CN104135264A - Positive feedback processing circuit for processing of methane gas sensor signals - Google Patents
Positive feedback processing circuit for processing of methane gas sensor signals Download PDFInfo
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- CN104135264A CN104135264A CN201410319846.1A CN201410319846A CN104135264A CN 104135264 A CN104135264 A CN 104135264A CN 201410319846 A CN201410319846 A CN 201410319846A CN 104135264 A CN104135264 A CN 104135264A
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Abstract
The present invention discloses a positive feedback processing circuit for processing of methane gas sensor signals, wherein the positive feedback processing circuit comprises a reference voltage generating circuit, a methane gas sensor signal output circuit, a signal holding and driving circuit and a positive feedback amplifying circuit, a signal V1 output from the methane gas sensor signal output circuit and a reference voltage signal V2 output from the reference voltage generating circuit are sent to the signal holding and driving circuit at the same time and processed by the signal holding and driving circuit to form a sensor signal V4 and a reference signal V3 with high driving capability, V2 and V3 are the same in amplitude and phase, V1 and V4 are the same in amplitude and phase, and then V4 and V3 are sent to the positive feedback amplifying circuit so as to obtain a conditioning signal V9.The present invention achieves the reference processing, signal driving capability enhancement processing and positive feedback amplification processing of methane gas sensor signals. The circuit is simple, stable, reliable, less in components, low in cost and easy for market promotion and utilization.
Description
Technical field
The invention belongs to field of gas detection, relate to a kind of gas signal treatment circuit, especially relate to a kind of positive feedback treatment circuit for the processing of methane gas sensor signal.
Background technology
Along with social progress, the development of science and technology, the increase of the mankind to demand for energy, the demand of coal is rapidly increased, and meanwhile, country is for Safety of Coal Mine Production, formulate a series of standard, ensured the personal safety of coal miner and the safety in production in colliery with this.Methane gas is one of key factor threatening Safety of Coal Mine Production, methane gas is inflammable and explosive, Safety of Coal Mine Production and miner's life is caused to serious threat, the main component of methane gas is methane, therefore, the detection of methane gas becomes the key factor of Safety of Coal Mine Production and protection miner life, the detection difficult point of methane gas is the processing to methane gas sensor output signal, for this reason, lot of domestic and international experts and scholars have proposed different processing methods, comprise the precision that improves gas sensor, but its cost is too high, more difficultly on ore deposit, promote, the particularly relatively backward little ore deposit of some technical conditions and economic situation, also have and propose to use high Precision Processing chip solution, there is equally the problem that cost is high in this scheme, make to be suitable for that the equipment of its method is more difficult on market, colliery, promotes.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of positive feedback treatment circuit for the processing of methane gas sensor signal, this treatment circuit uses less discrete component, processing is amplified in the reference process, the enhancing processing of signal driver ability, the positive feedback that have realized methane gas sensor signal, this circuit is simple, reliable and stable, components and parts are few, cost is low, is convenient to marketing utilization.
For achieving the above object, the present invention by the following technical solutions:
A kind of positive feedback treatment circuit for the processing of methane gas sensor signal, wherein, comprise generating circuit from reference voltage, methane gas sensor signal output apparatus, signal maintenance and drive circuit and positive feedback amplifying circuit, the reference voltage signal V2 of described methane gas sensor signal output apparatus output signal V1 and generating circuit from reference voltage output, give signal keeps and drive circuit simultaneously, through the processing of signal maintenance and drive circuit, form strong sensor signal V4 and the reference signal V3 of driving force, V2 is identical with V3 amplitude and phase place, V1 is identical with V4 amplitude and phase place, then by V4, V3 gives positive feedback amplifying circuit and obtains conditioned signal V9.
As preferably, described positive feedback amplifying circuit comprises resistance R 12, R13, R14, R15, R16, R17, R18 and integrated chip U3C, and resistance R 12, R13, R14, R15, R16, R18 resistance equate, R17 is positive feedback resistor; One end of reference signal V3 contact resistance R12, the other end difference contact resistance R13 of resistance R 12 and the negative input end 9 of integrated chip U3C, one end of sensor signal V4 contact resistance R15, the other end difference contact resistance R16 of resistance R 15 and the positive input terminal 10 of integrated chip U3C, the other end difference contact resistance R14 of resistance R 13 and one end of resistance R 17, the other end of the output contact resistance R14 of integrated chip U3C, output conditioned signal V9; The other end of the other end difference contact resistance R17 of resistance R 16 and one end of resistance R 18, another termination GND of resistance R 18.
