A cosimulation approach to model-based design for complex power electronics and digital control systems

ABSTRACT

Simulation has played an important role in reducing design time and improving the reliability of power electronics systems. Over the years power electronics system diversity and complexity has grown to include subsystems which traditionally have used different modeling and simulation strategies, making the simulation of such systems difficult. This paper presents a standard simulation methodology for such complex power electronics systems based on cosimulation. This approach allows individual subsystems to be conveniently modeled in the most natural and trusted simulation environment. A simulation example of a four-phase buck converter employing digital control is provided. The power stage is modeled in Saber, and the digital controller is modeled in Saber, and the digital controller is modeled in Simulink using the Xilinx System Generator blockset. The Saber-Simulink cosimulation is used as the interface between the two engines. Xilinx System Generator is used to automatically generate synthesizable code for Xilinx FPGAs.

REFERENCES

• 1: Raul Camposano, "Panel: System Synthesis: Can We Meet the Challenges to Come?," Proceedings of the 33rd Design Automation Conference, June 1996, p. 770.
• 2: S. Watkins, K. Wong, "Mixed-Signal Modeling with Vanilla VHDL and Verilog," Blue Pacific Computing article at www.bluepc.com/mixpap.html.
• 3: Virtuoso AMS Designer Mixed Signal Simulator: www.cadence.com/products/custom_ic/ams_designer/index.aspx.
• 4: Mentor Graphics Advanced Mixed Signal Simulator: www.mentor.com/products/fv/ams/.
• 5: "N. Mohan, W. P. Robbins, T. M. Undeland, R. Nilssen, and O. Mo, "Simulation of power electronics and motion control systems---An overview," Proc. IEEE, Vol.82 Aug. 1994, pp. 1287--1302,.
• 6: D. Maksimovic, A. M. Stankovic, V. J. Thottuvelil, G. C. Verghese, "Modeling and simulation of power electronic converters," Proceedings of the IEEE, Vol.89, Iss.6, Jun 2001, pp. 898--912.
• 7: D. El-Ebiary; M. Fikry; M. Dessouky; H. Ghitani, "Average Behavioral Modeling Technique for Switched-Capacitor Voltage Converters," Proceedings of the 2006 IEEE International Behavioral Modeling and Simulation Workshop, Sept. 2006, pp. 109--114.
• 8: J. Moreland, "Choosing a simulation tool," IEE Colloquium on Power Electronic Systems Simulation, Nov 1998, pp. 8/1--8/10.
• 9: J. C. Clare, M. Sumner, D. Butt, B. Palethorpe, "Combined power electronic circuit and control loop simulation: why? And how?," IEE Colloquium on, Vol. Power Electronic Systems Simulation, Nov 1998, pp. 7/1--7/8.
• 10: The Designer's Guide to Verilog-AMS by Kenneth S. Kundert & Olaf Zinke, 2004.
• 11: Saber Mixed Signal Mixed Technology Simulation: www.synopsys.com/products/mixedsignal/saber.
• 12: Simulation and Model-Based Design: www.mathworks.com/products/simulink/.
• 13: P. Korondi, P. Bauer, "Integrated Control and Circuit Simulation for a Motion Control System," EPE 2003 Conference and exhibition, Toulouse France, 2003.
• 14: Yang E. X., Guo L., Lee F. C., "Describing function method in modeling of switching converters," Proceedings Virginia Power Electronics Center (VPEC) Seminar, 1993.

INDEX TERMS

Keywords:
Saber, Simulink, automatic code generation, cosimulation, digital control