Abstract
Peak current-mode (PCM) control has been a very popular control method in power electronic converters. The small-signal modeling of the dynamics associated with PCM control has turned out to be extremely challenging. Most of the modeling attempts have been dedicated to the converters operating in continuous conduction mode (CCM) and just a few to the converters operating in discontinuous operation mode (DCM). The DCM modeling method published in 2001 was proven recently to be very accurate when applied to a buck converter. This paper provides the small-signal models for a boost converter and analyses for the first time its real dynamic behavior in DCM. The objectives of this paper are as follows: (i) to provide the full-order dynamic models for the DCM-operated PCM-controlled boost converter; (ii) to analyze the accuracy of the full and reduced-order dynamic models; and iii) to verify the validity of the high-frequency extension applied in the DCM-operated PCM-controlled buck converter in the case of the boost converter. It is also shown that the DCM-operated boost converter can operate only in even harmonic modes, similar to all the CCM-operated PCM-controlled converters. In the case of the DCM-operated PCM-controlled buck converter, its operation in the odd harmonic modes is the consequence of an unstable pole in its open-loop power-stage dynamics.
Highlights
The concept of peak current-mode (PCM) control was launched publicly in 1978 [1,2], and it has become a very popular control method in DC–DC converters
A large number of different modeling attempts has been published for the converters operating in continuous conduction mode (CCM), as discussed in [4], but just a few for the converters operating in discontinuous conduction mode (DCM), such as [5,6,7,8,9]
The main objective of this paper is to provide a comprehensive analysis of the dynamic behavior of a PCM-controlled boost converter operating in DCM including all the relevant parasitic circuit elements
Summary
The concept of peak current-mode (PCM) control was launched publicly in 1978 [1,2], and it has become a very popular control method in DC–DC converters. The modeling method introduced in [8] includes the infinite duty-ratio gain, which takes place at the boundary between the DCM and CCM operations This implies that the existence of the infinite duty-ratio gain at the mode limit between the operations at the switching frequency and its harmonics are characteristic features of PCM control. The main objective of this paper is to provide a comprehensive analysis of the dynamic behavior of a PCM-controlled boost converter operating in DCM including all the relevant parasitic circuit elements. The investigations of this paper show clearly that the modeling technique introduced in [8] will accurately predict the dynamic behavior of the DCM-operated PCM-controlled boost converter, when the relevant parasitic elements are considered [14] and the load-resistor effect is removed [10].
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