CN101871582A - Light-emitting device - Google Patents
Light-emitting device Download PDFInfo
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- CN101871582A CN101871582A CN200910133990A CN200910133990A CN101871582A CN 101871582 A CN101871582 A CN 101871582A CN 200910133990 A CN200910133990 A CN 200910133990A CN 200910133990 A CN200910133990 A CN 200910133990A CN 101871582 A CN101871582 A CN 101871582A
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Abstract
The invention relates to a light-emitting device which comprises a light-emitting diode module, a detection circuit and a control circuit, wherein the light-emitting diode module receives a variable voltage; the detection circuit detects the voltage level of the variable voltage and outputs a control signal based on the voltage level; and the control circuit is respectively electrically connected with the detection circuit and the light-emitting diode module and adjusts the quantity of light-emitting diodes conducted in the light-emitting diode module based on the control signal. Compared with the prior art, the light-emitting device enables the light-emitting diode module to operate in a preset state by changing the quantity of the conducted light-emitting diodes, so that the light-emitting device can realize the driving operation by using a variable power supply and can prevent power from being lost at the current limiting assembly to improve the service 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, so light emitting diode is used to the electronic product of numerous species widely.
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 refer 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 refer 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, thus, extra power attenuation will be caused because of electrically changing the power difference that causes with stabling current.
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 a feeding unit that stabilized power source can be provided.Therefore, how to provide a kind of light-emitting device, it can be driven by 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 by variable power supply.
The present invention can realize by the following technical solutions.
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.One voltage quasi position of circuit for detecting detecting variable voltage, and according to voltage quasi position output one control signal.Control circuit electrically connects with circuit for detecting and light-emitting diode (LED) module respectively, and adjusts the quantity of the light emitting diode of conducting in the light-emitting diode (LED) module according to the control signal.
Aforesaid light-emitting device, wherein said variable voltage are alternating voltage or DC voltage.
Aforesaid light-emitting device, wherein said DC voltage are that described alternating voltage produces via a rectification circuit.
Aforesaid light-emitting device, wherein said circuit for detecting comprise a resistor or a comparator.
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 described control circuit are integrated circuits, perhaps described circuit for detecting and described control circuit are integrated circuits.
Aforesaid light-emitting device, wherein said light-emitting diode (LED) module comprises the light emitting diode of a plurality of series connection, and described light emitting diode comprises at least one light emitting diode respectively.
Aforesaid light-emitting device, wherein at least one light emitting diode comprises a plurality of light emitting diodes that are connected in parallel.
Aforesaid light-emitting device, wherein at least one light emitting diode is not subjected to the control of described control circuit.
Aforesaid light-emitting device, wherein said control circuit comprises: at least one switch unit electrically connects with corresponding described light emitting diode; And at least one control module, electrically connect with described switch unit, and, adjust the quantity of the light emitting diode of conducting in the corresponding described light emitting diode via described switch unit according to described control signal.
By technique scheme, this present invention's light-emitting device has following advantage at least:
Adjust the quantity of the light emitting diode of conducting in the light-emitting diode (LED) module by control circuit according to a kind of light-emitting device of the present invention.With known art, the present invention can pass through the quantity of the light emitting diode of change conducting, and make light-emitting diode (LED) module operate in a preset state, thereby realize and to drive by variable power supply, simultaneously can avoid power attenuation again, with the light-emitting device of the service efficiency of hoisting power at the current limliting assembly.
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 schematic diagram of a kind of light-emitting device of the preferred embodiment of the present invention;
Fig. 3 is the schematic diagram of a kind of light-emitting device of the preferred embodiment of the present invention;
Fig. 4 A to Fig. 4 B is that the light-emitting device of present embodiment has the different schematic diagrames that change aspect; And
Fig. 5 is the schematic diagram of the alternating voltage that is used of light-emitting device of the present invention.
The primary clustering symbol description:
1A, 1B, 2,3,4A, 4B: light-emitting device
11,21,31,41A, 41B: light-emitting diode (LED) module
12: capacitor
13: resistor
14: stiff
15: constant current supply
16: detecting unit
211,411,411A, 411B, 411C, 411D: light emitting diode
22,32,42: circuit for detecting
23,33,43: control circuit
311: the first light emitting diodes
312: the second light emitting diodes
331: switch unit
332,432: control module
431: switch unit
431A: first switch unit
431B: second switch unit
431C: 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
Hereinafter with reference to correlative type, a kind of light-emitting device according to the preferred embodiment of the present invention is described.
Please refer to shown in Figure 2ly, Fig. 2 is the schematic diagram 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 receives a variable voltage V.In the present embodiment, 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.
