CN205299281U - Light -emitting diode (LED) tube lamp - Google Patents

Abstract

The utility model relates to a light -emitting diode (LED) tube lamp, it includes: the power pack upper cover, the power pack lower cover, a drive uni. The radiator, and a front cover. The diffuser plate, its characterized in that, a plurality of LED units of LED light source module are according to the direction of current flow, and the quantity of LED chip tapers off and arranges in every LED unit, and drive arrangement includes rectifier module, control module, constant -current module and energy storage module to constant -current module sets up between control module and LED light source module. The utility model discloses a light -emitting diode (LED) tube lamp power factor height, convenient assembling, safety and stability nature are good.

Description

A kind of LED Down lamp

Technical field

The utility model relates to a kind of LED lighting device, relates in particular to a kind of LED Down lamp.

Background technology

LED is the light that is produced superhigh intensity by superconduction luminescent crystal, and the heat that it sends is little, because it is energy-conservation, and workMake voltage low, the life-span is long, environmental protection, and the performances such as high light efficiency, LED is known as environment-friendly type high-tech light of new generation by the whole world nowSource.

Because the ideal operation mode of LED is to adopt constant current to drive, present civil power is sinusoidal ac, so must be rightPower supply is changed. And the common conversion electric power life-span is significantly shorter than the life-span of LED, thereby restrict the reality of LED lighting deviceBorder service life.

The direct driving LED technology of a kind of published alternating current, adopts the method for resistance-capacitance depressurization, the letter of this method structure moreSingle, but delivery efficiency is low, and if components and parts select improper, not only can not step-down, also can cause the damage of circuit. Up-to-dateImproved constant current technology, first rectification, then plurality of LEDs assembly (can comprise the current limiting device of series connection with it, as constant current two utmost pointsPipe) be connected on after rectification unit according to the tube voltage drop of coupling, the suitable switch that adds in the middle of the LED assembly of series connection, by pointThe mode that section is lighted improves the utilization rate of power supply. Find the utilization rate impact of the ratio of LED segmentation on power supply through great many of experimentsQuite large. Therefore, thus determine that power factor and light efficiency that rational segmentation scales improves light fixture are also those skilled in the artThe problem solving.

The advantages such as that LED Down lamp has compared with traditional Down lamp is energy-conservation, low-carbon (LC), longevity, it is designed beautifully lightly, installation sideJust. Because its light source is hidden in building decoration inside, light source does not leak outside, free from glare, light efficiency be soft be evenly widely used toDomestic lighting and office lighting. What dependence was fixed in the installation of traditional its diffuser plate of LED Down lamp is that front cover of lamp exists its concora crushIn the positioning step or draw-in groove of radiator. Normal design for convenient for assembly all can design and installation gap. When light fixture assembling, heat radiationBody will be connected by screw with protecgulum surrounding side. Due to the existence in gap, before the local stress that screw produces can makeThere is the buckling deformation away from diffuser plate in the face that lid companding falls apart. Show by experiment, this deflection can exceed diffuser plate conventionallyThickness, thus make the diffuser plate have in light fixture arbitrarily mobile space, make light fixture produce the safety that diffuser plate comes off hiddenSuffer from; The another kind of normal solution adopting is that the part contacting with radiator at diffuser plate is coated with one deck glue, and diffuser plate is sticked onOn lower house, the defect of this solution is in the time that light fixture is in applied environment, and due to the impact of temperature and humidity, glue veryEasily aging yellowing even lost efficacy, and that is to say the still not fundamentally elimination of potential safety hazard that diffuser plate comes off.

Utility model content

For the deficiency of above prior art, problem to be solved in the utility model be to provide a kind of power factor high, dressThe LED Down lamp that formula just, security and stability is good.

Specifically, the LED Down lamp that the utility model provides, it comprises: power pack upper cover; Power pack lower cover, with describedPower pack detachable upper cover unloads and links together and form an enclosure space; Drive unit, be arranged on described power pack upper cover andIn the enclosure space that described power pack lower cover forms, and described drive unit is connected electrically in external ac power source and LED light sourceBetween module; Radiator, is connected under described power pack and covers, and is formed as the cylindric of one end sealing other end opening; LEDLight source module, is arranged on the openend of described radiator, is provided with multiple LED unit on it; Protecgulum, is removably fixed to looseThe openend of hot body, and form enclosure space so that described LED light source module is accommodated in the inner with described radiator; Diffuser plate, establishesPut between described LED light source module and described protecgulum; It is characterized in that, multiple LED unit of described LED light source module according toThe sense of current, in each LED unit, the quantity of LED chip tapers off and arranges, and described drive unit comprises rectification module, controls mouldPiece, constant flow module and energy-storage module, and described constant flow module be arranged on described control module and described LED light source module itBetween.

