CN202119541U - Pyroelectric flame sensor - Google Patents
Pyroelectric flame sensor Download PDFInfo
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- CN202119541U CN202119541U CN2011202031985U CN201120203198U CN202119541U CN 202119541 U CN202119541 U CN 202119541U CN 2011202031985 U CN2011202031985 U CN 2011202031985U CN 201120203198 U CN201120203198 U CN 201120203198U CN 202119541 U CN202119541 U CN 202119541U
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- responsive
- flame sensor
- layer double
- tuple
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Abstract
The utility model discloses a pyroelectric flame sensor, which comprises a tube base, a base pin and a single-layer double-sided circuit board. A field-effect tube is connected to one side of the single-layer double-sided circuit board in a bonding mode by adopting automatic surface mount technology, and a sensing element is connected to the other side of the single-layer double-sided circuit board in a bonding mode by adopting the automatic surface mount technology. A protruding support portion is arranged at the position where the single-layer double-sided circuit board is connected with the sensing element, and the field-effect tube is contacted with the tube base and penetrates through the tube base to be connected with the base pin. By means of the single-layer double-sided circuit board structure, preparation of the pyrolelectirc flame sensor with two channels is achieved by adopting a surface mounting element without increasing volume of the sensor and reducing volume of the field-effect tube. The single-layer double-sided circuit board is respectively connected with the field-effect tube and the sensing element in the bonding mode by adopting the automatic surface mount technology, the automatic surface mount can enable volume of a electronic product to be reduced by 40% to 60% and weight of the electronic product to be reduced by 60% to 80%, thereby enabling the sensor to meet requirements of miniaturization.
Description
Technical field
The utility model relates to the flame sensor field, more particularly, relates to a kind of pyroelectricity flame sensor.
Background technology
The effect of flame sensor is to be used for flame detecting, and in the prior art, flame sensor commonly used includes the pyroelectric lithium tantalite flame sensor.
The flame detector principle of pyroelectric lithium tantalite material: when some crystal are heated, can produce quantity at the crystal two ends and equate and the electric charge of opposite in sign that this electric polarization phenomenon that produces owing to thermal distortion is called pyroelectric effect.Its detection principle is based on blackbody radiation law; When the infrared ray illumination sensor; Its internal polarization effect changes a lot; Its variation part discharges as electric charge, extracts the output voltage that this electric charge just becomes sensor from the outside, and pyroelectric sensor only just has output voltage when temperature variation.
Binary channels pyroelectric sensor in the market; Domesticly generally adopt packaged field-effect tube, though cost is lower, because the FET volume that encapsulated is big; The binary channels pyroelectric sensor volume that causes making increases, and has limited the usable range of sensor itself.Be exactly in addition in the market product be unit single channel pyroelectricity flame detector mostly, single-sensor uses anti-extraneous optics interference performance poor.
In sum, how providing a kind of new type double passage heat that takes up room little to release flame sensor is present those skilled in the art's problem demanding prompt solution.
The utility model content
In view of this, the utility model provides a kind of pyroelectricity flame sensor, to realize reducing the purpose that sensor takes up room.
The utility model is achieved in that
A kind of pyroelectricity flame sensor is characterized in that, comprising:
Base, pin and individual layer double-sided PCB;
The one side of said individual layer double-sided PCB adopts automatic chip mounting technology to be sticked and is connected with FET, and another side adopts automatic chip mounting technology to be sticked and is connected with responsive unit;
The link position of said individual layer double-sided PCB and said responsive unit is provided with the support portion of protrusion;
Said FET realizes that through circuit electricity is connected with said individual layer double-sided PCB.
Preferably, in the utility model embodiment, said individual layer double-sided PCB comprises metering circuit and reference circuit;
Said metering circuit comprises first FET, the first responsive tuple, the first impedance conversion resistance and the first test number of the winning the confidence resistance;
After the said first responsive tuple and the first impedance conversion resistance parallel connection, an end is connected with first fet gate, and the other end connects as earth terminal ground connection; One end of the said first test number of the winning the confidence resistance is connected with the source class of said first FET, and the other end is connected with said earth terminal;
Said reference circuit comprises second FET, the second responsive tuple, the second impedance conversion resistance and the second test number of the winning the confidence resistance;
After the said second responsive tuple and the second impedance conversion resistance parallel connection, an end is connected with second fet gate, and the other end connects as earth terminal ground connection; One end of the said second test number of the winning the confidence resistance is connected with the source class of said second FET, and the other end is connected with said earth terminal;
After being connected, the drain electrode of the drain electrode of said first FET and second FET connects power supply.