In the present embodiment, variable voltage V can be an alternating voltage or a direct current voltage, and variable voltage V is that promptly variable voltage V is unfixed voltage along with the time can be with periodicity or its accurate position voltage of change at random.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 is produced via a rectification circuit by 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 accurate position of this type of DC voltage still can change along with the time.
The voltage quasi position of circuit for detecting 22 detecting variable voltage V, and according to voltage quasi position output one control signal S
COn the implementation, circuit for detecting 22 can comprise a resistor or a comparator.In addition, circuit for detecting 22 also can be according to the needs of the demand of different product or in fact design to be an integrated circuit.In addition, on practice, circuit for detecting 22 can be a detecting real-time circuit, the variation of the voltage quasi position of detecting real-time variable voltage V whereby.
Then, please refer to shown in Figure 3, to further specify light-emitting device of the present invention.In the present embodiment, light-emitting diode (LED) module 31 comprises one first light emitting diode 311 and one second light emitting diode 312 that is connected in series mutually.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.
In the present embodiment, be to judge control signal S by 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 is detecting real-time circuit.At this, so-called uncontrolled be that first the whether luminous of light emitting diode 311 controlled by power supply, the start of control circuit 33 will directly not influence the whether luminous of first light emitting diode 311, and is right, both still have annexation electrically.
By above-mentioned hardware structure, the variation of the voltage quasi position that the present invention can detecting real-time variable voltage V changes the quantity of the light emitting diode of conducting, so that light-emitting diode (LED) module operates in a preset state, and then the service efficiency of hoisting power.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 refer to Fig. 4 A and Fig. 4 B, illustrates two kinds of application architectures of control circuit.
Shown in Fig. 4 A, present embodiment for convenience of description, having four light emitting diodes with light-emitting diode (LED) module is example.Yet this is nonrestrictive.
Light-emitting diode (LED) module 41A comprises four light emitting diodes that are connected in series 411.Control circuit 43 comprises a plurality of switch units 431 and a control module 432.Wherein, each switch unit 431 electrically connects with corresponding light emitting diode 411 respectively, and each switch unit 431 is connections parallel with one another.In addition, control module 432 electrically connects with circuit for detecting 42.
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 S that is produced by circuit for detecting 42
C Control circuit 432 will be judged control signal S by comparator
CControl each switch unit 431 whether less than a default value, and according to judged result, with respectively by or each light emitting diode 411 of conducting, make light-emitting diode (LED) module 41A operate in a predetermined current value.
Then, please refer to Fig. 4 B and Fig. 5, in the time of below will further specifying light-emitting device 4B and operate in alternating voltage, a kind of mode of adjusting the quantity of light emitting diode.In addition, present embodiment is example with constant current (80mA) by all light emitting diodes, yet this is nonrestrictive.
In the present embodiment, variable voltage V is an alternating voltage as shown in Figure 5.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%.
Shown in Fig. 4 B, the light-emitting diode (LED) module 41B of light-emitting device 4B comprises four light emitting diode 411A, the 411B, 411C, the 411D that are connected in series.Wherein, light emitting diode 411A, 411B, 411C comprise four, three and two light emitting diodes that are connected in parallel respectively.
Circuit for detecting 42 electrically connects with control module 432, and the variation of the voltage quasi position of detecting variable voltage V.When the voltage quasi position of variable voltage V is when being positioned at the first section R1, light emitting diode 411A is luminous according to the variable voltage V that is received; When the voltage quasi position of variable voltage V is that circuit for detecting 42 outputs control signals to control module 432 when being positioned at the second section R2,, come conducting light emitting diode 411A, 411B with by the first switch unit 431A; When the voltage quasi position of variable voltage V is that circuit for detecting 42 outputs control signals to control module 432 when being positioned at the 3rd section R3,, come conducting light emitting diode 411A～411C with by the first switch unit 431A and the second switch unit 431B; When the voltage quasi position of variable voltage V is when being positioned at the 4th section R4, circuit for detecting 42 outputs control signals to control module 432, with by the first switch unit 431A, the second switch unit 431B and the 3rd switch unit 431C, come conducting light emitting diode 411A～411D.
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 411A 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 411B 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 411C 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 411D that flows through is 80mA again.At this moment, in the time, the power output of each light emitting diode 411A～411D ratio will be 17: 18.62: 20: 20 at one-period.
In practical operation, more can in the circuit of light-emitting device, add electric capacity, with the work period to 100% and 75% that prolongs first section and second section, and then make the power output ratio of each light emitting diode form 20: 20: 20: 20.
