CN205808551U - Photoinduction hysteresis control circuit and comprise portable illuminometer and the video camera of this circuit - Google Patents
Photoinduction hysteresis control circuit and comprise portable illuminometer and the video camera of this circuit Download PDFInfo
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- CN205808551U CN205808551U CN201620562862.8U CN201620562862U CN205808551U CN 205808551 U CN205808551 U CN 205808551U CN 201620562862 U CN201620562862 U CN 201620562862U CN 205808551 U CN205808551 U CN 205808551U
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Abstract
The utility model discloses a kind of photoinduction hysteresis control circuit and the portable illuminometer comprising this circuit and video camera, light line detection circuit that the described photoinduction hysteresis control circuit with temperature-compensating includes being sequentially connected, temperature-compensation circuit, amplifying circuit, microprocessor, infrared LED；Described smooth line detection circuit is in order to detect environment light source illumination and to export a corresponding current signal；The current signal that light line detection circuit exports is converted into the stable voltage signal of excess temperature compensation and gives amplifying circuit by described temperature-compensation circuit；Microprocessor given by amplifying circuit after being amplified by this voltage signal, the voltage signal received is converted to digital signal by microprocessor；Again this digital signal is compared with the threshold value preset, export corresponding control signal to control being turned on and off of infrared LED according to comparative result.The described photoinduction hysteresis control circuit with temperature-compensating have, data acquisition little by external interference accurately, switching point control accurate feature.
Description
Technical field
This utility model relates to a kind of ON-OFF control circuit, and a kind of photoinduction sluggishness with temperature-compensating controls
Circuit, and comprise portable illuminometer and the video camera of this circuit.
Background technology
At the web camera product of security protection industry, due to needs colour imaging on daytime, entered in the evening by infrared LED light filling
Row black and white imaging.So need the change of a kind of light-sensitive device detection light, and then carry out follow-up relevant control operation.
Tradition photoinduction method, as it is shown in figure 1, carry out infrared LED closedown etc. when light is from weak to strong more than A point when
Action；When light is carried out the actions such as infrared LED unlatching by the when of by force to weak change.But this method has a lot of drawbacks,
Such as when environment light source illumination changes back and forth when, infrared LED is caused to open and close the most back and forth.
It is unstable that the scheme with hysteresis after industry uses the improvement shown in Fig. 2 at present solves external light, makes
Become the problem that infrared LED toggles.When light changes from weak to strong when, it is higher than B point just closes infrared LED, when light is by by force
It is less than A when of dying down and just opens infrared LED.So when the scope of ambient change is not more than △ when, would not
Cause the problem that infrared LED toggles.
In order to realize the function of Fig. 2, Fig. 3 is existing frequently-used control circuit, and D21 is photosensitive three poles meeting ROHS standard
Tube device, U16 is amplifier device, and U16-1 realizes being converted to the current signal of light-sensitive device output the amplification of voltage signal,
U16-2 realizes the realization to light switching point lag function.
The scheme of Fig. 3 mainly uses the scheme of simulation amplifier to realize, and there is amplification and switching point is not easy essence
The problem really controlled.And once the device of hardware is fixed up, it is impossible to revise switching point by the way of software easily.By
Bigger in the electric current temperature influence of light-sensitive device, the when of the change of such ambient temperature, also can affect the correct work of circuit
Make, cause the jitter inaccuracy delivering to amplifying circuit.Additionally peripheral components is the most, and cost is the highest.
Utility model content
The purpose of this utility model is the simple illumination proposing a kind of photoinduction hysteresis control circuit and comprising this circuit
Meter and video camera, be not easy accurately to control with the amplification and switching point solving the existence of above-mentioned prior art, peripheral components
The most, relatively costly and circuit is affected the technical problems such as big by ambient temperature.
To this end, the utility model proposes a kind of photoinduction hysteresis control circuit with temperature-compensating, including: light detects
Circuit, described smooth line detection circuit is in order to detect environment light source illumination and to export a corresponding current signal；Should mend with temperature
Temperature-compensation circuit that the photoinduction hysteresis control circuit repaid also includes being sequentially connected with, amplifying circuit, microprocessor, infrared LED；
The current signal that light line detection circuit exports is converted into the stable voltage letter that excess temperature compensates by described temperature-compensation circuit
Number give amplifying circuit；Amplifying circuit gives microprocessor after being amplified by this voltage signal；Microprocessor will receive
Voltage signal is converted to digital signal；Again this digital signal is compared with the threshold value preset, export phase according to comparative result
The control signal answered is to control being turned on and off of infrared LED.
