KR20110120060A - Light emitting diode downlight - Google Patents

Abstract

PURPOSE: A light emitting diode downlight is provided to directly receive AC power from an AC power unit to drive an LED array, thereby minimizing the volume of the light emitting diode downlight. CONSTITUTION: A fuse(112) cuts excessive currents off wherein the excessive currents are inputted from an AC power input terminal. A sub temperature coefficient temperature sensor(113) controls rush currents which are inputted from the AC power input terminal. A varistor(114) is connected to the AC power input terminal in parallel to cut excessive currents off. A bridge rectifier rectifies AC power inputted from the AC power input terminal. An excessive voltage suppressing device(116) suppresses an excessive voltage.

Description

LED downlight {Light Emitting Diode DownLight}

The present invention relates to an LED downlight embedded or attached to an indoor ceiling, and more particularly, has a minimum volume and a beautiful and elegant appearance, extends life, minimizes the number of devices, and provides a sensor. By controlling the driving of the LED array to minimize the power consumption, and to configure a high power factor circuit portion, and easy to assemble and disassemble the LED downlight.

Recently, in order to solve the problems of high power consumption and short lifespan of halogen lamps or incandescent lamps, indoor luminaires using LEDs have been widely used.

Lighting fixtures employing conventional LEDs, such as LED downlights, include a circuit portion for driving the LED array, an enclosure case in which the circuit portion is built-in and fixed to the ceiling, and is coupled with the enclosure case and diffuses light from the LED array to the outside. It consists of a lens cover is formed a lens.

However, the LED downlight of the above-described configuration is difficult to optimize the volume of the LED downlight as an indoor lamp because the LED array is driven by receiving AC power using a switching mode power supply (SMPS), and the LED array is used because it uses an electrolytic capacitor. The life of the circuit part that drives the circuit is remarkably short, and the circuit part consisting of only the capacitor and the resistor can not constitute a high power factor circuit part, so the power consumption is considerably high, and the assembly time and the disassembly of the enclosure case and the lens cover are not easy to manufacture. This is long and there is a problem that the repair and replacement of the internal components is not easy.

Therefore, the development and research of the LED downlight having a circuit unit for driving the LED array that can solve the above problems is required.

The object of the present invention is to have a minimum volume and beautiful and elegant appearance, to extend the lifespan, to minimize the number of devices, to control the driving of the LED array by the sensor to minimize the power consumption, high power factor The circuit part of the present invention is to provide an LED downlight that is easy to assemble and disassemble.

According to a feature of the present invention for achieving the above object, the present invention, in the LED downlight having a circuit unit for driving at least one LED array by converting the AC power input to the AC power input terminal into a DC power source A fuse for blocking an overcurrent input to the AC power input terminal, a negative temperature coefficient temperature sensing sensor for limiting an inrush current input to the AC power input terminal, a varistor connected to the AC power input terminal in parallel and blocking an overvoltage; A bridge rectifier for full-wave rectifying the AC power input to the AC power input terminal, a transient voltage suppression element for suppressing a transient voltage converted into DC power through the bridge rectifier, and connected to the anode and cathode of the bridge rectifier, To the power rectified by the bridge rectifier A capacitor for removing the included ripple noise, a resistor connected in series with the capacitor and distributing a voltage of a DC power source from which the ripple noise is removed by the capacitor, and connected in series with the resistor and supplying a constant current to the LED array. Provided is an LED downlight having a circuit portion comprising at least two constant current diodes.

In the LED downlight according to the present invention, a dimming sensor connected to the output terminal of the LED array to sense the ambient brightness, a human body sensing sensor connected to the output terminal of the LED array to sense a user of the peripheral area, the at least one The LED device may further include a switching device connected in series with a cathode of a final stage of the LED array to control the LED array on-off by a current sensed by the dimming sensor and the human body sensor.

In the LED downlight according to the present invention, the lower surface is formed in an open cylindrical shape, the circuit portion is fixed to the internal space, a plurality of heat dissipation holes are formed on the side, the circuit portion and the upper surface of the enclosure case A heat dissipation adhesive interposed therebetween to disperse and fix the circuit portion to the upper surface of the enclosure case, and to dissipate heat generated when the LED array of the circuit portion is driven to the outside, and to diffuse light from the LED array of the circuit portion to the outside A lens cover which is formed in a cylindrical shape with an open lens and an upper surface and a lower surface to be irradiated, is formed to be opposed to the enclosure case, and a seating portion and a plurality of lens fixing pieces protruding inwardly to fix the lens in an inner space. It may include.

