Power Electronics CAD: from space applications to industrial applications

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

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

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Dynamic Characterization and Control Optimization
of the PWM DC-DC Converters

1. Characterization of the Power Cell in the
   Frequency Domain
2. Assignment of Inner Feedback and Feed Forward
   compensations
3. Assignment of the External Feedback Network
4. Closed Loop Characterization
5. Connection with Other Circuit Blocks and System
   Characterization

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Dynamic Description in the State Space Discrete
Time
Z-transform
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Discrete time model automatic build up
AVERAGING
A, B, C, D Matrices Computation
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Dynamic Characterization and Control Optimization
of the PWM DC-DC Converters

1. Characterization of the Power Cell in the
   Frequency Domain
2. Assignment of Inner Feedback and Feed Forward
   compensations
3. Assignment of the External Feedback Network
4. Closed Loop Characterization
5. Connection with Other Circuit Blocks and System
   Characterization

7
Inner feedback and feed-forward compensations
F inner feedback matrix G feed-forward matrix
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Dynamic Characterization and Control Optimization
of the PWM DC-DC Converters

1. Characterization of the Power Cell in the
   Frequency Domain
2. Assignment of Inner Feedback and Feed Forward
   compensations
3. Assignment of the External Feedback Network
4. Closed Loop Characterization
5. Connection with Other Circuit Blocks and System
   Characterization

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Power Distribution on the ISS
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Full Bridge Push-Pull PS
During the short delay between the ON-OFF and
OFF-ON commutations, resonant transitions occur
involving inductor L and MOSFET parasitic
capacitors.
switch commands and the inductor current waveform
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Full Bridge Phase Shifted
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This tool has been used profitably elsewhere

• Hybrid switching power supplies design
• Large bandwidth HV generators for high resolution
  CRTs
• Impedance characterization of inverter fed
  induction motors
• Dynamic stability forecasts of power distribution
  systems

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A fall out exampleThe distributed power supply
system
Intermediate Bus Architecture (IBA)
48V
Card 1
12V
Intermediate Bus Converter (IBC) Or Bus
Converter (BC)
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The converter for the distributed power supply
systems
Switch in Line Converter (SILC)

• Suddivisione della tensione in ingresso
• Minori perdite di conduzione
• Minor rapporto spire
• Possibile di utilizzo di trasformatori planari

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Conclusions

• 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 opens up the possibility of worst case
  analyses of the dynamic performances
• It can be profitably employed also in industrial
  applications

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