CN203745082U - Photosensitive circuit for detecting photosensitive signals - Google Patents
Photosensitive circuit for detecting photosensitive signals Download PDFInfo
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- CN203745082U CN203745082U CN201320820122.6U CN201320820122U CN203745082U CN 203745082 U CN203745082 U CN 203745082U CN 201320820122 U CN201320820122 U CN 201320820122U CN 203745082 U CN203745082 U CN 203745082U
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- amplifier
- photodiode
- photosensitive
- resistance
- resistor
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Abstract
A photosensitive circuit for detecting photosensitive signals comprises a photosensitive diode D1, a photosensitive diode D2 and an amplifier U1. The cathode of the photosensitive diode D1 is connected with a power source VCC. The anode of the photosensitive diode D1 is grounded through an adjustable resistor R1 and then is connected to the negative level end V- of the amplifier U1. The cathode of the photosensitive diode D2 is connected with the power source VCC. The anode of the photosensitive diode D2 is connected with the negative input end of the amplifier through a resistor R4. The power source VCC is connected to the positive level end V+ of the amplifier U1 through a resistor R3. The common terminal of the resistor R4 and the photosensitive diode D2 is connected to a grounded resistor R2 through a lead. The positive input end of the amplifier U1 is connected to the common terminal of the resistor R1 and the photosensitive diode D1 through a resistor R5. The common terminal of the resistor R1 and the photosensitive diode D1 is also connected with a grounded capacitor C1 through a lead. By the adoption of the photosensitive circuit for detecting the photosensitive signal, the design and the structure are simple, the difference between two different illumination intensities can be accurately detected, and the detection result is accurate.
Description
Technical field
The utility model relates to a kind of photosensitive circuit detecting for photosensor signal, belongs to electricity field.
Background technology
Photosensitive circuit can convert light signal to digital signal, realizes analog to digital conversion; The photosensitive circuit in use photodiode in circuit is exported different voltage according to the variation of intensity of illumination, this programme is by this characteristic, realized different illumination intensity has been detected, thereby can detect the power difference of photosensor signal, be same as and regulate different intensities of illumination and regulate required intensity of illumination.
Utility model content
The utility model provides a kind of photosensitive circuit detecting for photosensor signal, by amplifier device as a comparison, power for detection of the intensity of illumination of two zoness of different, realizing illumination detects, thereby can regulate the illumination of zones of different, solved in the past comparatively complicatedly for the testing circuit of two different light, and detected the poor problem of effect.
For solving above-mentioned technical matters, the utility model is by the following technical solutions: the photosensitive circuit detecting for photosensor signal, comprise photodiode D1, photodiode D2 and amplifier U1, the negative electrode of photodiode D1 connects power supply VCC, the negative level V-that the anode of described photodiode D1 is connected to amplifier U1 after by adjustable resistance R1 ground connection holds, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier by resistance R 4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R 3 holds, the common port of described resistance R 4 and photodiode D2 is connected the resistance R 2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of resistance R 1 and photodiode D1 by resistance R 5, the common port of described resistance R 1 and photodiode D1 is also connected with the capacitor C 1 of ground connection by wire.
The positive input terminal of described amplifier U1 is also connected with the capacitor C 2 of ground connection.
The negative input end of described amplifier U1 is also connected with the capacitor C 3 of ground connection.
Described resistance R 4 and resistance R 5 resistances equate.
Described amplifier is selected LM324 type amplifier.
Compared with prior art, the beneficial effects of the utility model are: this photosensitive circuit detecting for photosensor signal of the utility model design, and not only simple in structure, and can detect accurately the power of two different illumination intensity, testing result is accurate, effective.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Embodiment 1
The photosensitive circuit detecting for 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 negative level V-that the anode of described photodiode D1 is connected to amplifier U1 after by adjustable resistance R1 ground connection holds, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier by resistance R 4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R 3 holds, the common port of described resistance R 4 and photodiode D2 is connected the resistance R 2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of resistance R 1 and photodiode D1 by resistance R 5, the common port of described resistance R 1 and photodiode D1 is also connected with the capacitor C 1 of ground connection by wire.
In the present embodiment, photodiode D1 and photodiode D2 are 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 is device use as a comparison in circuit, externally conducting under illumination of photodiode D1 and photodiode D2, externally under the effect of power supply VCC, when voltage V2>V1, amplifier U1 forward is saturated, output voltage V, when approaching supply voltage, is high level 1; When voltage V2<V1, amplifier U1 is oppositely saturated, and owing to only having used single external power source VCC power supply, amplifier U1 output voltage V 0=O V, is low level 0; During photodiode D1 conducting, produce voltage V1, R1 changes resistance and can be used for regulating the magnitude of voltage of V1, thereby can meet different testing requirements, obtains different comparative voltages and detects effect; The present embodiment is converted into magnitude of voltage by intensity of illumination, different magnitudes of voltage by comparison photodiode D1 and photodiode D2, can quantitatively detect magnitude of voltage, thereby can compare the intensity of illumination of two zoness of different, be convenient to detect and regulating illumination, by magnitude of voltage is quantitatively detected, comparison illumination detects more direct, accurate, and testing result is accurate, effective, and C1 has the effect of filtering, can reduce interference, improve accuracy of detection.
