CN104540291A - Light emitting device and control method - Google Patents
Light emitting device and control method Download PDFInfo
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- CN104540291A CN104540291A CN201410850520.1A CN201410850520A CN104540291A CN 104540291 A CN104540291 A CN 104540291A CN 201410850520 A CN201410850520 A CN 201410850520A CN 104540291 A CN104540291 A CN 104540291A
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Abstract
The invention relates to a light emitting device and a control method. The light emitting device comprises at least two light emitting units, a constant current driving circuit and a controller. The light emitting units are connected in series and then are electrically connected with the constant current driving circuit. Each light emitting unit comprises a light emitting branch circuit and a bypass branch circuit which are connected in parallel, wherein a light emitter is arranged on the light emitting branch circuit, and a switch is arranged on the bypass branch circuit. Each switch is provided with a signal input end. The controller is provided with a signal output end. The signal input ends are connected with the signal output end in a butting mode. The controller is used for controlling the switches to be turned on and off. A single constant current driving power source is used for supplying power to the multiple light emitters. The light emitting device is simple in structure and convenient to control, and is precisely controlled to emit light of different colors by controlling the light emitters of different colors.
Description
Technical field
The present invention relates to a kind of light-emitting device and control method.
Background technology
Existing LED, be use a string LED lamp bead of driving power, the brightness of all lamp pearls is identical, can not control separately the brightness of single lamp pearl and realize light mixing effect.Reach the effect of mixed light, different photochromic lamp pearl illuminated in combination is made to present different colours, need to use multiple driving power to coordinate multiple lamp pearl, each driving power only drives a lamp pearl, causes equipment redundancy, and multiple power supply caloric value is large, when needing the lamp pearl of light modulation more, caloric value is larger, constrains the development of LED mixed light, and causes energy dissipation.
Summary of the invention
Based on this, the present invention discloses a kind of light-emitting device, uses single constant-current driving power supply to be that multiple photophore is powered, and structure is simple, control is convenient, by controlling different photochromic photophore, precisely controlling light-emitting device and presenting different colors.
Its technical scheme is as follows:
A kind of light-emitting device, comprising: luminescence unit, constant-current drive circuit, controller; Be electrically connected with constant-current drive circuit after at least two luminescence unit series connection, luminescence unit comprises luminous branch road and bypass branch, luminous branch road and bypass branch are connected in parallel, luminous branch road there is photophore, bypass branch has derailing switch, and derailing switch has signal input part, and controller has signal output part, signal input part docks with signal output part, and controller is used for conducting and the cut-off of control switch device.
A kind of light-emitting device control method, controls the time of each luminescence unit luminescence, and different photochromic luminescence unit illuminated in combination presents different colors; For each luminescence unit, when controller sends the first signal to derailing switch, derailing switch ends, and bypass branch disconnects, and the electric current flowing through luminescence unit flows through from luminous branch road, and photophore is luminous; When controller sends secondary signal to derailing switch, derailing switch conducting, bypass branch conducting, the electric current flowing through luminescence unit flows through from bypass branch, and luminous branch road does not have electric current to flow through, and photophore extinguishes.
Wherein in an embodiment, described derailing switch comprises MOSFET pipe and driver module corresponding with it, described MOSFET pipe and the electrical connection of described driver module.
Wherein in an embodiment, described photophore is light-emitting diode.
Wherein in an embodiment, the photochromic difference of each described photophore luminescence.
Wherein in an embodiment, described controller sends pulse width modulating signal, and described pulse width modulating signal comprises described first signal and described secondary signal.
Wherein in an embodiment, it is characterized in that, when arbitrary luminescence unit is luminous, remaining luminescence unit extinguishes.
