US 11,672,073 B2
Lamp having a safety circuit, and a safety circuit for use in such lamps
Xiajuan Wu, Shanghai (CN); Dalibor Cvoric, Arnhem (NL); Ye Liu, Shanghai (CN); Haimin Tao, Eindhoven (NL); Yun Wang, Shanghai (CN); Han Lu, Eindhoven (NL); Jing Yang, Shanghai (CN); Deyong Kong, Shanghai (CN); and Jing Li, Eindhoven (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/417,173
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Dec. 17, 2019, PCT No. PCT/EP2019/085574
§ 371(c)(1), (2) Date Jun. 22, 2021,
PCT Pub. No. WO2020/141066, PCT Pub. Date Jul. 9, 2020.
Claims priority of application No. PCT/CN2019/070015 (WO), filed on Jan. 2, 2019; and application No. 19158737 (EP), filed on Feb. 22, 2019.
Prior Publication US 2022/0061142 A1, Feb. 24, 2022
Int. Cl. H05B 45/50 (2022.01); H05B 47/20 (2020.01); F21V 25/00 (2006.01); F21V 25/04 (2006.01)
CPC H05B 47/20 (2020.01) [F21V 25/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A system of multiple lamps, wherein each lamp comprises:
first and second electrical connection terminals for connection to an external power supply;
a light emitting circuit for powering by the external power supply; and
a safety circuit for safety testing being used within the lamp having the first and a second electrical connection terminals, wherein the safety circuit comprises a testing unit adapted to apply a test to detect when the first and second electrical connection terminals are both connected to the external power supply without an interfering impedance; and
an enabling unit to enable operation of the light emitting circuit of the lamp when the first and second electrical connection terminals are both detected as connected to the external power without the interfering impedance;
wherein the safety circuit further comprises a timing selection unit for selecting a time at which the test is applied such that the selected time is different from the time when another lamp in the system applies the test.