US 11,870,360 B2
Bidirectional insulating DC-DC converter, control apparatus therefor, and operating method thereof
Du Ho Kim, Yongin-si (KR); Deok Kwan Choi, Yongin-si (KR); Min Heo, Seongnam-si (KR); Kang Min Kim, Seoul (KR); Soo Min Jeon, Yongin-si (KR); A Ra Lee, Seongnam-si (KR); Won Gon Kim, Yongin-si (KR); Ji Hoon Park, Suwon-si (KR); Hyun Woo Shim, Suwon-si (KR); and Tae Ho Bang, Seoul (KR)
Assigned to HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed by HYUNDAI MOBIS Co., Ltd., Seoul (KR)
Filed on Dec. 15, 2021, as Appl. No. 17/551,819.
Claims priority of application No. 10-2020-0175909 (KR), filed on Dec. 15, 2020.
Prior Publication US 2022/0190734 A1, Jun. 16, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/44 (2007.01); H02M 1/00 (2006.01); H02J 7/00 (2006.01); B60L 53/20 (2019.01)
CPC H02M 3/33584 (2013.01) [H02J 7/007 (2013.01); H02M 1/0009 (2021.05); B60L 53/20 (2019.02); B60L 2210/10 (2013.01); H02J 2207/20 (2020.01); H02M 1/44 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A bidirectional insulating DC-DC converter comprising:
a first battery and a second battery, a discharge voltage of the first battery being relatively higher than that of the second battery;
a step-down circuit configured to step down a voltage applied from the first battery and output the stepped-down voltage to the second battery; and
a step-up circuit connected in parallel to the step-down circuit and configured to step up a voltage applied from the second battery and output the stepped-up voltage to the first battery,
wherein the step-down circuit includes an active clamp forward converter circuit, and the step-up circuit includes an active clamp flyback converter circuit, and
wherein the step-down circuit comprises:
a current transformer configured to convert a current value into a voltage and detect the current value for current control of a first voltage stage which is an input part of the step-down circuit;
a semiconductor switch element in the first voltage stage configured to alternately switch the voltage of the first battery so as to perform a function of the active clamp forward converter;
a transformer configured to step down the voltage switched by the semiconductor switch element in the first voltage stage, transfer the stepped-down voltage to a second voltage stage, and electrically insulate the first voltage stage from the second voltage stage; and
semiconductor switch elements in the second voltage stage configured to rectify a voltage output from the transformer.