CN203522686U - Photoconductive switch circuit - Google Patents
Photoconductive switch circuit Download PDFInfo
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- CN203522686U CN203522686U CN201320654581.1U CN201320654581U CN203522686U CN 203522686 U CN203522686 U CN 203522686U CN 201320654581 U CN201320654581 U CN 201320654581U CN 203522686 U CN203522686 U CN 203522686U
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- resistance
- resistor
- phototriode
- amplifier
- switch circuit
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Abstract
The utility model discloses a photoconductive switch circuit which comprises a photosensitive triode, an amplifier, a resistor, R1, a resistor R2, a resistor R3 and a resistor R4. Two ends of the resistor R1 are respectively connected with the base electrode and the collector of the photosensitive triode. The collector of the photosensitive triode is connected with a power supply and the emitter of the photosensitive triode is connected with the ground through the resistor R2. The resistor R3 and the resistor R4 are in series connection, then a common end is grounded, and the other common end is connected to the collector of the photosensitive triode. An input end of the amplifier is connected to the emitter of the photosensitive triode, and the other input end of the amplifier is connected between the resistor R3 and the resistor R4. The photoconductive switch circuit has the advantages of high control sensitivity, a simple circuit and the facilitation of miniaturized integration.
Description
Technical field
The utility model relates to a kind of circuit structure, relates in particular a kind of photoconductive switch circuit.
Background technology
Photoconductive switch is a kind of semiconductor photoelectronic device developing rapidly in recent ten years.Its operation principle is the resistivity that adopts the photoelectric effect modulation material of semi-conducting material, be that irradiation is on semi-conducting material, Electron absorption photon energy in valence band in material, by forbidden band, leap to conduction band, hole in the interior electron concentration of conduction band and valence band is increased, inspire light induced electron-hole pair, make semi-conducting material produce photoelectric effect.Nowadays, more and more to the utilization of photoconductive switch, the switching circuit of the characteristic research and development that utilize photoconductive switch of each aspect, field is more and more.But it mostly consists of more electronic devices and components, circuit is more complicated, is not suitable for the integrated demand of minitype circuit board.
Utility model content
The utility model provides a kind of photoconductive switch circuit, and its control is highly sensitive, and circuit is simple, is convenient to miniaturization integrated.
For solving above-mentioned technical problem, the utility model by the following technical solutions:
Photoconductive switch circuit, it comprises phototriode, amplifier, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, the two ends of described resistance R 1 are connected in the base stage and collector electrode of phototriode, the collector electrode of described phototriode is connected with power supply and emitter is connected to the ground by resistance R 2, described resistance R 3 connect with resistance R 4 after a common end grounding, another common port is connected on the collector electrode of phototriode, an input of described amplifier is connected on the emitter of phototriode, another input is connected between resistance R 3 and resistance R 4.In the utility model, adopt phototriode to make photoinduction device, it because it has different spectral characteristics, has very large electric current amplification than photodiode, has higher sensitivity.Circuit structure of the present utility model is simple, only utilizes phototriode, amplifier and resistance to form, simple in structure, is convenient to miniaturization integrated.When illumination acts on phototriode, illumination makes phototriode V
bEreduce, phototriode conducting, amplifier amplifies two voltage signal differences of input, and the analog signal of amplifier output can characterize the intensity of illumination.Resistance R 2 plays current limliting, and resistance R 3 and resistance R 4 play dividing potential drop.
Further technical scheme is:
As preferably, the ratio of described resistance R 3 and the resistance of resistance R 4 is 1:3.Resistance R 3 and resistance R 4 play dividing potential drop, and amplifier is shielded.
Further, the output of described amplifier is connected on A/D converter.A/D converter can transform the analog signal of amplifier output, is converted into digital signal, is convenient to control appliance data are processed.
As preferably, described resistance R 2 and the resistance of resistance R 4 equate.
Compared with prior art, the beneficial effects of the utility model are: control of the present utility model is highly sensitive, and it is few that circuit comprises electronic devices and components, simple in structure, is convenient to miniaturization integrated.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Execution mode of the present utility model includes but not limited to the following example.
[embodiment]
Photoconductive switch circuit as shown in Figure 1, it comprises phototriode, amplifier, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, the two ends of described resistance R 1 are connected in the base stage and collector electrode of phototriode, the collector electrode of described phototriode is connected with power supply and emitter is connected to the ground by resistance R 2, described resistance R 3 connect with resistance R 4 after a common end grounding, another common port is connected on the collector electrode of phototriode, an input of described amplifier is connected on the emitter of phototriode, another input is connected between resistance R 3 and resistance R 4.
The ratio of described resistance R 3 and the resistance of resistance R 4 is 1:3.
The output of described amplifier is connected on A/D converter.
Described resistance R 2 and the resistance of resistance R 4 equate.
The operation principle of the present embodiment is as follows:
When illumination acts on phototriode, illumination makes phototriode V
bEreduce, phototriode conducting, amplifier amplifies two voltage signal differences of input, and the analog signal of amplifier output can characterize the intensity of illumination.A/D converter transforms the analog signal of amplifier output, is translated into digital signal, is convenient to control appliance data are processed.In circuit, resistance R 2 plays current limliting, and resistance R 3 and resistance R 4 play dividing potential drop.
According to the above embodiments, can well complete the utility model.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned execution mode, 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 range of the present utility model.
Claims (4)
1. photoconductive switch circuit, it is characterized in that: it comprises phototriode, amplifier, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, the two ends of described resistance R 1 are connected in the base stage and collector electrode of phototriode, the collector electrode of described phototriode is connected with power supply and emitter is connected to the ground by resistance R 2, described resistance R 3 connect with resistance R 4 after a common end grounding, another common port is connected on the collector electrode of phototriode, an input of described amplifier is connected on the emitter of phototriode, another input is connected between resistance R 3 and resistance R 4.
2. photoconductive switch circuit according to claim 1, is characterized in that: the ratio of described resistance R 3 and the resistance of resistance R 4 is 1:3.
3. photoconductive switch circuit according to claim 1 and 2, is characterized in that: the output of described amplifier is connected on A/D converter.
4. photoconductive switch circuit according to claim 1, is characterized in that: described resistance R 2 and the resistance of resistance R 4 equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320654581.1U CN203522686U (en) | 2013-10-23 | 2013-10-23 | Photoconductive switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320654581.1U CN203522686U (en) | 2013-10-23 | 2013-10-23 | Photoconductive switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203522686U true CN203522686U (en) | 2014-04-02 |
Family
ID=50381556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320654581.1U Expired - Fee Related CN203522686U (en) | 2013-10-23 | 2013-10-23 | Photoconductive switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203522686U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532535A (en) * | 2013-10-23 | 2014-01-22 | 成都市宏山科技有限公司 | Simple light guide switching circuit |
-
2013
- 2013-10-23 CN CN201320654581.1U patent/CN203522686U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532535A (en) * | 2013-10-23 | 2014-01-22 | 成都市宏山科技有限公司 | Simple light guide switching circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20141023 |
|
| EXPY | Termination of patent right or utility model |