CN204228266U - Photoelectric tube signal deteching circuit and the monitoring device comprising this circuit - Google Patents
Photoelectric tube signal deteching circuit and the monitoring device comprising this circuit Download PDFInfo
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- CN204228266U CN204228266U CN201420567967.3U CN201420567967U CN204228266U CN 204228266 U CN204228266 U CN 204228266U CN 201420567967 U CN201420567967 U CN 201420567967U CN 204228266 U CN204228266 U CN 204228266U
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- photoelectric tube
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- signal deteching
- deteching circuit
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Abstract
The utility model relates to signal processing technology, particularly a kind of signal deteching circuit for photoelectric tube and comprise the monitoring device of this circuit.Comprise according to the photoelectric tube signal deteching circuit of the utility model embodiment: resistor, it is coupled in series between the drive end for driving the DC driver of photoelectric tube and described photoelectric tube; The first transistor, its base stage and emitter are coupling in the two ends of described resistor respectively; And transistor seconds, the collector coupled of its base stage and described the first transistor, grounded emitter and collector are coupled with the output terminal of described photoelectric tube signal deteching circuit, wherein, when described DC driver work, if the photocurrent of described photoelectric tube increases, then described in the voltage official post of described resistor two ends periodicity generation, the first transistor periodically enters conducting state, and then make described transistor seconds periodically enter conducting state, output pulse signal on described output terminal thus.
Description
Technical field
The utility model relates to signal processing technology, particularly a kind of signal deteching circuit for photoelectric tube and comprise the monitoring device of this circuit.
Background technology
Photoelectric tube is a kind of electrooptical device, is provided with negative electrode and anode in pipe, and wherein negative electrode light will discharge photoelectron after irradiating, under the effect of electric field, form the photocurrent corresponding with intensity of illumination.Owing to having the features such as high sensitivity, high response speed and low noise, therefore photoelectric tube is a kind of sensor be widely used.
Flame radiation comprises the gas radiation of discrete spectrum and the solid radiative of adjoint continuous spectrum.For avoiding the interference of other signal, the detection of flame often utilizes wavelength to be less than the ultraviolet of 300 nanometers as detectable signal.Only the ultraviolet in 185 ~ 260 nanometer range is responded based on the ultraviolet phototube of photovoltaic principals or sensor, and insensitive to the light of other frequency spectrum.Particularly, the wavelength arriving the sunshine on ground is greater than 300 nanometers, therefore 220 ~ 280 wave bands of flame detecting belong to solar spectrum blind area, this successfully avoids the complex background that the most powerful lamp causes, and therefore ultraviolet phototube is very suitable for the detection of flame.
But in the prior art, complicated for the circuit structure detecting photoelectric tube transducing signal, high to the reliability requirement of components and parts, this makes overall system cost be difficult to reduce, and too increases the difficulty of maintenance.
Utility model content
The purpose of this utility model is to provide a kind of photoelectric tube signal deteching circuit, and it has the simple and high reliability of structure.
Comprise according to the photoelectric tube signal deteching circuit of the utility model embodiment:
Resistor, it is coupled in series between the drive end for driving the DC driver of photoelectric tube and described photoelectric tube;
The first transistor, its base stage and emitter are coupling in the two ends of described resistor respectively; And
Transistor seconds, the collector coupled of its base stage and described the first transistor, grounded emitter and collector are coupled with the output terminal of described photoelectric tube signal deteching circuit,
Wherein, when described DC driver work, if the photocurrent of described photoelectric tube increases, then described in the voltage official post of described resistor two ends periodicity generation, the first transistor periodically enters conducting state, and then make described transistor seconds periodically enter conducting state, output pulse signal on described output terminal thus.
In the above-described embodiments, resistor is adopted to detect the photocurrent of photoelectric tube as sensing element, and adopt simple double transistor structure to realize the conversion of resistor both end voltage difference to pulse signal, this is conducive to the reliability of raising circuit and reduces manufacture and maintenance cost.Moreover the employing of transistor can realize response speed faster.Finally, the circuit output form of pulse signal is very suitable for the data processing of computing equipment.
Preferably, in above-mentioned photoelectric tube signal deteching circuit, described the first transistor and transistor seconds are respectively positive-negative-positive bipolar transistor and npn type bipolar transistor.
Preferably, in above-mentioned photoelectric tube signal deteching circuit, described resistor two ends also and connect filter capacitor.
Preferably, in above-mentioned photoelectric tube signal deteching circuit, the base stage of described transistor seconds be connected in series RC filtering circuit between emitter.
Of the present utility model also have an object to be to provide a kind of monitoring device, and it has the simple and high reliability of structure.
