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Transient Behavior and Frequency Response of Constant Frequency One Cycle Charge Control Modulator (O3C)

Marques, H. ; Borges, B. ; Anunciada, A.

IEEE Transactions on Power Electronics Vol. 23, Nº 5, pp. 2507 - 2515, September, 2008.

ISSN (print): 0885-8993
ISSN (online):

Journal Impact Factor: 3,483 (in 2008)

Digital Object Identifier: 10.1109/TPEL.2008.2002064

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Abstract
This paper presents a new pulse width modulator
capable of adjusting the conversion duty ratio so that the necessary
output filter charge will reach its steady-state value in only
one switching period, when any disturbance of the input voltage,
output current or output voltage occurs. The proposed modulator
is based on the calculation of the variation of the electric charge
required to restore the steady-state operation in only one switching
period, and therefore is designated by one cycle charge control
(O3C). The synthesis of the proposed modulator is presented
in detail. It will be also shown, theoretically, by simulation and
experimentally, that the use of this modulator in a buck converter
presents as a major advantage, the fact that the output voltage
gain is not limited by the cutoff frequency of the output filter. As a
consequence, very low output ripple can be achieved without compromising
the dynamic response of the converter. Comparative
simulation results considering the presented modulator and the
conventional one cycle control, both applied to a buck converter
in the same conditions, are also presented.