Translated Title
Hybrid control bidirectional L-LLC resonant converter research on synchronous rectification strategy
Translated Abstract
In distributed energy storage applications,hybrid control is an effective approach to expand the wide-range voltage gain of L-LLC resonant converters,while multi-tube parallel synchronous rectification technology is the main method to reduce switch device on-state losses and improve efficiency.This paper analyzes the different oper-ating modes in hybrid control and concludes that the converter operates with the rectifier-side current in an intermit-tent state.Furthermore,it is found that the synchronization rectification driving timing needs to be coordinated dif-ferently with the inverter-side switching timing based on the control method.Therefore,a synchronous rectification control strategy is proposed,which combines the inverter-side switching timing with external detection of the rectifi-er-side current.Compared to other control strategies,the proposed method does not require complex external detec-tion circuits,and the control approach is simple and less susceptible to stray parameter effects.It is suitable for bi-directional converters in wide-range and high-current applications.Finally,an experimental prototype with a high-side voltage range of 280～430 V,low-side voltage range of 36～54 V,forward power transmission of 25 kW,and reverse power transmission of 2 kW is constructed to verify the proposed method.The experimental results demon-strate the feasibility and reliability of the proposed synchronous rectification control strategy.
Translated Keyword
bidirectional DC/DC converter
high current
hybrid control
synchronous rectification
wide range
Access Number
WF:perioarticaldgdn202503004
