TY - GEN
T1 - Small-Signal Dynamics of Current-Mode Controlled Active Clamp Forward Converter with Main Switch Current Feedback
AU - Lee, Dongheon
AU - Kang, Yonghan
AU - Choi, Byungcho
AU - Cha, Honnyong
N1 - Publisher Copyright:
© 2023 The Korean Institute of Power Electronics.
PY - 2023
Y1 - 2023
N2 - Active clamp forward converters (ACFCs) with current mode control are widely used for low voltage/high current applications. Current mode control for ACFCs usually employs the current feedback from the main switch at the primary side of the isolation transformer, which carries both the reflected inductor current and the transformer magnetizing current. With the additional magnetizing current feedback, the power stage dynamics with current loop closed are markedly altered from the case of the inductor-current only feedback. This paper analyzes the power stage dynamics and presents a factorized expression for the control-to-output transfer function with current loop closed, thus providing the new and exact information about the control design for the main switch current feedback. The accuracy of the proposed control-to-output transfer function is validated by both computer simulations and experimental measurements. The implication, significance, and utility of the new transfer function are addressed.
AB - Active clamp forward converters (ACFCs) with current mode control are widely used for low voltage/high current applications. Current mode control for ACFCs usually employs the current feedback from the main switch at the primary side of the isolation transformer, which carries both the reflected inductor current and the transformer magnetizing current. With the additional magnetizing current feedback, the power stage dynamics with current loop closed are markedly altered from the case of the inductor-current only feedback. This paper analyzes the power stage dynamics and presents a factorized expression for the control-to-output transfer function with current loop closed, thus providing the new and exact information about the control design for the main switch current feedback. The accuracy of the proposed control-to-output transfer function is validated by both computer simulations and experimental measurements. The implication, significance, and utility of the new transfer function are addressed.
KW - active clamp
KW - asymptotic analysis
KW - coefficient matching
KW - current mode control
KW - forward converter
KW - primary current feedback
UR - http://www.scopus.com/inward/record.url?scp=85170644745&partnerID=8YFLogxK
U2 - 10.23919/ICPE2023-ECCEAsia54778.2023.10213660
DO - 10.23919/ICPE2023-ECCEAsia54778.2023.10213660
M3 - Conference contribution
AN - SCOPUS:85170644745
T3 - ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics
SP - 2169
EP - 2175
BT - ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia
Y2 - 22 May 2023 through 25 May 2023
ER -