Below the advantage of preceding solution or principle are described:
1, light-emitting device comprises: luminescence unit, constant-current drive circuit, controller; Be electrically connected with constant-current drive circuit after at least two luminescence unit series connection, luminescence unit comprises luminous branch road and bypass branch, luminous branch road and bypass branch are connected in parallel, the electric current flowing through luminescence unit equals flow through the electric current of luminous branch road and flow through the electric current sum of bypass branch, bypass branch plays the shunting action to luminous branch road, owing to using constant current-supplying, the electric current controlling bypass branch just can control the electric current of luminous branch road;
Luminous branch road has photophore, and when luminous branch road has electric current to flow through, photophore is luminous, and when luminous branch road does not have electric current to flow through, photophore extinguishes;
Bypass branch there is derailing switch, derailing switch is for controlling conducting and the disconnection of bypass branch, derailing switch has signal input part, controller has signal output part, signal input part docks with signal output part, and controller is used for conducting and the cut-off of control switch device, and controller controls the electric current of bypass branch by control switch device, and then control the electric current of luminous branch road, realize the control to photophore luminescence like this;
For whole light-emitting device, control the time of each luminescence unit luminescence, different photochromic luminescence unit illuminated in combination presents different colors;
For each luminescence unit, when controller sends the first signal to derailing switch, derailing switch ends, and bypass branch disconnects, and the electric current flowing through luminescence unit flows through from luminous branch road, and photophore is luminous; When controller sends secondary signal to derailing switch, derailing switch conducting, bypass branch conducting, the electric current flowing through luminescence unit flows through from bypass branch, and luminous branch road does not have electric current to flow through, and photophore extinguishes.
2, described photophore is light-emitting diode; Described derailing switch comprises MOSFET pipe and driver module corresponding with it, described MOSFET pipe and the electrical connection of described driver module; Described controller sends pulse width modulating signal, and described pulse width modulating signal comprises described first signal and described secondary signal;
The brightness of lumination of light emitting diode and the relation of electric current are nonlinear, little current fluctuation will cause light-emitting diode luminance deviation very large, therefore, pulse width modulating signal is adopted to control it, to the time that control light-emitting diode is lighted, when light-emitting diode lights luminescence, its electric current is fixing, so its brightness is fixing, precisely can control photochromic after mixed light with this.
3, the photochromic difference of each described photophore luminescence because adopt pulse width modulating signal to control, so according to the luminescence of setting light-emitting device entirety photochromic and each photophore photochromic, calculate the brightness of this photochromic photophore luminescence; And then, according to the relation of photophore brightness and electric current, calculate fluorescent lifetime and the fall time of photophore, fluorescent lifetime is set to the deadline of derailing switch, fall time is set to the ON time of derailing switch, and photochromic difference, the brightness of each photophore are different, and combination presents abundant color.
4, when arbitrary luminescence unit is luminous, remaining luminescence unit extinguishes; Because the electric current flowing through LED light emitter has impact to the photochromic of LED light emitter, therefore constant-current drive circuit is adopted to power to the luminescence unit of series connection, when arbitrary luminescence unit is luminous, its glow current immobilizes, ensure that its brightness is constant, photochromic constant, when arbitrary luminescence unit is luminous, remaining luminescence unit extinguishes, make the current constant of each luminescence unit, realize the accurate control photochromic to mixed light;
Further, constant-current supply is each only powers to single luminescence unit, and when last luminescence unit extinguishes, can power for next luminescence unit, constant-current drive circuit load is more stable, makes mixed light accurate;
In addition, constant-current drive circuit is powered to single luminescence unit in real time, does not have energy dissipation, improves utilization rate of equipment and installations.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment of the present invention light-emitting device.
Description of reference numerals:
100, light-emitting diode, 210, MOSFET pipe, 220, gate driver circuit.
Embodiment
Below embodiments of the invention are described in detail:
Light-emitting device comprises: luminescence unit, constant-current drive circuit, controller.
Be electrically connected with constant-current drive circuit after three luminescence unit series connection.
Luminescence unit comprises luminous branch road and bypass branch, and luminous branch road and bypass branch are connected in parallel.
Luminous branch road has photophore, and photophore is light-emitting diode 100, the photochromic different difference of each light-emitting diode 100 luminescence.
Bypass branch has derailing switch, and derailing switch comprises MOSFET pipe 210 and gate driver circuit 220, MOSFET pipe 210 corresponding with it and gate driver circuit 220 and is electrically connected, gate driver circuit 220 driven MOS FET pipe 210.
Derailing switch has signal input part, and controller has signal output part, and signal input part docks with signal output part, and controller sends control signal to gate driver circuit 220, the conducting of control MOSFET pipe 210 and cut-off.