According to a preferred embodiment, described LED light source module comprises a LED unit, the 2nd LED unit, the 3rdLED unit, wherein, a described LED unit, described the 2nd LED unit and described the 3rd LED unit are according to side from outside to insideFormula is arranged ringwise, and the LED chip of a described LED unit, described the 2nd LED unit and described the 3rd LED unitQuantity is than for 5:4:3, and described LED Down lamp startup stage, described drive unit is according to a described LED unit, instituteState the order of the 2nd LED unit, described the 3rd LED unit and light described LED light source module.

According to a preferred embodiment, described rectification module comprises diode and electric capacity, wherein said diode negativeOne end of end and described electric capacity is connected to form the output plus terminal of described rectification module, the other end of described electric capacity and AC power phaseConnect, and the other end of described electric capacity forms the output negative terminal of described rectification module.

According to a preferred embodiment, described constant flow module comprises the first constant current unit, the second constant current unit and the 3rdConstant current unit, each constant current unit comprises respectively a transistor and a feedback resistance, in each constant current unit, its crystalThe drain electrode of pipe connects the output of corresponding LED unit, and its transistorized grid connects described control module, its transistorized sourceThe utmost point is connected to the transistorized source electrode of next constant current unit via its feedback resistance.

According to a preferred embodiment, described control module comprises the first resistance, the second resistance and controlled source of stable pressure, instituteState between the output plus terminal and output negative terminal that control module is connected to described rectification module, wherein, described controlled source of stable pressure negativeEnd is connected to the output plus terminal of described rectification module via described the first resistance, and the negative terminal of described controlled source of stable pressure is also distinguishedConnect the transistorized grid of each constant current unit, the anode of described controlled source of stable pressure connects the output of described rectification module and bearsEnd, the reference edge of described controlled source of stable pressure is connected to described transistorized source electrode via described the second resistance.

According to a preferred embodiment, described energy-storage module comprises storage capacitor, and one end of described storage capacitor connectsThe input of the output plus terminal of described rectification module and described LED module, the other end of described electric capacity connects described LED light source mouldThe output of group.

According to a preferred embodiment, the openend of described radiator is formed with the step for taking up described diffuser plateChamber, and described step chamber keeps mating with described diffuser plate, makes described step chamber be enough to hold described diffuser plate.

According to a preferred embodiment, described protecgulum is arranged on the openend of described radiator in form fit mode,The surface of described protecgulum is along circumferentially offering installing hole, and described diffuser plate has the through hole corresponding with described installing hole, described inThrough hole on diffuser plate and described in the monolateral gap that is reserved with 0.1～0.5mm between post that presses, the step chamber of described radiator is dividedBe furnished with the counterbore corresponding with described through hole, the post that presses will in the mode that runs through described installing hole, described through hole and described counterboreDescribed protecgulum and described diffuser plate are fixed to described radiator.

According to a preferred embodiment, the side of described protecgulum is distributed with screwed hole, makes described protecgulum and described looseHot body is connected and fixed with thread connecting mode.

According to a preferred embodiment, a LED unit of described LED light source module, described the 2nd LED unit and instituteThe initially time of lighting of stating the 3rd LED unit is t1, t2, and t3, the threshold value of getting each LEDs chip is 2.5V, three sections of surveyCut-in voltage is respectively vf1=82.5V, vf2=150V, vf3=200V.

82.5＝311*sin(t1)

150＝311*sin(t2)

200＝311*sin(t3)

Solve: t1=15.4

t2＝28.5

t3＝40

Obtain the ON time of three sections than being 1.14:1:4.4.

The mode that the utility model adopts segmentation to light, optimizes optimum segmentation scales, can significantly reduce inputThe harmonic wave of electric current, improves power factor, improves the light efficiency of LED. Meanwhile, the utility model adopts the fixing expansion of the post fixed form that pressesFall apart, it is fixing that this fixed form is better than freely press-fiting of traditional LED panel light, avoided diffuser plate freely to move in the horizontal directionMoving possibility, from eliminated the potential safety hazard that LED panel light diffuser plate comes off at all. And the utility model is simple in structure, rightThe assembling of whole LED panel light has realized and having one-time fixed.

