Modern Control Engineering
International Journal of Circuit Theory and Applications
Technical communique: On stability of second-order quasi-polynomials with a single delay
Automatica (Journal of IFAC)
An improved single-stage Flyback PFC converter for high-luminance lighting LED lamps
International Journal of Circuit Theory and Applications
Application of Filippov method for the analysis of subharmonic instability in dc–dc converters
International Journal of Circuit Theory and Applications
Stabilizing technique for AC-DC boost PFC converter based on time delay feedback
IEEE Transactions on Circuits and Systems II: Express Briefs
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Power factor correction converters are power electronics circuits used as AC-DC power supplies. These systems are well known to exhibit nonlinear phenomena such as subharmonic oscillations and chaotic regimes. These undesirable behaviors increase the THD and therefore can jeopardize enormously the system performances. In this paper, time delay feedback control is applied to stabilize a two-stage power factor correction AC-DC converter when it exhibits these instabilities under traditional controllers. This control technique introduces many advantages to the most and widely used average current mode control through widening the stability domain of the system. By appropriately selecting the time delay feedback gain and the time delay period, the undesirable subharmonic components are eliminated, whereas the desired ones remain unchanged. A harmonic balance approach is used for studying the dynamics of the system under the new control scheme and to obtain the stabilization domain. Copyright © 2010 John Wiley & Sons, Ltd.