CN207266344U - LED light control circuit and high definition camera - Google Patents
LED light control circuit and high definition camera Download PDFInfo
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- CN207266344U CN207266344U CN201721256838.2U CN201721256838U CN207266344U CN 207266344 U CN207266344 U CN 207266344U CN 201721256838 U CN201721256838 U CN 201721256838U CN 207266344 U CN207266344 U CN 207266344U
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- led light
- control circuit
- light source
- resistance
- driving chip
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model provides a kind of LED light control circuit and high definition camera, belongs to LED control technology fields.The LED light control circuit that the utility model embodiment provides includes potential control circuit and driving chip.Potential control circuit is used to, by the magnitude of voltage between power supply and LED light source, feed back to driving chip；And the effective resistance value returned according to driving chip, the internal resistance of linear regulation potential control circuit, to control the electric current for flowing through LED light source.Compared with the control of traditional metal-oxide-semiconductor driving LED light source, which uses current value of the potential control circuit in real-time voltage feedback control circuit, avoids burning out LED light because the current value in circuit is excessive.Meanwhile the control circuit component is less, simple in structure, cost is low, and the electromagnetic interference caused by other electronic products on periphery is smaller.Using the high definition camera of the LED light control circuit, against the interference of LED light stroboscopic the image of shooting can be made apparent.
Description
Technical field
LED control technology fields are the utility model is related to, in particular to a kind of LED light control circuit and high definition phase
Machine.
Background technology
LED illumination is as a kind of new industry technology, constantly developing widely application.How to drive and control
LED light source is a key link in LED technology, at present usually using metal-oxide-semiconductor or triode control LED light source work.
Fig. 1 is a kind of LED control circuit of the prior art, as shown in Figure 1, LED light source interface J1 in the control circuit
One pin connects power supply VDD by resistance, another pin is connected with the drain electrode of metal-oxide-semiconductor unit U1, metal-oxide-semiconductor unit U1
Source electrode ground connection, and be connected by resistance R3 with the grid of metal-oxide-semiconductor unit U1.The grid of metal-oxide-semiconductor unit U1 is connected by resistance R2
It is connected on the PWM output terminals of control chip.Metal-oxide-semiconductor unit controls LED light source according only to the pwm signal that control chip is sent, from
Bad adaptability, LED light it is luminous unstable.When the duty of pwm signal is bigger, the power of LED light is larger, easily by LED
Lamp is burnt out.
Utility model content
For above-mentioned problems of the prior art, the utility model provides a kind of LED light control circuit and high definition
Camera, the control circuit use current value of the digital regulation resistance in real-time voltage feedback control circuit, reduce LED light and are burnt
Bad probability.
In a first aspect, the utility model embodiment provides a kind of LED light control circuit, including potential control circuit and drive
Dynamic chip；The potential control circuit is used to be connected between power supply and LED light source, the driving chip and the current potential
Control circuit connects；
The potential control circuit detects the magnitude of voltage between the power supply and the LED light source, by the magnitude of voltage
Export to the driving chip；
After the driving chip receives the magnitude of voltage, effective resistance value is sent to the potential control circuit；
After the potential control circuit receives the effectively resistance value, the internal resistance of the potential control circuit is adjusted, with control
System flows through the electric current of LED light source.
With reference to first aspect, the utility model embodiment provides the first possible embodiment of first aspect, its
In, the potential control circuit includes digital regulation resistance, and the high-end of the digital regulation resistance is connected with power supply, the numeral
The low side of potentiometer is directly connected to LED light source or connects LED light source by LED light source interface；The slip of the digital regulation resistance
End is connected with the input and output pin of driving chip.
The possible embodiment of with reference to first aspect the first, the utility model embodiment provide the of first aspect
Two kinds of possible embodiments, wherein, the high-end of the digital regulation resistance is connected by resistance with power supply.
With reference to first aspect, the utility model embodiment provides the third possible embodiment of first aspect, its
In, the potential control circuit includes voltage feedback circuit and potentiometer；
Two input terminals of the voltage feedback circuit are connected to the high-end and low side of the potentiometer, the voltage
The output terminal of feedback circuit is connected with the first input and output pin of the driving chip；
The high-end of the potentiometer is connected with power supply；The low side of the potentiometer is directly connected to LED light source or passes through
LED light source interface connects LED light source；The sliding end of the potentiometer and the second input and output pin of the driving chip connect
Connect.