Brief description of the drawings

Fig. 1 is the explosive view of LED Down lamp of the present utility model;

Fig. 2 is the cutaway view of LED Down lamp of the present utility model;

Fig. 3 is the partial sectional view of LED Down lamp of the present utility model;

Fig. 4 is the schematic diagram of the direct driving LED circuit of alternating current;

Fig. 5 is the drive circuit figure of LED Down lamp of the present utility model;

Fig. 6 is the unidirectional sinuous pulsation DC voltage waveform signal of the rectification unit output of LED Down lamp of the present utility modelFigure;

Fig. 7 is after the unidirectional sinuous pulsation DC voltage rectification of rectification unit output of LED Down lamp of the present utility modelVoltage oscillogram;

Fig. 8 is the input current waveform schematic diagram of LED Down lamp of the present utility model; With

Fig. 9 is the internal LED light source module layout viewing of LED Down lamp of the present utility model.

Reference numerals list

100:LED Down lamp 101: installing hole 102: power pack upper cover

103: drive unit 104: through hole 105: power pack lower cover

106: spring assembly 107: radiator 108: counterbore

109:LED light source module 110: post 10 presses: rectification module

20: control module 30: constant flow module 40: energy-storage module

11: diode 12: 21: the LED unit of electric capacity

23: the three 101: the first diodes in LED unit in 22: the two LED unit

104: the four diodes of 103: the three diodes of 102: the second diodes

202: the second resistance 203 of 201: the first resistance: controlled source of stable pressure

303: the three constant current unit, 302: the second constant current unit, 301: the first constant current unit

311,312,313: transistor 321,322,323: feedback resistance

Detailed description of the invention

Illustrate the utility model below in conjunction with accompanying drawing.

Fig. 1 shows a kind of LED Down lamp 100, and it comprises power pack upper cover 102, power pack lower cover 105, drive unit103, radiator 107, LED light source module 109, protecgulum 112 and diffuser plate 111. Power pack lower cover 105 and power pack upper cover 102Removably link together and form an enclosure space, in sealing space, being provided with drive unit 103. Drive unit 103Be connected electrically between external ac power source and LED light source module 109. Radiator 107 is connected and is formed as with power pack lower cover 105The cylindric of other end opening sealed in one end. Radiator 107 outsides are distributed with radiating fin vertically, with increasing heat radiation area volumeThereby raising radiating efficiency. And, be provided with spring assembly 106 at the edge of the blind end of radiator 107, in order to by radiator107 and protecgulum is dismountable is fixed together. Spring assembly 106 comprises Rectangular Spring and spring support. Spring assembly 106 passes throughSpring support is fixed on radiator 107. LED light source module 109 is arranged on the openend of radiator 107, is provided with many on itIndividual LED unit. Protecgulum 112 is removably fixed to the openend of radiator 107, and with radiator 107 form enclosure space withLED light source module 109 is accommodated in the inner. Diffuser plate 111 is arranged between LED light source module 109 and protecgulum 112.

In conjunction with Fig. 2 and Fig. 3, the openend of radiator 107 is formed with the step chamber for taking up diffuser plate 111. This stepChamber keeps mating with diffuser plate 111, comprises form fit and size coupling, makes step chamber be enough to hold diffuser plate 111. StepThe height in chamber is at least greater than the thickness of diffuser plate 111 or equates with the thickness of diffuser plate 111. In order to reduce as far as possible protecgulum112 and diffuser plate 111 between assemblage gap, thereby dwindle small product size and improve the steadiness installed of diffuser plate 111, excellentThe height in chamber, channel selection rank equates with the thickness of diffuser plate 111.

Referring to pure exaggeration illustrative diagram 3, protecgulum 112 is arranged on the openend of radiator 107 in form fit mode. BeforeThe surface of lid 112 is along circumferentially offering installing hole 101. Diffuser plate 111 has the through hole corresponding with installing hole 101 104. Heat radiationThe step chamber of body 107 is distributed with the counterbore corresponding with through hole 104 108. Press post 110 with penetrating mounting holes 101, through hole 104With the mode of counterbore 108, protecgulum 112 and diffuser plate 111 are fixed to radiator 107, can effectively avoid diffuser plate 111 at waterSquare to movement, even if warping deformation occurs protecgulum 112, diffuser plate 111 is still securely fixed on radiator 107,Can there is not potential potential safety hazard.

