This paper investigates the buck cell operating in discontinuous conduction mode based on an approximate discrete-time difference equation. A qualitative discussion of the steady-state and open-loop dynamic behaviour is first presented. A linearised small-signal equation is derived which leads to a linear feed-forward/feed-back control law for regulating this type of converter. This conventional linear scheme provides satisfactory control in the neighbourhood of the operating point but ceases to meet the requirement as soon as the small-signal assumption is violated. A non-linear control law, whose validity extends over a wider range of fluctuation of the variables about the operating point, is proposed along with some simulation results which confirm the superiority of the proposed non-linear control over its linear counterpart.
|Number of pages||13|
|Journal||Journal of Electrical and Electronics Engineering, Australia|
|Publication status||Published - 1 Sep 1990|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering