Active-clamped flyback DC-DC converter in an 800V application: Design notes and control aspects

This paper presents findings for active-clamped flyback (ACF) DC-DC converter 57 W used as an auxiliary power-supply of a wireless inductive-charging system 800 V. Measurements of magnetizing and leakage inductances for three transformers demonstrated how big differences between them could be depend...

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Bibliographic Details
Published in:Journal of Electrical Engineering 2022-08, Vol.73 (4), p.237-247
Main Authors: Vračar, Darko, Pejović, Predrag
Format: Article
Language:English
Subjects:
active-clamped flyback
Auxiliary power units
Bandwidths
Bode plots
Clamping
Compensators
control
cross-regulation
DC-DC converter
Electric potential
Electrical engineering
inductance measurement
Load
switching-frequency change
transformer
Voltage
Voltage converters (DC to DC)
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Summary:This paper presents findings for active-clamped flyback (ACF) DC-DC converter 57 W used as an auxiliary power-supply of a wireless inductive-charging system 800 V. Measurements of magnetizing and leakage inductances for three transformers demonstrated how big differences between them could be depending on chosen vendor. Comparison of simulated and measured Bode plots showed that, even when those plots were not matched, one could design a compensator that ensures stable operation. Evaluation of cross-regulation when output with low power (9.62 % of total) was regulated showed that such approach was feasible too. The and graphs are presented for the first time. Comparison of bandwidth, phase-margin and gain-margin input-power, between the ACF and conventional flyback converter were discussed too. Those quantities were changeable with load and input-voltage as expected. The conventional flyback converter in DCM has higher bandwidth than the ACF which resulted in lower phase- and gain-margins. That showed that it cannot have the same compensator as an ACF.
ISSN:1339-309X
1335-3632
1339-309X
DOI:10.2478/jee-2022-0032