CN102345808A

CN102345808A - Light emitting diode (LED) illumination device

Info

Publication number: CN102345808A
Application number: CN2010102456025A
Authority: CN
Inventors: 赖志铭
Original assignee: Foxsemicon Integrated Technology Shanghai Inc; Foxsemicon Integrated Technology Inc
Current assignee: Foxsemicon Integrated Technology Shanghai Inc; Foxsemicon Integrated Technology Inc
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2012-02-08

Abstract

The invention relates to a light emitting diode (LED) illumination device. The device comprises a first lamp string and a second lamp string which are connected in parallel, and a variable resistor connected between the first lamp string and the second lamp string, wherein each lamp string comprises at least one LED connected in series; one part of resistance of the variable resistor is connected in series with the first lamp string, and the other part of resistance of the variable resistor is connected in series with the second lamp string; and by changing the position of a sliding sheet of the variable resistor, current which flows through one of the first lamp string and the second lamp string is increased and current which flows through the other of the first lamp string and the second lamp string is reduced, so that the color temperature of light rays of the LED illumination device is adjusted.

Description

The LED lighting device

Technical field

The present invention relates to a kind of lighting device, especially a kind of lighting device that adopts light emitting diode.

Background technology

At present, and light emitting diode (Light Emitting Diode, LED) as a kind of light source, good because of the tool light quality, luminous efficiency is high, color is various and reaction speed is fast etc., and characteristic is widely used in each technical field.Raising along with urban construction and townie up-to-dateness; People decorate outdoor light such as building, square; And the requirement that room lights such as public place of entertainment, inhabitation place are decorated also improves gradually, therefore, adopts LED also to increase gradually as the demand of the light source of lighting device.

How being directed against different being shone the space, build attractive in appearance, comfortable luminous environment is an important topic of modern illumination, and colour temperature is to influence one of greatest factor of being shone the spatial light environmental degree of comfort.In the prior art; Usually adopt pulse width modulation (Pulse Width Modulation; PWM) technology changes colour temperature; Through changing the frequency of the pwm signal of importing lighting device; Changing the luminous intensity that LED sends in this lighting device, thereby adjust the colour temperature of the light that this lighting device sends.Yet, adopt PWM to control the mode of this lighting device colour temperature, the circuit of this lighting device needs AC-DC converter, DC-DC transformer and complex circuit design such as PWM chip for driving and peripheral circuit thereof, not only causes illumination efficiency to reduce and the cost increase.

Summary of the invention

In view of this, be necessary to provide a kind of LED lighting device of adjustable color temperature in fact.

A kind of LED lighting device; Comprise the first lamp string and the second lamp string that are connected in parallel; Each lamp string comprises at least one LED of mutual serial connection; This LED lighting device also comprises a variable resistance that is connected between the first lamp string and the second lamp string; The a part of resistance of this variable resistance and the first lamp string are connected in series; Another part resistance and the second lamp string are connected in series; The position of the slide plate by changing this variable resistance; Flow through when wherein the electric current of a lamp string increases in the said first lamp string and the second lamp string electric current of another lamp string reduces thereby making flows through, with the colour temperature of the light of adjusting this LED lighting device.

Compared with prior art; This LED lighting device comprise the first lamp string and the second lamp string and be series at the first lamp string and the second lamp string between a variable resistance; The position of the slide plate through changing this variable resistance; Making flows through, and flow through when wherein the electric current of a lamp string increases in the said first lamp string and the second lamp string electric current of another lamp string reduces; Colour temperature with the light of adjusting this LED lighting device; Therefore; This LED lighting device does not use the PWM technology and reaches the purpose of modulation colour temperature; Thereby the simplification circuit structure is saved cost.

With reference to the accompanying drawings, in conjunction with specific embodiment the present invention is done further description.

Description of drawings

Fig. 1 is the stereogram of the LED lighting device in one embodiment of the invention.

Fig. 2 is the sketch map of the circuit of the LED lighting device in the first embodiment of the present invention.

Fig. 3 is the sketch map of the circuit of the LED lighting device in the second embodiment of the present invention.

Fig. 4 is the sketch map of the circuit of the LED lighting device in the third embodiment of the present invention.

The main element symbol description

Led light source	?10
		Circuit	?100、200、300
The first lamp string	?101
		The second lamp string	?102
Substrate	?11
		LED	?12
The one LED	?121
		The 2nd LED	?123
Lampshade	?20
		Radiator	?30
First end face	?31
		Second end face	?32
The side	?33
		Groove	?35
Opening	?36
		Joint	40
First regulates button	50
		Second regulates button	55
Dc source	60
		AC power	70
Transformer	72
		Bridge rectifier	71
First variable resistance	80
		Slide plate	81、86
First binding post	82
		Second binding post	83
The second adjustable resistance device	85
		The LED lighting device	90

The specific embodiment

See also Fig. 1, the joint 40, one first that the LED lighting device 90 in the first embodiment of the present invention comprises a led light source 10, cover at the peripheral lampshade 20 of led light source, electrically connect with the hot radiator 30 that is connected of led light source 10, with led light source 10 is regulated button 50 and one second adjusting button 55.

This led light source 10 comprises the substrate 11 of a circle and is located at the some white light LEDs 12 on this substrate 11.Please consult Fig. 2 simultaneously, said white light LEDs 12 comprises that some colour temperatures are higher, and is lower like a LED121 and the some colour temperatures of 6500k (Kelvin, Kelvin), like the 2nd LED123 of 2800k.During practical implementation, a said LED121 and the 2nd LED123 can adopt cold light source and warm light source respectively, to regulate the colour temperature of these LED lighting device 90 emitted lights in a big way.

This lampshade 20 is the hemisphere shape of hollow, combines closely in the edge of its opening and substrate 11.The common receiving space that forms roughly sealing is in order to be contained in its inside with said LED12 between lampshade 20 and the substrate 11.

The material that this radiator 30 adopts the tool high thermal conductivity coefficients, for example metal such as aluminium, gold, silver, copper or its alloy are processed.This radiator 30 comprises that second end face 32 and of the circle that first end face 31, a diameter of circle that a diameter is bigger is less is connected in the side 33 of said first, second end face 31, the taper between 32.This led light source 10 is positioned on first end face 31 of this radiator 30.The upper edge, side of this radiator 30 is axially arranged with some grooves 35, and said groove 35 evenly distributes along the circumferencial direction of radiator 30, and the setting of said groove 35 is in order to increase the area of dissipation of this radiator 30.This side 33 is provided with an opening 36 along the axially extended strip of radiator 30.

First regulates button 50 is contained in this opening 36, and the bearing of trend that can carry over this opening 36 slides up and down, thus the colour temperature of regulating led light source 10 emergent raies.

Second regulates button 55 is positioned at first side of regulating button 50.This second adjusting button 55 can perhaps be rotated counterclockwise around its central axis clockwise, thus the power of regulating led light source 10 emergent raies.

This joint 40 is positioned on second end face 32 of radiator 30.During use, this LED lighting device 90 can provide the lamp socket (figure does not show) of a direct current power supply 60 (Fig. 2) or an AC power 70 (Fig. 3) to be screwed together through this joint 40 and, thereby makes light source 10 obtain the power supply of this dc source 60 or AC power 70.

As shown in Figure 2, the sketch map that connects the circuit 100 of this dc source 60 through joint 40 for this LED lighting device 90.The positive and negative electrode of a said LED121 is connected each other and is formed the first lamp string 101, and the positive and negative electrode of said the 2nd LED123 is connected each other and formed the second lamp string 102.The positive pole of said first, second lamp string 101,102 is connected with the positive pole of this dc source 60 respectively, and one first variable resistance 80 is connected between the negative pole of negative pole and the second lamp string 102 of the first lamp string 101.One the second adjustable resistance device 85 is connected between the negative pole of this first variable resistance 80 and dc source 60.Wherein, first binding post 82 that is positioned at these first variable resistance, 85 opposite ends is connected with the negative pole of the first lamp string 101, and second binding post 83 is connected with the negative pole of the second lamp string 102.The slide plate 81 of first variable resistance 80 is connected with a wherein binding post of the second adjustable resistance device 85, and the slide plate 86 of the second adjustable resistance device 85 is connected with the negative pole of dc source 60.So, the effective resistance part of variable resistance 80 between first binding post 82 and slide plate 81 of winning is connected in series with the first lamp string 101, and the effective resistance part between second binding post 83 and slide plate 81 is connected in series with the second lamp string 102.

The slide plate 81 of this first variable resistance 80 and first is regulated button 50 and is connected.During use, through stirring that this adjusting button 50 carries over that opening 36 slides up and down and the position of the slide plate 81 on this first variable resistance 80 of scalable.When slide plate 81 when first binding post 82 place directions are slided; The resistance of the part of connecting with the first lamp string 101 in this first variable resistance 80 reduces; Corresponding; The resistance of the part of connecting with the second lamp string 102 in this first variable resistance 80 increases; Thereby the electric current of the feasible first lamp string 101 of flowing through increases; A LED121 luminous intensity increases in the first lamp string 101; And the electric current of the second lamp string 102 of flowing through reduces; The 2nd LED123 luminous intensity weakens in the second lamp string 101; Because mixing of the light that the light that the light that sends of this LED lighting device 90 is a LED121 to be sent and the 2nd LED123 send; Therefore, the colour temperature of the light that sends of LED lighting device 90 increases.When slide plate 81 was positioned at an end of close first binding post 82, the colour temperature of the light that this LED lighting device 90 sends was maximum.Opposite; When slide plate 81 when second binding post 83 place directions are slided; The electric current of the first lamp string 101 of flowing through reduces; And the electric current of the second lamp string 102 of flowing through increases; Therefore; A LED121 luminous intensity weakens in the first lamp string 101, and the 2nd LED123 luminous intensity strengthens in the second lamp string 102, makes the colour temperature of the light that this LED lighting device 90 sends weaken.When slide plate 81 was positioned at an end of close second binding post 83, the colour temperature of the light that this LED lighting device 90 sends was minimum.

The slide plate 86 of this second adjustable resistance device 85 and second is regulated button 55 and is connected.During use, through rotating this second position of regulating the slide plate 86 on this second adjustable resistance device 85 of button 55 scalable, thereby regulate the size of total resistance in this circuit 100.Invariant position when the slide plate 81 of first variable resistance 80; And the resistance of the second adjustable resistance device 85 is when increasing; The total current of this circuit 100 of flowing through reduces; Thereby the electric current of feasible the flow through first lamp string 101 and the second lamp string 102 all reduces; Therefore, the intensity of the light that sends of this LED lighting device 90 weakens; On the contrary, when the resistance of this second adjustable resistance device 85 reduced, the intensity of the light that this LED lighting device 90 sends increased.

Shown in Figure 3 is the sketch map that this LED lighting device 90 connects the circuit 200 of AC powers 70 through joint 40, its with first embodiment in the different of circuit 100 be: said first lamp string 101 and the second lamp string, 102 reversed polarity ends are parallelly connected.Particularly; The negative pole of the positive pole of the first lamp string 101 and the second lamp string 102 is connected with an end of AC power 70 jointly; First binding post 82 of first variable resistance 80 is connected with the negative pole of the first lamp string 101, and second binding post 83 of first variable resistance 80 is connected with the positive pole of the second lamp string 102.In the present embodiment; Regulate the colour temperature of these LED lighting device 90 emergent lights and regulate the mode of these LED lighting device 90 outgoing light intensities identical respectively through said first variable resistance 80, do not giving unnecessary details at this with circuit 100 among first embodiment through the second adjustable resistance device 85.

Shown in Figure 4 is the sketch map of the 3rd embodiment of the circuit 300 of this LED lighting device, its with first embodiment in the different of circuit 100 be: AC power 70 is connected with the second lamp string 102 with the first lamp string 101 through a transformer 72 and a bridge rectifier 71 backs.Via said transformer 72 voltage transitions of AC power 70 is become the voltage of required size, after bridge rectifier 71 carries out rectification, make again and need not distinguish positive and negative electrode when this AC power 70 connects loads.In the present embodiment; The anodal of the said first lamp string 101 and the second lamp string 102 all is connected with an end of this bridge rectifier 71, and first, second binding

post

82,83 of first variable resistance 80 is connected between the negative pole of negative pole and the second lamp string 102 of the first lamp string 101.Understandable; This circuit 300 also can be that the negative pole of the first lamp string 101 and the second lamp string 102 all is connected with an end of bridge rectifier 71, and first, second binding

post

82,83 of this first variable resistance 80 is connected between the positive pole of the anodal and second lamp string 102 of the first lamp string 101.

In sum; The circuit 100 of this this LED lighting device; 200; The first lamp string 101 and the second lamp string 102 are connected in parallel in 300; The effective resistance of the part of first variable resistance 80 and the first lamp string 101 are connected in series; Another live part resistance second lamp string 102 is connected in series; And LED lighting device 90 comprises the adjusting button 50 that is used for regulating this variable resistance 80 resistances size; Regulate button 50 and slide up and down when regulating the effective resistance increase of a part (reducing) that first variable resistance 80 connects with the first lamp string 101 through stirring; The effective resistance of another part of connecting with the second lamp string 102 reduces (increase); Flow through when the electric current of therefore regulating this first lamp string 101 of flowing through reduces (increases) the electric current increase (reducing) of the second lamp string 102, thereby the colour temperature of regulating these LED lighting device 90 emergent lights.

Claims

1 An LED lighting device including a first light strings are connected in parallel and a second string lights, each light string includes at least one series each LED, the characterized in that: the LED illumination device further includes a connection to the first light and a second light string string between a variable resistor, the resistance of the variable resistor portion of the first lamp are connected in strings, and the other strings of the resistance is connected to the second lamp, by changing the variable resistor the position of the vane, so that the flow through said first and second light string light strings in one of the lamp current increases, while the string through the string of another lamp current decreases, to adjust the LED illumination apparatus color temperature of light.

2. LED lighting device as claimed in claim 1; It is characterized in that: the positive pole of the said first lamp string and the second lamp string is connected with the positive pole of a direct current power supply; Two binding posts of this variable resistance are connected between the negative pole of negative pole and the second lamp string of the first lamp string, and the slide plate of variable resistance is connected with the negative pole of dc source.

3. LED lighting device as claimed in claim 2; It is characterized in that: comprise that also one is connected in another variable resistance between the negative pole of slide plate and dc source of variable resistance; Change the position of the slide plate of this another variable resistance, thereby the electric current in feasible the flow through first lamp string and the second lamp string increases simultaneously or reduces.

4. LED lighting device as claimed in claim 1; It is characterized in that: the negative pole of the positive pole of the said first lamp string and the second lamp string is connected with an end of an AC power; Two binding posts of this variable resistance are connected between the positive pole of negative pole and the second lamp string of the first lamp string, and the slide plate of variable resistance is connected with the other end of this AC power.

5. LED lighting device as claimed in claim 4; It is characterized in that: comprise that also one is connected in another variable resistance between the other end of slide plate and AC power of variable resistance; Change the position of the slide plate of this another variable resistance, thereby the electric current in feasible the flow through first lamp string and the second lamp string increases simultaneously or reduces.

6. LED lighting device as claimed in claim 1; It is characterized in that: the anodal of the said first lamp string and the second lamp string all is connected with an end of a bridge rectifier; Two binding posts of this variable resistance are connected between the negative pole of negative pole and the second lamp string of the first lamp string, and the slide plate of variable resistance is connected with the other end of bridge rectifier.

7. LED lighting device as claimed in claim 6; It is characterized in that: comprise that also one is connected in another variable resistance between the other end of slide plate and bridge rectifier of this variable resistance; Change the position of the slide plate of this another variable resistance, thereby the electric current in feasible the flow through first lamp string and the second lamp string increases simultaneously or reduces.

8. like any described LED lighting device of claim 1 to 7; It is characterized in that: also comprise a hot radiator that is connected with LED; This radiator is provided with the opening of a strip; This adjusting button is contained in the opening and can carries over this opening and slides, and stirs that this adjusting button slides and the position that changes the slide plate of this variable resistance in opening.

9. like any described LED lighting device of claim 1 to 7, it is characterized in that: the colour temperature of the LED emitted light in this first lamp string is greater than the colour temperature of the LED emitted light in this second lamp string.