US Patent No. 10,660,184

SOLID-STATE LIGHTING WITH MULTIPLE TIME DELAYS


Patent No. 10,660,184
Issue Date May 19, 2020
Title Solid-state Lighting With Multiple Time Delays
Inventorship Chungho Hsia, Bellevue, WA (US)
Assignee ALEDDRA INC., Renton, WA (US)

Claim of US Patent No. 10,660,184

1. A light-emitting diode (LED) luminaire, comprising:at least two electrical conductors configured to couple to alternate-current (AC) mains;
one or more LED arrays with a forward voltage across thereon;
a rechargeable battery with a terminal voltage across thereon;
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 the terminal voltage of the rechargeable battery to reach a third DC voltage;
an LED driving circuit comprising an input inductor, an electronic switch, at least one diode rectifier, and an output capacitor connected between the at least one diode rectifier and the second ground reference, the LED driving circuit configured to convert the third DC voltage from the rechargeable battery into a fourth DC voltage to light up the one or more LED arrays when the line voltage from the AC mains is unavailable;
a power supply unit comprising a main transformer, the power supply unit configured to generate a main DC voltage to power up the one or more LED arrays at full power and to meet LED luminaire efficacy requirements when the line voltage from the AC mains is available; and
a control and test circuit comprising a self-diagnostic circuit and a charging detection and control circuit, wherein the control and test circuit is configured to enable or disable the LED driving circuit and the power supply unit according to availability of the AC mains and whether a rechargeable battery test is initiated, and wherein the self-diagnostic circuit comprises a test portion operated when the rechargeable battery test is initiated,
wherein:
the charging circuit, the LED driving circuit, the power supply unit, and the control and test circuit are configured to auto-select either the main DC voltage or the fourth DC voltage to operate the one or more LED arrays; and
the self-diagnostic circuit further comprises one or more timers, wherein each of the one or more timers respectively comprises multiple time delays, wherein the multiple time delays of each of the one or more timers respectively comprise at least one initial time delay and a next time delay immediately following the at least one initial time delay, wherein, upon an initiation of each of the one or more timers, the at least one initial time delay begins with an input voltage applied, wherein, at an end of the at least one initial time delay, an output of the self-diagnostic circuit is activated to reach a logic high level and remains activated so as to enable the LED driving circuit and the test portion for the next time delay, wherein, at an end of the next time delay, the output of the self-diagnostic circuit is inactivated to drop to a logic low level, wherein the at least one initial time delay and the next time delay form a primary sequence that repeats, and wherein a duration over the next time delay is configured to allow the self-diagnostic circuit to perform the rechargeable battery test.