Linear solid-state lighting free of shock hazard
A linear light-emitting diode (LED)-based solid-state lamp having an electrically insulating heat sink that comprises a honeycomb structure is used to replace a conventional metallic one for efficiently dissipating the heat generated by operating the lamp. The lamp further built with a pair of shock protection switches can operate free of electric shock hazard.
1. A linear light-emitting diode (LED) lamp, comprising:
a housing having a honeycomb structure with a plurality of cells and having two ends;
a light-emitting diode printed circuit board (LED PCB) fixed on a surface of the housing between the two ends, 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, a bi-pin with two pins protruding outwards through the end face, and a shock protection switch connected with the bi-pin on the lamp base, wherein: when the bi-pin is inserted into a lamp socket, the shock protection switch is actuated to electrically connect the bi-pin with a respective one of the inputs of the LED driver; and when the shock protection switch is unactuated, the bi-pin is electrically disconnected from the respective input of the LED driver.
2. The linear LED lamp of claim 1 , wherein the LED PCB has a printed circuit to electrically conduct AC power from one of the shock protection switches to the LED driver.
3. The linear LED lamp of claim 1 , wherein the 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 respective input of the LED driver; 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 shock protection switch are electrically connected to actuate the shock protection switch so that the bi-pin is electrically connected with the respective input of the LED driver.
4. The linear LED lamp of claim 1 , wherein the shock protection switches are of a contact type.
5. The linear LED lamp of claim 4 , wherein the shock protection switches are each a snap switch, a push-button switch, rotary switch, or a micro switch.
6. The linear LED lamp of claim 1 , wherein the shock protection switches are of a non-contact type.
7. The linear LED lamp of claim 6 , wherein the shock protection switches are electro-mechanical, magnetic, optical, electro-optic, fiber-optic, infrared, or wireless based.
8. The linear LED lamp of claim 6 , wherein the shock protection switches have a proximity control or sensing range up to 8 mm.
9. The linear LED lamp of claim 1 , wherein the housing is made of an electrically insulating and thermally conductive material with thermal conductivity greater than or equal to 5.0 W/m° K.
10. The linear LED lamp of claim 1 , wherein the cells in the honeycomb structure are circular, elliptical, triangular, rectangular, trapezoidal, hexagonal, or polygonal.