Preferably, in the utility model embodiment, the said first responsive tuple and the said second responsive tuple comprise two responsive units respectively.
Preferably, in the utility model embodiment, said FET closely contacts with said base.
Preferably, in the utility model embodiment, said impedance conversion resistance is located at one side relative with said FET in the said individual layer double-sided PCB.
Preferably, in the utility model embodiment, said base is fixedly connected with pipe cap;
Said pipe cap is provided with cavity; Said pipe cap is with after said base is connected, and said FET, individual layer double-sided PCB, responsive unit and impedance conversion resistance are positioned at said cavity.
Preferably, in the utility model embodiment, the electrode in the responsive unit in the said responsive tuple adopts binding power traction Wiring technology to be connected with the grid lead wire of said FET.
Preferably, in the utility model embodiment, said responsive unit is the responsive unit of lithium tantalate.
Preferably, in the utility model embodiment, said pipe cap is provided with respectively and said first responsive unit and corresponding first optical filter and second optical filter in second responsive first position, and said first optical filter and second optical filter have the different working bands of a spectrum respectively.
Preferably, in the utility model embodiment, said support portion is a ferrite.
In sum; Among the utility model embodiment; Be made as the individual layer double-sided PCB through circuit board, adopt automatic chip mounting technology that circuit board is connected with responsive unit with FET then, thereby reduced the volume of flame sensor effectively the pyroelectricity flame sensor; In addition; Because in the utility model embodiment, also be provided with the support portion of protrusion, the position of having raised responsive unit through the support portion at the individual layer double-sided PCB and the link position of responsive unit; Thereby enlarged the visual angle of sensor, and then improved the detection performance of sensor.
Description of drawings
The base synoptic diagram that Fig. 1 provides for the utility model embodiment;
The one-piece construction synoptic diagram that Fig. 2 provides for the utility model embodiment;
The circuit diagram that Fig. 3 provides for the utility model embodiment;
The another synoptic diagram of base that Fig. 4 provides for the utility model embodiment.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
In order to reduce the volume of pyroelectricity flame sensor effectively, present embodiment discloses a kind of pyroelectricity flame sensor.With reference to figure 1 and Fig. 2, the pyroelectricity flame sensor comprises: base 1, pin two and individual layer double-sided PCB 4;
The one side of individual layer double-sided PCB 4 adopts automatic chip mounting technology to be sticked and is connected with FET 3, and another side adopts automatic chip mounting technology to be sticked and is connected with responsive tuple 5;
The link position of individual layer double-sided PCB 4 and responsive tuple 5 is provided with the support portion of protrusion;
FET 3 contacts the effect of playing support with base 1, and is connected with pin two with base 1 through the electricity connection of circuit board.
Concrete, the utility model adopts the double-sided PCB 4 of individual layer, the individual layer double-sided PCB 4 one sides FET 3 that has been sticked; Individual layer double-sided PCB 4 is fixedly connected with base 1, and FET 3 is located between individual layer double-sided PCB 4 and the base 1; Base 1 is fixedly connected with pin two, and FET is connected with the pin two circuit through base 1.
The another side of individual layer double-sided PCB 4 posts responsive tuple 5 and impedance conversion resistance 9, and responsive tuple 5 is attached to above the support portion of single layer board 4;
Responsive tuple 5 is connected with FET 3 circuit through the P.e.c. in the circuit board, and individual layer double-sided PCB 4 is provided with the P.e.c. that is used to connect responsive tuple 5 and FET 3.
SMT (Surface Mounted Technology) automatic chip mounting technology is a kind of technology and the technology in the electronics assembling industry, and the high advantage of packing density is arranged.Chip components and parts greatly reduce than traditional element area occupied and quality.Usually, adopt after the SMT automatic chip mounting technology electronic product volume-diminished 40%-60%, weight saving 60%-80%.
Because in the prior art, the FET volume that encapsulate is big, thereby makes that the volume of sensor also can be bigger, so limited need sensor at application scenarios volume than hour application of sensor.The utility model adopts SMT automatic chip mounting technology, and through the structure of single layer board, under the prerequisite that does not reduce the FET volume, the volume of the feasible pyroelectricity flame sensor of processing is reduced effectively, and then has realized the purpose of sensor miniaturization.
