Light-emitting diode lamps with battery backup user interfaces
An LED lamp includes an elongated housing, LED arrays, a rechargeable battery, a controller circuit, two drivers, a charging circuit, and a battery backup user interface. The first driver converts an external power to drive the LED array whereas the second driver draws power from the rechargeable battery to drive the LED arrays during power outage. The charging circuit charges the rechargeable battery during normal operation. The battery backup user interface includes a battery charging indicator indicating the charging status of the rechargeable battery. The battery backup user interface also includes a battery shutoff switch configured to allow a user to enable or disable the rechargeable battery. In some cases, the battery backup user interface further includes a test button configured to allow the user to trigger a test of the rechargeable battery.
1. A light-emitting diode (LED) lamp, comprising:
an elongated housing;
one or more LED arrays, facing a first direction;
a rechargeable battery;
a controller circuit;
a first driver configured to convert a first external power to a first internal power to drive the one or more LED arrays in a normal mode;
a charging circuit configured to convert a second external power to a second internal power to charge the rechargeable battery;
a second driver configured to draw a third internal power from the rechargeable battery and to convert the third internal power to a fourth internal power to drive the one or more LED arrays in an emergency mode; and
a user interface section disposed on an opaque portion of the elongated housing and facing the first direction,
wherein:
a portion of the elongated housing comprises either a translucent or a transparent lens to allow a light emitted from the one or more LED arrays to shine through;
the charging circuit comprises a first battery protection circuit configured to monitor a charging condition and to automatically disable the second internal power to the rechargeable battery, thereby preventing the rechargeable battery from being overcharged or creating a fire hazard;
when the second external power is detected, the controller circuit is configured to operate the one or more LED arrays in the normal mode by (1) enabling the charging circuit to charge the rechargeable battery, (2) disabling the second driver to draw the third internal power from the rechargeable battery, and (3) enabling the first driver to supply the first internal power to light up the one or more LED arrays;
when the second external power is not detected, the controller circuit is configured to operate the one or more LED arrays in the emergency mode by enabling the second driver to draw the third internal power from the rechargeable battery and to supply the fourth internal power to light up the one or more LED arrays; and
the user interface section comprises:
a first indicator configured to indicate whether the rechargeable battery is being charged or not; and
a battery shutoff mechanism configured to disable the rechargeable battery to provide the third internal power to the second driver.
2. The light-emitting diode (LED) lamp of claim 1 , wherein each of the first external power and the second external power comprises a non-switched power source.
3. The light-emitting diode (LED) lamp of claim 2 , wherein the non-switched power source is connected to a pair of electrical contacts extruding out of one end of the elongated housing.
4. The light-emitting diode (LED) lamp of claim 2 , wherein the non-switched power source is connected between a first pair of electrical contacts extruding out of one end of the elongated housing and a second pair of electrical contacts extruding out of an opposite end of the elongated housing.
5. The light-emitting diode (LED) lamp of claim 1 , wherein the first external power is a switched power source connected to a first pair of electrical contacts extruding out of one end of the elongated housing, and wherein the second external power is a non-switched external power source connected to a second pair of electrical contacts extruding out of an opposite end of the elongated housing.
6. The light-emitting diode (LED) lamp of claim 1 , wherein the user interface section further comprises a second indicator configured to indicate whether the rechargeable battery is fully charged or not.
7. The light-emitting diode (LED) lamp of claim 6 , wherein the second indicator is a logical type and integrated in the first indicator.
8. The light-emitting diode (LED) lamp of claim 1 , wherein the battery shutoff mechanism comprises a mechanical switch, and wherein, when the mechanical shutoff switch is turned off, an electrical connection between the rechargeable battery and the second driver is turned off.
9. The light-emitting diode (LED) lamp of claim 1 , wherein the battery shutoff mechanism comprises a first signaling device, and wherein, when the first signaling device is triggered by a user, an electrical connection between the rechargeable battery and the second driver is turned off.
