CN102458007A - Light source brightness adjusting circuit - Google Patents
Light source brightness adjusting circuit Download PDFInfo
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- CN102458007A CN102458007A CN2010105163401A CN201010516340A CN102458007A CN 102458007 A CN102458007 A CN 102458007A CN 2010105163401 A CN2010105163401 A CN 2010105163401A CN 201010516340 A CN201010516340 A CN 201010516340A CN 102458007 A CN102458007 A CN 102458007A
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Abstract
A light source brightness adjusting circuit comprises a light-sensitive unit, an amplification unit, a switch unit and a luminous unit. The switch unit comprises several electronic switches with successively rising turn-on voltages. The luminous unit comprises several groups of light-emitting diodes (LEDs) corresponding to the several electronic switches. The each group of the LEDs are connected with the amplification unit through the corresponding electronic switch. The light-sensitive unit is used to sense a brightness of an ambient light source and output a first voltage to the amplification unit according to a sensing result. The amplification unit amplifies the first voltage into a second voltage and outputs the second voltage to the switch unit. In the switch unit, the electronic switch, whose turn-on voltage is less than the second voltage, is turned on. In the luminous unit, the group of the LEDs, which are connected with the turn-on electronic switch, are luminous. The light source brightness adjusting circuit can accurately adjust the brightness of the light source.
Description
Technical field
The present invention relates to a kind of light-source brightness adjustment circuit.
Background technology
In order to make the clear photography in night or darker environment of photography function, increasing video camera has all added the design of infrared LEDs (light-emitting diode, light-emitting diode).But in present design, it is exactly by Close All that infrared LEDs is not all opened.When environment light source is not too dark and when infrared LEDs all opened, can cause the picture of photography bright excessively; And when environment light source be not very bright and during with the infrared LEDs Close All, then can cause the picture of photography dark partially.This shows that the infrared LEDs in the design can not come to adjust exactly brightness according to the actual requirements at present, thereby causes photographic effects not good.
Summary of the invention
In view of above content, be necessary to provide a kind of light-source brightness adjustment circuit that can adjust light-source brightness exactly.
A kind of light-source brightness adjustment circuit; Comprise a photosensitive unit, an amplifying unit, a switch element and a luminescence unit; Said switch element comprises the electronic switch that some cut-in voltages raise successively, and said luminescence unit comprises and the corresponding some groups of light-emitting diodes of said some electronic switches, and every group of light-emitting diode links to each other with said amplifying unit through a corresponding electronic switch; Said photosensitive unit is used for the brightness of sensitive context light source; And export one first voltage according to sensing result and give said amplifying unit, said amplifying unit becomes one second voltage with said first voltage amplification, and said second voltage is exported to said switch element; Cut-in voltage is unlocked less than the electronic switch of said second voltage in the said switch element, and the light-emitting diode group that links to each other with the electronic switch that is unlocked in the said luminescence unit is luminous.
A kind of light-source brightness adjustment circuit; Comprise a photosensitive unit, an amplifying unit, a switch element, a luminescence unit and a processing unit; Said switch element comprises the switch element that some cut-in voltages raise successively, and said luminescence unit comprises and the corresponding some groups of light-emitting diodes of said some switch elements that the input of each switch element links to each other with said amplifying unit; First output of each switch element links to each other with said processing unit; The corresponding light-emitting diode group with one of second output of each switch element links to each other, and said photosensitive unit is used for the brightness of sensitive context light source, and exports one first voltage according to sensing result and give said amplifying unit; Said amplifying unit becomes one second voltage with said first voltage amplification; And said second voltage exported to said switch element, and cut-in voltage is unlocked less than the switch element of said second voltage in the said switch element, and the light-emitting diode group that links to each other with the switch element that is unlocked in the said luminescence unit is luminous; Said processing unit is detected the unlatching and the closed condition of said some switch elements, and judges the luminous situation of said some light-emitting diode group according to the status signal that detects.
