CN103528677B - High-precision illumination detection circuit - Google Patents
High-precision illumination detection circuit Download PDFInfo
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- CN103528677B CN103528677B CN201310521187.5A CN201310521187A CN103528677B CN 103528677 B CN103528677 B CN 103528677B CN 201310521187 A CN201310521187 A CN 201310521187A CN 103528677 B CN103528677 B CN 103528677B
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- operational amplifier
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- thermistor
- resistor
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Abstract
The invention discloses a high-precision illumination detection circuit. The illumination detection circuit comprises a thermistor R1, an operational amplifier A1 and an operational amplifier A2, wherein one end of the thermistor R1 is grounded, the other end is connected to an inverted input end of the operational amplifier A1, and two ends of the thermistor R1 are in parallel connection with a resistor R2; a resistor R3 is connected between an output end and the inverted input end of the operational amplifier A1; the resistor R3 is in parallel connection with a photoconductive resistor R7; a resistor R4 is connected between the output end of the operational amplifier A1 and an inverted input end of the operational amplifier A2; a resistor R6 is connected between an output end and the inverted input end of the operational amplifier A2; in-phase input ends of both the operational amplifier A1 and the operational amplifier A2 are grounded; and the inverted input end of the operational amplifier A2 is also connected with a filter circuit. The illumination detection circuit has the advantages as follows: turning on and turning off of street lamps are controlled according to the light intensity, the driving safety is guaranteed, the circuit is provided with temperature compensation, and the detection precision is high.
Description
Technical field
The present invention relates to illumination observation circuit, relate to the lighting detecting circuit that a kind of precision is high in particular.
Background technology
When controlling the switch of roadside light, the general mode adopted utilizes control circuit to carry out time switch to it.But when the spring, summer, autumn and winter replaces time or change in weather, the change of light is difficult to ponder.Especially, when change in weather, light becomes suddenly very dark, and time by day, street lamp is not also to the time of opening, and dim light brings very large trouble by traffic safety, is especially in the section of heavy traffic.
Summary of the invention
The invention provides the lighting detecting circuit that a kind of precision is high, it controls according to the switch of the power of light to street lamp, ensure traffic safety, and with temperature compensation, the precision of detection is high.
For solving above-mentioned technical matters, the present invention by the following technical solutions:
The lighting detecting circuit that precision is high, it comprises thermistor R1, operational amplifier A 1 and operational amplifier A 2, one end ground connection of described thermistor R1, the other end is connected on the inverting input of operational amplifier A 1, and the two ends of thermistor R1 are parallel with resistance R2; Resistance R3 is connected with between the output terminal of described operational amplifier A 1 and reverse input end; Described resistance R3 is parallel with photoresistance R7; Resistance R4 is connected with between the output terminal of described operational amplifier A 1 and the reverse input end of operational amplifier A 2; Resistance R6 is connected with between the output terminal of described operational amplifier A 2 and inverting input; The equal ground connection of in-phase input end of described operational amplifier A 1 and operational amplifier A 2; The reverse input end of described operational amplifier A 2 is also connected with filtering circuit.
Further technical scheme is:
As preferably, the output terminal of described operational amplifier A 1 is connected with resistance R3, the other end ground connection of described resistance R3.
Further, the output terminal of described operational amplifier A 1 is connected with electric capacity C1, the other end ground connection of described electric capacity C1.
Further, described filtering circuit comprises resistance R5 and electric capacity C2, one end ground connection of described electric capacity C2, and the other end is connected with resistance R5, and the other end of described resistance R5 is connected on the reverse input end of operational amplifier A 2.
As preferably, the resistance of described resistance R4 is greater than 100K Ω.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention is connected in on-off circuit, and it controls follow-up on-off circuit according to the power of light, is opened by street lamp in time when insufficient light, ensures traffic safety.
2, circuit of the present invention is with temperature compensation, makes it high to the accuracy of detection of light, namely high to the control accuracy of street lamp.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
The lighting detecting circuit that precision is as shown in Figure 1 high, it comprises thermistor R1, operational amplifier A 1 and operational amplifier A 2, one end ground connection of described thermistor R1, the other end is connected on the inverting input of operational amplifier A 1, and the two ends of thermistor R1 are parallel with resistance R2; Resistance R3 is connected with between the output terminal of described operational amplifier A 1 and reverse input end; Described resistance R3 is parallel with photoresistance R7; Resistance R4 is connected with between the output terminal of described operational amplifier A 1 and the reverse input end of operational amplifier A 2; Resistance R6 is connected with between the output terminal of described operational amplifier A 2 and inverting input; The equal ground connection of in-phase input end of described operational amplifier A 1 and operational amplifier A 2; The reverse input end of described operational amplifier A 2 is also connected with filtering circuit.
In the present invention, utilize temperature compensation principle, thermistor R1 temperature and the proportional relation of resistance signal, utilize resistance signal to change the sensitivity of operational amplifier A 1, make the input voltage of operational amplifier A 1 temperature independent.The resistance of photoresistance R7 increases along with weakening of light, and the resistance value after photoresistance R7 and resistance R3 parallel connection is increased, thus changes output.Operational amplifier A 1 is a voltage follower, and resistance R3 can prevent external maximum transient input signal from operational amplifier protection circuit is damaged.Operational amplifier A 2 act as amplification voltage signal, so that drive subsequent conditioning circuit.Filtering circuit ensures the stable of voltage.Resistance R4 plays metering function, protects operational amplifier A 1 and operational amplifier A 2.
