| Title |
Wireless Power Charging System Capable of Soft-Switching Operation Even in Wide Air Gaps |
| Authors |
Yu-Jin Moon ; Jeong-Won Woo ; Eun-Soo Kim ; In-Gab Hwang ; Jong-Seob Won ; Sung-Soo Kang |
| DOI |
https://doi.org/10.6113/TKPE.2022.27.6.515 |
| Keywords |
WPT(Wireless Power Transfer); Single stage DC-DC converter; AGV(Automated Guided Vehicle); SS(Series-Series) compensation circuit |
| Abstract |
The wireless power transfer (WPT) charging system for AGV depends highly on the coupling conditions due
to air gap variation. To attain stable output power with high transfer efficiency under various coupling
conditions, a single-stage, DC-DC converter that operates with robustness to changes in air gaps is proposed
for the WPT system. The proposed converter is capable of soft switching under the set input voltage (Vin: 380
VDC), load conditions (0?1 kW), and air gap changes (30?70 mm). In addition, a wide output voltage range
(Vo: 39?54 VDC) can be controlled by varying the link voltage due to the phase control at a fixed switching
frequency. Experimental results are verified using a prototype of a 1 kW wireless power charging system. |