US Patent 10492265 Solid-state lighting with a control gear cascaded by a luminaire

A light-emitting diode (LED) lighting system comprising a luminaire and an LED luminaire control gear is used to replace the luminaire operated with alternate-current (AC) mains. The luminaire coupled to the LED luminaire control gear comprises LED arrays and a power supply. The LED luminaire control gear comprises a rechargeable battery, a current-fed inverter, and a relay switch. When a line voltage from the AC mains is unavailable, the LED luminaire control gear is automatically started to provide a high output voltage within an input operating voltage range of the luminaire and a low direct-current (DC) voltage to control the power supply to provide an LED driving voltage greater than a forward voltage across the LED arrays, eliminating operating instability of the power supply. The relay switch is configured to couple either the line voltage or the high output voltage to the power supply to operate thereon.