In the LED downlight according to the present invention, a plurality of fixing holes are formed on an upper surface of the enclosure case, and through holes corresponding to the fixing holes are formed in the circuit part and the heat dissipating adhesive, respectively, the through holes and the fixing. By a ceiling fixing member consisting of a bolt penetrating a hole and a nut coupled to one end of the bolt, a rim extending outward is formed at the outer periphery of the lower end of the lens cover or fixed to the ceiling. The rim and the spring by a fixing member which is formed in the side of the enclosure case protruding facing the projection pin, a spring elastically fixed to the spring fixing pin, and a locking projection coupled to both ends of the spring, Pressing the ceiling interposed between the engaging projection by the elastic force of the spring Groups may purchase fixed to the ceiling of the enclosure case.

In the LED downlight according to the present invention, a coupling groove curved inwardly is formed on a side of the lens cover, and a leaf spring having a shape corresponding to the coupling groove of the lens cover is fixedly formed on the inner circumferential edge of the enclosure case. Thus, the enclosure case and the lens cover can be elastically coupled by the leaf spring.

According to the present invention as described above, it is possible to drive the LED array by receiving the AC power directly from the AC power source, without using SMPS, so that the volume of the LED downlight can be minimized, to have a beautiful and elegant appearance It can work.

In addition, the present invention can extend the life of the circuit portion by not using an electrolytic capacitor, and has an effect of significantly reducing the number of devices constituting the circuit portion, thereby reducing the manufacturing cost.

In addition, the present invention has the effect of minimizing power consumption by configuring a high power factor circuit portion.

In addition, the dimming sensor and the human body sensor, by controlling the driving of the LED array can minimize the power consumption, there is an effect that can provide convenience to the user.

Furthermore, the present invention is that the leaf spring is elastically coupled to the engaging groove of the lens cover, the assembly and disassembly of the enclosure case and the lens cover can be simplified to shorten the manufacturing time, and easy to repair and replace the internal components It can be effective.

1 is a schematic exploded perspective view of an LED downlight according to the present invention.
FIG. 2 is a schematic cross-sectional view of the LED downlight of FIG. 1.
3 is an exemplary view illustrating an enlarged ceiling recessed fixing member and a leaf spring of the LED downlight of FIG. 1.
FIG. 4 is a circuit diagram of a circuit unit of the LED downlight of FIG. 1.

Specific details of other embodiments are included in the detailed description and drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments may be used in various embodiments that fall within the protection scope of the present invention. The present invention is merely an example provided to fully inform the person skilled in the art the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for describing the LED downlight 100 according to a preferred embodiment of the present invention.

Figure 1 is a schematic exploded perspective view of the LED downlight according to the present invention, Figure 2 is a schematic cross-sectional configuration of the LED downlight of Figure 1, Figure 3 is a ceiling embedded fixing member and plate of the LED downlight of Figure 1 4 is an enlarged view illustrating a spring, and FIG. 4 is a circuit diagram of a circuit unit of the LED downlight of FIG. 1.

1 to 4, the LED downlight 100 according to the present invention includes a circuit part 110 for driving an LED array 119 for irradiating light and an enclosure case 120 in which the circuit part 110 is installed. ), A heat dissipation adhesive 130 for fixing the circuit unit 110 to the enclosure case 120, a lens 140 for diffusing light emitted from the LED array 119, and a lens cover for fixing the lens 140. And 150.

First, the circuit unit 110 converts AC power input from the external AC power supply unit 10 into the AC power input terminal 111 to DC power and finally drives the LED array 119 to light the LED array 119. Investigate outside.

