A light-emitting diode (LED) luminaire, comprising:
- at least four electrical conductors configured to couple to alternate-current (AC) mains;
- one or more LED arrays with a forward voltage across the one or more LED arrays;
- a rechargeable battery;
- a first full-wave rectifier and at least one second full-wave rectifier coupled to the at least four electrical conductors and configured to respectively convert a line voltage from the AC mains into a first direct-current (DC) voltage and a second DC voltage;
- a first input filter and a second input filter respectively coupled to the first full-wave rectifier and the at least one second full-wave rectifier, the first input filter and the second input filter configured to suppress an electromagnetic interference (EMI) noise;
- a charging circuit comprising a first transformer and a first ground reference, the charging circuit coupled to the first full-wave rectifier via the first input filter and configured to convert the first DC voltage into a third DC voltage that charges the rechargeable battery to reach a fourth DC voltage;
- a first driver comprising a switch, a dimming controllable device, the first ground reference, an input inductor, at least one diode connected in series with the input inductor, an output resistor, and an output capacitor connected in parallel with the output resistor and connected between the at least one diode and the first ground reference, the first driver configured to convert the fourth DC voltage into a fifth DC voltage to power the one or more LED arrays when the line voltage from the AC mains is unavailable;
- a second driver comprising a second transformer, a power sustaining device, and a second ground reference, the second driver coupled to the at least one second full-wave rectifier via the second input filter, the second driver configured to convert the second DC voltage into a sixth DC voltage that powers the one or more LED arrays at full power to meet LED luminaire efficacy requirements when the power sustaining device is enabled to reach an operating voltage to operate the second driver;
- and
- a test and voltage pull-down circuit comprising a voltage pull-down circuit comprising a first voltage pull-down circuit and a second voltage pull-down circuit, the first voltage pull-down circuit configured to either pull down a dimming voltage coupled to the dimming controllable device to disable the first driver when the line voltage from the AC mains is available or to pull up the dimming voltage coupled to the dimming controllable device to enable the first driver when the line voltage from the AC mains is unavailable,
- wherein:
- the charging circuit, the first driver, the second driver, and the test and voltage pull-down circuit are configured to auto-select either the fifth DC voltage or the sixth DC voltage to operate the one or more LED arrays;
- and
- when a rechargeable battery test is performed, the first driver is enabled to operate the one or more LED arrays, whereas the second driver is inactivated.