US 11,871,487 B2
Portable lighting device
Li Zhang, Dongguan (CN); Hao Cui, Dongguan (CN); and DanJun Guo, Dongguan (CN)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jan. 6, 2023, as Appl. No. 18/151,086.
Application 18/151,086 is a continuation of application No. 16/689,359, filed on Nov. 20, 2019, granted, now 11,589,434.
Claims priority of application No. 201822007596.4 (CN), filed on Nov. 30, 2018.
Prior Publication US 2023/0142534 A1, May 11, 2023
Int. Cl. H05B 45/10 (2020.01); H05B 47/16 (2020.01); H05B 47/10 (2020.01); F21V 23/04 (2006.01); F21L 4/00 (2006.01); F21V 15/01 (2006.01); F21V 23/00 (2015.01); F21V 23/02 (2006.01); F21Y 115/10 (2016.01)
CPC H05B 45/10 (2020.01) [F21L 4/005 (2013.01); F21V 15/01 (2013.01); F21V 23/003 (2013.01); F21V 23/02 (2013.01); F21V 23/0414 (2013.01); H05B 47/10 (2020.01); H05B 47/16 (2020.01); F21Y 2115/10 (2016.08)] 17 Claims
OG exemplary drawing
 
1. A portable lighting device comprising:
a housing;
a light source supported by the housing;
an alkaline battery positioned within the housing and coupled to the light source, wherein the alkaline battery is configured to provide a drive current to the light source and an intensity of the light source is dependent on the drive current; and
an electronic processor positioned within the housing and coupled to the light source and the alkaline battery, wherein the electronic processor is configured to
monitor a voltage of the alkaline battery, and
execute a ramp-up algorithm to control the drive current based on the voltage of the alkaline battery, wherein the ramp-up algorithm is executed while the light source is outputting light;
wherein the electronic processor is configured to execute the ramp-up algorithm to:
determine that the alkaline battery is partially depleted; and
in response to determining that the alkaline battery is partially depleted, incrementally ramp-up the drive current provided to the light source from the alkaline battery to a high drive current for a high mode of operation for the light source instead of initially setting the drive current to the high drive current.