CN103674241B - A kind of photosensitive circuit detecting photosensor signal - Google Patents
A kind of photosensitive circuit detecting photosensor signal Download PDFInfo
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- CN103674241B CN103674241B CN201310678817.XA CN201310678817A CN103674241B CN 103674241 B CN103674241 B CN 103674241B CN 201310678817 A CN201310678817 A CN 201310678817A CN 103674241 B CN103674241 B CN 103674241B
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Abstract
The present invention includes photodiode D1, photodiode D2 and amplifier U1, the negative electrode of photodiode D1 connects power supply VCC, the anode of described photodiode D1 is held by the negative level V-being connected to amplifier U1 after adjustable resistance R1 ground connection, the negative electrode of photodiode D2 connects power supply VCC, the anode of photodiode D2 connects the negative input end of amplifier by resistance R4, the positive level V+ that power supply VCC is connected to amplifier U1 by resistance R3 holds, the common port of resistance R4 and photodiode D2 is connected the resistance R2 of ground connection by wire, the positive input terminal of amplifier U1 is connected to the common port of resistance R1 and photodiode D1 by resistance R5, the common port of resistance R1 and photodiode D1 is also connected with the electric capacity C1 of ground connection by wire.Project organization of the present invention is simple, and can detect the power of two different illumination intensity accurately, testing result is accurate.
Description
Technical field
The present invention relates to a kind of photosensitive circuit detecting photosensor signal, belong to electricity field.
Background technology
Photosensitive circuit can convert light signal to digital signal, realizes analog to digital conversion; The photodiode of photosensitive circuit in use in circuit exports different voltage according to the change of intensity of illumination, this programme is by this characteristic, achieve and different illumination intensity is detected, thus the power difference of photosensor signal can be detected, be same as and regulate different intensities of illumination and regulate required intensity of illumination.
Summary of the invention
The invention provides a kind of photosensitive circuit detecting photosensor signal, using amplifier as comparer, for detecting the power of the intensity of illumination of two zoness of different, realize illumination to detect, thus the illumination of zones of different can be regulated, the testing circuit solved in the past for two different light is comparatively complicated, and the problem that Detection results is poor.
For solving above-mentioned technical matters, the present invention is by the following technical solutions: a kind of photosensitive circuit detecting photosensor signal, comprise photodiode D1, photodiode D2 and amplifier U1, the negative electrode of photodiode D1 connects power supply VCC, the anode of described photodiode D1 is held by the negative level V-being connected to amplifier U1 after adjustable resistance R1 ground connection, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier U1 by resistance R4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R3 holds, the common port of described resistance R4 and photodiode D2 is connected the resistance R2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of adjustable resistance R1 and photodiode D1 by resistance R5, the common port of described adjustable resistance R1 and photodiode D1 is also connected with the electric capacity C1 of ground connection by wire.
The positive input terminal of described amplifier U1 is also connected with the electric capacity C2 of ground connection.
The negative input end of described amplifier U1 is also connected with the electric capacity C3 of ground connection.
Described resistance R4 is equal with resistance R5 resistance.
Described amplifier U1 selects LM324 type amplifier.
Compared with prior art, the invention has the beneficial effects as follows: the photosensitive circuit of this detection photosensor signal of the present invention's design, not only structure is simple, and can detect the power of two different illumination intensity accurately, and testing result is accurate, effective.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment 1
A kind of photosensitive circuit detecting photosensor signal as shown in Figure 1, comprise photodiode D1, photodiode D2 and amplifier U1, the negative electrode of photodiode D1 connects power supply VCC, the anode of described photodiode D1 is held by the negative level V-being connected to amplifier U1 after adjustable resistance R1 ground connection, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier U1 by resistance R4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R3 holds, the common port of described resistance R4 and photodiode D2 is connected the resistance R2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of adjustable resistance R1 and photodiode D1 by resistance R5, the common port of described adjustable resistance R1 and photodiode D1 is also connected with the electric capacity C1 of ground connection by wire.
In the present embodiment, photodiode D1 and photodiode D2 is positioned at different light areas, intensity of illumination is different, the pressure drop of photodiode D1 and photodiode D2 is also different, the value of V1 and V2 is also different, amplifier U1 uses as comparer in circuit, photodiode D1 and photodiode D2 conducting under outside illumination, under the effect of external power source VCC, as voltage V2>V1, amplifier U1 forward is saturated, output voltage V, when close to supply voltage, is high level 1; As voltage V2<V1, amplifier U1 is oppositely saturated, powers owing to only employing single external power source VCC, and amplifier U1 output voltage V0=O V is low level 0; During photodiode D1 conducting, produce voltage V1, R1 changes the magnitude of voltage that resistance can be used for regulating V1, thus can meet different testing requirement, obtains different comparative voltages and Detection results; Intensity of illumination is converted into magnitude of voltage by the present embodiment, by comparing the different magnitudes of voltage of photodiode D1 and photodiode D2, quantitatively can detect magnitude of voltage, thus the intensity of illumination of two zoness of different can be compared, be convenient to detect and regulating illumination, by quantitatively detecting magnitude of voltage, comparison illumination is carried out detecting more directly, accurately, testing result is accurate, effective, and C1 has the effect of filtering, can interference be reduced, improve accuracy of detection.
