US 12,446,130 B2
System-on-chip SoC and smoke detection device comprising the same
Zhanlin Yang, Qinhuangdao (CN); Haiyong Lu, Qinhuangdao (CN); Maoqing Yang, Qinhuangdao (CN); Hongliang Lei, Qinhuangdao (CN); Jie Xi, Shanghai (CN); and Benliang Li, Qinhuangdao (CN)
Assigned to KIDDE FIRE PROTECTION, LLC, Bradenton, FL (US)
Filed by Kidde Fire Protection, LLC, Bradenton, FL (US)
Filed on Sep. 13, 2023, as Appl. No. 18/466,131.
Claims priority of application No. 202211127466.9 (CN), filed on Sep. 16, 2022.
Prior Publication US 2024/0098857 A1, Mar. 21, 2024
Int. Cl. H05B 45/30 (2020.01); G08B 17/103 (2006.01); H05B 45/345 (2020.01); H05B 45/56 (2020.01)
CPC H05B 45/345 (2020.01) [G08B 17/103 (2013.01); H05B 45/56 (2020.01)] 9 Claims
OG exemplary drawing
 
1. A system-on-chip (SoC) comprising:
a power regulating input port;
a light-emitting diode LED driving circuit coupled with the power regulating input port, wherein the light-emitting diode LED driving circuit is used to provide a constant current output, and wherein the light-emitting diode LED driving circuit comprises an adjustable resistor, so that the constant current output changes with a change in resistance value of the adjustable resistor;
a voltage divider protection circuit; and
a constant current circuit, which is coupled with the power regulating input port via the voltage divider protection circuit and regulates the constant current output according to a signal from the power regulating input port;
wherein the constant current circuit comprises a triode, wherein a base of the triode is coupled with the voltage divider protection circuit, an emitter of the triode is grounded via the adjustable resistor, and a collector of the triode is coupled with a light-emitting diode.