According to do not show in figure preferred embodiment, the side of protecgulum 112 is distributed with screwed hole, makes protecgulum112 are connected and fixed with thread connecting mode with radiator 107.

According to a preferred embodiment, the through hole 104 on diffuser plate 111 and press monolaterally between post 110 be reserved with 0.1～The gap of 0.5mm. The utility model is convenient to Product Assembly by the mode of interference fits, improves efficiency of assembling. And, due to expansionWhat fall apart 111 employings is Merlon (PC) material, easily expands with heat and contract with cold, and can hold by the gap of setting monolateral 0.5mmThe error that diffuser plate 111 produces because expanding with heat and contract with cold.

Referring to Fig. 9, multiple LED unit of LED light source module 109 is according to the sense of current, LED chip in each LED unitQuantity taper off and arrange.

As shown in Figure 5, LED light source module 109 comprises a LED unit 21, the 2nd LED unit 22, the 3rd LED unit23. Arrange ringwise according to mode from outside to inside in the one LED unit 21, the 2nd LED unit 22 and the 3rd LED unit 23. TheThe quantity ratio of the LED chip of one LED unit 21, the 2nd LED unit 22 and the 3rd LED unit 23 is 5:4:3, and, at LED cylinderLamp startup stage, drive unit 103 is suitable according to a LED unit 21, the 2nd LED unit 22, described the 3rd LED unit 23Order is lighted described LED light source module 109.

Drive unit 103 comprises rectification module 10, control module 20, constant flow module 30 and energy-storage module 40. Constant flow module30 are arranged between control module 20 and LED light source module 109.

Rectification module 10 comprises diode 11 and electric capacity 12. One end of the negative terminal of diode 11 and electric capacity 12 is connected to form wholeThe output plus terminal of flow module 10. The other end of electric capacity 12 is connected with AC power, and the other end of electric capacity 12 has formed rectificationThe output negative terminal of module 10.

Constant flow module 30 comprises the first constant current unit 301, the second constant current unit 302 and the 3rd constant current unit 303. Each perseveranceStream unit comprises respectively a transistor 311,312,313 and a feedback resistance 321,322,323. In each constant current unitIn, its transistorized drain electrode connects the output of corresponding LED unit, its transistorized grid link control module 20, its crystalline substanceThe source electrode of body pipe is connected to the transistorized source electrode of next constant current unit via its feedback resistance.

Control module 20 comprises the first resistance 201, the second resistance 202 and controlled source of stable pressure 203. Control module 20 is connected toBetween the output plus terminal of rectification module 10 and output negative terminal. The negative terminal of controlled source of stable pressure 203 is connected to whole via the first resistance 201The output plus terminal of flow module 10. The negative terminal of controlled source of stable pressure 203 also connects respectively the transistorized grid of each constant current unit. CanThe anode of control source of stable pressure 203 connects the output negative terminal of rectification module 10. The reference edge of controlled source of stable pressure 203 is via the second resistance202 are connected to the source electrode of transistor 311,312,313.

Energy-storage module 40 comprises storage capacitor. One end of storage capacitor connects output plus terminal and the LED mould of rectification module 10The input of group 109. The other end of electric capacity connects the output of LED light source module 109.

Electric main (AC) is through rectification module 10 output ripple direct currents. Behind constant current unit, obtain stable streamCross the electric current of LED unit. The forward conduction voltage of LED unit 21,22,23 is VF1, VF2, VF3.

Its working method is:

When initial, when pulsating dc voltage rises to VF1 by 0V, behind constant current unit 301, obtain stable electric currentI1,21 conductings of LED unit start luminous. In the time that voltage rises to VF1+VF2 from VF1, constant current unit 301 is closed, constant current unit302 open, and 21,22 conductings of LED unit start luminous, and now electric current is I2. Rise to VF1+VF2+ at voltage from VF1+VF2When VF3, constant current unit 302 is closed, and constant current unit 303 is opened, and the whole conductings of LED grouping light source 21,22,23 are luminous.

Rectification module 10 is rectified into unidirectional Rectified alternating current the electric main of input, and voltage waveform as shown in Figure 7. EachThe electric current Vref/ Σ of direct current_n＝iRi, the other end of the current setting resistor of afterbody constant current unit is directly connected to rectification listUnit's output negative terminal.

