA module
• H-Bridge inverter
• (TI DRV592)
• Fast ADC AD9218 (10-bit and 105 MSPS)

21
Xilinx FPGA

• Xilinx is the leading company in FPGA technology.
• FPGA boards
• 1 Virtex II Pro development board.
• 10 Spartan 2E development boards.
• Software
• ISE (Xilinx Integrated Software Environment)
  programmable design tool.
• System Generator for DSP applications Matlab
  connectivity.

22
Design Path
Desing in Simulink
Download To FPGA
VTB-RT HIL test
Final test
23
Buck Converter Design
24
The HW Platform
25
HIL testing
26
An example of design
27
Preliminary HIL results
28
Experimental Results
29
Conclusions

• A brief history of digital control in power
  electronics
• An analysis of the new trends
• Review of some of the most recent and significant
  contributions by USC labs
• Application of VTB-based HIL for preliminary
  testing