Hybrid Control Strategy for Single-Stage Interleaved Totem-Pole LLC AC-DC Converter With Input and Output Power Decoupling

This article proposes a hybrid control strategy for a single-stage interleaved totem-pole LLC ac-dc converter. Because the totem-pole power factor correction front cell provides bidirectional inductor current, this converter is restricted by operating in continuous conduction mode or critical conduc...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-05, Vol.39 (5), p.5135-5154
Main Authors: Zhou, Buxiang, Zhao, Chongfu, Luo, Huan, Qiu, Yiwei, Chen, Shi, Zang, Tianlei, Zhou, Yi, Zhou, Xiang, Zhao, Hongbo
Format: Article
Language:English
Subjects:
AC-DC converters
AC–DC power converters
Computer architecture
Control systems
Decoupling
Electric potential
Frequency modulation
Frequency variation
Hybrid control
Inductors
LLC resonant converter
Mathematical analysis
Power factor
power factor correction
Power generation
Pulse duration modulation
Pulse frequency modulation
resonant converters
single-stage
Switches
Switching frequency
Time domain analysis
Voltage
Voltage control
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Summary:This article proposes a hybrid control strategy for a single-stage interleaved totem-pole LLC ac-dc converter. Because the totem-pole power factor correction front cell provides bidirectional inductor current, this converter is restricted by operating in continuous conduction mode or critical conduction mode. The traditional control strategy shows a variable duty cycle of the resonant tank voltage to the instantaneous ac input voltage. Therefore, the line-frequency variation from the ac input-end will be easily interfaced with the load and bring a large fluctuation of output voltage. To tackle this issue, this article proposed a novel control strategy that utilizes pulsewidth modulation (PWM) to shape the input current, and pulse frequency modulation to regulate the output voltage. As a positive consequence, the large output voltage ripple brought by the variation of duty cycle for traditional PWM-based control is therefore effectively compensated by the variation of switching frequency, and the power decoupling between the ac pulse input power and constant dc output power is achieved. The numerical-based calculation method is utilized to develop the time-domain analysis of the converter, and a 500 W/150 V experimental prototype has been built to verify the proposed control strategy and theoretical analysis.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3354249