1. A light-emitting diode (LED) luminaire control gear, comprising:a rechargeable battery comprising a high-potential electrode and a low-potential electrode with a terminal voltage across thereon;
at least one full-wave rectifier configured to be coupled to alternate-current (AC) mains to convert a line voltage from the AC mains into a first direct-current (DC) voltage;
a battery charging circuit comprising a first transformer, a first control device, a first electronic switch, a first ground reference, a second ground reference electrically isolated from the first ground reference, and a galvanic isolation circuit coupled to both the first ground reference and the second ground reference, wherein the battery charging circuit is configured to be coupled to the at least one full-wave rectifier to convert the first DC voltage into a second DC voltage that charges the rechargeable battery to reach the terminal voltage, and wherein the galvanic isolation circuit is configured to couple the second DC voltage to the first control device in response to various charging voltage and current requirements;
a current-fed converter circuit comprising a rectifier, at least one capacitor, and an inductor comprising a tap, wherein the tap is configured to divide the inductor into a first sub-inductor and a second sub-inductor, wherein the first sub-inductor is configured to couple to the terminal voltage, wherein the second sub-inductor is configured to magnetically couple to the first sub-inductor, wherein the inductor is configured to generate energy pulses that have a first voltage potential compatible to a first voltage in an input operating voltage range of an external power supply unit, wherein the rectifier is coupled to the second sub-inductor, and wherein the rectifier and the at least one capacitor are configured to convert the energy pulses into a third DC voltage when the current-fed converter circuit is enabled; and
a control and test circuit comprising a relay switch, wherein the control and test circuit is configured to enable or disable the current-fed converter circuit, and wherein the relay switch comprises a power sensing coil with a pick-up voltage and is configured to couple either the third DC voltage or the line voltage from the AC mains to the external power supply unit to operate thereon, subsequently powering up external one or more LED arrays coupled with the external power supply unit,
the relay switch further comprises a first input electrical terminal, a second input electrical terminal, and a pair of input electrical terminals, wherein the first input electrical terminal is configured to couple to a hot wire of the line voltage from the AC mains, wherein the second input electrical terminal is configured to couple to a high-potential lead wire of the third DC voltage, and wherein the 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 an output electrical terminal configured to relay either the hot wire of the line voltage from the AC mains or the high-potential lead wire of the third DC voltage to the external power supply unit to operate thereon.