Implementation of digitally controlled phase shift full bridge converter for server power supply

The digital controller of the phase-shift full bridge converter for a server power supply is designed and implemented in this paper. Analog controllers are replaced by single MCU (micro controller unit) that not only manages the protection or the operational flow of a power supply but also controls...

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Bibliographic Details
Published in2010 IEEE Energy Conversion Congress and Exposition pp. 802 - 809
Main Authors Je-Hyung Cho, Hyun-Wook Seong, Shin-Myung Jung, Jin-Sik Park, Gun-Woo Moon, Myung-Joong Youn
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2010
Subjects
adaptive control
Bandwidth
Converters
digital control
Gain
gain scheduling
Inductance
magnetizing current offset
phase shift full bridge
Power supplies
server power supply
Servers
Voltage control
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Summary:The digital controller of the phase-shift full bridge converter for a server power supply is designed and implemented in this paper. Analog controllers are replaced by single MCU (micro controller unit) that not only manages the protection or the operational flow of a power supply but also controls the converter. Voltage mode controller is designed based on the z-domain small signal model considering effect of variation on output filter inductance. Moreover, gain scheduling is applied to adjust the controller gain according to load current. The current offset flowing through a magnetizing inductor is eliminated by adding PI compensator instead of inserting a blocking capacitor that may increase loss, cost, and volume. The saturation of a transformer and the conduction loss due to the current offset can be prevented. The performance of designed controller is verified by the experiments on 1.2kW phase-shift full bridge converter.
ISBN:1424452864
9781424452866
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2010.5617915