Specifically, referring to FIG. 4, the circuit unit 110 is electrically connected in series with an AC power input terminal 111 that receives AC power from the AC power supply unit 10, and receives an overcurrent input to the AC power input terminal 111. Negative Temperature Coefficient (NTC) that is electrically connected in series with the fuse 112 to cut off and the AC power input terminal 111 to limit the inrush current input to the AC power input terminal 111. Coefficient propagates AC power input to the temperature compensation resistor (thermister) 113, the varistor 114 electrically connected in parallel to the AC power input terminal 111, and overvoltage blocking, and the AC power input terminal 111 A rectifying bridge rectifier 115, a transient voltage suppressor (TVS) 116 for suppressing a transient voltage which is converted into a DC power through the bridge rectifier 115 and outputted, and a bridge rectifier ( A capacitor electrically connected to the anode 115-1 and the cathode 115-2 of 115 to remove ripple noise of the power source rectified by the bridge rectifier 115; a resistor (R) electrically connected in series with the smoothing capacitor 117 and the noise removing capacitor 117 and distributing the voltage of the DC power stabilized by the noise removing capacitor 117 at a constant ratio, and a resistance; (R) is connected in series and consists of at least two or more constant current diode (CRD; Current Regurative Diode) (118) for supplying a constant current to the LED array (119).

Here, the negative temperature coefficient temperature compensation resistance 113 is relatively large when the AC power is input from the AC power supply unit 10 due to the characteristic that the resistance value increases at a temperature lower than a specific temperature and the resistance value decreases at a temperature higher than a specific temperature. The inrush current is limited by the resistance of the negative temperature coefficient temperature compensation resistor 113. In addition, the varistor 114 blocks a surge voltage, thereby preventing damage or malfunction of the circuit unit 110 due to the surge voltage. In the transient voltage suppression element 116, when a transient voltage is generated due to a transient phenomenon, the impedance of the transient voltage suppression element 116 is lowered, so that the transient voltage is diverted to the transient voltage suppression element 116. In addition, the transient voltage is limited to a stable constant voltage clamping voltage. In addition, the constant current diode 118 supplies a constant current to the LED array 119 in the form of a pulse irrespective of the input voltage or the load, and replaces the constant current diode so that a transistor (TR) or a field effect transistor (FET) It can be applied for constant current supply to 119. In addition, the LED array 119 is formed by at least one electrically connected in series, each LED array 119 may be composed of at least one LED.

On the other hand, the above-described circuit unit 110, the dimming sensor 161 is electrically connected to the output terminal of the LED array 119 and detects the ambient brightness, and electrically connected to the output terminal of the LED array 119, the user of the peripheral area The human body sensor 162 for detecting the LED, and electrically connected in series to the cathode of the last end of the at least one LED array 119, the LED by the current sensed by the dimming sensor 161 and the human body sensor 162 The switching element 163 may further include an on-off control of the array 119. For example, the switching element 163 may be a field effect transistor, and the output voltages of the dimming sensor 161 and the human body sensor 162 become gate voltages of the field effect transistor, so that the user senses when the surroundings are dark. When the output voltage of a predetermined magnitude is output from the dimming sensor 161 and the human body sensor 162 to electrically conduct from the source of the field effect transistor to the drain, the LED array 119 is driven. Light may be irradiated from the LED array 119 to the surrounding area by the dimming sensor 161 and the human body sensor 162 without direct on-off control of the user. On the other hand, when the surroundings are bright or the user is not sensed, the LED array 119 is not driven because the LED is electrically disconnected from the source to the drain of the field effect transistor so that light is not irradiated from the LED array 119.

Here, the dimming sensor 161 detects the amount of light from the surrounding environment, and is made of a CdS (cadmium sulfide) sensor having a property of decreasing electrical resistance when the amount of incident light increases and increasing electrical resistance when the amount of incident light decreases. Can be. Therefore, the switch element 163 may control the on-off of the LED array 119 by the amount of light sensed by the dimming sensor 161.

Therefore, according to the configuration of the circuit unit 110 as described above, the LED array 119 can be driven by directly receiving AC power from the AC power supply unit 10 without using an SMPS, thereby optimizing for an indoor space. By minimizing the volume of the LED downlight 100, it can have a beautiful and elegant appearance. In addition, the life of the circuit unit 110 can be extended by not using an electrolytic capacitor, and the manufacturing cost can be reduced by remarkably reducing the number of elements constituting the circuit unit 110. In addition, since the driving of the LED array 119 is controlled by the dimming sensor 161 and the human body sensor 162, power consumption may be minimized and convenience may be provided to the user. Furthermore, the power consumption may be minimized by configuring the circuit unit 110 having a high power factor.

