CN103068117A - Light-emitting diode (LED) driver with lighting brightness adjustable - Google Patents
Light-emitting diode (LED) driver with lighting brightness adjustable Download PDFInfo
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- CN103068117A CN103068117A CN 201210567588 CN201210567588A CN103068117A CN 103068117 A CN103068117 A CN 103068117A CN 201210567588 CN201210567588 CN 201210567588 CN 201210567588 A CN201210567588 A CN 201210567588A CN 103068117 A CN103068117 A CN 103068117A
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Abstract
The invention provides a light-emitting diode (LED) driver with lighting brightness adjustable. According to the LED driver with the lighting brightness adjustable, the problem that a flash lamp is uncontrollable in the lighting brightness is solved. The LED driver with the lighting brightness adjustable comprises an input port, an output port, a voltage changer, an LED strand, a controllable resistor and a photosensitive unit, wherein the input port is used for receiving input voltages, the output port is used for supplying driving voltages, and the voltage changer is connected between the input port and a reference ground in a coupling mode so as to convert the input voltages into the driving voltages, the LED strand and the controllable resistor are connected between the output port and the reference ground in a coupling mode, and according to light intensity of external environment, the photosensitive unit can produce a control signal to control a resistance value of the photosensitive unit. When the light intensity of the external environment is high, the control value of the control signal output by the photosensitive unit on the resistance value of the photosensitive unit is large. When the light intensity of the external environment is small, the control value of the control signal output by the photosensitive unit on the resistance value of the photosensitive unit is small. According to the LED driver with the lighting brightness adjustable, flash brightness of the flash lamp can be automatically adjusted according to change of light of the external environment, and shooting quality is improved.
Description
Technical field
The present invention relates to electronic technology field, particularly the adjustable led driver of a kind of luminosity.
Background technology
Digital camera is because simple, the light advantage such as portable of its simple operation, duplicate photograph has obtained liking of consumers in general.But existing digital camera, its photoflash lamp are when opening, no matter external environment light is strong and weak, it is all identical to dodge the flash luminance of turning off the light, so that captured phase tablet quality is not fully up to expectations in some cases.
Summary of the invention
The present invention proposes the adjustable led driver of a kind of luminosity, has solved because existing flash lamp of digital camera is all identical in the brightness of extraneous ambient light different situations glitter down, causes captured phase tablet quality problem not fully up to expectations.
Technical scheme of the present invention is achieved in that
The adjustable led driver of a kind of luminosity comprises: input port receives input voltage; Output port provides driving voltage; Voltage changer is coupled in input port and with reference between the ground, in order to input voltage is converted into driving voltage; LED string and controllable resistor are coupled in output port and with reference between the ground; Photosensitive unit according to the external environment light intensity, produces control signal with the resistance of control controllable resistor; Wherein when ambient light intensity was higher, the resistance of the control signal control controllable resistor of photosensitive unit output was larger, and when ambient light intensity was weak, the resistance of the control signal control controllable resistor of photosensitive unit output was less.
Alternatively, described voltage changer comprises buck converter.
Alternatively, described photosensitive unit comprises: current mirror, have input terminal and lead-out terminal, and its input terminal is coupled to power supply via the contact resistance device, and its lead-out terminal provides current signal; Light-sensitive element is coupled to the lead-out terminal received current signal of current mirror, and produces described control signal based on current signal; Wherein: described light-sensitive element resistance when ambient light intensity is stronger is less; Resistance is larger when ambient light intensity is weak.
Alternatively, described light-sensitive element comprises photodiode, photo resistance or phototriode.
Alternatively, described current mirror comprises the first triode and the second triode, wherein the base stage of the base stage of the collector electrode of the first triode, the first triode and the second triode all is coupled to power supply via the contact resistance device, the emitter of the first triode and the second triode all connects with reference to ground, and the collector electrode of the second triode is coupled to described light-sensitive element.
The invention has the beneficial effects as follows: the luminosity of photoflash lamp has obtained effectively regulating according to the variation of external environment.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the electrical block diagram of the adjustable led driver 100 of the luminosity of one embodiment of the invention;
Fig. 2 is the electrical block diagram of the adjustable led driver 200 of the luminosity of another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the electrical block diagram of the adjustable led driver 100 of the luminosity of one embodiment of the invention.As shown in Figure 1, the adjustable led driver 100 of described luminosity comprises: input port receives input voltage vin; Output port provides driving voltage Vo; Voltage changer 101 is coupled in input port and with reference between the ground, in order to input voltage vin is converted into driving voltage Vo; LED string 102 and controllable resistor 103 are coupled in output port and with reference between the ground; Photosensitive unit 104 according to the external environment light intensity, produces control signal with the resistance of control controllable resistor 103; Wherein when ambient light intensity was higher, the resistance of the control signal control controllable resistor 103 of photosensitive unit 104 outputs was larger, and when ambient light intensity was weak, the resistance of the control signal control controllable resistor 103 of photosensitive unit 104 outputs was less.
Preferably, voltage changer 101 comprises buck converter.
Fig. 2 is the electrical block diagram of the adjustable led driver 200 of the luminosity of another embodiment of the present invention.The adjustable led driver 200 of luminosity shown in Figure 2 has specifically illustrated the electrical block diagram of photosensitive unit 104.As shown in Figure 2, photosensitive unit 104 comprises: current mirror 41, have input terminal and lead-out terminal, and its input terminal is coupled to power supply Vcc via contact resistance device 42, and its lead-out terminal provides current signal; Light-sensitive element 43 is coupled to the lead-out terminal received current signal of current mirror 41, and produces described control signal based on current signal; Wherein: described light-sensitive element 43 resistance when ambient light intensity is stronger is less; Resistance is larger when ambient light intensity is weak.