Comprise according to the monitoring device of the utility model embodiment:
Photoelectric tube;
DC driver;
Microcontroller;
Photoelectric tube signal deteching circuit, it comprises:
Resistor, it is coupled in series between the drive end of described DC driver and described photoelectric tube;
The first transistor, its base stage and emitter are coupling in the two ends of described resistor respectively; And
Transistor seconds, the collector coupled of its base stage and described the first transistor, grounded emitter and collector are coupled with described microcontroller through the output terminal of described photoelectric tube signal deteching circuit,
Wherein, when described DC driver work, if the photocurrent of described photoelectric tube increases, then described in the voltage official post of described resistor two ends periodicity generation, the first transistor periodically enters conducting state, and then make described transistor seconds periodically enter conducting state, output pulse signal on described output terminal thus.
Preferably, in above-mentioned monitoring device, described photoelectric tube is ultraviolet phototube.
Accompanying drawing explanation
Description by the various aspects below in conjunction with accompanying drawing is become more clear and is easier to understand by above-mentioned and/or other side of the present utility model and advantage, and in accompanying drawing, same or analogous unit adopts identical label to represent, accompanying drawing comprises:
Fig. 1 is the circuit theory diagrams of the photoelectric tube signal deteching circuit according to the utility model embodiment.
Fig. 2 is the block diagram of the monitoring device according to another embodiment of the utility model.
Reference list
10 monitoring devices
110 photoelectric tube signal deteching circuits
111 first modules
112 second units
R1, R2, R3, R4, R5, R6, R7, R8 resistor
C1, C2, C3, C4 capacitor
Q1 the first transistor
Q2 transistor seconds
DC constant pressure source
The output terminal of OUT photoelectric tube signal deteching circuit
The output terminal of DCPS DC driver
The drive end of DRV photoelectric tube
120 DC drivers
130 photoelectric tubes
140 microcontrollers
Embodiment
More all sidedly the utility model is described referring to the accompanying drawing which illustrates the utility model illustrative examples.But the utility model can realize by multi-form, and should not be read as each embodiment being only limitted to provide herein.The various embodiments described above provided are intended to make disclosure herein comprehensively complete, thus make the understanding of the utility model protection domain more comprehensive and accurate.
Such as " comprise " and the term of " comprising " and so on represents except having the unit and step that have in the specification and in the claims directly and clearly state, the technical solution of the utility model does not get rid of the situation had not by other unit of directly or clearly stating and step yet.
The such as term of " first " and " second " and so on does not represent the order of unit in time, space, size etc. and is only be used as to distinguish each unit.
Embodiment of the present utility model is specifically described below by accompanying drawing.
Fig. 1 is the circuit theory diagrams of the photoelectric tube signal deteching circuit according to the utility model embodiment.
The first module 111 outputed signal for sensor light fulgurite and the second unit 112 generating trigger pip in response to the appearance of photoelectric tube output signal is comprised according to the photoelectric tube signal deteching circuit 110 of the present embodiment.Exemplarily, the present embodiment hypothesis photoelectric tube is ultraviolet phototube.
First module 111 adopts resistor R1 as sensing element, and as shown in Figure 1, the first end of resistor R1 is connected to the drive end DRV of photoelectric tube through resistor R3 and R4, the second end is connected with the output terminal DCPS of DC driver through resistor R2.In order to eliminate or suppress interference, at the two ends of resistor R1 also and meet filter capacitor C1 and C2, and be also connected filter capacitor C3 between drive end DRV with ground connection GND.
Second unit 112 mainly comprises the first transistor Q1 and transistor seconds Q2.In the present embodiment, preferably, the first transistor Q1 and transistor seconds Q2 is respectively positive-negative-positive bipolar transistor and npn type bipolar transistor.As shown in Figure 1, the base stage of the first transistor Q1 is connected with the second end with the first end of resistor R1 respectively with emitter, its collector is connected to the base stage of transistor seconds Q2 through resistor R5 and R6, the grounded emitter of transistor seconds Q2, collector to be connected with constant pressure source DC through resistor R8 and to be connected with the signal input tube pin of microcontroller as output terminal OUT.In addition, transistor seconds Q2 base stage be connected in series the RC filtering circuit be made up of resistor R7 and capacitor C4 between emitter.
The principle of work of the signal deteching circuit of photoelectric tube shown in Fig. 1 is below described.
In the present embodiment, DC driver output voltage amplitude is 300 volts and frequency is the DC pulse signal of 50Hz.When not forming photocurrent in photoelectric tube, drive end DRV is in open-circuit condition, and resistor R1 does not have DC pulse signal to pass through, and its two ends do not exist voltage difference, therefore the first transistor Q1 and transistor seconds Q2 is all in cut-off state, and output terminal OUT is in low level state.
When on Ultraviolet radiation to photoelectric tube, photocurrent will be formed in photoelectric tube, now at DC driver, form current return between resistor R2, R1, R3 and R4 and photoelectric tube, thus periodically will produce voltage difference at resistor R1 two ends.When resistor R1 two ends coating-forming voltage difference, the first transistor Q1 will change conducting state into by cut-off state, and then make transistor seconds Q2 change conducting state into by cut-off state, therefore make output terminal OUT be in high level state.Because resistor R1 two ends periodically produce voltage difference, on output terminal OUT, export a series of pulse signal detects ultraviolet signal state with pilot light fulgurite thus.