By the hardware configuration shown in Fig. 4 B, the present invention can make each light emitting diode have close or identical power output by 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 the connected mode of the light emitting diode in each light emitting diode.In addition, light-emitting device of the present invention is 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 by control circuit.With known art, 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 by variable power supply, simultaneously can avoid power attenuation again, with the light-emitting device of the service efficiency of hoisting power at the current limliting assembly.
The above only is an 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 (11)
1. a light-emitting device is characterized in that, comprising:
One light-emitting diode (LED) module receives a variable voltage;
One circuit for detecting is detected a voltage quasi position of described variable voltage, and is exported one according to described voltage quasi position and control signal; And
One control circuit electrically connects with described circuit for detecting and described light-emitting diode (LED) module respectively, and adjusts the quantity of the light emitting diode of conducting in the described light-emitting diode (LED) module according to described control signal.
2. light-emitting device according to claim 1 is characterized in that, described variable voltage is alternating voltage or DC voltage.
3. light-emitting device according to claim 2 is characterized in that, described DC voltage is that described alternating voltage produces via a rectification circuit.
4. light-emitting device according to claim 1 is characterized in that, described circuit for detecting comprises a resistor or a comparator.
5. light-emitting device according to claim 1 is characterized in that, described control circuit is a digital control circuit or an analog control circuit.
6. light-emitting device according to claim 1 is characterized in that, described circuit for detecting or described control circuit are integrated circuits, and perhaps described circuit for detecting and described control circuit are integrated circuits.
7. light-emitting device according to claim 1 is characterized in that described light-emitting diode (LED) module comprises the light emitting diode of a plurality of series connection, and described light emitting diode comprises at least one light emitting diode respectively.
8. light-emitting device according to claim 7 is characterized in that, at least one light emitting diode comprises a plurality of light emitting diodes that are connected in parallel.
9. light-emitting device according to claim 7 is characterized in that at least one light emitting diode is not subjected to the control of described control circuit.
10. light-emitting device according to claim 7 is characterized in that, described control circuit comprises:
At least one switch unit electrically connects with corresponding described light emitting diode; And
At least one control module electrically connects with described switch unit, and according to described control signal, adjusts the quantity of the light emitting diode of conducting in the corresponding described light emitting diode via described switch unit.
11. light-emitting device according to claim 10 is characterized in that, when described control circuit comprised a plurality of switch unit, described switch unit was in series or in parallel with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910133990A CN101871582A (en) | 2009-04-22 | 2009-04-22 | Light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910133990A CN101871582A (en) | 2009-04-22 | 2009-04-22 | Light-emitting device |
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| Publication Number | Publication Date |
|---|---|
| CN101871582A true CN101871582A (en) | 2010-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910133990A Pending CN101871582A (en) | 2009-04-22 | 2009-04-22 | Light-emitting device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480825A (en) * | 2010-11-30 | 2012-05-30 | 亚德光机股份有限公司 | Light-emitting diode driving method and device |
| CN102781138A (en) * | 2011-05-13 | 2012-11-14 | 陈瑞贞 | Light emitting diode device |
| CN103002629A (en) * | 2011-09-19 | 2013-03-27 | 东莞柏泽光电科技有限公司 | Illuminating apparatus with power detection function and method for illuminating apparatus |
| CN103037563A (en) * | 2011-09-28 | 2013-04-10 | 东莞柏泽光电科技有限公司 | Lighting device and lighting method capable of reducing stroboflash |
| CN113241583A (en) * | 2021-05-06 | 2021-08-10 | Oppo广东移动通信有限公司 | Optical signal emitting device, optical signal sensor and electronic equipment |
-
2009
- 2009-04-22 CN CN200910133990A patent/CN101871582A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480825A (en) * | 2010-11-30 | 2012-05-30 | 亚德光机股份有限公司 | Light-emitting diode driving method and device |
| CN102781138A (en) * | 2011-05-13 | 2012-11-14 | 陈瑞贞 | Light emitting diode device |
| CN103002629A (en) * | 2011-09-19 | 2013-03-27 | 东莞柏泽光电科技有限公司 | Illuminating apparatus with power detection function and method for illuminating apparatus |
| CN103037563A (en) * | 2011-09-28 | 2013-04-10 | 东莞柏泽光电科技有限公司 | Lighting device and lighting method capable of reducing stroboflash |
| CN113241583A (en) * | 2021-05-06 | 2021-08-10 | Oppo广东移动通信有限公司 | Optical signal emitting device, optical signal sensor and electronic equipment |
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Open date: 20101027 |