A Bidirectional LLC Resonant Converter With Automatic Forward and Backward Mode Transition

  • September 8, 2015
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A Bidirectional LLC Resonant Converter With Automatic Forward and Backward Mode Transition

 ABSTRACT

All the switches in the proposed topology can achieve soft switching. Compared with traditional isolated bidirectional dc–dc converters such as dual active bridge converter, the reverse energy and turn-off loss are reduced dramatically, and the conversion efficiency can be much improved. With the proposed new control scheme, the power flow direction and output power of the proposed converter can be changed automatically and continuously, which is attractive for energy storage systems to balance the energy and to keep the dc-bus voltage constant.

CIRCUIT DIAGRAM

 

 1

EXISTING SYSTEM

Various bidirectional dc–dc topologies have been proposed and studied in the past decades. For safety consideration, the galvanic isolation is usually required. Among these isolated topologies, the dual active bridge (DAB) converter has attracted lots of research interests due to its simple structure, wide range soft switching capability, and high efficiency. The DAB converter has two bridge type switches in each side of the transformer, and the phase shift angle between the primary side switches and the secondary side switches determines the power flow direction and its output power. However, it suffers from high reverse energy and high turn-off power loss which deteriorate the overall efficiency. A lot of methods have been proposed to further improve its efficiency and performance.

PROPOSED SYSTEM

  • In this project, the forward mode means the battery delivers energy to the dc bus, which is a discharging mode. And the backward mode is a charging mode.

 

  • This project proposes an improved bidirectional LLC resonant topology with a new control scheme. All the switches in the proposed topology can achieve soft switching. Compared with traditional isolated bidirectional dc–dc converters such as dual active bridge converter, the reverse energy and turn-off loss are reduced dramatically.

 

  • And the conversion efficiency can be much improved. With the proposed new control scheme, the power flow direction and output power of the proposed converter can be changed automatically and continuously, which is attractive for energy storage systems to balance the energy and to keep the dc-bus voltage constant.

TOOLS AND SOFTWARE USED:

  • MP LAB
  • ORCAD/PSPICE
  • MATLAB/SIMULINK

OUTPUT:

  • HARDWARE
  • SIMULATION

REFERENCE:

Tianyang Jiang, Junming Zhang, Senior Member, IEEE, XinkeWu, Member, IEEE,

Kuang Sheng, Senior Member, IEEE, and Yousheng Wang, “A Bidirectional LLC Resonant Converter With Automatic Forward and Backward Mode Transition”,  IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 30, NO. 2, FEBRUARY 2015.

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