As preferably, described generating circuit from reference voltage comprises resistance R 10, R11, and potentiometer RP1; Resistance R 10 one end connect respectively power supply VCC and methane gas sensor signal output apparatus, the other end connects respectively end fixed end and the sliding end of potentiometer RP1, the sliding end output reference voltage signal V2 of potentiometer RP1 keeps and drive circuit to signal, one end of another stiff end contact resistance R11 of potentiometer RP1, another termination power supply negative terminal GND of resistance R 11.
As preferably, described methane gas sensor signal output apparatus comprises gas sensor XS6, and 1 end of described gas sensor XS6 connects power supply VCC and resistance R 10,2 end output signal V1 keep and drive circuit to signal, 3 termination power negative terminal GND.
As preferably, described signal keeps and drive circuit comprises integrated chip U3B, U3D, and reference voltage signal V2 connects the positive input terminal 5 of integrated chip U3B, and the negative input end 6 of integrated chip U3B is connected with its output 7, exports reference signal V3; Signal V1 connects the positive input terminal 12 of integrated chip U3D, and the negative input end 13 of integrated chip U3D is connected with its output 14, output sensor signal V4.
As preferably, described integrated chip U3B, U3C, U3D adopt LM324 chip.
The invention has the beneficial effects as follows:
The present invention utilizes less discrete component, realize the setting of the reference voltage to methane gas sensor signal, the enhancing of signal driver ability and positive feedback are amplified, can effectively improve the enhancing processing of the present invention to methane gas sensor output weak signal, and this circuit is simple, make to use stabilization of equipment performance of the present invention and reliability all very high, reduced the cost that uses present device, be convenient to marketing and application.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating below, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be by below specification or accompanying drawing in specifically noted structure realize and obtain.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is that reference voltage of the present invention produces and methane gas sensor signal output apparatus figure;
Fig. 3 is that signal of the present invention keeps and driving force intensifier circuit figure;
Fig. 4 is positive feedback amplification circuit diagram of the present invention;
Fig. 5 is the concrete implementing circuit figure of one of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the present invention includes generating circuit from reference voltage, methane gas sensor signal output apparatus, signal maintenance and drive circuit and positive feedback amplifying circuit, the reference voltage signal V2 of described methane gas sensor signal output apparatus output signal V1 and generating circuit from reference voltage output, give signal keeps and drive circuit simultaneously, through the processing of signal maintenance and drive circuit, form strong sensor signal V4 and the reference signal V3 of driving force, V2 is identical with V3 amplitude and phase place, V1 is identical with V4 amplitude and phase place, then by V4, V3 gives positive feedback amplifying circuit, V4, V3 is through the processing of positive feedback amplifying circuit, form the methane gas sensor conditioned signal V9 that we need, for rear class single-chip microcomputer or AD.
As shown in Figure 2, generating circuit from reference voltage comprises resistance R 10, R11, and potentiometer RP1; Resistance R 10 one end connect respectively power supply VCC and methane gas sensor signal output apparatus, the other end connects respectively end fixed end and the sliding end of potentiometer RP1, the sliding end output reference voltage signal V2 of potentiometer RP1 keeps and drive circuit to signal, one end of another stiff end contact resistance R11 of potentiometer RP1, another termination power supply negative terminal GND of resistance R 11.
Methane gas sensor signal output apparatus comprises gas sensor XS6, and 1 end of described gas sensor XS6 connects power supply VCC and resistance R 10,2 end output signal V1 keep and drive circuit to signal, 3 termination power negative terminal GND.Generating circuit from reference voltage produces the reference voltage signal V2 that we need, for rear class, and the signal V1 that methane gas sensor segment signal output output catalytic gas transducer produces, for rear class, wherein GND is equipment power supply negative terminal.