Light-source brightness adjustment circuit of the present invention utilizes said photosensitive unit to come the brightness of sensitive context light source; And utilize said switch element to control the luminous intensity of said luminescence unit according to sensed result; Brightness with to light source is adjusted exactly, thereby reaches photographic effects preferably.
Description of drawings
Below in conjunction with accompanying drawing and preferred embodiments the present invention is described in further detail.
Fig. 1 is the theory diagram of light-source brightness adjustment circuit preferred embodiments of the present invention.
Fig. 2 is the circuit diagram of light-source brightness adjustment circuit preferred embodiments of the present invention.
The main element symbol description
Amplifying unit 20
Switch element 30
Light-source brightness adjustment circuit 100
Photo resistance R1
Resistance R 2-R20
Power supply VCC
Amplifier U
Electronic switch Q1-Q8
LED 1-LED12
Embodiment
Please refer to Fig. 1, the preferred embodiments of light-source brightness of the present invention adjustment circuit 100 comprises a photosensitive unit 10, an amplifying unit 20, a switch element 30, a luminescence unit 40 and a processing unit 50.Said amplifying unit 20 links to each other with said photosensitive unit 10, and links to each other with said luminescence unit 40 through said switch element 30, and said switch element 30 also links to each other with said processing unit 50.Said photosensitive unit 10 is used for the brightness of sensitive context light source, and exports one first voltage V1 according to the result who senses and give said amplifying unit 20.Said amplifying unit 20 zooms into one second voltage V2 with the said first voltage V1, and the said second voltage V2 is exported to said switch element 30, with the unlatching of controlling said switch element 30 and close, and then controls the luminous intensity of said luminescence unit 40.Said processing unit 50 is detected the unlatching and the closed condition of said switch element 30, and judges the luminous situation of said luminescence unit 40 according to the status signal that detects.In this execution mode, said light-source brightness adjustment circuit 100 is located in the video camera (figure does not show), and for said video camera suitable light-source brightness is provided; Said processing unit 50 is the inner processing unit of said video camera, and like microprocessor etc., said processing unit 50 comes the inner relevant parameter of said video camera is adjusted accordingly according to the luminous situation of said luminescence unit 40, to reach better photographic effects.
Please continue with reference to figure 2, said photosensitive unit 10 comprises a photo resistance R1.The end of said photo resistance R1 links to each other the other end ground connection of said photo resistance R1 through a resistance R 2 with a power supply VCC.Be provided with a node A between said photo resistance R1 and the said resistance R 2, said node A exports the said first voltage V1 as the output of said photosensitive unit 10.In this execution mode; Said first voltage
wherein, VCC is the voltage of said power supply VCC.
Said amplifying unit 20 comprises an amplifier U.Said amplifier U comprises a homophase input, an inverting input and an output OUT.Said in-phase input end links to each other with said node A, to receive the said first voltage V1.Said inverting input passes through a resistance R 3 ground connection, and links to each other with said output OUT through a resistance R 4.Said output OUT exports the said second voltage V2.In this execution mode; In other embodiments, the multiplication factor of said amplifier U can adjust accordingly according to actual conditions said second voltage of the multiplication factor of said amplifier U
.
