US Patent No. 10,485,073

SOLID-STATE LIGHTING WITH DUAL MODE OPERATIONS


Patent No. 10,485,073
Issue Date November 19, 2019
Title Solid-state Lighting With Dual Mode Operations
Inventorship Chungho Hsia, Bellevue, WA (US)
Assignee ALEDDRA INC., Renton, WA (US)

Claim of US Patent No. 10,485,073

1. A luminaire power pack, comprising:at least two electrical conductors configured to couple to alternate-current (AC) mains;
a rechargeable battery;
at least one full-wave rectifier coupled to the at least two electrical conductors and configured to convert a line voltage from the AC mains into a first direct-current (DC) voltage;
at least one input filter coupled to the at least one full-wave rectifier, the at least one input filter configured to suppress an electromagnetic interference (EMI) noise;
a charging circuit comprising a control device, a first transformer, a first ground reference, and a second ground reference electrically isolated from the first ground reference, the charging circuit coupled to the at least one full-wave rectifier via the at least one input filter and configured to convert the first DC voltage into a second DC voltage that charges a voltage level of the rechargeable battery to reach a third DC voltage;
a light-emitting diode (LED) driving circuit comprising a step-up converter and the second ground reference, the LED driving circuit configured to receive the third DC voltage from the rechargeable battery and to convert the third DC voltage into a fourth AC or DC voltage when the line voltage from the AC mains is unavailable; and
a line voltage detection and control circuit comprising a self-diagnostic circuit and a relay switch, the line voltage detection and control circuit configured to enable or disable the LED driving circuit according to availability of the AC mains, and the relay switch comprising a power sensing coil with a pick-up voltage,
wherein:
the self-diagnostic circuit comprises multiple timers, wherein each of the multiple timers respectively comprises a first time delay and a second time delay, wherein upon application of the third DC voltage to the self-diagnostic circuit, the first time delay in each of the multiple timers begins, wherein at an end of the first time delay an output of the self-diagnostic circuit is energized and remains energized so as to activate the LED driving circuit for the second time delay in each of the multiple timers, wherein at an end of the second time delay in each of the multiple timers the output of the self-diagnostic circuit is de-energized, wherein the first time delay and the second time delay in each of the multiple timers form a sequence, and wherein the sequence repeats until the third DC voltage is removed from the self-diagnostic circuit;
the relay switch further comprises a first pair of input electrical terminals, a second pair of input electrical terminals, and a third pair of input electrical terminals, and wherein the third pair of input electrical terminals are configured to receive the pick-up voltage to operate the power sensing coil; and
the relay switch further comprises a pair of output electrical terminals configured to relay either a first input voltage appeared at the first pair of input electrical terminals or the fourth AC or DC voltage appeared at the second pair of input electrical terminals to the pair of output electrical terminals when the relay switch is activated.