Further, with reference to figure 3, in the utility model embodiment, the individual layer double-sided PCB can comprise metering circuit 50 and reference circuit 60;
After being connected, the drain electrode of the drain electrode of first FET 51 and second FET 61 connects power supply.
The utility model can be double base binary channels pyroelectricity flame sensor; Promptly two responsive tuples have included two responsive units; After constituting a passage respectively, two responsive tuples and two FETs form binary channels; For this reason, it is two also that pipe cap is provided with the detection window corresponding with responsive first position, and each detection window is provided with optical filter.
In the utility model embodiment, also include pipe cap 7, pipe cap 7 is provided with cavity, and the cavity edge of pipe cap 7 is fixedly connected with base 1, and FET 3, individual layer double-sided PCB 4, responsive tuple 5 and impedance conversion resistance 9 are positioned at cavity;
Pipe cap 7 is provided with the optical filter 6 corresponding with responsive tuple 5.Double-field effect pipe 3 closely contacts with base 1 with individual layer double-sided PCB 4 respectively; Because the two point supporting role of double-field effect pipe 3; Guarantee the level of individual layer double-sided PCB 4, guaranteed the visual angle consistance of two responsive tuples 5, the position of having raised responsive tuple 5 simultaneously; Enlarge the visual angle of sensor, improved the detection performance of sensor.
Among the utility model embodiment; The concrete course of work of double base binary channels pyroelectricity flame sensor is; The light of flame is through the optical filter 6 on the pipe cap 7; Two responsive tuples 5 in optical filter 6 back receive light, and two impedance resistance convert light signal to electric signal, judge the situation of flame according to the size of voltage.In the utility model embodiment, each responsive tuple can be made up of two responsive units, thereby can play the effect of temperature compensation.
In the utility model embodiment, binary channels pyroelectricity flame sensor includes two passages, for this reason, needs four pins, and concrete, each pin can be as shown in Figure 4 in the position of base 1, and base 1 is provided with the connecting hole of pin two; Wherein connecting hole 11 can be connected with reference circuit 60 circuit with metering circuit 50 respectively with 12, and in addition, connecting hole 13 is connected with the ground pin circuit with power pin respectively with 14.
Compare through metering circuit 50 and reference circuit 60 two paths of signals, can distinguish breaking out of fire or have the interference emission source.When the signal amplitude V1 of detection channels when keeping watch on the signal amplitude V2 of passage, generate fire alarm signal; As the signal amplitude V2 that keeps watch on passage during greater than the signal amplitude V2 of detection channels, explain to have external interference emission, do not report to the police at this moment.
Concrete, in practical application, can be provided with on the pipe cap 7 respectively and the said first responsive tuple 52 and corresponding first optical filter and second optical filter in the second first 62 groups of positions of sensitivity; First optical filter and second optical filter have the different working bands of a spectrum respectively; Because first optical filter and second optical filter have the different working bands of a spectrum respectively, so detection channels has also just had the different working frequency band with the supervision passage; Concrete; Can be, the work bands of a spectrum of detection channels can be 4.1-4.7 μ m, and the work bands of a spectrum of keeping watch on passage can be for about 5-6 μ m or 3.8 μ m.
Because responsive unit becomes the compensation of double base reverse parallel connection by the unit is uncompensated among the utility model embodiment, thereby the destruction of having avoided the temperature acute variation to cause responsive first material property.
In the utility model embodiment, the support portion can be ferrite; Thereby make the support portion in the effect of playing support, can also play the effect that circuit connects, and, because ferrite has resistant to elevated temperatures characteristic, thereby can satisfy the requirement of needs high temperature sintering in the manufacture craft.
In addition, in this embodiment, the responsive unit in the responsive tuple 5 can process for the lithium tantalate material.Present embodiment does not limit and must adopt the responsive unit of lithium tantalate, can adopt the responsive unit of other materials equally, for example lead zirconate titanate (PZT) type responsive unit.
Further, the utility model can use to be bound the power traction Wiring technology and realizes drawing of signal, concrete, can be in the responsive tuple 5 responsive unit on electrode adopt binding power traction Wiring technology to be connected with the grid lead wire of said FET 3.