The third possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Four kinds of possible embodiments, wherein, the high-end of the potentiometer is connected by resistance with power supply.
The 4th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Five kinds of possible embodiments, wherein, the voltage feedback circuit includes the first divider resistance and the second divider resistance of series connection；
The public connecting end of first divider resistance and the second divider resistance is connected with the first input and output pin of the driving chip, the
The other end of one divider resistance is connected with power supply, and the other end and the LED light source or LED light source interface of the second divider resistance connect
Connect.
The 4th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Six kinds of possible embodiments, wherein, the voltage feedback circuit includes the first divider resistance and the second divider resistance of series connection；
The public connecting end of first divider resistance and the second divider resistance is connected with the first input and output pin of the driving chip, the
The high-end connection of the other end of one divider resistance and the potentiometer, the other end and LED light source or the LED light of the second divider resistance
Source interface connects.
The third possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Seven kinds of possible embodiments, wherein, the potentiometer is digital regulation resistance.
With reference to first aspect, the utility model embodiment provides the 8th kind of possible embodiment of first aspect, its
In, the potential control circuit includes integrated digital regulation resistance chip；The power pins of the digital regulation resistance chip connect
Power supply, control output pin connection LED light source or LED light source interface are connect, feedback output pin connects the driving chip
The first input and output pin, data-out pin connects the second input and output pin of the driving chip.
Second aspect, the utility model embodiment additionally provide a kind of high definition camera, including LED light source and above-mentioned LED
Lamp control circuit.
The utility model embodiment brings following beneficial effect：
The LED light control circuit and the high definition camera using the LED light control circuit that the utility model embodiment provides,
LED light control circuit includes potential control circuit and driving chip.Potential control circuit is used to be connected to power supply and LED light
Between source, by the magnitude of voltage between power supply and the LED light source, driving chip is fed back to；And returned according to driving chip
Effective resistance value, the internal resistance of linear regulation potential control circuit flows through the current value of LED light source with control, and then controls LED light source
Brightness.Compared with the control of traditional metal-oxide-semiconductor driving LED light source, the LED light control circuit using potential control circuit according to
Current value in real-time voltage feedback control circuit, avoids burning out LED light because the current value in circuit is excessive, reduces LED
The probability that lamp is burned.Meanwhile the control circuit component is less, simple in structure, cost is low, and other electronics on periphery are produced
Electromagnetic interference is smaller caused by product.
Since the LED light control circuit does not use PWM waveform to control LED light source, thus, there is no the frequency of LED light
Sudden strain of a muscle problem, using the high definition camera of the LED light control circuit, can make the image of shooting more clear against the interference of LED light stroboscopic
It is clear.
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is realized and obtained in book, claims and attached drawing.
To enable the above-mentioned purpose of the utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and
Attached drawing appended by cooperation, is described in detail below.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, describe below
In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is a kind of circuit diagram of LED light control circuit of the prior art；
The circuit structure block diagram for the LED light control circuit that Fig. 2 is provided by one embodiment of the utility model；
The circuit diagram for the LED light control circuit that Fig. 3 is provided by the utility model first embodiment；
The circuit diagram for the LED light control circuit that Fig. 4 is provided by the utility model first embodiment；
The circuit diagram for the LED light control circuit that Fig. 5 is provided by the utility model second embodiment；
The circuit diagram for the LED light control circuit that Fig. 6 is provided by the utility model 3rd embodiment；
The circuit diagram for the LED light control circuit that Fig. 7 is provided by the utility model fourth embodiment.
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model part is real
Example is applied, instead of all the embodiments.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can
To arrange and design with a variety of configurations.Therefore, below to the embodiment of the utility model that provides in the accompanying drawings
Detailed description is not intended to limit claimed the scope of the utility model, but is merely representative of the selected reality of the utility model
Apply example.Based on the embodiment in the utility model, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The problem of easily burning out LED light for existing metal-oxide-semiconductor driving LED light source, the utility model embodiment provides
The high definition camera of a kind of LED light control circuit and application the LED light control circuit, the carry out first to the utility model is detailed below
It is thin to introduce.
