Design and Implementation of Half-Bridge Resonant Converter With Novel Primary-Side Control

The opto-coupler is usually used for isolated resonant converter to feedback the secondary-side output information. However, the characteristics of the opto-coupler are easily affected by the operating conditions, which will cause higher standby power loss. In this article, a novel primary-side cont...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 35; no. 5; pp. 5408 - 5416
Main Authors Liang, Tsorng-Juu, Lin, Chi-Hung, Tseng, Wei-Jing, Lin, Yu-Meng
Format Journal Article
LanguageEnglish
Published New York IEEE 01.05.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bridges
Converters
Couplers
Detectors
Electric bridges
Electric potential
Estimation
Half bridge resonant converter
Microcontrollers
output current estimation
output voltage estimation
Power loss
primary side control
Resonant converters
Voltage
Voltage control
Voltage measurement
Windings
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Summary:The opto-coupler is usually used for isolated resonant converter to feedback the secondary-side output information. However, the characteristics of the opto-coupler are easily affected by the operating conditions, which will cause higher standby power loss. In this article, a novel primary-side controlled isolated half-bridge resonant converter with output voltage and current estimation for LLC and series resonant converter (SRC) operations is presented. The output voltage is estimated by sampling the auxiliary winding voltage when the output diode current flows to zero, the output current is estimated by integrating the resonant current until the transformer decoupled. The operating principles of the half-bridge resonant converter and the design criteria of the key component parameters are addressed and analyzed. Also, the methods for estimating output voltage and output current are discussed in detail. Finally, an experimental prototype with rated power 100 W half-bridge resonant converter for input voltage 280-342 V and output voltage 24 V is built with microcontroller to validate the proposed primary-side regulation technique. Experimental results show the output voltage and current can be controlled with the error less than 1% and 8%, respectively. The highest efficiency of the system is 95.2%.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2943932