When light-emitting device is controlled:
Controller sends pulse width modulating signal, and pulse width modulating signal comprises the first signal and secondary signal, controls the time of each luminescence unit luminescence, and different photochromic luminescence unit illuminated in combination presents different colors;
For each luminescence unit, when controller sends the first signal to derailing switch, derailing switch ends, bypass branch is disconnected, and the electric current flowing through luminescence unit flows through from luminous branch road, and photophore is luminous; When controller sends secondary signal to derailing switch, derailing switch conducting, make bypass branch conducting, the electric current flowing through luminescence unit flows through from bypass branch, and luminous branch road does not have electric current to flow through, and photophore extinguishes;
When arbitrary luminescence unit is luminous, remaining luminescence unit extinguishes.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed the specific embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. a light-emitting device, is characterized in that, comprising: luminescence unit, constant-current drive circuit, controller;
Be electrically connected with constant-current drive circuit after at least two luminescence unit series connection, luminescence unit comprises luminous branch road and bypass branch, luminous branch road and bypass branch are connected in parallel, luminous branch road there is photophore, bypass branch has derailing switch, and derailing switch has signal input part, and controller has signal output part, signal input part docks with signal output part, and controller is used for conducting and the cut-off of control switch device.
2. light-emitting device according to claim 1, is characterized in that, described derailing switch comprises MOSFET pipe and driver module corresponding with it, described MOSFET pipe and the electrical connection of described driver module.
3. light-emitting device according to claim 1, is characterized in that, described photophore is light-emitting diode.
4. the arbitrary light-emitting device according to claims 1 to 3, is characterized in that, the photochromic difference of each described photophore luminescence.
5. a light-emitting device control method, is characterized in that:
Control the time of each luminescence unit luminescence, different photochromic luminescence unit illuminated in combination presents different colors;
For each luminescence unit, when controller sends the first signal to derailing switch, derailing switch ends, and bypass branch disconnects, and the electric current flowing through luminescence unit flows through from luminous branch road, and photophore is luminous; When controller sends secondary signal to derailing switch, derailing switch conducting, bypass branch conducting, the electric current flowing through luminescence unit flows through from bypass branch, and luminous branch road does not have electric current to flow through, and photophore extinguishes.
6. light-emitting device control method according to claim 5, is characterized in that, described controller sends pulse width modulating signal, and described pulse width modulating signal comprises described first signal and described secondary signal.
7. the arbitrary light-emitting device control method according to claim 5 or 6, is characterized in that, when arbitrary luminescence unit is luminous, remaining luminescence unit extinguishes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410850520.1A CN104540291B (en) | 2014-12-30 | 2014-12-30 | Light-emitting device and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410850520.1A CN104540291B (en) | 2014-12-30 | 2014-12-30 | Light-emitting device and control method |
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| CN104540291A true CN104540291A (en) | 2015-04-22 |
| CN104540291B CN104540291B (en) | 2017-12-29 |
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| CN1691126A (en) * | 2004-04-20 | 2005-11-02 | 索尼株式会社 | Constant current driving device, backlight light source device, and color liquid crystal display device |
| CN101331796A (en) * | 2005-12-13 | 2008-12-24 | 皇家飞利浦电子股份有限公司 | Led lighting device |
| CN102077373A (en) * | 2008-07-15 | 2011-05-25 | 夏普株式会社 | Light emitting element driving circuit |
| JP2011249377A (en) * | 2010-05-24 | 2011-12-08 | Panasonic Corp | Light source driving device, backlight device, and liquid crystal display device |
| CN202759632U (en) * | 2012-06-20 | 2013-02-27 | 伟思科技控股有限公司 | Drive circuit and lighting device of light emitting diode |
| CN204425710U (en) * | 2014-12-30 | 2015-06-24 | 广州市珠江灯光科技有限公司 | Light-emitting device |
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2014
- 2014-12-30 CN CN201410850520.1A patent/CN104540291B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691126A (en) * | 2004-04-20 | 2005-11-02 | 索尼株式会社 | Constant current driving device, backlight light source device, and color liquid crystal display device |
| CN101331796A (en) * | 2005-12-13 | 2008-12-24 | 皇家飞利浦电子股份有限公司 | Led lighting device |
| CN102077373A (en) * | 2008-07-15 | 2011-05-25 | 夏普株式会社 | Light emitting element driving circuit |
| JP2011249377A (en) * | 2010-05-24 | 2011-12-08 | Panasonic Corp | Light source driving device, backlight device, and liquid crystal display device |
| CN202759632U (en) * | 2012-06-20 | 2013-02-27 | 伟思科技控股有限公司 | Drive circuit and lighting device of light emitting diode |
| CN204425710U (en) * | 2014-12-30 | 2015-06-24 | 广州市珠江灯光科技有限公司 | Light-emitting device |
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| CN104540291B (en) | 2017-12-29 |
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