US 11,955,273 B2
Low-voltage DC-DC converter including zero voltage switching and method of driving same
Won Gon Kim, Yongin-si (KR)
Assigned to Hyundai Mobis Co., Ltd., Seoul (KR)
Filed by Hyundai Mobis Co., Ltd., Seoul (KR)
Filed on Feb. 25, 2021, as Appl. No. 17/185,421.
Application 17/185,421 is a continuation of application No. 16/513,195, filed on Jul. 16, 2019, granted, now 10,978,952.
Claims priority of application No. 10-2018-0083575 (KR), filed on Jul. 18, 2018.
Prior Publication US 2021/0184581 A1, Jun. 17, 2021
Int. Cl. H01F 3/14 (2006.01); H01F 27/24 (2006.01); H02M 1/00 (2006.01); H02M 3/24 (2006.01); H02M 3/335 (2006.01); H02M 3/00 (2006.01)
CPC H01F 3/14 (2013.01) [H01F 27/24 (2013.01); H02M 1/0058 (2021.05); H02M 3/24 (2013.01); H02M 3/33573 (2021.05); H02M 3/003 (2021.05)] 4 Claims
OG exemplary drawing
 
1. A method for setting an air gap in a core region and a turns ratio of a transformer of a low-voltage DC-DC converter, the method comprising:
setting a power switching element based on a voltage/current capacity and a parasitic capacitance;
setting a minimum inductance to secure a zero voltage switching operation of the power switching element;
adjusting the air gap in the core region and the turns ratio of the transformer based on an input voltage range of the transformer;
calculating a leakage inductance of the transformer;
comparing the minimum inductance with the leakage inductance; and
adaptively adjusting the air gap and the turns ratio based on a result of the comparing,
wherein the air gap in the core region is set on a basis of a magnetizing inductance, the number of primary turns, a magnetic resistance of the core region, and a magnetic resistance of the air gap.