Patent Application
20180320875
The present invention relates to a LED lighting apparatus, and more particularly, to a LED lighting apparatus having flame barriers.
Recently, there are rapidly increasing demands for a LED lighting apparatus of a high power and high efficiency. According to the demands, a direct input AC powered LED lighting continues to be developed and released.
Generally, in a direct input AC powered LED lighting, a flickering of LEDs occurs due to characteristics of AC drive circuit. To reduce or eliminate the flickering of LEDs, capacitors were connected to the LED drive circuit. U.S. Pat. No. 9,532,412 discloses an example of such a direct input AC powered LED lighting system.
According to disclosure of the US patent, capacitors as anti-flickers protrude from a front surface of the substrate of LED module as the capacitors are mounted on the substrate. The protrusion of capacitors from the front surface obstructs physical contact between the rear surface of the substrate and a heat-sink, and thus it results in diminishing the efficiency of heat dissipation at the heat sink. In addition, the protrusion of capacitors from the front surface of the substrate blocks light of LEDs and thus forms a dead zone or a shading zone behind the capacitors.
Recently, it requires that a lighting device on a ceiling should comply with ‘UL 5VA flammability Standard’. However, even though there were many trials to upgrade material of components, they fail to provide with substantially effective results.
It is an object of the present invention to provide a LED lighting apparatus capable of preventing from fire spreading via opening on the ceiling with a simple structure.
It is another object of the present invention is to provide a LED lighting apparatus which can meet ‘UL 5VA flammability Standard’ for various types of a LED light fixture.
It is also another object of the present invention is, in case that AC direct input LED lighting system includes anti-flickering component, such as a capacitor, to provide a LED lighting apparatus capable of preventing generation of shading due to anti-flicker components.
To accomplish the above-mentioned objects, the present invention comprises a LED module including a substrate having a front surface and a rear surface, and a plurality of LEDs mounted on the front surface of the substrate and driven by direct input of AC voltage; a heat sink to which the LED module is coupled for dissipating heat from the LEDs on the substrate of the LED module; a plurality of capacitors mounted on the substrate to eliminate flickering of the LEDs; a flame barrier plate being made of flame-retardant material and covering the front surface of the LED module so as to insulate the LED module from fire flame; and a plurality of capacitor flame barriers made of flame-retardant material and including a capacitor housing so as to receive and insulate the capacitor therein from fire flame.
The flame-retardant material as mentioned above may be ‘UL 94-5VA rated’ flame-retardant polycarbonate resin.
Each of the capacitors is displaced in the outside of beam angle of the LEDs so as not to shade beam of the LEDs. Further, each of the capacitor housings is disposed at the rear side of the substrate.
Furthermore, the capacitor housing is made integrally with the flame barrier plate.
The capacitor housings are displaced at the rear side of the substrate of the LED module, and each of the capacitor housing has an opening formed at the front side thereof. The opening is masked by a film-typed flame barrier which is made of flame-retardant material, such as ‘UL 94-5VA rated’ flame-retardant material.
An embodiment of the present invention comprises a LED module including a substrate having a front surface and a rear surface, and a plurality of LEDs mounted on the front surface of the substrate and driven by direct input of AC voltage; a plurality of capacitors disposed at the rear side of the substrate of the LED module in a lying position and connected to the LEDs to eliminate flickering of the LEDs; a heat sink detachably installed on a ceiling panel, including a base plate and a heat dissipating annular rim, wherein the heat dissipating annular rim is extended outwardly and circumferentially from the base plate, and wherein the base plate is attached to the LED module so as to dissipate heat from the LEDs; a flame barrier plate made of UL 94-5VA rated flame-retardant polycarbonate resin and covering the front surface of the substrate of the LED module so as to insulate the LED module from fire flame; a plurality of capacitor housings made of UL 94-5VA rated flame-retardant polycarbonate resin, wherein each of the capacitor housings has an opening formed at a front side and accommodates each capacitor so as to insulate the capacitor therein from fire flame; a film-typed flame barrier made of flame-retardant material and covering the opening of the capacitor housing; and a lens detachably coupled to the rim of the heat sink.