Preferably, light line detection circuit includes: VDD5V power supply, resistance R2, light-sensitive device；One end of described resistance R2 with
VDD5V power supply is connected, and the other end is connected with light-sensitive device；The other end of light-sensitive device respectively with described temperature-compensation circuit and
Amplifying circuit is connected.
It is further preferred that described resistance R2 uses the resistance of 1% precision, 1/4W, play pressure stabilization function in circuit, prevent
VDD 5V power supply momentary pulse big voltage damage light-sensitive device.
It is further preferred that described light-sensitive device is current type light-sensitive device, change for induced environment light illumination, bag
Include light sensitive diode, phototriode, photodiode.
Preferably, described temperature-compensation circuit includes: critesistor RT1, resistance R1, resistance R3；Described critesistor RT1
One end be connected with light-sensitive device and amplifying circuit respectively, the other end is connected with resistance R1, the other end ground connection of resistance R1；Electricity
Resistance R3 is connected in parallel on the two ends of critesistor RT1.
Preferably, described amplifying circuit includes: VDD3.3V power supply, amplifier, resistance R4, resistance R5；The 3rd of amplifier
Foot is connected with temperature-compensation circuit and light-sensitive device respectively；4th foot of amplifier is connected with resistance R4, R5 respectively；Resistance R4's
Other end ground connection；The other end of resistance R5 is connected with the 1st foot and the microprocessor of amplifier respectively；5th foot of amplifier with
VDD3.3V power supply is connected, the 2nd foot ground connection of amplifier.
Put it is further preferred that described amplifier is single channel, high input impedance, rail-to-rail input and output voltage feedback-type
Big device.
Preferably, described microprocessor storage has first threshold A and Second Threshold B；When light changes from weak to strong, microprocessor
When ADC numerical value after conversion is more than Second Threshold B, microprocessor sends control infrared LED shutdown signal；When light is by becoming by force
Weak, microprocessor conversion after ADC numerical value less than first threshold A time, microprocessor send control infrared LED open signal.
This utility model also proposes a kind of photoinduction sluggishness with temperature-compensating comprised described in any of the above-described item and controls
The portable illuminometer of circuit, described portable illuminometer also includes display controller and display screen；Described display controller respectively with
Microprocessor is connected with display screen；Described microprocessor has also stored luxmeter, and this luxmeter establishes light illumination and Wei Chu
The one-to-one relationship of the ADC numerical value after reason device conversion；Display screen can show microprocessor conversion after ADC numerical value and with
The light illumination value that described ADC numerical value is corresponding.
This utility model also proposes a kind of photoinduction sluggishness with temperature-compensating comprised described in any of the above-described item and controls
The video camera of circuit.
The beneficial effects of the utility model are:
Photoinduction hysteresis control circuit with temperature-compensating of the present utility model, by temperature-compensation circuit by photosensor
The current signal of part detection is converted to the most accurate and stable voltage signal；Carry out in-phase proportion through amplifying circuit again to put
Greatly, send into micro-process and be converted to digital signal, by comparing with default threshold value, according to the corresponding control of comparative result output
Signal processed is to control being turned on and off of infrared LED, and such switching point controls more accurate, can solve available light and red
Outer LED opens the accuracy that switching point is controlled by back reflection infrared light, the convenient control controlling infrared LED.
In preferred version of the present utility model, also have the advantages that
The luxmeter storage of the ADC numerical value one-to-one relationship after can changing establishing light illumination with microprocessor
In the microprocessor, when circuit real time operation when, the numerical value during the numerical value of ADC can be preset with microprocessor compares
Relatively, can find the illumination numerical value of correspondence, brightness value shows on a display screen, so can serve as an easy illumination
Meter uses.
Accompanying drawing explanation
Fig. 1 is tradition photoinduction control method schematic diagram in prior art；
Fig. 2 is the photoinduction control method schematic diagram in prior art with hysteresis；
Fig. 3 is photoinduction hysteresis control circuit schematic diagram commonly used in the prior art；
Fig. 4 is this utility model embodiment compositional block diagram；
Fig. 5 this utility model embodiment circuit diagram.
Detailed description of the invention
Below in conjunction with detailed description of the invention and compare accompanying drawing this utility model is described in further detail.It should be emphasized that
It is, that the description below is merely exemplary rather than in order to limit the scope of the present invention and application thereof.