Concrete: along with AC power supplies voltage continues to rise, under constant current state, the voltage that a LED unit 21 bears keepsConstant, its unnecessary voltage drop is born by metal-oxide-semiconductor, is also born perseverance by the 2nd LED unit 22 and the second constant current unit 302The constant current of stream mode is Vref/ (R321+R322); When voltage has reached a LED unit 21 and the 2nd LED unit 22After on state threshold voltage, the second constant current unit 302 is convinced by patient analysis logical, and constant current after-current is Vref/ (R322), and transistor 311 turn-offs.

In the time that input voltage starts to decline from 310V, LED unit is all entirely bright, and the electric current of lighting unit is Vref/R323, itsIts constant current unit is all closed. Along with voltage reduces gradually, when voltage is during lower than the conducting voltage of three LED assembly subelements, electricityStream starts to decline, and in the time that electric current is low to moderate Vref/ (R323+R322), the 3rd LED unit extinguishes, along with voltage continues to reduce, and secondLED unit, a LED unit extinguishes gradually.

Referring to Fig. 8, getting 1/4 cycle is example, t1, and t2, t3 is respectively first paragraph, second segment, the 3rd section of LED chip lightedTime time, in figure, shaded area is unemployed power in circuit. So the area of dash area should be the smaller the better.

The utility model adopts three kinds of schemes, by a number of first paragraph LED, and a number of second segment LED, the 3rd section of LED'sNumber, this number ratio of three sections, according to increasing progressively, successively decreases, and the scheme of dividing equally arranges respectively, tests.

In experiment, 80 LEDs chips are divided into three sections, according to increasing progressively, successively decrease respectively, the ratio of dividing equally is arranged. WarpCross a large amount of experiments and find, adopt the scheme of successively decreasing, the stability to circuit and electronic devices and components and security have certain guarantorBarrier, can effective prefabricated hot plug cause damage to circuit, and have higher power factor, and Harmonics of Input is also less

Get ratio of greater inequality 5:4:3, an actual number ratio is 33:27:20, calculating t1, and t2, t3, gets the threshold of each LEDs chipValue is 2.5V. The cut-in voltage of three sections of surveying is respectively vf1=82.5V, vf2=150V, vf3=200V.

82.5＝311*sin(t1)

150＝311*sin(t2)

200＝311*sin(t3)

Solve: t1=15.4

t2＝28.5

t3＝40

Obtain the ON time of three sections than being 1.14:1:4.4.

Being illustrated in figure 9 the inner LED distribution map of shot-light, is 5 by ratio, and ratio is 4, and the LED that ratio is 3 is annular rowCloth is on light source board. Add after power supply, the LED unit that ratio is 5 is lighted at first, is secondly that ratio is 4, and the LED that ratio is 3 is mono-Unit lights, and order when extinguishing is that ratio is 3 successively, and ratio is 4, the LED unit that ratio is 5. Arrange like this, can make lightSource is uniformly distributed, and effectively avoids blackspot.

Ratio is 5 LED unit, and the component of smearing fluorescent material should be maximum, is secondly that ratio is 4 LED unit, and ratio is3 LED unit, can reach desirable colour temperature like this.

It should be noted that above-mentioned specific embodiment is exemplary, those skilled in the art can be at the utility modelUnder the inspiration of disclosure, find out various solutions, and these solutions also all belong to open scope of the present utility model alsoWithin falling into protection domain of the present utility model. It will be understood by those skilled in the art that the utility model description and accompanying drawing thereofBe illustrative and not form limitations on claims. Protection domain of the present utility model is by claim and equivalent thereofLimit.

Claims (9)

1. a LED Down lamp (100), it comprises:

Power pack upper cover (102);

Power pack lower cover (105), removably links together and forms an enclosure space with described power pack upper cover (102);

Drive unit (103), is arranged on the sealing sky that described power pack upper cover (102) and described power pack lower cover (105) formIn, and described drive unit (103) is connected electrically between external ac power source and LED light source module (109);

Radiator (107), is connected to described power pack lower cover (105) upper, and is formed as the cylinder of one end sealing other end openingShape;

LED light source module (109), is arranged on the openend of described radiator (107), is provided with multiple LED unit on it;

Protecgulum (112), is removably fixed to the openend of radiator (107), and forms sealing sky with described radiator (107)Between so that described LED light source module (109) is accommodated in the inner;

Diffuser plate (111), is arranged between described LED light source module (109) and described protecgulum (112);

It is characterized in that,

Multiple LED unit of described LED light source module (109) is according to the sense of current, the quantity of LED chip in each LED unitTaper off and arrange,

Described drive unit (103) comprises rectification module (10), control module (20), constant flow module (30) and energy-storage module(40), and described constant flow module (30) be arranged between described control module (20) and described LED light source module (109).