Embodiment 2
The present embodiment adds following structure on the basis of embodiment 1: the positive input terminal of described comparer U1 is also connected with the electric capacity C2 of ground connection.
In the present embodiment, electric capacity C2 can eliminate the interference of voltage V1, improves stability and the accuracy of V1 voltage, thus ensures to detect accurately.
Embodiment 3
The present embodiment adds following structure on the basis of embodiment 1 or embodiment 2: the negative input end of described comparer U1 is also connected with the electric capacity C3 of ground connection.
The effect of the present embodiment electric capacity C3 is identical with electric capacity C2, effectively can eliminate the interference of V2, improves stability and the accuracy of V2 voltage, thus ensures to detect accurately.
Embodiment 4
The present embodiment has done following optimization on the basis of above-mentioned any embodiment: described resistance R4 is equal with resistance R5 resistance.
The present embodiment resistance R4 is equal with resistance R5 resistance, and both guarantees place circuit can simultaneously conducting, ensures that detection can normally be carried out, can not because of the problem that cannot detect when photodiode D1 and photodiode D2 different light.
Embodiment 5
Embodiment 5 is optimum embodiment of the present invention
The present embodiment has done following optimization on the basis of above-mentioned any embodiment: described amplifier U1 selects LM324 type amplifier.
In the present embodiment LM358 type amplifier include two independently, high-gain, internal frequency compensate dual operational amplifier, price is low, excellent performance, can improve the gain of signal amplification circuit.
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 (5)
1. one kind is detected the photosensitive circuit of photosensor signal, it is characterized in that: comprise photodiode D1, photodiode D2 and amplifier U1, the negative electrode of photodiode D1 connects power supply VCC, the anode of described photodiode D1 is held by the negative level V-being connected to amplifier U1 after adjustable resistance R1 ground connection, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier U1 by resistance R4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R3 holds, the common port of described resistance R4 and photodiode D2 is connected the resistance R2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of adjustable resistance R1 and photodiode D1 by resistance R5, the common port of described adjustable resistance R1 and photodiode D1 is also connected with the electric capacity C1 of ground connection by wire.
2. a kind of photosensitive circuit detecting photosensor signal according to claim 1, is characterized in that: the positive input terminal of described amplifier U1 is also connected with the electric capacity C2 of ground connection.
3. a kind of photosensitive circuit detecting photosensor signal according to claim 1, is characterized in that: the negative input end of described amplifier U1 is also connected with the electric capacity C3 of ground connection.
4. a kind of photosensitive circuit detecting photosensor signal according to claim 1, is characterized in that: described resistance R4 is equal with resistance R5 resistance.
5. a kind of photosensitive circuit detecting photosensor signal according to claim 1, is characterized in that: described amplifier U1 selects LM324 type amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310678817.XA CN103674241B (en) | 2013-12-14 | 2013-12-14 | A kind of photosensitive circuit detecting photosensor signal |
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| CN201310678817.XA CN103674241B (en) | 2013-12-14 | 2013-12-14 | A kind of photosensitive circuit detecting photosensor signal |
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| CN103674241A CN103674241A (en) | 2014-03-26 |
| CN103674241B true CN103674241B (en) | 2015-08-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106531815A (en) * | 2016-09-30 | 2017-03-22 | 深圳市磊立捷光电有限公司 | Visible light sensor |
| CN109309490A (en) * | 2018-12-04 | 2019-02-05 | 苏州东剑智能科技有限公司 | Key circuit |
| CN113325749A (en) * | 2021-05-07 | 2021-08-31 | 兰玉华 | Control circuit of protective curtain device of angiography machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5959291A (en) * | 1997-06-27 | 1999-09-28 | Caliper Technologies Corporation | Method and apparatus for measuring low power signals |
| CN101769790B (en) * | 2008-12-29 | 2011-11-30 | 达尔科技股份有限公司 | Photosensitive device with range |
| CN102262408A (en) * | 2010-05-24 | 2011-11-30 | 上海光辕新能源科技有限公司 | Accuracy-adaptive solar automatic tracking sensor based on sunlight intensity induction |
| CN203116851U (en) * | 2013-03-28 | 2013-08-07 | 嘉兴市英力电子科技有限公司 | Improved photosensitive sensor circuit |
| CN203745082U (en) * | 2013-12-14 | 2014-07-30 | 成都国蓉科技有限公司 | Photosensitive circuit for detecting photosensitive signals |
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Address after: 610000 No. 2 Tianyu Road, hi tech Zone, Sichuan, Chengdu Patentee after: Rong Rong Technology Co., Ltd. Address before: 610000 No. 2 Tianyu Road, hi tech Zone, Sichuan, Chengdu Patentee before: CHENGDU GUORONG TECHNOLOGY CO., LTD. |