Fig. 2 is the block diagram of the monitoring device according to another embodiment of the utility model.
As shown in Figure 2, the monitoring device 10 of the present embodiment comprises photoelectric tube signal deteching circuit 110, DC driver 120, photoelectric tube 130 and microcontroller 140.
In the present embodiment, DC driver 120 is coupled with photoelectric tube 130 and provides DC pulse drive singal with latter.When not forming photocurrent in photoelectric tube 130, DC driver 120 is in off-state with the loop at photoelectric tube 130 place; Otherwise when forming photocurrent in photoelectric tube 130, DC driver 120 is in conducting state with the loop at photoelectric tube 130 place, and therefore the on off operating mode in this loop can reflect whether photoelectric tube 130 detects light signal.
By being coupled in by sensing element between DC driver 120 and photoelectric tube 130, photoelectric tube signal deteching circuit 110 can detect the on off operating mode in DC driver 120 and the loop at photoelectric tube 130 place and produce corresponding indicator signal.On the other hand, as shown in Figure 2, photoelectric tube signal deteching circuit 110 and microcontroller 140 are coupled to export corresponding indicator signal.Preferably, by the circuit structure described in Fig. 1 and principle of work above the photoelectric tube signal deteching circuit 110 in the present embodiment can adopt.Particularly, the resistor R1 in this photoelectric tube signal deteching circuit 110 can be coupled between DC driver 120 and photoelectric tube 130.
Although represented and discussed aspects more of the present utility model, but those skilled in the art it is appreciated that and can change in above-mentioned under the condition not deviating from the utility model principle and spirit, and therefore scope of the present utility model limited by claim and equivalent content.
Claims (9)
1. a photoelectric tube signal deteching circuit, is characterized in that, comprising:
Resistor, it is coupled in series between the drive end for driving the DC driver of photoelectric tube and described photoelectric tube;
The first transistor, its base stage and emitter are coupling in the two ends of described resistor respectively; And
Transistor seconds, the collector coupled of its base stage and described the first transistor, grounded emitter and collector are coupled with the output terminal of described photoelectric tube signal deteching circuit,
Wherein, when described DC driver work, if the photocurrent of described photoelectric tube increases, then described in the voltage official post of described resistor two ends periodicity generation, the first transistor periodically enters conducting state, and then make described transistor seconds periodically enter conducting state, output pulse signal on described output terminal thus.
2. photoelectric tube signal deteching circuit as claimed in claim 1, wherein, described the first transistor and transistor seconds are respectively positive-negative-positive bipolar transistor and npn type bipolar transistor.
3. photoelectric tube signal deteching circuit as claimed in claim 1, wherein, described resistor two ends also and connect filter capacitor.
4. the photoelectric tube signal deteching circuit as described in claim arbitrary in claim 1-3, wherein, the base stage of described transistor seconds be connected in series RC filtering circuit between emitter.
5. a monitoring device, is characterized in that, comprises:
Photoelectric tube;
DC driver;
Microcontroller;
Photoelectric tube signal deteching circuit, it comprises:
Resistor, it is coupled in series between the drive end of described DC driver and described photoelectric tube;
The first transistor, its base stage and emitter are coupling in the two ends of described resistor respectively;
And
Transistor seconds, the collector coupled of its base stage and described the first transistor, grounded emitter and collector are coupled with described microcontroller through the output terminal of described photoelectric tube signal deteching circuit,
Wherein, when described DC driver work, if the photocurrent of described photoelectric tube increases, then described in the voltage official post of described resistor two ends periodicity generation, the first transistor periodically enters conducting state, and then make described transistor seconds periodically enter conducting state, output pulse signal on described output terminal thus.
6. monitoring device as claimed in claim 5, wherein, described the first transistor and transistor seconds are respectively positive-negative-positive bipolar transistor and npn type bipolar transistor.
7. monitoring device as claimed in claim 5, wherein, described resistor two ends also and connect filter capacitor.
8. monitoring device as claimed in claim 5, wherein, the base stage of described transistor seconds be connected in series RC filtering circuit between emitter.
9. the monitoring device as described in claim arbitrary in claim 5-8, wherein, described photoelectric tube is ultraviolet phototube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420567967.3U CN204228266U (en) | 2014-09-29 | 2014-09-29 | Photoelectric tube signal deteching circuit and the monitoring device comprising this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420567967.3U CN204228266U (en) | 2014-09-29 | 2014-09-29 | Photoelectric tube signal deteching circuit and the monitoring device comprising this circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204228266U true CN204228266U (en) | 2015-03-25 |
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| CN201420567967.3U Active CN204228266U (en) | 2014-09-29 | 2014-09-29 | Photoelectric tube signal deteching circuit and the monitoring device comprising this circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959384A (en) * | 2017-04-19 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of photoelectric detective circuit, display panel and display device |
-
2014
- 2014-09-29 CN CN201420567967.3U patent/CN204228266U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959384A (en) * | 2017-04-19 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of photoelectric detective circuit, display panel and display device |
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