Said switch element 30 comprises four switch elements; First switch element comprises two electronic switch Q1, Q2; The second switch element comprises two electronic switch Q3, Q4, and the 3rd switch element comprises two electronic switch Q5, Q6, and the 4th switch element comprises two electronic switch Q7, Q8.First end of said electronic switch Q1 links to each other with the output OUT of said amplifier U through a resistance R 5 as the input of said first switch element, and through a resistance R 6 ground connection.Second end of said electronic switch Q1 links to each other with said processing unit 5Q as first output of said first switch element, and links to each other with said power supply VCC through a resistance R 7.First end of said electronic switch Q2 links to each other with first end of said electronic switch Q1.Second end of said electronic switch Q2 links to each other with said luminescence unit 4Q as second output of said first switch element.First end of said electronic switch Q3 links to each other with the output OUT of said amplifier U through a resistance R 8 as the input of said second switch element, and through a resistance R 9 ground connection.Second end of said electronic switch Q3 links to each other with said processing unit 50 as first output of said second switch element, and links to each other with said power supply VCC through a resistance R 10.First end of said electronic switch Q4 links to each other with first end of said electronic switch Q3.Second end of said electronic switch Q4 links to each other with said luminescence unit 40 as second output of said second switch element.First end of said electronic switch Q5 links to each other with the output OUT of said amplifier U through a resistance R 11 as the input of said the 3rd switch element, and through a resistance R 12 ground connection.Second end of said electronic switch Q5 links to each other with said processing unit 50 as first output of said the 3rd switch element, and links to each other with said power supply VCC through a resistance R 13.First end of said electronic switch Q6 links to each other with first end of said electronic switch Q5.Second end of said electronic switch Q6 links to each other with said luminescence unit 40 as second output of said the 3rd switch element.First end of said electronic switch Q7 links to each other with the output OUT of said amplifier U through a resistance R 14 as the input of said the 4th switch element, and through a resistance R 15 ground connection.Second end of said electronic switch Q7 links to each other with said processing unit 50 as first output of said the 4th switch element, and links to each other with said power supply VCC through a resistance R 16.First end of said electronic switch Q8 links to each other with first end of said electronic switch Q7.Second end of said electronic switch Q8 links to each other with said luminescence unit 40 as second output of said the 4th switch element.The equal ground connection of the 3rd end of said electronic switch Q1-Q8.
In this execution mode, said electronic switch Q1-Q8 is NPN type triode, and first end of each electronic switch, second end and the 3rd end be base stage, collector electrode and the emitter of corresponding NPN type triode respectively; And the cut-in voltage of said electronic switch Q1, Q2 is identical; The cut-in voltage of said electronic switch Q3, Q4 is identical and be higher than the cut-in voltage of said electronic switch Q1, Q2; The cut-in voltage of said electronic switch Q5, Q6 is identical and be higher than the cut-in voltage of said electronic switch Q3, Q4, and the cut-in voltage of said electronic switch Q7, Q8 is identical and be higher than the cut-in voltage of said electronic switch Q5, Q6.That is, the cut-in voltage of four switch elements raises successively.In other embodiments, said resistance R 5, R6, R8, R9, R11, R12, R14 and R15 all can omit, and at this moment, first end of said electronic switch Q1-Q8 all directly links to each other with the output OUT of said amplifier U; Said electronic switch Q1-Q8 also can be other electronic switches such as NMOS FET.
Said luminescence unit 40 comprises four groups of light-emitting diodes; First group of light-emitting diode comprises three LED 1-LED3 of series connection successively; Second group of light-emitting diode comprises three LED 4-LED6 of series connection successively; The 3rd group of light-emitting diode comprises three LED 7-LED9 of series connection successively, and the 4th group of light-emitting diode comprises three LED 10-LED12 of series connection successively.The negative electrode of said LED 1 links to each other with second end of said electronic switch Q2; The anode of said LED 1 links to each other with the negative electrode of said LED 2; The anode of said LED 2 links to each other with the negative electrode of said LED 3, and the anode of said LED 3 links to each other with said power supply VCC through a resistance R 17.The negative electrode of said LED 4 links to each other with second end of said electronic switch Q4; The anode of said LED 4 links to each other with the negative electrode of said LED 5; The anode of said LED 5 links to each other with the negative electrode of said LED 6, and the anode of said LED 6 links to each other with said power supply VCC through a resistance R 18.The negative electrode of said LED 7 links to each other with second end of said electronic switch Q6; The anode of said LED 7 links to each other with the negative electrode of said LED 8; The anode of said LED 8 links to each other with the negative electrode of said LED 9, and the anode of said LED 9 links to each other with said power supply VCC through a resistance R 19.The negative electrode of said LED 10 links to each other with second end of said electronic switch Q8; The anode of said LED 10 links to each other with the negative electrode of said LED 11; The anode of said LED 11 links to each other with the negative electrode of said LED 12, and the anode of said LED 12 links to each other with said power supply VCC through a resistance R 20.In this execution mode, said LED 1-LED12 is infrared light-emitting diode.In other embodiments; Number, said luminescence unit 40 included light-emitting diode group number and every group of included light-emitting diode numbers of light-emitting diode of the switch element that said switch element 30 is included all can adjust accordingly according to actual conditions, and the number of the included switch element of said switch element 30 equates with said luminescence unit 40 included light-emitting diode group numbers.