Refer to Fig. 4, Fig. 4 is this utility model embodiment photoinduction hysteresis control circuit composition side with temperature-compensating
Block diagram.
First this utility model proposes a kind of photoinduction hysteresis control circuit with temperature-compensating, including: light detects
Circuit, described smooth line detection circuit is in order to detect environment light source illumination and to export a corresponding current signal；Should mend with temperature
Temperature-compensation circuit that the photoinduction hysteresis control circuit repaid also includes being sequentially connected with, amplifying circuit, microprocessor, infrared LED；
The current signal that light line detection circuit exports is converted into the stable voltage letter that excess temperature compensates by described temperature-compensation circuit
Number give amplifying circuit；Amplifying circuit gives microprocessor after being amplified by this voltage signal；Microprocessor will receive
Voltage signal is converted to digital signal；This digital signal is compared with the threshold value preset, corresponding according to comparative result output
Control signal to control being turned on and off of infrared LED.
Refer to Fig. 5, Fig. 5 is this utility model embodiment light photoinduction hysteresis control circuit figure with temperature-compensating.
As it is shown in figure 5, light line detection circuit includes: VDD5V power supply, resistance R2, light-sensitive device；One end of described resistance R2
Being connected with VDD5V power supply, the other end is connected with light-sensitive device；The other end of light-sensitive device respectively with described temperature-compensation circuit with
And amplifying circuit is connected.
Described resistance R2 uses the resistance of 1% precision, 1/4W, plays pressure stabilization function in circuit, prevents VDD5V power supply moment
Pulse big voltage damage light-sensitive device.
Described light-sensitive device is current type light-sensitive device, for induced environment light illumination change, including light sensitive diode,
Phototriode, photodiode.
Temperature-compensation circuit includes: critesistor RT1, resistance R1, resistance R3；One end of described critesistor RT1 is respectively
Being connected with light-sensitive device and amplifying circuit, the other end is connected with resistance R1, the other end ground connection of resistance R1；Resistance R3 is connected in parallel on
The two ends of critesistor RT1.
Light-sensitive device has positive temperature coefficient, and temperature rises High Output Current and strengthens.Resistance RT1 in Fig. 5 is NTC
(Negative Temperature Coefficient negative temperature coefficient) resistance, along with the increase resistance value of temperature reduces.This
Sample raises when temperature, and photosensor output electric current I strengthens, but NTC RT1 resistance reduces, and then the RP of equivalence reduces, such U=
The numerical value of I*RP tends to constant.
Amplifying circuit U1A includes: VDD3.3V power supply, amplifier, resistance R4, resistance R5；3rd foot of amplifier respectively with
Temperature-compensation circuit is connected with light-sensitive device；4th foot of amplifier is connected with resistance R4, R5 respectively；Another termination of resistance R4
Ground；The other end of resistance R5 is connected with the 1st foot and the microprocessor of amplifier respectively；5th foot of amplifier and VDD3.3V power supply
It is connected, the 2nd foot ground connection of amplifier.
Described amplifier is single channel, high input impedance, rail-to-rail input and output voltage feedback-type amplifier.
Owing to general light-sensitive device output electric current I is less, if equivalent resistance RP is excessive, such U=I*RP is easier to be subject to
To interference.The resistance of general RP can not obtain very big, and the numerical value so causing U is typically small.
U is input to the positive terminal of amplifier, and resistance R5 and R4 connects negative phase end and the outfan of amplifier, constitutes one together
Phase Proportion amplifying circuit, is so amplified U voltage, UOUT=U* (1+R5/R4).
Microprocessor storage has first threshold A and Second Threshold B；ADC when light changes from weak to strong, after microprocessor conversion
When numerical value is more than Second Threshold B, microprocessor sends control infrared LED shutdown signal；When light is by dying down by force, and microprocessor turns
When ADC numerical value after changing is less than first threshold A, microprocessor sends control infrared LED and opens signal.
UOUTThe ADC interface being connected to microprocessor chip is converted into digital signal, and the digital signal after conversion just represents
Current light illumination.Thus establish the one-to-one relationship of numerical value after light illumination and ADC digital.
