US 11,943,853 B2
Full voltage sampling circuit, driving chip, LED driving circuit and sampling method
Zhen Li, Shanghai (CN); Weijia Yu, Shanghai (CN); and Minmin Fan, Shanghai (CN)
Assigned to SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed by SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed on Nov. 2, 2022, as Appl. No. 18/051,882.
Claims priority of application No. 202111637680.4 (CN), filed on Dec. 29, 2021.
Prior Publication US 2023/0209688 A1, Jun. 29, 2023
Int. Cl. H05B 47/14 (2020.01); G01R 19/00 (2006.01); H05B 45/3725 (2020.01)
CPC H05B 47/14 (2020.01) [G01R 19/0038 (2013.01); H05B 45/3725 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A full voltage sampling circuit, comprising:
a main sampling circuit configured to receive a first input voltage and a second input voltage, and configured to output a first sampling signal according to the first input voltage and the second input voltage, wherein the first sampling signal represents a differential voltage which indicates a difference between the first input voltage and the second input voltage;
an assist sampling circuit configured to receive the first input voltage and the second input voltage, and configured to output a second sampling signal according to the first input voltage and the second input voltage, wherein the second sampling signal represents the differential voltage; and
a processing circuit coupled to the main sampling circuit and the assist sampling circuit, and configured to select a larger one of currents or voltages of the first sampling signal and the second sampling signal as a sampling result to be outputted.