	US 12,015,305 B2
	Branch circuit emergency lighting transfer switch utilizing relay controls and safety relay for load power control
James Nourse, Eindhoven (NL); Tom Stoll, Eindhoven (NL); Madan Venn, Eindhoven (NL); and Mohammad Amini, Eindhoven (NL)
Assigned to SIGNIFY HOLDING, B.V., Eindhoven (NL)
Appl. No. 17/778,440
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Nov. 20, 2020, PCT No. PCT/EP2020/082824 § 371(c)(1), (2) Date May 20, 2022, PCT Pub. No. WO2021/099537, PCT Pub. Date May 27, 2021.
Claims priority of provisional application 63/022,763, filed on May 11, 2020.
Claims priority of provisional application 62/938,643, filed on Nov. 21, 2019.
Claims priority of application No. 20175957 (EP), filed on May 22, 2020.
Prior Publication US 2022/0416569 A1, Dec. 29, 2022
Int. Cl. H02J 9/06 (2006.01); H05B 47/105 (2020.01)

CPC H02J 9/065 (2013.01) [H05B 47/105 (2020.01)]

14 Claims

1. A method, comprising:

receiving a first monitoring signal indicating either one of an actuation of a fire alarm system or a first change of state in a primary power source from an on state to an off state, the on state comprising the primary power source providing a voltage sufficient to power a lighting load and the off state comprising the primary power source not providing a voltage sufficient to power the lighting load;

opening a first control relay connected to the primary power source and a second control relay connected to the secondary power source;

switching a safety relay from a first position, connecting the primary power source to power the lighting load, to a second position, connecting the secondary power source to power the lighting load; and

closing the first and second control relays.