Refer to table 1.Table 1 is the one-to-one relationship table of numerical value after light illumination and ADC digital.Table 1 is by random
Choose the data of 7 light-sensitive device tests, by calculating meansigma methods: when 2lx infrared LED is closed, test ADC meansigma methods is 118,
When 6lx infrared LED is opened, test ADC meansigma methods is 514.That is: light illumination is when 2lx, in the case of not opening infrared lamp, its
The meansigma methods of 7 groups of ADC is 118, can turn the ADC value of black and white for 115 with setting color, and the light illumination scope of its correspondence exists
Within 1.5lx～2.5lx；Light illumination is when 6lx, and in the case of opening infrared lamp, the meansigma methods of its 7 groups of ADC is 514.5,
Can set black and white and turn colored ADC value as 515, the light illumination scope of its correspondence is within 5.5lx～6.5lx.
The numerical value of the threshold value A so microprocessor preset is scheduled on 118 (2LX), and the numerical value of threshold value B preset is scheduled on 514
(6LX).When light is by secretly brightening, when ADC real time value is more than B point value, microprocessor sends switch controlling signal and cuts out red
Outer LED；When light by bright dimmed when, ADC numerical value less than A point value time, microprocessor send switch controlling signal open
Infrared LED.
The one-to-one relationship table of numerical value after table 1 light illumination and ADC digital
Work process with the photoinduction hysteresis control circuit of temperature-compensating is:
Circuit powers on after starting working, and light-sensitive device is under the irradiation of light, and the outfan at light-sensitive device has electric current I defeated
Go out；
Electric current I produces voltage U=I*RP after flowing through the equivalent resistance RP of temperature-compensation circuit RT1/R3/R1；
This voltage signal amplified circuit in-phase proportion produces an output voltage U after amplifyingOUT, UOUT=U* (1+R5/R4)；
Voltage UOUTIt is connected to microprocessor, after analog digital conversion, is converted to digital signal；Microprocessor is to this numeral
Signal carries out sluggish point and judges, it may be assumed that this digital signal is compared by microprocessor with the threshold value A preset and B, sends control and opens
OFF signal controls the opening and closing of infrared LED.When light changes from weak to strong, the ADC numerical value after microprocessor conversion is more than second
During threshold value B, microprocessor sends control infrared LED shutdown signal；ADC number when light is by dying down by force, after microprocessor conversion
When value is less than first threshold A, microprocessor sends control infrared LED and opens signal.
This utility model also proposes a kind of photoinduction sluggishness with temperature-compensating comprised described in any of the above-described item and controls
The portable illuminometer of circuit, described portable illuminometer also includes display controller and display screen；Described display controller respectively and
Microprocessor is connected with display screen；Described microprocessor has also stored luxmeter, and this luxmeter establishes light illumination and Wei Chu
The one-to-one relationship of the ADC numerical value after reason device conversion；Display screen can show microprocessor conversion after ADC numerical value and with
The light illumination value that described ADC numerical value is corresponding.
The ADC numerical value of table 1 can be stored in the ROM of microprocessor, when circuit real time operation when, and the numerical value of ADC
Can compare with the numerical value in ROM, can find the illumination numerical value of correspondence, brightness value shows on a display screen, so
Can also use as an easy illumination meter.
This utility model also proposes a kind of photoinduction sluggishness with temperature-compensating comprised described in any of the above-described item and controls
The video camera of circuit.
Photoinduction hysteresis control circuit with temperature-compensating of the present utility model uses hardware and microprocessor to combine
Method, light-sensitive device produce electric current flow through temperature-compensation circuit after become voltage signal, through amplifying circuit amplify and ADC
After process, microprocessor carries out the judgement of sluggish point, and then controls the work of infrared LED.There is circuit little by external interference, several
According to gathering accurate, the switching point accurate feature of control.
Above content is to combine concrete/preferred embodiment further detailed description of the utility model,
It cannot be assumed that of the present utility model being embodied as is confined to these explanations.Common for this utility model art
For technical staff, without departing from the concept of the premise utility, these embodiments having described that can also be made by it
Some replacements or modification, and these substitute or variant all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. with a photoinduction hysteresis control circuit for temperature-compensating, including light line detection circuit, described smooth line detection circuit
In order to detect environment light source illumination and to export a corresponding current signal, it is characterised in that: should be with the photoinduction of temperature-compensating
Temperature-compensation circuit that hysteresis control circuit also includes being sequentially connected with, amplifying circuit, microprocessor, infrared LED；Described temperature is mended
Repay circuit the current signal that light line detection circuit exports is converted into excess temperature compensate stable voltage signal give amplification
Circuit；Amplifying circuit gives microprocessor after being amplified by this voltage signal；The voltage signal received is turned by microprocessor
It is changed to digital signal；Again this digital signal is compared with the threshold value preset, control letter accordingly according to comparative result output
Number to control being turned on and off of infrared LED.