Embodiment one
This embodiment offers a kind of LED light control circuit.Fig. 2 shows the LED light control circuit that the embodiment provides
Circuit structure block diagram, as shown in Fig. 2, the LED light control circuit, including potential control circuit RA and driving chip U3.Current potential
Control circuit RA is connected between power supply VDD and LED light source interface J1.
In view of water-bed detector, seek on the underwater product such as fish device and can also be illuminated using LED light, in order to make the LED light control
Circuit processed is adapted to underwater environment, and dedicated LED light source interface is provided between potential control circuit RA and LED light source
J1.It is appreciated that in general embodiment, can not also set LED light source interface J1, potential control circuit RA directly with
LED light source connects.
Driving chip U3 is connected with potential control circuit RA.Potential control circuit RA is used to detect power supply VDD and LED
Magnitude of voltage between light source interface J1, the magnitude of voltage of detection is exported to driving chip U3.Driving chip U3 receives control of Electric potentials
After the magnitude of voltage of circuit RA feedbacks, the effective resistance value for determining or adjusting according to above-mentioned magnitude of voltage is sent to potential control circuit RA；
After potential control circuit RA receives effective resistance value, the internal resistance of adjustment potential control circuit RA, with the electric current in limiting circuit,
I.e. control flows through the electric current of LED light source, and then controls the brightness of LED light.
In the specific embodiment shown in Fig. 3 to Fig. 5, potential control circuit is digital regulation resistance RA1.Such as Fig. 3 and Fig. 4 institutes
Show, the high-end of digital regulation resistance RA1 is connected with power supply VDD, and low side and the LED light source interface J1 of digital regulation resistance RA1 connect
Connect, the sliding end of digital regulation resistance RA1 is connected with the input and output pin (IO1, IO2) of driving chip U3.As shown in figure 5, number
The high-end of word potentiometer RA1 is connected with power supply VDD, and the low side of digital regulation resistance RA1 is directly connected to LED light source, numeral electricity
The sliding end of position device RA1 is connected with the input and output pin (IO1, IO2) of driving chip U3.
Further say, driving chip U3 can be microcontroller.For possessing the microcontroller of analog-digital conversion function, numeral electricity
The sliding end of position device RA1 is connected directly to the first input and output pin IO1 of microcontroller, i.e. V_ADC ends by conducting wire, by numeral
The sample voltage value Real-time Feedback of potentiometer RA1 is to microcontroller.Meanwhile the second input and output pin IO2 of microcontroller, i.e. R_
DAC ends, the sliding end of digital regulation resistance RA1 is connected to by conducting wire, by the magnitude of voltage according to digital regulation resistance RA1 Real-time Feedbacks
Effective resistance value after adjustment is sent to digital regulation resistance RA1, after digital regulation resistance RA1 receives effective resistance value, adjusts current potential
The internal resistance of control circuit RA, with the electric current in limiting circuit.For not possessing the microcontroller of analog-digital conversion function, digital regulation resistance
The sliding end of RA1 after analog to digital conversion circuit, can be then connected to the first input and output pin IO1 of microcontroller.Modulus turns
Circuit is changed to be used to the analog voltage of sampling being converted to digital voltage value.Second input and output pin IO2 of microcontroller passes through
D/A converting circuit is connected with the sliding end of digital regulation resistance RA1.D/A converting circuit is used to have the numeral of microcontroller output
Effect resistance value is converted to analog quantity.
As shown in figure 4, the high-end of digital regulation resistance RA1 can be connected by resistance R11 with power supply VDD.
The LED light control circuit that the embodiment provides, using being connected between power supply and LED light source in control of Electric potentials
Circuit, by sample voltage value Real-time Feedback to driving chip, and the effective resistance value returned according to driving chip, linear regulation current potential
The internal resistance of control circuit, the current value of LED light source is flowed through with control, and then controls the brightness of LED light source.With traditional metal-oxide-semiconductor
The control of driving LED light source is compared, and the LED light control circuit is using potential control circuit according to real-time voltage feedback control circuit
In current value, avoid burning out LED light because the current value in circuit is excessive, reduce the probability that LED light is burned.
Meanwhile the control circuit component is less, simple in structure, cost is low, and other electronic products on periphery are caused
Electromagnetic interference it is smaller.