During work, the brightness that the characteristic that the resistance that said photosensitive unit 10 utilizes said photo resistance R1 increases with the reduction of environment light source brightness is come the sensitive context light source.
When the brightness of environment light source was sufficient, the resistance of said photo resistance R1 was very little, and the said first voltage V1 is very little, and said amplifier U is also very little with the second voltage V2 that the said first voltage V1 amplifies back output.At this moment; The said second voltage V2 is less than the cut-in voltage of said electronic switch Q1, Q2; Said electronic switch Q1-Q8 all ends; Said LED 1-LED12 is all not luminous, and said processing unit 50 is high level according to the status signal S1-S4 that detects and judges that said LED 1-LED12 is all not luminous.
When environment light source gradually during deepening, the resistance of said photo resistance R1 increases gradually, and the said first voltage V1 increases thereupon, and said amplifier U also increases by the second voltage V2 that the said first voltage V1 amplifies back output thereupon.As the said second voltage V2 during greater than the cut-in voltage of said electronic switch Q1, Q2; Said electronic switch Q1, Q2 conducting; Said first group of LED 1-LED3 is luminous; With the brightness of supplement ambient light source, said processing unit 50 is that low level judges that said first group of LED 1-LED3 is luminous according to the status signal S1 that detects.
When environment light source continued deepening, the resistance of said photo resistance R1 continued to increase, and the said first voltage V1 increases thereupon, and said amplifier U also increases by the second voltage V2 that the said first voltage V1 amplifies back output thereupon.As the said second voltage V2 during greater than the cut-in voltage of said electronic switch Q3, Q4; Said electronic switch Q1-Q4 conducting; Said LED 1-LED6 is luminous; With the brightness of further supplement ambient light source, said processing unit 50 is that low level judges that said LED 1-LED6 is luminous according to the status signal S1, the S2 that detect.
When environment light source still continued deepening, the resistance of said photo resistance R1 still continued to increase, and the said first voltage V1 increases thereupon, and said amplifier U also increases by the second voltage V2 that the said first voltage V1 amplifies back output thereupon.As the said second voltage V2 during greater than the cut-in voltage of said electronic switch Q5, Q6; Said electronic switch Q1-Q6 conducting; Said LED 1-LED9 is luminous; With the further brightness of supplement ambient light source, said processing unit 50 is low level according to the status signal S1-S3 that detects and judges that said LED 1-LED9 is luminous.
When the complete deepening of environment light source, the resistance of said photo resistance R1 increases once more, and the said first voltage V1 increases thereupon, and said amplifier U also increases by the second voltage V2 that the said first voltage V1 amplifies back output thereupon.As the said second voltage V2 during greater than the cut-in voltage of said electronic switch Q7, Q8; Said electronic switch Q1-Q8 conducting; Said LED 1-LED12 is luminous; So that the brightness of suitable light source to be provided, said processing unit 50 is low level according to the status signal S1-S4 that detects and judges that said LED 1-LED12 is all luminous.
