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Investigations of Stability & Dynamic Performances of a Current-Injected Regulator

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3 Author(s)
Lee, F.C. ; Virginia Polytechnic Institute and State University ; Carter, R.A. ; Fang, Z.D.

The stability and dynamic performances of a buck/boost regulator employing a current-injected control are examined. Small-signal models for the power state, the multiloop error processor, and the duty-cycle pulse modulator are developed. The error-processor model which incorporates the current-injected loop, the dc loop, and the compensation network permits evaluation of the effects of each individual control loop and their combined efforts toward shaping the performance characteristics of the closed-loop system. Comparisons are made between this modeling approach and earlier approaches. Some important yet subtle dissimilarities are discussed. This model predicts the constant-frequency 50-percent duty-cycle instability which is inherent to the current-injected control.

Published in:

Aerospace and Electronic Systems, IEEE Transactions on  (Volume:AES-19 ,  Issue: 2 )

Date of Publication:

March 1983

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