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customer application.
SAT can be used to assess the common-mode stability characteristics of a
paralleled converter system by analyzing an equivalent single-module system. The
single-module equivalent is obtained by scaling the load by the number of
paralleled modules. For example, in a two module parallel system, the load is
scaled by a factor of two by doubling the load resistance, ESR’s and ESLs, and
reducing the capacitances by half. The results from SAT are then valid for the
paralleled converter system as well
This method assumes that the layout is symmetrical in the sense that all
parasitic impedances between the modules and the load are substantially equal
and the sense locations of all modules are the same. If there is any discrepancy,
then the single equivalent module approach will yield a different answer than the
actual paralleled system.
References
[1] V. Joseph Thottuvelil, George C. Verghese, “Analysis and Control Design of Paralleled DC/DC
Converters with Current Sharing”, IEEE Trans. On Power Electronics, July 1998, pp. 635-644.
[2] Cahit Gezgin, Wayne C. Bowman, V. Joseph Thottuvelil, “A Stability Analysis Tool for DC-DC
Converters”, IEEE Applied Power Electronics Conference 2002, vol.1, pp. 367-373.