The output terminal of described operational amplifier A 1 is connected with resistance R3, the other end ground connection of described resistance R3.Resistance R3 is drop-down electric capacity, plays dividing potential drop effect.
In order to further eliminate the noise of circuit, the output terminal of described operational amplifier A 1 is connected with electric capacity C1, the other end ground connection of described electric capacity C1.
Described filtering circuit comprises resistance R5 and electric capacity C2, one end ground connection of described electric capacity C2, and the other end is connected with resistance R5, and the other end of described resistance R5 is connected on the reverse input end of operational amplifier A 2.
The resistance of described resistance R4 is greater than 100K Ω.Resistance R4 plays metering function, and its resistance is not easily too small.
Be embodiments of the invention as mentioned above.The present invention is not limited to above-mentioned embodiment, and anyone should learn the structure change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (3)
1. the lighting detecting circuit that precision is high, it is characterized in that: it comprises thermistor R1, operational amplifier A 1 and operational amplifier A 2, one end ground connection of described thermistor R1, the other end is connected on the inverting input of operational amplifier A 1, and the two ends of thermistor R1 are parallel with resistance R2; Resistance R3 is connected with between the output terminal of described operational amplifier A 1 and reverse input end; Described resistance R3 is parallel with photoresistance R7; Resistance R4 is connected with between the output terminal of described operational amplifier A 1 and the reverse input end of operational amplifier A 2; Resistance R6 is connected with between the output terminal of described operational amplifier A 2 and inverting input; The equal ground connection of in-phase input end of described operational amplifier A 1 and operational amplifier A 2; The reverse input end of described operational amplifier A 2 is also connected with filtering circuit, the output terminal of described operational amplifier A 1 is connected with resistance R3, the other end ground connection of described resistance R3, the resistance of described resistance R4 is greater than 100K Ω.
2. the lighting detecting circuit that precision according to claim 1 is high, is characterized in that: the output terminal of described operational amplifier A 1 is connected with electric capacity C1, the other end ground connection of described electric capacity C1.
3. the lighting detecting circuit that precision according to claim 2 is high, it is characterized in that: described filtering circuit comprises resistance R5 and electric capacity C2, one end ground connection of described electric capacity C2, the other end is connected with resistance R5, and the other end of described resistance R5 is connected on the reverse input end of operational amplifier A 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521187.5A CN103528677B (en) | 2013-10-30 | 2013-10-30 | High-precision illumination detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521187.5A CN103528677B (en) | 2013-10-30 | 2013-10-30 | High-precision illumination detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103528677A CN103528677A (en) | 2014-01-22 |
| CN103528677B true CN103528677B (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310521187.5A Expired - Fee Related CN103528677B (en) | 2013-10-30 | 2013-10-30 | High-precision illumination detection circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109164455A (en) * | 2018-10-17 | 2019-01-08 | 杭州隆硕科技有限公司 | A kind of phase distancemeter |
Citations (6)
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| CN101102630A (en) * | 2006-07-07 | 2008-01-09 | 陈汉湘 | Intelligent light time controller and control method for outdoor spotlight |
| CN101969725A (en) * | 2010-10-11 | 2011-02-09 | 复旦大学 | Intelligent general light-emitting diode (LED) street lamp illuminating power supply system |
| CN102215618A (en) * | 2010-04-09 | 2011-10-12 | 复旦大学 | LED (light emitting diode) street lamp driving circuit capable of regulating output illuminance automatically |
| CN202475874U (en) * | 2012-02-16 | 2012-10-03 | 任永斌 | Light-operated switch with operational amplifier in cooperation with silicon controlled rectifier |
| CN103199838A (en) * | 2013-02-16 | 2013-07-10 | 吴建堂 | Light dependent resistor manufacturing empty city strategy anti-theft device |
| CN203534701U (en) * | 2013-10-30 | 2014-04-09 | 成都市宏山科技有限公司 | Illumination detection circuit having temperature compensation function |
-
2013
- 2013-10-30 CN CN201310521187.5A patent/CN103528677B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102630A (en) * | 2006-07-07 | 2008-01-09 | 陈汉湘 | Intelligent light time controller and control method for outdoor spotlight |
| CN102215618A (en) * | 2010-04-09 | 2011-10-12 | 复旦大学 | LED (light emitting diode) street lamp driving circuit capable of regulating output illuminance automatically |
| CN101969725A (en) * | 2010-10-11 | 2011-02-09 | 复旦大学 | Intelligent general light-emitting diode (LED) street lamp illuminating power supply system |
| CN202475874U (en) * | 2012-02-16 | 2012-10-03 | 任永斌 | Light-operated switch with operational amplifier in cooperation with silicon controlled rectifier |
| CN103199838A (en) * | 2013-02-16 | 2013-07-10 | 吴建堂 | Light dependent resistor manufacturing empty city strategy anti-theft device |
| CN203534701U (en) * | 2013-10-30 | 2014-04-09 | 成都市宏山科技有限公司 | Illumination detection circuit having temperature compensation function |
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| CN103528677A (en) | 2014-01-22 |
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