Linear solid-state lighting with a double safety mechanism free of shock hazard
A linear light-emitting diode (LED)-based solid-state lamp having a double safety mechanism that comprises at least three shock protection switches, fully protects a person from possible electric shock during re-lamping or maintenance. One protection switch provided at each end of the lamp is able to cut off power when the associated end of the lamp is not inserted into the lamp socket. A third protection switch can be used to turn off the power from the AC main for additional shock protection.
1. A linear light-emitting diode (LED) tube lamp, comprising:
a housing having two ends;
a light-emitting diode printed circuit board (LED PCB) fixed between the two ends of the housing, the LED PCB having a plurality of LEDs fixed thereon;
an LED driver that powers the plurality of LEDs on the LED PCB, the LED driver having two inputs;
two lamp bases respectively connected to the two ends of the housing, each lamp base comprising an end face and a bi-pin with two pins protruding outwards through the end face; and
a utility shock protection switch, wherein
when the utility shock protection switch is actuated, the two bi-pins are electrically connected with the two inputs of the LED driver, respectively, and
when the utility shock protection switch is unactuated, the two bi-pins are electrically disconnected from the two inputs of the LED driver.
2. The linear LED tube lamp of claim 1 , wherein the utility shock protection switch comprises:
two pairs of electrical contacts, each pair comprising a first electrical contact connected to the bi-pin of one of the lamp bases and a second electrical contact connected to one of the two inputs of the LED driver; and
a switch actuation mechanism, wherein when the switch actuation mechanism is actuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are connected to actuate the utility shock protection switch so that the two bi-pins are respectively connected with the two inputs of the LED driver, and when the switch actuation mechanism is unactuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are disconnected to unactuate the utility shock protection switch.
3. The linear LED tube lamp of claim 1 , wherein the utility shock protection switch is of a contact type.
4. The linear LED tube lamp of claim 3 , wherein the utility shock protection switch is a rocker switch, a toggle switch, a push-button switch, or a micro switch.
5. The linear LED tube lamp of claim 1 , wherein the utility shock protection switch is of a non-contact type.
6. The linear LED tube lamp of claim 5 , wherein the utility shock protection switch is electro-mechanical, magnetic, optical, electro-optic, fiber-optic, infrared, or wireless based.
7. A linear light-emitting diode (LED) tube lamp, comprising:
a housing having two ends;
a light-emitting diode printed circuit board (LED PCB) fixed between the two ends of the housing, the LED PCB having a plurality of LEDs fixed thereon;
an LED driver that powers the plurality of LEDs on the LED PCB, the LED driver having two inputs;
a utility shock protection switch; and
two lamp bases respectively connected to the two ends of the housing, each lamp base comprising an end face, a bi-pin with two pins protruding outwards through the end face, and an end shock protection switch connected with the utility shock protection switch, wherein: when the bi-pin is inserted into a lamp socket, the end shock protection switch is actuated to electrically connect the bi-pin with the utility shock protection switch; when the end shock protection switch is unactuated, the bi-pin is electrically disconnected from the utility shock protection switch,
wherein when the utility shock protection switch is actuated, the two end shock protection switches are electrically connected with the two inputs of the LED driver, respectively, and
when the utility shock protection switch is unactuated, the two end shock protection switches are electrically disconnected from the two inputs of the LED driver,
and wherein the two bi-pins are respectively connected with the two inputs of the LED driver only if the two end shock protection switches and the utility shock protection switch are actuated.
8. The linear LED tube lamp of claim 7 , wherein the end shock protection switch of each of the two lamp bases comprises:
two electrical contacts, one electrically connected with the bi-pin of the respective lamp base, and the other electrically connected with the utility shock protection switch; and
a switch actuation mechanism having a front portion protruding outwards through the end face of the respective lamp base, wherein when the front portion of the switch actuation mechanism is pressed in by inserting the bi-pin of the lamp base into a lamp socket, the two electrical contacts of the end shock protection switch are electrically connected to actuate the end shock protection switch so that the bi-pin is electrically connected with the utility shock protection switch.
9. The linear LED tube lamp of claim 8 , wherein the utility shock protection switch comprises:
two pairs of electrical contacts, each pair comprising a first electrical contact connected to the end shock protection switch of one of the lamp bases and a second electrical contact connected to one of the two inputs of the LED driver; and
a utility switch actuation mechanism, wherein when the utility switch actuation mechanism is actuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are connected to actuate the utility shock protection switch so that the two end shock protection switches are respectively connected with the two inputs of the LED driver, and when the utility switch actuation mechanism is unactuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are disconnected to unactuate the utility shock protection switch.
10. The linear LED tube lamp of claim 7 , wherein the utility shock protection switch comprises:
two pairs of electrical contacts, each pair comprising a first electrical contact connected to the end shock protection switch of one of the lamp bases and a second electrical contact connected to one of the two inputs of the LED driver; and
a utility switch actuation mechanism, wherein when the utility switch actuation mechanism is actuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are connected to actuate the utility shock protection switch so that the two end shock protection switches are respectively connected with the two inputs of the LED driver, and when the utility switch actuation mechanism is unactuated, the first electrical contact and the second electrical contact of each pair of electrical contacts are disconnected to unactuate the utility shock protection switch.
11. The linear LED tube lamp of claim 7 , wherein the end shock protection switches and/or the utility shock protection switch are of a contact type.
12. The linear LED tube lamp of claim 11 , wherein the end shock protection switches are each a snap switch, a push-button switch, or a micro switch.
13. The linear LED tube lamp of claim 11 , wherein the utility shock protection switch is a rocker switch, a toggle switch, a push-button switch, or a micro switch.
14. The linear LED tube lamp of claim 7 , wherein the end shock protection switches and/or the utility shock protection switch are of a non-contact type.
15. The linear LED tube lamp of claim 14 , wherein the end shock protection switches and the utility shock protection switch are electro-mechanical, magnetic, optical, electro-optic, fiber-optic, infrared, or wireless based.
16. The linear LED tube lamp of claim 14 , wherein the end shock protection switches have a proximity control or sensing range up to 8 mm.