Embodiment two
Another LED light control circuit is present embodiments provided, its circuit diagram is as shown in Figure 6.The LED of the present embodiment
The difference for the LED light control circuit that lamp control circuit is provided with above-described embodiment one is：The electricity of the LED light control circuit
Position control circuit includes voltage feedback circuit and potentiometer RA2.
Two input terminals of voltage feedback circuit are connected to the high-end and low side of potentiometer RA2, voltage feedback circuit
Output terminal be connected with the first input and output pin IO1 of driving chip U3.
The high-end of potentiometer RA2 is directly connected with power supply VDD or is connected by resistance R11 with power supply VDD.
The low side of potentiometer RA2 is directly connected to LED light source or connects LED light source by LED light source interface.The sliding end of potentiometer RA2
It is connected with the second input and output pin IO2 of driving chip.
Wherein, voltage feedback circuit includes the first divider resistance R12 and the second divider resistance R13 of series connection.Voltage Feedback
Circuit can have different connection modes.For example, one end of the first divider resistance R12 is connected with power supply VDD, the second partial pressure
One end of resistance R13 is connected with LED light source or LED light source interface.The public affairs of first divider resistance R12 and the second divider resistance R13
Connecting pin is connected with the first input and output pin IO1 of driving chip U3 altogether, to driving chip U3 feedback sample magnitudes of voltage.Or
The public connecting end of person, the first divider resistance R12 and the second divider resistance R13 and the first input and output pin of driving chip U3
IO1 connections, the other end of the first divider resistance R12 and the high-end connection of potentiometer RA2, the other end of the second divider resistance R13
It is connected with LED light source or LED light source interface.
In an embodiment, potentiometer RA2 can be digital regulation resistance.
The embodiment part identical with above-described embodiment one, is referred to embodiment one and realizes that details are not described herein.
Embodiment three
Another LED light control circuit is present embodiments provided, its circuit diagram is as shown in Figure 7.The LED of the present embodiment
The difference for the LED light control circuit that lamp control circuit is provided with above-described embodiment one is：The electricity of the LED light control circuit
Position control circuit is integrated digital regulation resistance chip RA3.Digital regulation resistance chip RA3 can use commercially available digital current potential
Device chip, can also use the number that making is voluntarily encapsulated according to the potential control circuit structure of above-described embodiment one and embodiment two
Word potentiometer chip.
Digital regulation resistance chip RA3 power pins connection power supply VDD, control output pin W connection LED light sources or
LED light source interface, the first input and output pin IO1 of feedback output pin VAD connection driving chips U3, data-out pin
The second input and output pin IO2 of RDA connection driving chips U3.
Similarly, the embodiment part identical with above-described embodiment one, is referred to embodiment one and realizes, no longer superfluous herein
State.
Example IV
Since the frame per second used when existing high definition camera is shot is up to 200Hz or so, using traditional LED light controlling party
Formula, shooting picture are highly prone to the interference of LED light stroboscopic.Existing high definition camera requires lamp control frequency height, but frequency as far as possible
In the case of height, and the problem of output waveform distortion can be brought.
High definition camera provided in this embodiment includes camera lens, fuselage, the LED light source being arranged on fuselage and above-mentioned
The LED light control circuit that one embodiment provides.Since the LED light control circuit does not use PWM waveform to control LED light source,
, therefore, can be against LED light stroboscopic using the high definition camera of the LED light control circuit there is no the stroboscopic problem of LED light
Interference, makes the image of shooting apparent.
The LED light control circuit and high definition camera that the utility model embodiment provides have identical technical characteristic, so
Also identical technical problem can be solved, reaches identical technique effect.
In addition, in the description of the utility model embodiment, unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can mechanically connect or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can
To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the utility model.
, it is necessary to explanation in the description of the utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or hint relative importance.
Finally it should be noted that：Embodiment described above, is only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the scope of protection of the utility model is not limited thereto, although with reference to foregoing
The utility model is described in detail in embodiment, it will be understood by those of ordinary skill in the art that：It is any to be familiar with this skill
For the technical staff in art field in the technical scope that the utility model discloses, it still can be to the skill described in previous embodiment
Art scheme is modified or can readily occur in change, or carries out equivalent substitution to which part technical characteristic；And these modifications,
Change is replaced, and the essence of appropriate technical solution is departed from the spirit and model of the utility model embodiment technical solution
Enclose, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model described should be wanted with right
Subject to the protection domain asked.
