1. Power Electronics CAD: from space applications to industrial applications P.G. Maranesi, M. Riva Electronic Section – Department of Physics University of Milan Via Celoria 16, 20133 Milano Italy Congresso del Dipartimento di Fisica Highlights in Physics 2005

2. Power Electronics CAD: space and industrial applications 2 Summary Space applications often dragged power electronics in other fields Space applications often dragged power electronics in other fields Still the aerospace stimulates innovation Still the aerospace stimulates innovation The case of FREDOMSIM for Computer Aided Analysis and Design of SPS for satellites is dealt with here: The case of FREDOMSIM for Computer Aided Analysis and Design of SPS for satellites is dealt with here: _ The Global Star example _ The Global Star example _ Dynamic Models of ISS DC/DC Converters _ Dynamic Models of ISS DC/DC Converters Technical fall-out Technical fall-out

3. Power Electronics CAD: space and industrial applications 3 a)Characterization of the Power Cell in the Frequency Domain b)Assignment of Inner Feedback and Feed Forward compensations c)Assignment of the External Feedback Network d)Closed Loop Characterization e)Connection with Other Circuit Blocks and System Characterization Dynamic Characterization and Control Optimization of the PWM DC-DC Converters

4. Power Electronics CAD: space and industrial applications 4 Dynamic Description in the State Space Discrete Time Z -transform

5. Power Electronics CAD: space and industrial applications 5 Discrete time model automatic build up AVERAGING A, B, C, D Matrices Computation

6. Power Electronics CAD: space and industrial applications 6 a)Characterization of the Power Cell in the Frequency Domain b)Assignment of Inner Feedback and Feed Forward compensations c)Assignment of the External Feedback Network d)Closed Loop Characterization e)Connection with Other Circuit Blocks and System Characterization Dynamic Characterization and Control Optimization of the PWM DC-DC Converters

7. Power Electronics CAD: space and industrial applications 7 F inner feedback matrix G feed-forward matrix Inner feedback and feed-forward compensations

8. Power Electronics CAD: space and industrial applications 8 a)Characterization of the Power Cell in the Frequency Domain b)Assignment of Inner Feedback and Feed Forward compensations c)Assignment of the External Feedback Network d)Closed Loop Characterization e)Connection with Other Circuit Blocks and System Characterization Dynamic Characterization and Control Optimization of the PWM DC-DC Converters

9. Power Electronics CAD: space and industrial applications 9 Power Distribution on the ISS

10. Power Electronics CAD: space and industrial applications 10 switch commands and the inductor current waveform During the short delay between the ON-OFF and OFF-ON commutations, resonant transitions occur involving inductor L and MOSFET parasitic capacitors. Full Bridge Push-Pull PS

11. Power Electronics CAD: space and industrial applications 11 Full Bridge Phase Shifted

12. Power Electronics CAD: space and industrial applications 12 This tool has been used profitably elsewhere Hybrid switching power supplies design Hybrid switching power supplies design Large bandwidth HV generators for high resolution CRTs Large bandwidth HV generators for high resolution CRTs Impedance characterization of inverter fed induction motors Impedance characterization of inverter fed induction motors Dynamic stability forecasts of power distribution systems Dynamic stability forecasts of power distribution systems

13. Power Electronics CAD: space and industrial applications 13 A fall out example: The distributed power supply system Intermediate Bus Architecture (IBA) Front End 48V AC Card cage #3 Card cage #2 Card cage #1 48V Card #3 POL niPOL Converter POL niPOL Converter POL niPOL Converter Isolated Bus Converter Card #2 POL niPOL Converter POL niPOL Converter POL niPOL Converter Isolated Bus Converter Card #1 POL niPOL Converter POL niPOL Converter POL niPOL Converter Isolated Bus Converter 12V Intermediate Bus Converter (IBC) Or Bus Converter (BC)

14. Power Electronics CAD: space and industrial applications 14 The converter for the distributed power supply systems: Suddivisione della tensione in ingresso Suddivisione della tensione in ingresso Minori perdite di conduzione Minori perdite di conduzione Minor rapporto spire Minor rapporto spire Possibile di utilizzo di trasformatori planari Possibile di utilizzo di trasformatori planari Switch in Line Converter (SILC)

15. Power Electronics CAD: space and industrial applications 15 Conclusions The development of FDS was stimulated by space application exigencies The development of FDS was stimulated by space application exigencies It provides a fast and accurate description of the the dynamics and it helps the design optimization It provides a fast and accurate description of the the dynamics and it helps the design optimization It opens up the possibility of worst case analyses of the dynamic performances It opens up the possibility of worst case analyses of the dynamic performances It can be profitably employed also in industrial applications It can be profitably employed also in industrial applications

16. Power Electronics CAD: from space applications to industrial applications P.G. Maranesi, M. Riva Electronic Section – Department of Physics University of Milan Via Celoria 16, 20133 Milano Italy Congresso del Dipartimento di Fisica Highlights in Physics 2005