2. as claimed in claim 1 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described light is examined
Slowdown monitoring circuit includes: VDD5V power supply, resistance R2, light-sensitive device；One end of described resistance R2 is connected with VDD5V power supply, the other end with
Light-sensitive device is connected；The other end of light-sensitive device is connected with described temperature-compensation circuit and amplifying circuit respectively.
3. as claimed in claim 2 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described resistance R2
Use the resistance of 1% precision, 1/4W, play pressure stabilization function in circuit, prevent the VDD 5V big voltage of power supply momentary pulse from damaging light
Sensing device.
4. as claimed in claim 2 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described photosensor
Part is current type light-sensitive device, changes for induced environment light illumination, including light sensitive diode, phototriode, photoelectricity two
Pole is managed.
5. as claimed in claim 1 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described temperature is mended
Repay circuit to include: critesistor RT1, resistance R1, resistance R3；One end of described critesistor RT1 respectively with light-sensitive device and
Amplifying circuit is connected, and the other end is connected with resistance R1, the other end ground connection of resistance R1；Resistance R3 is connected in parallel on critesistor RT1's
Two ends.
6. as claimed in claim 1 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described amplification electricity
Road includes: VDD3.3V power supply, amplifier, resistance R4, resistance R5；3rd foot of amplifier respectively with temperature-compensation circuit and photosensitive
Device is connected；4th foot of amplifier is connected with resistance R4, R5 respectively；The other end ground connection of resistance R4；The other end of resistance R5 divides
It is not connected with the 1st foot and the microprocessor of amplifier；5th foot of amplifier is connected with VDD3.3V power supply, the 2nd foot of amplifier
Ground connection.
7. as claimed in claim 6 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described amplifier
For single channel, high input impedance, rail-to-rail input and output voltage feedback-type amplifier.
8. as claimed in claim 1 with the photoinduction hysteresis control circuit of temperature-compensating, it is characterised in that: described micro-process
Device storage has first threshold A and Second Threshold B；When light changes from weak to strong, the ADC numerical value after microprocessor conversion is more than the second threshold
During value B, microprocessor sends control infrared LED shutdown signal；ADC numerical value when light is by dying down by force, after microprocessor conversion
During less than first threshold A, microprocessor sends control infrared LED and opens signal.
9. the simple photograph of the photoinduction hysteresis control circuit with temperature-compensating comprised described in any one of claim 1-8
Degree meter, it is characterised in that: described portable illuminometer also includes display controller and display screen；Described display controller is respectively with micro-
Processor is connected with display screen；Described microprocessor has also stored luxmeter, and this luxmeter establishes light illumination and micro-process
The one-to-one relationship of the ADC numerical value after device conversion；Display screen can show microprocessor conversion after ADC numerical value and with institute
State the light illumination value that ADC numerical value is corresponding.
10. the shooting of the photoinduction hysteresis control circuit with temperature-compensating comprised described in any one of claim 1-8
Machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620562862.8U CN205808551U (en) | 2016-06-08 | 2016-06-08 | Photoinduction hysteresis control circuit and comprise portable illuminometer and the video camera of this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620562862.8U CN205808551U (en) | 2016-06-08 | 2016-06-08 | Photoinduction hysteresis control circuit and comprise portable illuminometer and the video camera of this circuit |
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| Publication Number | Publication Date |
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| CN205808551U true CN205808551U (en) | 2016-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620562862.8U Active CN205808551U (en) | 2016-06-08 | 2016-06-08 | Photoinduction hysteresis control circuit and comprise portable illuminometer and the video camera of this circuit |
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| CN (1) | CN205808551U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107560728A (en) * | 2017-08-23 | 2018-01-09 | 江苏泽景汽车电子股份有限公司 | A kind of ambient light detection circuit for HUD |
-
2016
- 2016-06-08 CN CN201620562862.8U patent/CN205808551U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107560728A (en) * | 2017-08-23 | 2018-01-09 | 江苏泽景汽车电子股份有限公司 | A kind of ambient light detection circuit for HUD |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhao Dengchao Inventor after: Hu Leigang Inventor before: Hu Leigang |
|
| COR | Change of bibliographic data |