As shown in Figure 3, signal keeps and drive circuit comprises integrated chip U3B, U3D, and reference voltage signal V2 connects the positive input terminal 5 of integrated chip U3B, and the negative input end 6 of integrated chip U3B is connected with its output 7, output reference signal V3; Signal V1 connects the positive input terminal 12 of integrated chip U3D, and the negative input end 13 of integrated chip U3D is connected with its output 14, output sensor signal V4.Kept through signal and driving force enhancing part by reference voltage produces and methane gas sensor segment signal output is exported signal V2, V1, form very strong driving signal V3, the V4 of load capacity, for rear class positive feedback amplifier section, wherein, V2 is identical with V3 amplitude and phase place, and V1 is identical with V4 amplitude and phase place.
As shown in Figure 4, positive feedback amplifying circuit comprises resistance R 12, R13, R14, R15, R16, R17, R18 and integrated chip U3C.One end of reference signal V3 contact resistance R12, the other end difference contact resistance R13 of resistance R 12 and the negative input end 9 of integrated chip U3C, one end of sensor signal V4 contact resistance R15, the other end difference contact resistance R16 of resistance R 15 and the positive input terminal 10 of integrated chip U3C, the other end difference contact resistance R14 of resistance R 13 and one end of resistance R 17, the other end of the output contact resistance R14 of integrated chip U3C, output conditioned signal V9; The other end of the other end difference contact resistance R17 of resistance R 16 and one end of resistance R 18, another termination GND of resistance R 18.
Wherein, resistance R 12, R13, R14, R15, R16, R18 resistance equate, R17 is positive feedback resistor, decide multiplication factor by R17, R18, by signal keeps and the conveying of driving force enhancing part is come signal V3, V4, through the processing of positive feedback amplifying circuit, form the conditioned signal V9 that we need, wherein V5, V6, V7, V8 are for circuit analysis, and V9 processes for rear class single-chip microcomputer and AD.
According to description above, and can calculate the relation of V9 and V1, V2 according to circuit base knowledge, its pass is
, Fig. 5 has provided a kind of concrete application circuit of the present invention, and has provided the value of each device, but all devices are not limited to this value.
Generating circuit from reference voltage comprises R10, RP1, R11, the resistance that R10 is 10K, and R11 is 8.2K resistance, and RP1 is 2K potentiometer, and XS6 is MJC4/2.8J catalytic gas transducer.Signal keeps and driving force strengthens part, comprise that the signal being made up of integrated chip U3B, U3D keeps and drive circuit, as shown in Figure 3, U3B, U3D are low-power consumption amplifier chip LM324, by the signal of prime input after treatment, form load capacity very strong with original signal with the synchronous signal of amplitude, for rear class.In positive feedback amplifying circuit, R12, R13, R14, R15, R16, R18 are the resistance of 120K, and R17 is 27K resistance.
According to the value of components and parts shown in Fig. 5 and description above, can obtain the fixed relationship of V9 and V1, V2, its pass is
.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other amendments that those of ordinary skill in the art make technical scheme of the present invention or be equal to replacement, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. the positive feedback treatment circuit for the processing of methane gas sensor signal, it is characterized in that: comprise generating circuit from reference voltage, methane gas sensor signal output apparatus, signal maintenance and drive circuit and positive feedback amplifying circuit, the reference voltage signal V2 of described methane gas sensor signal output apparatus output signal V1 and generating circuit from reference voltage output, give signal keeps and drive circuit simultaneously, through the processing of signal maintenance and drive circuit, form strong sensor signal V4 and the reference signal V3 of driving force, V2 is identical with V3 amplitude and phase place, V1 is identical with V4 amplitude and phase place, then by V4, V3 gives positive feedback amplifying circuit and obtains conditioned signal V9.
