Digital Adaptive Frequency Modulation for Bidirectional DC-DC Converter

This paper introduces a digital adaptive control method for a bidirectional dc/dc charger/discharger, which is the core element for reliable and efficient energy storage systems. The proposed method achieves zero-voltage switching (ZVS) without the use of an auxiliary zero-crossing detection (ZCD) c...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2013-11, Vol.60 (11), p.5167-5176
Main Authors: Baek, Jong-Bok, Choi, Woo-In, Cho, Bo-Hyung
Format: Article
Language:English
Subjects:
Batteries
Bidirectional converter
digital control
Frequency modulation
Inductance
Inductors
multiphase interleaving
Switches
Switching frequency
Zero voltage switching
zero-voltage switching (ZVS)
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Summary:This paper introduces a digital adaptive control method for a bidirectional dc/dc charger/discharger, which is the core element for reliable and efficient energy storage systems. The proposed method achieves zero-voltage switching (ZVS) without the use of an auxiliary zero-crossing detection (ZCD) circuit. To satisfy ZVS conditions, proper switching frequency is determined through a digital calculation. It features soft switching over wide input and output ranges. Because this method does not require a ZCD circuit, it is easily implemented with bidirectional operation and reduces instability and noise susceptibility problems. To reduce conduction loss, a multiphase interleaving technique is applied. This interleaving method reduces the required capacitance by decreasing the current ripple. A phase shedding technique is also implemented to achieve higher efficiency over a wide load range. The operation of the proposed digital adaptive control method is analyzed. For experimental verification, a 200-W two-phase-interleaved bidirectional synchronous buck converter with 30-38-V bus voltage and 15-25-V battery voltage is implemented.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2224075