Claims (10)
1. a kind of LED light control circuit, it is characterised in that including potential control circuit and driving chip；The control of Electric potentials electricity
Road is used to be connected between power supply and LED light source, and the driving chip is connected with the potential control circuit；
The potential control circuit detects the magnitude of voltage between the power supply and the LED light source, and the magnitude of voltage is exported
To the driving chip；
After the driving chip receives the magnitude of voltage, effective resistance value is sent to the potential control circuit；
After the potential control circuit receives the effectively resistance value, the internal resistance of the potential control circuit is adjusted, to control stream
Electric current through LED light source.
2. circuit according to claim 1, it is characterised in that the potential control circuit includes digital regulation resistance, described
The high-end of digital regulation resistance is connected with power supply, and the low side of the digital regulation resistance is directly connected to LED light source or passes through LED light
Source interface connects LED light source；The sliding end of the digital regulation resistance and the input and output pin of driving chip connect.
3. circuit according to claim 2, it is characterised in that the high-end of the digital regulation resistance passes through resistance and power supply electricity
Source connects.
4. circuit according to claim 1, it is characterised in that the potential control circuit includes voltage feedback circuit and electricity
Position device；
Two input terminals of the voltage feedback circuit are connected to the high-end and low side of the potentiometer, the Voltage Feedback
The output terminal of circuit is connected with the first input and output pin of the driving chip；
The high-end of the potentiometer is connected with power supply；The low side of the potentiometer is directly connected to LED light source or passes through LED light
Source interface connects LED light source；The sliding end of the potentiometer is connected with the second input and output pin of the driving chip.
5. circuit according to claim 4, it is characterised in that the high-end of the potentiometer is connected by resistance and power supply
Connect.
6. circuit according to claim 5, it is characterised in that the voltage feedback circuit includes the first partial pressure electricity of series connection
Resistance and the second divider resistance；The first of the public connecting end of first divider resistance and the second divider resistance and the driving chip is defeated
Enter output pin connection, the other end of the first divider resistance is connected with power supply, the other end and LED light of the second divider resistance
Source or the connection of LED light source interface.
7. circuit according to claim 5, it is characterised in that the voltage feedback circuit includes the first partial pressure electricity of series connection
Resistance and the second divider resistance；The first of the public connecting end of first divider resistance and the second divider resistance and the driving chip is defeated
Enter output pin connection, the high-end connection of the other end of the first divider resistance and the potentiometer, the second divider resistance it is another
End is connected with LED light source or LED light source interface.
8. circuit according to claim 4, it is characterised in that the potentiometer is digital regulation resistance.
9. circuit according to claim 1, it is characterised in that the potential control circuit includes integrated digital current potential
Device chip；The power pins connection power supply of the digital regulation resistance chip, control output pin connection LED light source or LED
Light source interface, feedback output pin connect the first input and output pin of the driving chip, described in data-out pin connection
Second input and output pin of driving chip.
10. a kind of high definition camera, it is characterised in that including LED light source and LED light control according to any one of claims 1 to 9
Circuit processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256838.2U CN207266344U (en) | 2017-09-27 | 2017-09-27 | LED light control circuit and high definition camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256838.2U CN207266344U (en) | 2017-09-27 | 2017-09-27 | LED light control circuit and high definition camera |
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| Publication Number | Publication Date |
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| CN207266344U true CN207266344U (en) | 2018-04-20 |
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ID=61919796
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| CN201721256838.2U Active CN207266344U (en) | 2017-09-27 | 2017-09-27 | LED light control circuit and high definition camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285343A (en) * | 2019-06-05 | 2019-09-27 | 南昌大学 | A kind of infrared direct current of full spectrum benefit of electronic ink screen dims means of illumination |
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2017
- 2017-09-27 CN CN201721256838.2U patent/CN207266344U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285343A (en) * | 2019-06-05 | 2019-09-27 | 南昌大学 | A kind of infrared direct current of full spectrum benefit of electronic ink screen dims means of illumination |
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