Parasitic Capacitance Effects on Active Clamp Flyback Output Characteristics: Application to IPOP Connection

Jacinto M. Jiménez-Martínez, Esther de Jódar and José Villarejo
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Jacinto M. Jiménez-Martínez: Automatic and Electrical Engineering and Electronic Technology Department, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain
Esther de Jódar: Automatic and Electrical Engineering and Electronic Technology Department, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain
José Villarejo: Automatic and Electrical Engineering and Electronic Technology Department, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain

Energies, 2022, vol. 15, issue 9, 1-18

Abstract: Different mechanisms for balancing power between parallel connected modules have been presented in recent years. They have been broadly classified into active and passive methods. The high output impedance of topologies, including active clamp networks, suggests that they can achieve output current sharing passively when they are connected in parallel. However, some parasitic elements, such as stray capacitances and leakage inductances, have not been considered in the theoretical analyses. Moreover, these need to be taken into account when a high step-up ratio is required because they modify the behavior and output impedance of a module, which changes the current balance. This paper presents a detailed analysis of the influence of parasitic capacitances on active clamp flyback converters that were parallel connected, using the output impedance as a current self-balance method. The proposed solution to alleviate the negative effects on current balance was also studied and validated as a successful method that did not increase the complexity of the controller. Finally, the results that were obtained using an experimental prototype with two 100W modules helped to verify the theoretical results.

Keywords: DC–DC power conversion; active clamp flyback; parallel connected modules; current sharing; output impedance; high step-up voltage ratio (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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