Meanwhile, referring to FIGS. 1 to 3, the configuration of the LED down light 100 having the above-described circuit unit 110 embedded or attached to the indoor ceiling 20 will be described in detail as follows.

First, the enclosure case 120 is formed in a cylindrical shape having an open lower surface, and a circuit portion 110 implemented as a PCB substrate is fixedly formed in an internal space, and a plurality of heat dissipation holes 121 are formed in a predetermined shape on a side surface thereof. Here, the heat dissipation opening 121 is formed of a plurality of openings to smoothly dissipate heat that is more than necessary when driving the LED array 119 of the circuit unit 110 to the outside to damage the circuit unit 110 due to excessive temperature rise or Effectively prevent malfunctions.

Next, the heat dissipation adhesive 130 is interposed between the circuit unit 110 and the upper surface of the enclosure case 120 to fix and fix the circuit unit 110 to the lower side of the upper surface of the enclosure case 120, and the LED array of the circuit unit 110 ( More than necessary heat generated during the driving of 119 is smoothly dissipated to the outside.

Next, the lens 140 may radiate light from the LED array 119 of the circuit unit 110 while diffusing to the outside and prevent excessive glare of the user.

Next, the lens cover 150 is formed in a cylindrical shape with an upper surface and a lower surface open and coupled to face the enclosure case 120, and the lens cover 150 is mounted to fix the lens 140 to an internal space. The portion 151 and the plurality of lens fixing pieces 152 protrude inwardly. That is, the lens 140 is inclined and inserted from the upper side of the lens fixing piece 152 so that the edge of the lens 140 is seated on the seating part 151, and the lens 140 is attached to the lens cover by the lens fixing piece 152. 150 is stably fixed.

On the other hand, the LED downlight 100 of the above-described configuration is fixed to the ceiling 20 by the ceiling fixing member 170 is formed or fixed, or embedded in the ceiling 20 by the ceiling embedded fixing member 180 is fixed. Can be formed.

First, in the example in which the LED downlight 100 is fixed to the ceiling 20, a plurality of fixing holes 122 are formed in the upper surface of the enclosure case 120, the circuit unit 110 and the heat dissipation adhesive The through holes 110-1 and 131 opened corresponding to the fixing holes 122 are formed in the 130, respectively, and the bolts 171 and the bolts 171 passing through the through holes 110-1 and 131 and the fixing holes 122 are formed. By the ceiling fixing member 170 made of a nut 172 coupled to one end of the), the enclosure case 120 can be fixed and firmly fixed to the ceiling (20).

Second, in the example in which the LED downlight 100 is embedded in the ceiling 20, fixed to the spring fixing pin 181, the spring fixing pin 181 which is opened on the side of the enclosure case 120 and protruded oppositely. The locking projection 183 is connected to the ceiling 20 by the ceiling embedding fixing member 180 including a spring 182 on which both ends are elastically fixed, and a locking protrusion 183 coupled to both ends of the spring 182. The embedded enclosure case 120 may be elastically fixed to the ceiling 20. For example, a rim 153 extending outward is formed at the outer circumferential edge of the lens cover 150, and the ceiling 20 interposed between the rim 153 and the locking protrusion 183 is a spring 182. Pressed by the elastic force of the enclosure case 120 may be securely and securely embedded in the ceiling (20).

Meanwhile, referring to FIG. 3, a coupling groove 154 curved inwardly is formed at a side of the lens cover 150, and a coupling groove 154 of the lens cover 150 is formed at an inner circumference of the side of the enclosure case 120. The leaf spring 123 bent in a shape corresponding to the fixed form, the enclosure case 120 and the lens cover 150 may be elastically mutually coupled or separated from each other by the leaf spring (123). For example, one end of the leaf spring 123 is fixed to the side inner periphery of the enclosure case 120, the other end of the leaf spring 123 is formed spaced apart from the side inner periphery of the enclosure case 120, the leaf spring 123 ) Is elastically coupled to or separated from the coupling groove 154 of the lens cover 150, thereby simplifying assembly and disassembly of the enclosure case 120 and the lens cover 150, thereby increasing the manufacturing time of the LED downlight 100. It can be significantly shortened and repair and replacement of internal components can also be easier.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