Preferably, described light-sensitive element 43 comprises photodiode, photo resistance or phototriode.
Preferably, described current mirror 41 comprises the first triode and the second triode, wherein the base stage of the base stage of the collector electrode of the first triode, the first triode and the second triode all is coupled to power supply Vcc via contact resistance device 42, the emitter of the first triode and the second triode all connects with reference to ground, and the collector electrode of the second triode is coupled to described light-sensitive element 43.
In the running of the adjustable led driver 100/200 of luminosity, when ambient light strengthened, the resistance of light-sensitive element 43 reduced, and control signal reduces thereupon.Correspondingly, the resistance of controllable resistor 103 becomes large.Then the resistance of LED path becomes large, and the electric current of flowing through on it reduces, and therefore dodges the luminosity of turning off the light and weakens.Otherwise when ambient light weakened, the resistance of light-sensitive element 43 increased, and control signal increases thereupon.Correspondingly, the resistance of controllable resistor 103 diminishes.Then the resistance of LED path is little large, and the electric current of flowing through on it increases, and therefore dodges the luminosity of turning off the light and strengthens.
Therefore, the luminosity of photoflash lamp has obtained effectively regulating according to the variation of external environment.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the adjustable led driver of luminosity is characterized in that, comprising:
Input port receives input voltage;
Output port provides driving voltage;
Voltage changer is coupled in input port and with reference between the ground, in order to input voltage is converted into driving voltage;
LED string and controllable resistor are coupled in output port and with reference between the ground;
Photosensitive unit according to the external environment light intensity, produces control signal with the resistance of control controllable resistor; Wherein
When ambient light intensity was higher, the resistance of the control signal control controllable resistor of described photosensitive unit output was larger;
When ambient light intensity was weak, the resistance of the control signal control controllable resistor of described photosensitive unit output was less.
2. the adjustable led driver of luminosity as claimed in claim 1 is characterized in that, described voltage changer comprises buck converter.
3. the adjustable led driver of luminosity as claimed in claim 1 is characterized in that, described photosensitive unit comprises:
Current mirror has input terminal and lead-out terminal, and its input terminal is coupled to power supply via the contact resistance device, and its lead-out terminal provides current signal;
Light-sensitive element is coupled to the lead-out terminal received current signal of current mirror, and produces described control signal based on current signal; Wherein said light-sensitive element
Resistance is less when ambient light intensity is stronger;
Resistance is larger when ambient light intensity is weak.
4. the adjustable led driver of luminosity as claimed in claim 3, it is characterized in that, described current mirror comprises the first triode and the second triode, wherein the base stage of the base stage of the collector electrode of the first triode, the first triode and the second triode all is coupled to power supply via the contact resistance device, the emitter of the first triode and the second triode all connects with reference to ground, and the collector electrode of the second triode is coupled to described light-sensitive element.
5. the adjustable led driver of luminosity as claimed in claim 3 is characterized in that, described light-sensitive element comprises photodiode, photo resistance or phototriode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210567588 CN103068117A (en) | 2012-12-11 | 2012-12-11 | Light-emitting diode (LED) driver with lighting brightness adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210567588 CN103068117A (en) | 2012-12-11 | 2012-12-11 | Light-emitting diode (LED) driver with lighting brightness adjustable |
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| Publication Number | Publication Date |
|---|---|
| CN103068117A true CN103068117A (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210567588 Pending CN103068117A (en) | 2012-12-11 | 2012-12-11 | Light-emitting diode (LED) driver with lighting brightness adjustable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482440A (en) * | 2014-12-17 | 2015-04-01 | 常熟史美特节能照明技术有限公司 | Brightness-adjustable bulb |
| CN104580745A (en) * | 2015-01-29 | 2015-04-29 | 广东欧珀移动通信有限公司 | Shooting light fill-in method and device of mobile terminal |
| CN107094346A (en) * | 2017-07-05 | 2017-08-25 | 深圳传音控股有限公司 | The brightness of flash lamp adjusting method and brightness control system of a kind of intelligent terminal |
| CN108759945A (en) * | 2018-08-07 | 2018-11-06 | 智恒科技股份有限公司 | A kind of light pulse sensor of intellectual water meter |
-
2012
- 2012-12-11 CN CN 201210567588 patent/CN103068117A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482440A (en) * | 2014-12-17 | 2015-04-01 | 常熟史美特节能照明技术有限公司 | Brightness-adjustable bulb |
| CN104580745A (en) * | 2015-01-29 | 2015-04-29 | 广东欧珀移动通信有限公司 | Shooting light fill-in method and device of mobile terminal |
| CN104580745B (en) * | 2015-01-29 | 2017-05-24 | 广东欧珀移动通信有限公司 | Shooting light fill-in method and device of mobile terminal |
| CN107094346A (en) * | 2017-07-05 | 2017-08-25 | 深圳传音控股有限公司 | The brightness of flash lamp adjusting method and brightness control system of a kind of intelligent terminal |
| CN107094346B (en) * | 2017-07-05 | 2020-08-04 | 深圳传音控股股份有限公司 | Flash lamp brightness adjusting method and system of intelligent terminal |
| CN108759945A (en) * | 2018-08-07 | 2018-11-06 | 智恒科技股份有限公司 | A kind of light pulse sensor of intellectual water meter |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Lianmeng Electronic Instrument Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130424 |