10. The light-emitting diode (LED) lamp of claim 9 , wherein the first signaling device is configured to generate one or more electrical pulses in response to triggering by the user.
11. The light-emitting diode (LED) lamp of claim 10 , wherein the user interface section further comprises a second signaling device configured to signal the controller circuit to perform a battery test for a predefined period.
12. The light-emitting diode (LED) lamp of claim 1 , wherein the first battery protection circuit is configured to continuously monitor a charging voltage and a charging current and to feed the charging voltage and the charging current to the controller circuit via a first link, and wherein the charging circuit is controlled by the controller circuit via a second link.
13. The light-emitting diode (LED) lamp of claim 1 , wherein the user interface section is further configured to turn off the first internal power, and wherein the battery shutoff mechanism further functions as a main switch.
14. The light-emitting diode (LED) lamp of claim 10 , wherein the user interface section further comprises an interface device, and wherein the second driver is turned off by the controller circuit via the interface device.
15. The light-emitting diode (LED) lamp of claim 14 , wherein the interface device is an electronic switch controllable by the controller circuit via a fourth link.
16. The light-emitting diode (LED) lamp of claim 1 , wherein:
the LED lamp further comprises a voltage sensing circuit configured to sense a terminal voltage of the rechargeable battery; and
the user interface section further comprises a test button and a third indicator,
wherein:
when the test button is depressed, the controller circuit is configured to operate the one or more LED arrays in a battery test mode for a first predefined period by: (1) disabling the first driver to supply the first internal power to the one or more LED arrays, (2) disabling the charging circuit to provide the second internal power to the rechargeable battery, (3) enabling the second driver to draw the third internal power from the rechargeable battery, (4) enabling the second driver to supply the fourth internal power to light up the one or more LED arrays, and (5) sampling a portion of the terminal voltage of the rechargeable battery via the voltage sensing circuit; and
in an event that the terminal voltage of the rechargeable battery drops below a predefined percentage relative to a nominal voltage during the battery test mode, the controller circuit is configured to set off the third indicator to indicate the battery test having failed exit out of the battery test mode, and resume an operation in the normal mode.
17. The light-emitting diode (LED) lamp of claim 16 , wherein the user interface section further comprises a fourth indicator configured to indicate that the one or more LED arrays are operated in the battery test mode.
18. The light-emitting diode (LED) lamp of claim 16 , wherein the controller circuit further comprises a memory portion configured to store a result from a most recent battery test.
19. The light-emitting diode (LED) lamp of claim 16 , wherein the controller circuit is further configured to perform the battery test periodically and automatically according to at least one predefined schedule and an internal clock in the controller circuit.
20. The light-emitting diode (LED) lamp of 19 , wherein the controller circuit further comprises a reset mechanism to reset a starting time of the at least one predefined schedule.
21. The light-emitting diode (LED) lamp of claim 16 , further comprising a network interface portion configured to operate in conjunction with the controller circuit to (1) report a result from a most recent battery test to either a remote device or a remote system, or (2) receive and execute a battery test request from either the remote device or the remote system and report the result from the most recent battery test back to the remote device or the remote system, or (3) perform both (1) and (2).
22. The light-emitting diode (LED) lamp of claim 21 , wherein the network interface portion is configured to communicate with either the remote device or the remote system via a wireless communication comprising Wi-Fi, Bluetooth, infrared (IR), or visible light communication (VLC).
23. The light-emitting diode (LED) lamp of claim 21 , wherein the network interface portion is configured to communicate with either the remote device or the remote system via a wired communication comprising Power over Ethernet (POE).
24. The light-emitting diode (LED) lamp of claim 16 , wherein the controller circuit further comprises a second battery protection circuit configured to automatically disable the third internal power to convert into the fourth internal power to drive the one or more LED arrays, thereby preventing the rechargeable battery from being over-discharged.