In other embodiments; Said light-source brightness adjustment circuit 100 can be located in other electronic equipment; And when said electronic equipment did not need according to the luminous situation of said luminescence unit 40 and the relevant parameter of said electronic equipment internal adjusted accordingly, said processing unit 50 can omit.At this moment, said electronic switch Q1, Q3, Q5, Q7 and said resistance R 7, R10, R13, R16 all can correspondingly omit.
Light-source brightness adjustment circuit 100 of the present invention utilizes said photosensitive unit 10 to come the brightness of sensitive context light source; And utilize said switch element 30 to control the luminous intensity of said luminescence unit 40 according to sensed result; Brightness with to light source is adjusted exactly, thereby reaches photographic effects preferably.
Claims (14)
1. a light-source brightness is adjusted circuit; Comprise a photosensitive unit, an amplifying unit, a switch element and a luminescence unit; Said switch element comprises the electronic switch that some cut-in voltages raise successively; Said luminescence unit comprises and the corresponding some groups of light-emitting diodes of said some electronic switches; And every group of light-emitting diode links to each other with said amplifying unit through a corresponding electronic switch, and said photosensitive unit is used for the brightness of sensitive context light source, and exports one first voltage according to sensing result and give said amplifying unit; Said amplifying unit becomes one second voltage with said first voltage amplification; And said second voltage exported to said switch element, and cut-in voltage is unlocked less than the electronic switch of said second voltage in the said switch element, and the light-emitting diode group that links to each other with the electronic switch that is unlocked in the said luminescence unit is luminous.
2. light-source brightness adjustment circuit as claimed in claim 1; It is characterized in that: said photosensitive unit comprises a photo resistance; One end of said photo resistance links to each other with a power supply through one first resistance; The other end ground connection of said photo resistance is provided with a node between said photo resistance and said first resistance, and said node is exported said first voltage as the output of said photosensitive unit.
3. light-source brightness adjustment circuit as claimed in claim 2; It is characterized in that: said amplifying unit comprises an amplifier; Said amplifier comprises a homophase input, an inverting input and an output, and said in-phase input end links to each other with said node to receive said first voltage, and said inverting input is through one second grounding through resistance; And link to each other with said output through one the 3rd resistance, said output is exported said second voltage.
4. light-source brightness adjustment circuit as claimed in claim 3; It is characterized in that: each electronic switch comprises one first end, one second end and one the 3rd end; First end of each electronic switch all links to each other with the output of said amplifier; The corresponding light-emitting diode group with one of second end of each electronic switch links to each other, the equal ground connection of the 3rd end of each electronic switch.
5. light-source brightness adjustment circuit as claimed in claim 4; It is characterized in that: said some electronic switches are NPN type triode, and base stage, collector electrode and the emitter of first end of each electronic switch, second end and the corresponding NPN type triode of the 3rd end difference.
6. light-source brightness adjustment circuit as claimed in claim 4; It is characterized in that: every group of light-emitting diode comprises at least one light-emitting diode; Second end of the electronic switch that one end of said at least one light-emitting diode is corresponding with links to each other; The other end of said at least one light-emitting diode links to each other with said power supply, when the electronic switch of correspondence is unlocked, and said at least one lumination of light emitting diode.
7. light-source brightness adjustment circuit as claimed in claim 6, it is characterized in that: said some light-emitting diodes are infrared light-emitting diode, and an end of each light-emitting diode and the other end be the negative electrode and the anode of corresponding infrared light-emitting diode respectively.
