Gardena, CA (April 14, 2003) -- Intusoft announced today a unique offering based on a mathematical model of a control system called, "General Feedback Theorem" (GFT). Dr. R. David Middlebrook with the California Institute of Technology developed the theorem. The principle arises from application of a bi-linear transform, originally described by Bode in 1945. Middlebrook extended Bode's work with his Extra Element Theorem (EET), then successively by applying the EET within a control loop using voltage and current sources instead of impedances. The GFT can be used to measure open loop control system characteristics, but while the loop is closed, thereby preserving correct loading and DC bias along the path.
switch-mode power supply (SMPS) circuits do not exhibit an appropriate
place to break a closed loop topology because the control circuitry is
inaccessible. For instance, breaking the loop to measure open loop gain
is disruptive and removes natural loading at the cut point. Moreover,
the DC operating point is difficult to establish with the loop open. But
with GFT elements, a fast and viable means of measuring SMPS closed loop
performance is achieved without disrupting the intended loop configuration.
Director of Marketing, Intusoft
Direct (925) 600-7445
Tele (310) 329-3295 Fax (310) 329-9864