US 12,334,831 B2
Unitary charging device for low and high voltages
Sewan Choi, Seoul (KR); and Gi Bum Yu, Seoul (KR)
Assigned to Foundation for Research and Business, Seoul National University of Sicene and Technology, Seoul (KR)
Appl. No. 18/007,741
Filed by FOUNDATION FOR RESEARCH AND BUSINESS, SEOUL NATIONAL UNIVERSITY OF SCIENCE AND TECHNOLOGY, Seoul (KR)
PCT Filed Feb. 2, 2021, PCT No. PCT/KR2021/001383
§ 371(c)(1), (2) Date Dec. 2, 2022,
PCT Pub. No. WO2021/251583, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 10-2020-0069089 (KR), filed on Jun. 8, 2020.
Prior Publication US 2023/0246555 A1, Aug. 3, 2023
Int. Cl. H02M 3/335 (2006.01); H02J 7/00 (2006.01); H02J 7/02 (2016.01); H02M 1/08 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33573 (2021.05) [H02J 7/0013 (2013.01); H02J 7/02 (2013.01); H02M 1/08 (2013.01); H02M 3/01 (2021.05); H02J 2207/20 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A unitary charging device for low and high voltages, the device comprising:
a DC link, for linking DC power converted with respect to AC power externally supplied, to output a DC link voltage
a resonance converter connected to an output terminal of the DC link, for resonating the DC link voltage to transfer an output signal of a frequency resonated;
a high voltage transformer connected to an output terminal of the resonance converter, for stepping up the output signal of the resonance converter to a higher voltage based on a turns ratio thereof; and
a DC-DC converter connected to a secondary side of the high voltage transformer, for converting an output signal of the high voltage transformer into a DC voltage and then link the DC voltage to a high voltage battery to charge the high voltage battery;
a low voltage transformer connected to the DC-DC converter, for shifting a phase of the DC voltage of the DC-DC converter to step down the DC voltage to a lower voltage based on a turns ratio thereof; and
a filter for filtering an output signal of the low voltage transformer,
wherein the secondary side of the high voltage transformer includes a first terminal and a second terminal, and a primary side of the low voltage transformer includes a first terminal and a second terminal,
wherein the second terminal of the secondary side of the high voltage transformer is directly connected to the first terminal of the primary side of the low voltage transformer.