US 11,863,056 B2
Apparatus and method for measuring low load current
Min Sang Park, Yongin-si (KR); Dongjin Keum, Seoul (KR); and Byoungmook Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jan. 5, 2022, as Appl. No. 17/569,075.
Claims priority of application No. 10-2021-0025965 (KR), filed on Feb. 25, 2021.
Prior Publication US 2022/0271660 A1, Aug. 25, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 3/157 (2006.01)
CPC H02M 1/0009 (2021.05) [H02M 3/157 (2013.01); H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus configured to measure a load current provided to a load of a switching converter, the apparatus comprising:
a pulse generation circuit configured to generate a control pulse based on a power switch driving signal of the switching converter;
a reference current generation circuit configured to generate a reference current based on the control pulse;
a clock generation circuit configured to generate a clock signal based on the control pulse and the reference current; and
a clock counter configured to count a number of cycles of the clock signal during a switching period of the switching converter,
wherein the reference current generation circuit is configured to adjust the reference current to compensate for a leakage current generated in the clock generation circuit during the switching period.