Said binding machine refers to the technology based on the lead-in wire bonding; The technology that technology wiring welding zone on semi-conductor chip welding zone and the substrate is coupled together with filament; Its principle is to adopt heating, pressurization and mode such as ultrasonic to destroy the oxide layer that is soldered the surface to produce plastic yield; Make lead-in wire be soldered the surface and intimate contact, find interatomic gravisphere and cause atom diffusion between the interface and form pad.The utility model is realized drawing of signal through binding the power traction line; Compare with other encapsulation technology; Bind the power traction Wiring technology and have that technical price is cheap, the advantage of conserve space, technical maturity, adopt and bind the power traction Wiring technology and can improve the production efficiency and the homogeneity of product of enterprise.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. a pyroelectricity flame sensor is characterized in that, comprising:
Base, pin and individual layer double-sided PCB;
The one side of said individual layer double-sided PCB adopts automatic chip mounting technology to be sticked and is connected with FET, and another side adopts automatic chip mounting technology to be sticked and is connected with responsive unit;
The link position of said individual layer double-sided PCB and said responsive unit is provided with the support portion of protrusion;
Said FET realizes that through circuit electricity is connected with said individual layer double-sided PCB.
2. flame sensor according to claim 1 is characterized in that:
Said individual layer double-sided PCB comprises metering circuit and reference circuit;
Said metering circuit comprises first FET, the first responsive tuple, the first impedance conversion resistance and the first test number of the winning the confidence resistance;
After the said first responsive tuple and the first impedance conversion resistance parallel connection, an end is connected with first fet gate, and the other end connects as earth terminal ground connection; One end of the said first test number of the winning the confidence resistance is connected with the source class of said first FET, and the other end is connected with said earth terminal;
Said reference circuit comprises second FET, the second responsive tuple, the second impedance conversion resistance and the second test number of the winning the confidence resistance;
After the said second responsive tuple and the second impedance conversion resistance parallel connection, an end is connected with second fet gate, and the other end connects as earth terminal ground connection; One end of the said second test number of the winning the confidence resistance is connected with the source class of said second FET, and the other end is connected with said earth terminal;
After being connected, the drain electrode of the drain electrode of said first FET and second FET connects power supply.
3. flame sensor according to claim 1 is characterized in that:
The said first responsive unit combination second responsive tuple comprises two responsive units respectively.
4. flame sensor according to claim 1 is characterized in that:
Said FET closely contacts with said base.
5. flame sensor according to claim 1 is characterized in that:
Said impedance conversion resistance is located at one side relative with said FET in the said individual layer double-sided PCB.
6. flame sensor according to claim 1 is characterized in that: said base is fixedly connected with pipe cap;
Said pipe cap is provided with cavity; Said pipe cap is with after said base is connected, and said FET, individual layer double-sided PCB, responsive unit and impedance conversion resistance are positioned at said cavity.
7. flame sensor according to claim 3 is characterized in that:
Electrode in the responsive unit in the said responsive tuple adopts binding power traction Wiring technology to be connected with the grid lead wire of said FET.
8. flame sensor according to claim 1 is characterized in that, said responsive unit is the responsive unit of lithium tantalate.
9. flame sensor according to claim 2 is characterized in that:
Said pipe cap is provided with respectively and said first responsive unit and corresponding first optical filter and second optical filter in second responsive first position, and said first optical filter and second optical filter have the different working bands of a spectrum respectively.
10. according to the said flame sensor of claim 1, it is characterized in that: said support portion is a ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202031985U CN202119541U (en) | 2011-06-15 | 2011-06-15 | Pyroelectric flame sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202031985U CN202119541U (en) | 2011-06-15 | 2011-06-15 | Pyroelectric flame sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202119541U true CN202119541U (en) | 2012-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202031985U Expired - Lifetime CN202119541U (en) | 2011-06-15 | 2011-06-15 | Pyroelectric flame sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202119541U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458007A (en) * | 2014-12-12 | 2015-03-25 | 电子科技大学 | Pyroelectric infrared detector |
| CN112714005A (en) * | 2021-01-26 | 2021-04-27 | 深圳市玩视科技有限公司 | PD module and power supply system |
-
2011
- 2011-06-15 CN CN2011202031985U patent/CN202119541U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458007A (en) * | 2014-12-12 | 2015-03-25 | 电子科技大学 | Pyroelectric infrared detector |
| CN112714005A (en) * | 2021-01-26 | 2021-04-27 | 深圳市玩视科技有限公司 | PD module and power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |