CN101737643B - Light-emitting device - Google Patents
Light-emitting device Download PDFInfo
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- CN101737643B CN101737643B CN200910133991XA CN200910133991A CN101737643B CN 101737643 B CN101737643 B CN 101737643B CN 200910133991X A CN200910133991X A CN 200910133991XA CN 200910133991 A CN200910133991 A CN 200910133991A CN 101737643 B CN101737643 B CN 101737643B
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- emitting diode
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Abstract
A light-emitting device comprises a light-emitting diode (LED) module, a detecting circuit and a control circuit. The LED module is used for receiving variable voltage. The detecting circuit is used for detecting the light-emitting state of the LED module and outputting control signals. The control circuit is electrically connected with the LED module and is used for adjusting the quantity of the conducted LEDs in the LED module according to the control signals. Compared with the prior art, the invention is characterized in that the LED module operates in the preset state by changing the quantity of the conducted LEDs, thus the light-emitting device can be driven by a variable power source and simultaneously avoid power loss in the current-limiting components to elevate the use efficiency of the power.
Description
Technical field
The present invention relates to a kind of light-emitting device.
Background technology
(Light-Emitting Diode LED), is a kind of semiconductor element to light emitting diode, many at the beginning light sources as indicator lamp and outdoor display board.Because light emitting diode has long and conventional light source such as the cracky advantage that is beyond one's reach not of efficient height, life-span, therefore, light emitting diode is described as the new type light source of 21st century.
Is example with light emitting diode as the light-emitting device of light source, and generally speaking its control method can be divided into constant voltage control and constant current control.Please with reference to shown in Figure 1A, the light-emitting device 1A of known constant voltage control comprises light-emitting diode (LED) module 11, capacitor 12, a plurality of resistor 13 and stiff 14.In order to make the signal of importing light emitting diode is the constant voltage signal, and the designer must adopt the capacitor of big capacitance usually, or comparatively complicated rectification circuit, reaches the effect of voltage stabilizing whereby, thereby can increase manufacturing cost.
Though constant voltage control has easy circuit design advantage, constant voltage control also can't provide stable electric current.Because light emitting diode is to borrow combining of electronics and electric hole, and the energy of surplus is disengaged with the form of light, reaches luminous effect.Therefore, the change of electric current will have great influence to the characteristics of luminescence of light emitting diode.Promptly be that constant voltage control can't be controlled the characteristics of luminescence of light emitting diode accurately.
In addition, please with reference to shown in Figure 1B, the light-emitting device 1B of known constant current control comprises light-emitting diode (LED) module 11, capacitor 12, a plurality of resistor 13, constant current supply 15 and detecting unit 16.Though; Known constant current control can provide light emitting diode stable electric current, but in the utilization of reality, in order to overcome the current difference that produces because of the difference between each light emitting diode; Still must use resistor 13 as the current limliting assembly; To absorb because of electrically changing the power difference that causes with stabling current, thus, with causing extra power attenuation.
Yet, no matter be the light-emitting device of known constant voltage control or the light-emitting device of known constant current control, all need the feeding unit that stabilized power source can be provided.Therefore, how a kind of light-emitting device is provided, it can be driven through variable power supply, can avoid power attenuation at the current limliting assembly again simultaneously,, become one of important topic with the service efficiency of hoisting power.
Summary of the invention
The purpose of this invention is to provide a kind of can the driving, simultaneously can avoid power attenuation again, with the light-emitting device of the service efficiency of hoisting power at the current limliting assembly through variable power supply.
The present invention can adopt following technical scheme to realize.
A kind of light-emitting device of the present invention comprises a light-emitting diode (LED) module, a circuit for detecting and a control circuit.Light-emitting diode (LED) module receives a variable voltage, and comprises one first light emitting diode, one second light emitting diode and one the 3rd light emitting diode that is connected in series;
One circuit for detecting; Have one first detecting unit and one second detecting unit; Wherein this first detecting unit and this first light emitting diode electrically connect; And detect the luminance of this first light emitting diode, this second detecting unit and this second light emitting diode electrically connect, and detect the luminance of this second light emitting diode; And
One control circuit; Have one first switch unit, one second switch unit, one first control module and one second control module; Wherein this first switch unit and this second light emitting diode electrically connect; And this first control module is according to the luminance of this first light emitting diode; Control this first switch unit to adjust the quantity of the light emitting diode of conducting in this second light emitting diode; This second switch unit and the 3rd light emitting diode electrically connect, and this second control module is controlled this second switch unit to adjust the quantity of the light emitting diode of conducting in the 3rd light emitting diode according to the luminance of this second light emitting diode.
Aforesaid light-emitting device, wherein said variable voltage are alternating voltage or DC voltage.
Aforesaid light-emitting device, wherein said DC voltage are that said alternating voltage produces via a rectification circuit.
Aforesaid light-emitting device, the luminance of wherein said light-emitting diode (LED) module are the current value of said light-emitting diode (LED) module, magnitude of voltage, electrical power or its combination.
Aforesaid light-emitting device, wherein said circuit for detecting comprises a resistor.
Aforesaid light-emitting device, wherein said control circuit are a digital control circuit or an analog control circuit.
Aforesaid light-emitting device, wherein said circuit for detecting or said control circuit are integrated circuits, or said circuit for detecting and said control circuit are integrated circuits.
Aforesaid light-emitting device, wherein said first light emitting diode does not receive the control of said control circuit.
Aforesaid light-emitting device, wherein when said control circuit comprised a plurality of switch unit, said switch unit was in series or in parallel with each other.
By technique scheme, this present invention's light-emitting device has advantage at least:
According to the quantity of a kind of light-emitting device of the present invention through the light emitting diode of conducting in the control circuit adjustment light-emitting diode (LED) module.Compared to known techniques; The present invention can be by the quantity of the light emitting diode that changes conducting; Make light-emitting diode (LED) module operate in a preset state; Thereby realize and to drive through variable power supply, can avoid power attenuation at the current limliting assembly again simultaneously, with the light-emitting device of the service efficiency of hoisting power.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; To understand technological means of the present invention in order can more knowing, and can to implement, and understand technological means of the present invention in order can more to know according to the content of specification; And for let above and other objects of the present invention, feature and advantage can be more obviously understandable; Hereinafter is special lifts preferred embodiment, and conjunction with figs., elaborates as follows.
Description of drawings
Figure 1A is the intention of the light-emitting device of known constant voltage control;
Figure 1B is the intention of the light-emitting device of known constant current control;
Fig. 2 is the sketch map of a kind of light-emitting device of the preferred embodiment of the present invention;
Fig. 3 is the sketch map of a kind of light-emitting device of the preferred embodiment of the present invention;
Fig. 4 A to Fig. 4 D is that the light-emitting device of present embodiment has the different sketch mapes that change aspect; And
Fig. 5 A and Fig. 5 B are the sketch mapes of a kind of light-emitting device of the preferred embodiment of the present invention and the alternating voltage that is used thereof.
The primary clustering symbol description:
1A, 1B, 2,3,4A, 4B, 4C, 4D, 5: light-emitting device
11,21,31,41A, 41B, 51: light-emitting diode (LED) module
12: capacitor
13: resistor
14: stiff
15: constant current supply
16,221: detecting unit
211,411,511A, 511B, 511C, 511D: light emitting diode
311: the first light emitting diodes
312,412: the second light emitting diodes
22,32,42,52: circuit for detecting
23,33,43A, 43B, 53: control circuit
331,431: switch unit
332,432: control module
413: the three light emitting diodes
421: the first detecting units
422: the second detecting units
433,531A: first switch unit
434,531B: second switch unit
435: the first control modules
436: the second control modules
531C: the 3rd switch unit
R1: first section
R2: second section
R3: the 3rd section
R4: the 4th section
S
C: the control signal
V: variable voltage
The specific embodiment
Below will a kind of light-emitting device according to the preferred embodiment of the present invention be described with reference to correlative type.
Please with reference to shown in Figure 2, Fig. 2 is the sketch map of a kind of light-emitting device of the preferred embodiment of the present invention.Light-emitting device 2 comprises a light-emitting diode (LED) module 21, a circuit for detecting 22 and a control circuit 23.
Light-emitting diode (LED) module 21 comprises the light emitting diode 211 of a plurality of series connection, and light emitting diode 211 comprises at least one light emitting diode respectively.Light-emitting diode (LED) module 21 is in order to receive a variable voltage V.
In the present embodiment, variable voltage V can be alternating voltage or DC voltage, and variable voltage V is along with the time can be with periodicity or its accurate position voltage of change at random, that is, variable voltage V is unfixed voltage.Wherein, aforesaid alternating voltage can be the civil power of generally knowing, and is the alternating current of 90V to 250V, also can be the alternating current of being exported by power supply changeover device.In addition, aforesaid DC voltage comprises the voltage that produces via a rectification circuit through battery, storage battery or alternating voltage.Wherein, with making the accurate position of output voltage produce change, in addition, then still there are ripple in battery and storage battery via the DC voltage that rectification circuit produced because of the increase of service time.Therefore, on practice, the standard of this type of DC voltage position still can change along with the time.
The luminance of circuit for detecting 22 detecting light-emitting diode (LED) modules 21, and export a control signal S
COn the implementation, circuit for detecting 22 can comprise a resistor, an optical detector, a light sensitive diode (photodiode), an induction coil, an electromagnetic induction assembly or a magnetoelectric induction assembly or its combination.On practice, the annexation between circuit for detecting 22 and the light-emitting diode (LED) module 21 can adopt the mode that couples or electrically connect according to the circuit for detecting of being selected for use 22.In addition, circuit for detecting 22 can be an integrated circuit.
In addition, in the kind of the luminance of this so-called light-emitting diode (LED) module, for example be current value, magnitude of voltage, electrical power, luminous intensity or luminous power or its combination of light-emitting diode (LED) module.In other words, on the implementation, circuit for detecting 22 can have multiple variation aspect according to the needs of the demand of different product or in fact design.
Then, please with reference to shown in Figure 3, to further specify light-emitting device of the present invention.The light-emitting diode (LED) module 31 of light-emitting device 3 comprises one first light emitting diode 311 and one second light emitting diode 312 that is connected in series each other.In the present embodiment, light-emitting diode (LED) module 31 receives a variable voltage V, to drive first light emitting diode 311 and second light emitting diode 312.
In addition, on the implementation, the light emitting diode in first light emitting diode 311 and second light emitting diode 312 can be to be connected in series earlier, is connected in parallel, or is connected in parallel earlier, is connected in series again.
The circuit for detecting 32 and second light emitting diode 312 electrically connect, and detect the current value of second light emitting diode 312 of flowing through, to produce a control signal S
CIn the present embodiment, circuit for detecting 32 comprises a resistor.
In the present embodiment, judge control signal S through control module 332
CWhether less than a default value, and control module 332 will control switch unit 331 according to judged result, make switch unit 331 operate in conducting or cut-off state.That is, control circuit 33 can be according to control signal S
C, end or conducting second light emitting diode 312, make light-emitting diode (LED) module 31 operate in a predetermined current value.
Be noted that, in the present embodiment, the control of first light emitting diode 311 and uncontrolled unit 33, and circuit for detecting 32 can be a detecting real-time circuit.At this, so-called uncontrolledly controlled by power supply by first the whether luminous of light emitting diode 311, the start of control circuit 33 will directly not influence the whether luminous of first light emitting diode 311, and right, both still have annexation electrically.
Through above-mentioned hardware structure, the present invention can pass through the quantity of the light emitting diode of change conducting, make light-emitting diode (LED) module operate in a preset state.Thus, light-emitting device of the present invention will not be subject to power-supply unit one stable power must be provided.
In addition, on practice, the framework of control circuit can have different variation aspects according to different demands, below please with reference to Fig. 4 A to Fig. 4 D, illustrates four kinds of application architectures of control circuit.
Shown in Fig. 4 A, the light-emitting diode (LED) module 41 of light-emitting device 4A comprises the light emitting diode 411 of a plurality of series connection, and control circuit 43A comprises a plurality of switch units 431.Wherein, each switch unit 431 electrically connects with corresponding light emitting diode 411 respectively, and each switch unit 431 is connection parallel with one another.Shown in Fig. 4 B, the difference of light-emitting device 4B and light-emitting device 4A is: each switch unit 431 among the control circuit 43B is for be connected in series each other.
On practice, control module 432 can comprise an offset buffer and a comparator.Wherein, offset buffer electrically connects with each switch unit 431 respectively, and comparator electrically connects with offset buffer and circuit for detecting 42 respectively, and receives the control signal that is produced by circuit for detecting 42.Whether control circuit 432 will judge the control signal less than a default value through comparator, and according to each switch unit 431 of judged result control, to end respectively or each light emitting diode 411 of conducting, make light-emitting diode (LED) module 41 operate in a predetermined current value.
Then, please with reference to Fig. 4 C.Present embodiment explains that for ease having three light emitting diodes with light-emitting diode (LED) module is example.Yet, be not as limit.
The circuit for detecting of light-emitting device 4C comprises one first detecting unit 421 and one second detecting unit 422.First detecting unit 421 and second light emitting diode 412 electrically connect, and detect the luminance of second light emitting diode 412.Second detecting unit 422 and the 3rd light emitting diode 413 electrically connect, and detect the luminance of the 3rd light emitting diode 413.
Control circuit comprises one first switch unit 433, one second switch unit 434, one first control module 435 and one second control module 436.First switch unit 433 and second light emitting diode 412 electrically connect.First control module, 435 foundations are the luminance of second light emitting diode 412 mutually, and adjusts the quantity of the light emitting diode of conductings in second light emitting diode 412.
In addition, second switch unit 434 and the 3rd light emitting diode 413 electrically connect.Second control module 436 is adjusted the quantity of the light emitting diode of conductings in the 3rd light emitting diode 413 according to the luminance of phase the 3rd light emitting diode 413.
In the present embodiment, detecting unit is adjusted the quantity of the light emitting diode of conducting in the aforesaid light emitting diode according to the luminance of the light emitting diode of being detected.In other words, control module is according to the control signal of exporting with the detecting unit of one-level, and adjustment is with the light emitting diode of one-level.
Please with reference to Fig. 4 D, the difference of light-emitting device 4D and light-emitting device 4C is: the control signal that control module is exported according to the detecting unit of previous stage, adjustment is with the light emitting diode of one-level.
Then, please with reference to shown in Fig. 5 A and Fig. 5 B, in the time of below will further specifying light-emitting device 5 and operate in alternating voltage, a kind of mode of adjusting the quantity of light emitting diode.In addition, present embodiment is to be example to decide electric current (80mA) through all light emitting diodes, yet this is nonrestrictive.
In the present embodiment, variable voltage V is an alternating voltage shown in Fig. 5 B.Wherein, variable voltage V can divide into four sections by low pressure to high pressure.During the first section R1, the work period of light-emitting diode (LED) module, (Duty) was 85%; During the second section R2, the work period of light-emitting diode (LED) module is 70%; During the 3rd section R3, the work period of light-emitting diode (LED) module is 50%; During the 4th section R4, the work period of light-emitting diode (LED) module is 25%.
As shown in Figure 5, the light-emitting diode (LED) module 51 of light-emitting device 5 comprises four the light emitting diode 511A, 511B, 511C, the 511D that are connected in series.Wherein, light emitting diode 511A, 511B, 511C comprise four, three and two light emitting diodes that are connected in parallel respectively.
Circuit for detecting 52 electrically connects with control module 532, and the variation of the voltage quasi position of detecting variable voltage V.When the voltage quasi position of variable voltage V is position during at the first section R1, light emitting diode 511A is luminous according to the variable voltage V that is received; When the voltage quasi position of variable voltage V is position during at the second section R2, circuit for detecting 52 outputs control signals to control module 532, with by the first change-over switch 531A, conducting light emitting diode 511A, 511B; When the voltage quasi position of variable voltage V is position during at the 3rd section R3, circuit for detecting 52 outputs control signals to control module 532, with by the first change-over switch 531A and the second change-over switch 531B, conducting light emitting diode 511A～511C; When the voltage quasi position of variable voltage V is that the position is during at the 4th section R4; Circuit for detecting 52 outputs control signals to control module 532; To end the first change-over switch 531A, the second change-over switch 531B and the 3rd change-over switch 531C, conducting light emitting diode 511A～511D.
In other words, voltage quasi position is when the first section R1, and the electric current of each light emitting diode of the light emitting diode 511A that flows through is 20mA; Voltage quasi position is when the second section R2, and the electric current of each light emitting diode of the newly-increased light emitting diode 511B that flows through is 26.6mA; Voltage quasi position is when the 3rd section R3, and the electric current of each light emitting diode of the newly-increased light emitting diode 511C that flows through is 40mA again; Voltage quasi position is when the 4th section R4, and the electric current of the light emitting diode of the newly-increased light emitting diode 511D that flows through is 80mA again.At this moment, in the time, the power output of each light emitting diode 511A～511D ratio will be 17: 18.62: 20: 20 at one-period.
In practical operation, also can in the circuit of light-emitting device, add electric capacity, with the work period that prolongs first section and second section be 100% and 75%, and then the power output that makes each light emitting diode is than forming 20: 20: 20: 20.
Through hardware configuration shown in Figure 5, the present invention can make each light emitting diode have close or identical power output through changing the quantity of the light emitting diode of conducting in each light emitting diode.
In addition, what deserves to be mentioned is that the present invention does not limit light emitting diode quantity included in each light emitting diode, and in the light-emitting diode (LED) module, the uncontrolled circuit control of at least one light emitting diode.In addition, light-emitting device of the present invention can be a backlight or a lighting device, and can be applicable to the lighting field and the general illumination application of field of mobile communication, transport facility.
In sum, because of according to light-emitting device of the present invention, adjust the quantity of the light emitting diode of conducting in the light-emitting diode (LED) module through control circuit.Compared to known techniques; The present invention can pass through the quantity of the light emitting diode of change conducting; Make light-emitting diode (LED) module operate in a preset state; Thereby realize and to drive through variable power supply, can avoid power attenuation at the current limliting assembly again simultaneously, with the light-emitting device of the service efficiency of hoisting power.
The above is merely illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be included in the claim of the present invention its equivalent modifications of carrying out or change.
Claims (8)
1. a light-emitting device is characterized in that, comprising:
One light-emitting diode (LED) module in order to receiving a variable voltage, and comprises one first light emitting diode, one second light emitting diode and one the 3rd light emitting diode that is connected in series;
One circuit for detecting; Have one first detecting unit and one second detecting unit; Wherein this first detecting unit and this first light emitting diode electrically connect; And detect the luminance of this first light emitting diode, this second detecting unit and this second light emitting diode electrically connect, and detect the luminance of this second light emitting diode; And
One control circuit; Have one first switch unit, one second switch unit, one first control module and one second control module; Wherein this first switch unit and this second light emitting diode electrically connect; And this first control module is according to the luminance of this first light emitting diode; Control this first switch unit to adjust the quantity of the light emitting diode of conducting in this second light emitting diode; This second switch unit and the 3rd light emitting diode electrically connect, and this second control module is controlled this second switch unit to adjust the quantity of the light emitting diode of conducting in the 3rd light emitting diode according to the luminance of this second light emitting diode.
2. light-emitting device according to claim 1 is characterized in that, said variable voltage is alternating voltage or DC voltage.
3. light-emitting device according to claim 2 is characterized in that, said DC voltage is that said alternating voltage produces via a rectification circuit.
4. light-emitting device according to claim 1 is characterized in that, the luminance of said light-emitting diode (LED) module is the current value of said light-emitting diode (LED) module, magnitude of voltage, electrical power or its combination.
5. light-emitting device according to claim 1 is characterized in that said circuit for detecting comprises a resistor.
6. light-emitting device according to claim 1 is characterized in that, said control circuit is a digital control circuit or an analog control circuit.
7. light-emitting device according to claim 1 is characterized in that, said circuit for detecting or said control circuit are integrated circuits, or said circuit for detecting and said control circuit are integrated circuits.
8. light-emitting device according to claim 1 is characterized in that said first light emitting diode does not receive the control of said control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910133991XA CN101737643B (en) | 2008-11-13 | 2009-04-22 | Light-emitting device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810181450.X | 2008-11-13 | ||
| CN200810181450 | 2008-11-13 | ||
| CN200910133991XA CN101737643B (en) | 2008-11-13 | 2009-04-22 | Light-emitting device |
Publications (2)
| Publication Number | Publication Date |
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| CN101737643A CN101737643A (en) | 2010-06-16 |
| CN101737643B true CN101737643B (en) | 2012-02-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910133991XA Expired - Fee Related CN101737643B (en) | 2008-11-13 | 2009-04-22 | Light-emitting device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338294A (en) * | 2010-07-21 | 2012-02-01 | 江苏苏能光电科技有限责任公司 | Integrated LED (Light-emitting Diode) light source suitable for alternating current direct driving |
| CN103249201A (en) * | 2012-02-06 | 2013-08-14 | 光宝电子(广州)有限公司 | Light emitting diode circuit and light emitting device thereof |
| CN106332380B (en) * | 2015-06-17 | 2018-11-30 | 芯京源微电子(合肥)有限公司 | Light emission drive circuit and light emitting device |
| CN113241583B (en) * | 2021-05-06 | 2023-06-30 | Oppo广东移动通信有限公司 | Optical signal transmitting device, optical signal sensor and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040080273A1 (en) * | 2002-10-08 | 2004-04-29 | Masayasu Ito | Lighting circuit |
| CN1816234A (en) * | 2006-02-25 | 2006-08-09 | 孙志揩 | Stable long-acting lighting indication device for light-emitting diode |
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| US20080116817A1 (en) * | 2006-11-16 | 2008-05-22 | Han-Yu Chao | Controlling apparatus for controlling a plurality of led strings and related light modules |
-
2009
- 2009-04-22 CN CN200910133991XA patent/CN101737643B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040080273A1 (en) * | 2002-10-08 | 2004-04-29 | Masayasu Ito | Lighting circuit |
| CN1816234A (en) * | 2006-02-25 | 2006-08-09 | 孙志揩 | Stable long-acting lighting indication device for light-emitting diode |
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| US20080116817A1 (en) * | 2006-11-16 | 2008-05-22 | Han-Yu Chao | Controlling apparatus for controlling a plurality of led strings and related light modules |
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| CN101737643A (en) | 2010-06-16 |
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Granted publication date: 20120229 Termination date: 20140422 |