2. LED Down lamp as claimed in claim 1 (100), is characterized in that, described LED light source module (109) comprises firstLED unit (21), the 2nd LED unit (22), the 3rd LED unit (23), wherein,

A described LED unit (21), described the 2nd LED unit (22) and described the 3rd LED unit (23) are according to from outside to insideMode arrange ringwise, and

The number of the LED chip of a described LED unit (21), described the 2nd LED unit (22) and described the 3rd LED unit (23)Amount is than for 5:4:3, and, described LED Down lamp startup stage, described drive unit (103) is according to a described LED unit(21), the order of described the 2nd LED unit (22), described the 3rd LED unit (23) is lighted described LED light source module (109).

3. LED Down lamp as claimed in claim 2 (100), is characterized in that, described rectification module (10) comprises diode (11)And electric capacity (12), one end of the negative terminal of wherein said diode (11) and described electric capacity (12) is connected to form described rectification module(10) output plus terminal, the other end of described electric capacity (12) is connected with AC power, and the other end structure of described electric capacity (12)Become the output negative terminal of described rectification module (10).

4. LED Down lamp as claimed in claim 3 (100), is characterized in that, described constant flow module (30) comprises the first constant current listUnit (301), the second constant current unit (302) and the 3rd constant current unit (303), each constant current unit comprises respectively a transistor(311,312,313) and a feedback resistance (321,322,323),

In each constant current unit, its transistorized drain electrode connects the output of corresponding LED unit, and its transistorized grid connectsConnect described control module (20), its transistorized source electrode is connected to the transistorized source of next constant current unit via its feedback resistanceThe utmost point.

5. LED Down lamp as claimed in claim 4 (100), is characterized in that, described control module (20) comprises the first resistance(201), the second resistance (202) and controlled source of stable pressure (203), described control module (20) is connected to described rectification module (10)Between output plus terminal and output negative terminal, wherein,

The negative terminal of described controlled source of stable pressure (203) is connected to the defeated of described rectification module (10) via described the first resistance (201)Go out anode, and the negative terminal of described controlled source of stable pressure (203) also connects respectively the transistorized grid of each constant current unit,

The anode of described controlled source of stable pressure (203) connects the output negative terminal of described rectification module (10),

The reference edge of described controlled source of stable pressure (203) via described the second resistance (202) be connected to described transistor (311,312,313) source electrode.

6. LED Down lamp as claimed in claim 5 (100), is characterized in that, described energy-storage module (40) comprises storage capacitor,One end of described storage capacitor connects the input of output plus terminal and the described LED light source module (109) of described rectification module (10)End, the other end of described electric capacity connects the output of described LED light source module (109).

7. LED Down lamp (100) as described in one of claim 1 to 6, is characterized in that, the openend shape of described radiator (107)Become to be useful on the step chamber that takes up described diffuser plate (111), and the maintenance of described step chamber and described diffuser plate (111) mates,Make described step chamber be enough to hold described diffuser plate (111).

8. LED Down lamp as claimed in claim 7 (100), is characterized in that,

Described protecgulum (112) is arranged on the openend of described radiator (107) in form fit mode, described protecgulum (112)Edge, surface circumferentially offers installing hole (101),

Described diffuser plate (111) has the through hole (104) corresponding with described installing hole (101), on described diffuser plate (111)The monolateral gap that is reserved with 0.1～0.5mm between through hole (104) and the post that presses (110),

The step chamber of described radiator (107) is distributed with the counterbore (108) corresponding with described through hole (104),

Press post (110) with run through described installing hole (101), described through hole (104) and described counterbore (108) mode will described inProtecgulum (112) and described diffuser plate (111) are fixed to described radiator (107).

9. LED Down lamp as claimed in claim 8 (100), is characterized in that, the side of described protecgulum (112) is distributed with screw threadHole, makes described protecgulum (112) and described radiator (107) be connected and fixed with thread connecting mode.