Multifunctional Onboard Charger for Electric Vehicles Integrating a Low-Voltage DC–DC Converter and Solar Roof
- Authors
- Lee, Jeong; Won, Jehyuk
- Issue Date
- Feb-2024
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Batteries; Low voltage; Load flow; Inverters; Inductors; Vehicle-to-grid; Transformers; Electric vehicle (EV); multifunctional onboard charger (OBC); OBC; photovoltaic (PV); solar roof
- Citation
- IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, v.12, no.1, pp 283 - 294
- Pages
- 12
- Journal Title
- IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
- Volume
- 12
- Number
- 1
- Start Page
- 283
- End Page
- 294
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91163
- DOI
- 10.1109/JESTPE.2023.3309974
- ISSN
- 2168-6777
2168-6785
- Abstract
- A multifunctional onboard charger (OBC) is proposed that integrates the power conversion circuits for a high-voltage battery (HVB) and low-voltage battery (LVB), where the solar roof is attached to the electric vehicle (EV). Control methods are presented for systematic operation in four modes depending on the energy sources [i.e., ac grid and photovoltaics (PVs)] and batteries (i.e., HVB and LVB): grid-to-vehicle (G2V), vehicle-to-grid (V2G), HVB-to-LVB (H2L), and HVB + PV-to-LVB (HP2L). The proposed OBC reduces the dc-link capacitance by including an active power decoupling (APD) circuit in the front-end. In addition, the proposed OBC achieves a high power density and efficiency by selective operation of the topology depending on the mode. Previous studies were limited by the rated power of the low-voltage dc-dc converter (LDC), but the proposed OBC can effectively use power from the solar roof while charging the HVB and LVB simultaneously. A 3.3-kW prototype of the proposed OBC was designed, and experiments were performed to verify the waveforms and efficiency of the operating modes and control methods.
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