The base plate may include a plurality of through holes. This allows a rear portion of the capacitor housing to pass though so that it would not obstruct contact between the base plate and the rear surface of the substrate.
An another embodiment of the present invention comprises a LED module including a substrate having a front surface and a rear surface, and a plurality of LEDs mounted on the front surface of the substrate and driven by direct input of AC voltage; a plurality of capacitors disposed at the rear side of the substrate in an upright position, and the capacitors being connected to the LEDs so as to eliminate flickering of the LEDs; a heat sink including a base plate detachably coupled to the LED module to absorb heat from the LEDs on the substrate and a plurality of fins upright extended from the base plate to dissipate heat from the base plate; a flame barrier plate covering the front surface of the substrate of the LED module to insulate the LED module from fire flame and being made of UL 94-5VA rated flame-retardant polycarbonate resin, and having a central hole to allow the light beam of the LEDs to pass therethrough; a plurality of capacitor housings made of UL 94-5VA rated flame-retardant polycarbonate resin to enclose the capacitors, wherein each of the capacitor housings comprises a first wall extended upwardly from one side of the flame barrier plate and a second wall detachably coupled to the first wall; a reflector detachably coupled to a bottom surface of the heat sink plate to guide the light beam of the LEDs; and a can (housing) installed into a mounting hole of a ceiling panel.
The fins of the heat sink may make a room for receiving the capacitors between two central fins facing each other.
These and other features, aspects, and advantages of the present invention will become better understood with reference to the following description, appended claims, and accompanying drawings:
Hereinafter, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to
As shown in
As shown in
The flame barrier plate 30 is made of light-transmittable and flame-retardant material, and the flame barrier plate 30 covers the front surface 12 of the substrate 10 so as to insulate the LED module from fire flame. Preferably, the material of the flame barrier plate 30 may be ‘UL 94-5VA rated’ flame-retardant polycarbonate resin to meet ‘UL 5VA flammability Standard’. When the flame barrier plate 30 is assembled in the LED lighting apparatus 1, it can protect the LED module from fire flame and also it allows for downlighting.
As shown in
As the capacitor 20 is enclosed with the sidewall of the capacitor housing 31 and the opening 32 of the capacitor housing 31 is shield with the flame barrier film 40, the capacitor 20 is wholly covered and protected from fire flame.
Preferably, the flame barrier plate 30 and the capacitor housings 31 are formed integrally in one mould. In particular, the flame barrier plate 30 and the capacitor housings 31 are made of ‘UL 94-5VA rated’ flame-retardant polycarbonate resin to meet ‘UL 5VA flammability Standard’.
Referring to
A plurality of capacitors 120 are disposed at the rear side of the substrate 110 in an upright position, and further the capacitors 120 are connected to the LEDs 111 by lead wires 121 so as to eliminate flickering of the LEDs 111.
A heat sink 150 is detachably coupled to the LED module. The heat sink 150 includes a base plate 152 being in contact with the substrate 110 to absorb heat of the LEDs 111 on the substrate 110 and a plurality of fins 155 upright extended from the base plate 152 to dissipate heat from the base plate 152.
As shown in
There are on both sides of the flame barrier plate 130 provided a plurality of capacitor housings 135 to enclose the capacitors 120, respectively. Preferably, the capacitor housings 135 are made of UL 94-5VA rated flame-retardant polycarbonate resin so as to meet ‘UL 5VA flammability Standard’.
As shown in
As shown in
A reflector 170 is detachably coupled to a bottom 131 of the flame barrier plate 130 to guide the light beam of the LEDs. On the bottom 131, there are provided two of hooks 137 to engage with the reflector 170. A can (housing) 180 is detachably coupled to the heat sink 150 at the upper end and is installed into a mounting hole 2 of a ceiling panel 1 with bracket 3.