100: LED down light 110: circuit part
111: AC power input terminal 112: fuse
113: negative temperature coefficient temperature compensation resistance 114: varistor
115: bridge rectifier 115-1: anode
115-2: cathode 116: transient voltage suppression element
117: capacitor 118: constant current diode
119: LED array R: resistor
110-1: through hole 120: enclosure case
121: heat dissipation hole 122: fixing hole
123: leaf spring 130: heat dissipation adhesive
131: through hole 140: lens
150: lens cover 151: seating portion
152: Lens fixing piece 153: Rim
154: coupling groove 161: dimming sensor
162: human body detection sensor 163: switching element
170: ceiling fixing member 171: bolt
172: nut 180: ceiling embedded fixing member
181: spring fixing pin 182: spring
183: engaging projection 10: AC power supply
20: ceiling

Claims (5)

In the LED downlight having a circuit unit for converting the AC power input to the AC power input terminal to a DC power source to drive at least one LED array,
A fuse for blocking an overcurrent input to the AC power input terminal;
A negative temperature coefficient temperature detection sensor for limiting inrush current input to the AC power input terminal;
A varistor connected to the AC power input terminal in parallel to block overvoltage;
A bridge rectifier for full-wave rectifying AC power input to the AC power input terminal;
A transient voltage suppression element for suppressing a transient voltage which is converted into DC power through the bridge rectifier and outputted;
A capacitor connected to the positive and negative poles of the bridge rectifier to remove ripple noise included in a power source rectified by the bridge rectifier;
A resistor connected in series with the noise removing capacitor and distributing a voltage of a DC power stabilized by the noise removing capacitor;
And a circuit portion connected in series with said resistor, said circuit portion comprising at least two constant current diodes for supplying a constant current to said LED array. The method according to claim 1,
A dimming sensor connected to an output terminal of the LED array to sense ambient brightness;
A human body detecting sensor connected to an output terminal of the LED array to sense a user of a peripheral area;
And a switching element connected in series with a cathode of a final stage of the at least one LED array to control the LED array on-off by a current sensed by the dimming sensor and the human body sensor. Downlight. The method according to claim 1 or 2,
An outer case is formed in an open cylindrical shape, the circuit portion is fixed to the inner space, the enclosure case is formed with a plurality of heat dissipation side,
A heat dissipation adhesive interposed between the circuit portion and the upper surface of the enclosure case to adhesively fix the circuit portion to the upper surface of the enclosure case and to dissipate heat generated when the LED array of the circuit portion is driven to the outside;
A lens for diffusing light from the LED array of the circuit unit and radiating the light to the outside;
An LED down including an upper surface and a lower surface having an open cylindrical shape, coupled to face the enclosure case, and a seating portion for fixing the lens to an inner space and a lens cover protruding inwardly. light. The method according to claim 3,
A plurality of fixing holes are formed on an upper surface of the enclosure case, and through holes are formed in the circuit unit and the heat dissipating adhesive corresponding to the fixing holes, respectively, and bolts passing through the through holes and the fixing holes and one end of the bolts. The enclosure case is fixed to the ceiling by a ceiling attachment member comprising a nut coupled to the ceiling,
A rim extending outward is formed at an outer circumferential edge of the lens cover, a spring fixing pin which is opened on a side of the enclosure case and protrudes to face the spring, a spring that is elastically fixed to the spring fixing pin, and both ends of the spring. The LED downlight for fixing the enclosure case to the ceiling by pressing the ceiling interposed between the rim and the locking projection by the elastic force of the spring by the ceiling embedded fixing member consisting of a locking projection coupled to the. The method according to claim 3,
The side of the lens cover is formed with a coupling groove bent inwardly,
The side inner periphery of the enclosure case is fixed to the leaf spring of the shape corresponding to the coupling groove of the lens cover, LED enclosure, characterized in that the enclosure case and the lens cover is elastically coupled by the leaf spring. light.

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