2. a kind of positive feedback treatment circuit for the processing of methane gas sensor signal according to claim 1, it is characterized in that: described positive feedback amplifying circuit comprises resistance R 12, R13, R14, R15, R16, R17, R18 and integrated chip U3C, resistance R 12, R13, R14, R15, R16, R18 resistance equate, R17 is positive feedback resistor; One end of reference signal V3 contact resistance R12, the other end difference contact resistance R13 of resistance R 12 and the negative input end 9 of integrated chip U3C, one end of sensor signal V4 contact resistance R15, the other end difference contact resistance R16 of resistance R 15 and the positive input terminal 10 of integrated chip U3C, the other end difference contact resistance R14 of resistance R 13 and one end of resistance R 17, the other end of the output contact resistance R14 of integrated chip U3C, output conditioned signal V9; The other end of the other end difference contact resistance R17 of resistance R 16 and one end of resistance R 18, another termination GND of resistance R 18.
3. a kind of positive feedback treatment circuit for the processing of methane gas sensor signal according to claim 2, it is characterized in that: described methane gas sensor signal output apparatus comprises gas sensor XS6,1 end of described gas sensor XS6 connects power supply VCC and resistance R 10,2 end output signal V1 keep and drive circuit to signal, 3 termination power negative terminal GND.
4. a kind of positive feedback treatment circuit for the processing of methane gas sensor signal according to claim 3, it is characterized in that: described signal keeps and drive circuit comprises integrated chip U3B, U3D, reference voltage signal V2 connects the positive input terminal 5 of integrated chip U3B, the negative input end 6 of integrated chip U3B is connected with its output 7, output reference signal V3; Signal V1 connects the positive input terminal 12 of integrated chip U3D, and the negative input end 13 of integrated chip U3D is connected with its output 14, output sensor signal V4.
5. a kind of positive feedback treatment circuit for the processing of methane gas sensor signal according to claim 4, is characterized in that: described generating circuit from reference voltage comprises resistance R 10, R11, and potentiometer RP1; Resistance R 10 one end connect respectively power supply VCC and methane gas sensor signal output apparatus, the other end connects respectively end fixed end and the sliding end of potentiometer RP1, the sliding end output reference voltage signal V2 of potentiometer RP1 keeps and drive circuit to signal, one end of another stiff end contact resistance R11 of potentiometer RP1, another termination power supply negative terminal GND of resistance R 11.
6. a kind of positive feedback treatment circuit for the processing of methane gas sensor signal according to claim 5, is characterized in that: described integrated chip U3B, U3C, U3D adopt LM324 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410319846.1A CN104135264A (en) | 2014-07-08 | 2014-07-08 | Positive feedback processing circuit for processing of methane gas sensor signals |
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| CN201410319846.1A CN104135264A (en) | 2014-07-08 | 2014-07-08 | Positive feedback processing circuit for processing of methane gas sensor signals |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2800267Y (en) * | 2005-05-15 | 2006-07-26 | 中北大学 | Infrared optical gas detector |
| JP2011123016A (en) * | 2009-12-14 | 2011-06-23 | Mitsubishi Electric Corp | Difference absorption lidar device |
| JP2012103231A (en) * | 2010-11-15 | 2012-05-31 | Riken Keiki Co Ltd | Infrared gas detector |
| CN203396701U (en) * | 2013-07-05 | 2014-01-15 | 扬州大学 | Sensor node device for methane content WSN (wireless sensor network) |
| CN204046567U (en) * | 2014-07-08 | 2014-12-24 | 郑州创威煤安科技有限公司 | For the positive feedback treatment circuit of methane gas sensor signal transacting |
-
2014
- 2014-07-08 CN CN201410319846.1A patent/CN104135264A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2800267Y (en) * | 2005-05-15 | 2006-07-26 | 中北大学 | Infrared optical gas detector |
| JP2011123016A (en) * | 2009-12-14 | 2011-06-23 | Mitsubishi Electric Corp | Difference absorption lidar device |
| JP2012103231A (en) * | 2010-11-15 | 2012-05-31 | Riken Keiki Co Ltd | Infrared gas detector |
| CN203396701U (en) * | 2013-07-05 | 2014-01-15 | 扬州大学 | Sensor node device for methane content WSN (wireless sensor network) |
| CN204046567U (en) * | 2014-07-08 | 2014-12-24 | 郑州创威煤安科技有限公司 | For the positive feedback treatment circuit of methane gas sensor signal transacting |
Non-Patent Citations (1)
| Title |
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| 宋刚: "基于SOPC技术的煤矿瓦斯检测仪的设计和研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
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