<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>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 <italic>switching frequency vs output-power</italic> and <italic>drain-source voltage of switch vs output-power</italic> graphs are presented for the first time. Comparison of bandwidth, phase-margin and gain-margin <italic>vs</italic>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.</p>
</abstract>

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 switching frequency vs output-power and drain-source voltage of switch vs output-power graphs are presented for the first time. Comparison of bandwidth, phase-margin and gain-margin vsinput-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.

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

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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...

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

Publié en ligne: 22 sept. 2022

Pages: 237 - 247

Reçu: 27 mai 2022

DOI: https://doi.org/10.2478/jee-2022-0032

Mots clés
active-clamped flyback, Bode plots, control, cross-regulation, DC-DC converter, inductance measurement, switching-frequency change, transformer

© 2022 Darko Vračar et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Publié en ligne: 22 sept. 2022

Pages: 237 - 247

Reçu: 27 mai 2022

DOI: https://doi.org/10.2478/jee-2022-0032

Mots clésactive-clamped flyback, Bode plots, control, cross-regulation, DC-DC converter, inductance measurement, switching-frequency change, transformer

© 2022 Darko Vračar et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
active-clamped flyback, Bode plots, control, cross-regulation, DC-DC converter, inductance measurement, switching-frequency change, transformer