8. a light-source brightness is adjusted circuit; Comprise a photosensitive unit, an amplifying unit, a switch element, a luminescence unit and a processing unit; Said switch element comprises the switch element that some cut-in voltages raise successively, and said luminescence unit comprises and the corresponding some groups of light-emitting diodes of said some switch elements that the input of each switch element links to each other with said amplifying unit; First output of each switch element links to each other with said processing unit; The corresponding light-emitting diode group with one of second output of each switch element links to each other, and said photosensitive unit is used for the brightness of sensitive context light source, and exports one first voltage according to sensing result and give said amplifying unit; Said amplifying unit becomes one second voltage with said first voltage amplification; And said second voltage exported to said switch element, and cut-in voltage is unlocked less than the switch element of said second voltage in the said switch element, and the light-emitting diode group that links to each other with the switch element that is unlocked in the said luminescence unit is luminous; Said processing unit is detected the unlatching and the closed condition of said some switch elements, and judges the luminous situation of said some light-emitting diode group according to the status signal that detects.
9. light-source brightness adjustment circuit as claimed in claim 8; It is characterized in that: said photosensitive unit comprises a photo resistance; One end of said photo resistance links to each other with a power supply through one first resistance; The other end ground connection of said photo resistance is provided with a node between said photo resistance and said first resistance, and said node is exported said first voltage as the output of said photosensitive unit.
10. light-source brightness adjustment circuit as claimed in claim 9; It is characterized in that: said amplifying unit comprises an amplifier; Said amplifier comprises a homophase input, an inverting input and an output, and said in-phase input end links to each other with said node to receive said first voltage, and said inverting input is through one second grounding through resistance; And link to each other with said output through one the 3rd resistance, said output is exported said second voltage.
11. light-source brightness adjustment circuit as claimed in claim 10; It is characterized in that: each switch element comprises one first electronic switch and one second electronic switch; First end of said first electronic switch links to each other with the output of said amplifying unit as the input of corresponding switch element; Second end of said first electronic switch links to each other with said processing unit as first output of corresponding switch element; First end of said second electronic switch links to each other with first end of said first electronic switch; Second end of said second electronic switch links to each other the equal ground connection of the 3rd end of said first and second switch element as the corresponding light-emitting diode group with of second output of corresponding switch element.
12. light-source brightness adjustment circuit as claimed in claim 11; It is characterized in that: said first and second electronic switch is NPN type triode, and base stage, collector electrode and the emitter of first end of each electronic switch, second end and the corresponding NPN type triode of the 3rd end difference.
13. light-source brightness adjustment circuit as claimed in claim 11; It is characterized in that: every group of light-emitting diode comprises at least one light-emitting diode; Second end of corresponding second electronic switch with of one end of said at least one light-emitting diode links to each other; The other end of said at least one light-emitting diode links to each other with said power supply, when second electronic switch of correspondence is unlocked, and said at least one lumination of light emitting diode.
14. light-source brightness adjustment circuit as claimed in claim 13, it is characterized in that: said light-emitting diode is infrared light-emitting diode, and an end of said light-emitting diode and the other end be the negative electrode and the anode of corresponding infrared light-emitting diode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105163401A CN102458007A (en) | 2010-10-22 | 2010-10-22 | Light source brightness adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105163401A CN102458007A (en) | 2010-10-22 | 2010-10-22 | Light source brightness adjusting circuit |
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| CN102458007A true CN102458007A (en) | 2012-05-16 |
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| CN2010105163401A Pending CN102458007A (en) | 2010-10-22 | 2010-10-22 | Light source brightness adjusting circuit |
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| CN104411039A (en) * | 2014-10-31 | 2015-03-11 | 无锡鸿声铝业有限公司 | Illuminating lamp with amplifying circuit |
| CN104482458A (en) * | 2014-10-31 | 2015-04-01 | 无锡鸿声铝业有限公司 | Lighting device having amplifying circuit for background wall |
| CN105120554A (en) * | 2015-08-07 | 2015-12-02 | 苏州晶雷光电照明科技有限公司 | Intelligent illumination system based on light-operated sensor |
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| CN105120554A (en) * | 2015-08-07 | 2015-12-02 | 苏州晶雷光电照明科技有限公司 | Intelligent illumination system based on light-operated sensor |
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Application publication date: 20120516 |