Abstract
Power converters are the typical switched systems which operate based on the alternate switching of the semiconductor switches. The operating mode of power converters consists of several operating stages in one switching period. Each operating stage refers to a sub-circuit or equivalent circuit where different sub-circuits are switched in a fixed order according to the control strategy design. Power converter may operate in different operating modes even with the same control scheme, for example, the DC-DC converter has differing performance under the continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Thus, it is necessary to have a comprehensive understanding of the converter's characteristics in advance to avoid undesired operation in practice. In this paper, the power converter is considered as a graph made up of several meshes. All sub-circuits in power converter can then be obtained by the mesh combination algorithm, and the operating mode can be constructed by considering the preset switching ON/OFF scheme. Ultimately, the typical waveforms in different modes can be predicted, which is useful to identify abnormal phenomena. Cúk converter is taken as an example to demonstrate the proposed multiple mode analysis method. It is found that there are four kinds of phenomena in addition to the well-known CCM and DCM. Finally, the experimental results are provided and show good agreement with the theoretical analysis.
Highlights
Power electronic systems can meet the demand of energy transfer between different electrical forms and efficient use of electricity
As control strategy is specific to a certain topology, the topology determines the control system and power converter topology becomes a key element in the development of power electronics
As the power converter can be transferred to a graph where the components of power converter are considered as the edges of graph[13], this paper intends to find all of the sub-circuits that may exist in the power converter by using the mesh combination algorithm [14,15,16], and obtains the operating modes by assembling the effective sub-circuits based on the operating principle of power converter and the switch control strategy
Summary
Power electronic systems can meet the demand of energy transfer between different electrical forms and efficient use of electricity. After the novel topology is proposed, the operating mode of power converter is defined, and the small signal modeling and control loop design are carried out for the desired operating mode. The power converter is found to have other operating modes different from the desired one even if the switching control strategy is not changed[10]. As the power converter can be transferred to a graph where the components of power converter are considered as the edges of graph[13], this paper intends to find all of the sub-circuits that may exist in the power converter by using the mesh combination algorithm [14,15,16], and obtains the operating modes by assembling the effective sub-circuits based on the operating principle of power converter and the switch control strategy.
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