Abstract
This paper details the design and implementation of an efficient 4-kW bidirectional converter with a wide load range, based on a three-phase LCC resonant converter operated in a continuous conduction model, which has a number of advantages pertaining to a bidirectional power supply. The voltage boost-up function yields a high voltage gain without increasing the transformer turn ratio. The high switching frequency, which is achievable by using the soft-switching condition and multiphase operation, decreases the output ripple and helps minimize the size of the output filter, as the requirement for a filter changes after the power flow. Moreover, this reduction in the size of the filters yields economic advantages. In addition, because of the synchronous rectifier operation employed during switching, the conduction loss in the rectifier diode of the proposed converter is low. The direction of the output power can be changed easily, using phase control. The implemented power converter is connected to a 320-V rated generator on one side and 28-V lead-acid batteries on the other side. The functionality of the proposed converter is verified in experiments. We confirmed the high performance of the developed converter in terms of efficiency (92.2%), operable load range (0-12.5 A in step-up, and 0-142 A in step-down), and voltage ripple (0.05%).
| Original language | English |
|---|---|
| Article number | 8314763 |
| Pages (from-to) | 97-105 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 34 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2019 |
Funding
Manuscript received September 25, 2017; revised December 21, 2017 and February 25, 2018; accepted March 4, 2018. Date of publication March 11, 2018; date of current version November 19, 2018. This work was supported in part by the Korea Electrotechnology Research Institute Primary Research Program through the National Research Council of Science and Technology funded by the Ministry of Science, ICT, and Future Planning (MSIP) under Grant 18-12-N0101-28 and in part by the National Research Foundation of Korea funded by the Korea Government (MSIP) under Grant NRF-2017R1A2B 3004855. Recommended for publication by Associate Editor A. Safaee. (Corresponding author: Hong-Je Ryoo.) S.-H. Ahn is with the Accelerator Engineering Team, Pohang Accelerator Laboratory, Pohang 37673, South Korea (e-mail:,[email protected]).
Keywords
- Bidirectional DC-DC converter
- LCC resonant converter
- three-phase resonant converter