Embodiment 2
The present embodiment has increased following structure on the basis of embodiment 1: the positive input terminal of described comparer U1 is also connected with the capacitor C 2 of ground connection.
In the present embodiment, capacitor C 2 can be eliminated the interference of voltage V1, improves stability and the accuracy of V1 voltage, thereby guarantees to detect accurately.
Embodiment 3
The present embodiment has increased following structure on the basis of embodiment 1 or embodiment 2: the negative input end of described comparer U1 is also connected with the capacitor C 3 of ground connection.
The effect of the present embodiment capacitor C 3 is identical with capacitor C 2, can effectively eliminate the interference of V2, improves stability and the accuracy of V2 voltage, thereby guarantees to detect accurately.
Embodiment 4
The present embodiment has been done following optimization on the basis of above-mentioned arbitrary embodiment: described resistance R 4 and resistance R 5 resistances equate.
The present embodiment resistance R 4 and resistance R 5 resistances equate, guarantee the conducting simultaneously of the two place circuit, guarantee to detect and can normally carry out, the problem that cannot detect in the time of can be because of photodiode D1 and photodiode D2 different light.
Embodiment 5
Embodiment 5 is optimum embodiment of the present utility model
The present embodiment has been done following optimization on the basis of above-mentioned arbitrary embodiment: described comparer is selected LM324 type comparer.
In the present embodiment LM358 type amplifier include two independently, the dual operational amplifier of high-gain, internal frequency compensation, price is low, excellent performance, the gain that can improve signal amplification circuit.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection domain of the present utility model.
Claims (5)
1. the photosensitive circuit detecting for 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 negative level V-that the anode of described photodiode D1 is connected to amplifier U1 after by adjustable resistance R1 ground connection holds, the negative electrode of described photodiode D2 connects power supply VCC, the anode of described photodiode D2 connects the negative input end of amplifier by resistance R 4, the positive level V+ that described power supply VCC is connected to amplifier U1 by resistance R 3 holds, the common port of described resistance R 4 and photodiode D2 is connected the resistance R 2 of ground connection by wire, the positive input terminal of described amplifier U1 is connected to the common port of resistance R 1 and photodiode D1 by resistance R 5, the common port of described resistance R 1 and photodiode D1 is also connected with the capacitor C 1 of ground connection by wire.
2. the photosensitive circuit detecting for photosensor signal according to claim 1, is characterized in that: the positive input terminal of described amplifier U1 is also connected with the capacitor C 2 of ground connection.
3. the photosensitive circuit detecting for photosensor signal according to claim 1, is characterized in that: the negative input end of described amplifier U1 is also connected with the capacitor C 3 of ground connection.
4. the photosensitive circuit detecting for photosensor signal according to claim 1, is characterized in that: described resistance R 4 and resistance R 5 resistances equate.
5. the photosensitive circuit detecting for photosensor signal according to claim 1, is characterized in that: described amplifier is selected LM324 type amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320820122.6U CN203745082U (en) | 2013-12-14 | 2013-12-14 | Photosensitive circuit for detecting photosensitive signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320820122.6U CN203745082U (en) | 2013-12-14 | 2013-12-14 | Photosensitive circuit for detecting photosensitive signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745082U true CN203745082U (en) | 2014-07-30 |
Family
ID=51344869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320820122.6U Withdrawn - After Issue CN203745082U (en) | 2013-12-14 | 2013-12-14 | Photosensitive circuit for detecting photosensitive signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203745082U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674241A (en) * | 2013-12-14 | 2014-03-26 | 成都国蓉科技有限公司 | Photosensitive circuit for detecting photosensitive signal |
| CN105675033A (en) * | 2016-02-29 | 2016-06-15 | 江西通用光电应用技术研究所有限责任公司 | Identification apparatus for digital display type instrument dial plate |
-
2013
- 2013-12-14 CN CN201320820122.6U patent/CN203745082U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674241A (en) * | 2013-12-14 | 2014-03-26 | 成都国蓉科技有限公司 | Photosensitive circuit for detecting photosensitive signal |
| CN105675033A (en) * | 2016-02-29 | 2016-06-15 | 江西通用光电应用技术研究所有限责任公司 | Identification apparatus for digital display type instrument dial plate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20150826 |
|
| RGAV | Abandon patent right to avoid regrant |