TY - GEN
T1 - Hybrid Phase-Frequency Control-enabled Global Loss Minimization of a Full-Bridge LLC Converter under Wide Gain and Load-range Operation
AU - Ishraq, Naveed
AU - Dey, Saikat
AU - Mallik, Ayan
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - In this paper, a loss optimized hybrid phase-frequency control of LLC converter is proposed, investigated, and validated for aircraft auxiliary power unit (APU) onboard charging applications. The proposed control method emphasizes on achieving minimum power loss by adopting an optimum duty cycle of LLC tank input voltage based on the existing load and gain conditions while the output voltage regulation is realized by controlling the frequency sweep. In comparison to the conventional frequency-controlled LLC converter, the proposed methodology can achieve a wider gain range with a lower frequency sweep by including an optimized phase-shift control. A proof-of concept 500W LLC converter, generating 20-28 V output from the 270-V dc link is designed and tested to verify the claims of the proposed hybrid control technique. The experimental results demonstrate the effectiveness of the phase-frequency control by exhibiting a peak conversion efficiency of 96.7% at full load with an average efficiency improvement of 7.5% at 20% rated load over the conventional frequency-based control alone.
AB - In this paper, a loss optimized hybrid phase-frequency control of LLC converter is proposed, investigated, and validated for aircraft auxiliary power unit (APU) onboard charging applications. The proposed control method emphasizes on achieving minimum power loss by adopting an optimum duty cycle of LLC tank input voltage based on the existing load and gain conditions while the output voltage regulation is realized by controlling the frequency sweep. In comparison to the conventional frequency-controlled LLC converter, the proposed methodology can achieve a wider gain range with a lower frequency sweep by including an optimized phase-shift control. A proof-of concept 500W LLC converter, generating 20-28 V output from the 270-V dc link is designed and tested to verify the claims of the proposed hybrid control technique. The experimental results demonstrate the effectiveness of the phase-frequency control by exhibiting a peak conversion efficiency of 96.7% at full load with an average efficiency improvement of 7.5% at 20% rated load over the conventional frequency-based control alone.
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U2 - 10.1109/ECCE50734.2022.9947485
DO - 10.1109/ECCE50734.2022.9947485
M3 - Conference contribution
AN - SCOPUS:85144008448
T3 - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
BT - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Y2 - 9 October 2022 through 13 October 2022
ER -