CN105488960A - Wireless natural gas detector based on self-gain amplification circuit - Google Patents
Wireless natural gas detector based on self-gain amplification circuit Download PDFInfo
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- CN105488960A CN105488960A CN201510963504.8A CN201510963504A CN105488960A CN 105488960 A CN105488960 A CN 105488960A CN 201510963504 A CN201510963504 A CN 201510963504A CN 105488960 A CN105488960 A CN 105488960A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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Abstract
The invention discloses a wireless natural gas detector based on a self-gain amplification circuit. The wireless natural gas detector is composed of a microcontroller, a gas sensor, an A/D conversion chip connected with the gas sensor, a wireless emission circuit connected with the A/D conversion chip, and a power supply, a display, an alarm, a memory and a wireless receiving circuit which are respectively connected with the microcontroller, wherein the wireless emission circuit is connected with the wireless receiving circuit through a wireless network. The wireless natural gas detector is characterized in that the self-gain amplification circuit is also connected in series between the wireless receiving circuit and the microcontroller. According to the invention, signals are transmitted through the wireless network and detectors can detect whether natural gas leaks without arriving at a detection field, such that a safety guarantee is provided for the detectors. At the same time, the self-gain amplification circuit can amplify digital electric signals without distortion so that signal attenuation generated due to long-distance transmission can be made up for, the signals received by the microcontroller can be clearer, and the detection precision of the wireless natural gas detector is improved.
Description
Technical field
The present invention relates to a kind of detector, specifically refer to a kind of based on the wireless natural gas detector from gain amplifying circuit.
Background technology
Along with rock gas is more and more universal, people also more and more pay attention to the use safety of natural gas.Present people use portable natural gas detector whether to have leakage to detect natural gas usually, but natural gas itself also exists diffusion rapidly, the features such as easy blast, after micro-natural gas leaks, at wind-force, under the acting in conjunction of the external conditions such as environment temperature, leakage point can expand rapidly, large-area calamity danger district will be formed within the time that the scene of the accident is extremely short, when people use traditional portable natural gas detector to be tested with when natural gas is revealed as testing staff cannot withdraw at short notice, Site Detection personnel are then easily caused to occur poisoning situation.
Summary of the invention
The object of the invention is to overcome traditional natural gas detector to use at Test Field, bring the defect of personal safety hidden danger to testing staff, provide a kind of based on the wireless natural gas detector from gain amplifying circuit.
Object of the present invention is achieved through the following technical solutions: a kind of based on the wireless natural gas detector from gain amplifying circuit, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and wireless receiving circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network; In order to better implement the present invention, the present invention is also serially connected with from gain amplifying circuit between wireless receiving circuit and microcontroller.
Further, described from gain amplifying circuit by amplifier P1, amplifier P2, amplifier P3, triode VT5, triode VT6, be serially connected in the resistance R11 between the negative pole of amplifier P1 and the positive pole of amplifier P2, positive pole is connected with the negative pole of amplifier P1 after resistance R13, the electric capacity C8 that negative pole is then connected with the positive pole of amplifier P3 after resistance R14, be serially connected in the resistance R15 between the positive pole of amplifier P3 and the emitter of triode VT6, be serially connected in the inductance L 3 between the negative pole of amplifier P3 and the collector of triode VT5, and the resistance R12 be serially connected between the positive pole of amplifier P2 and the base stage of triode VT5 forms, the minus earth of described amplifier P2, its output terminal is then connected with emitter with the base stage of triode VT5 simultaneously, the base stage of described triode VT6 is connected with the collector of triode VT5, its grounded collector, the output terminal of described amplifier P3 then forms this from the output terminal of gain amplifying circuit and is connected with microcontroller, the output terminal of described amplifier P1 is connected with the positive pole of electric capacity C8, and its positive pole then forms this and is connected from the input end of gain amplifying circuit and with the signal output part of wireless receiving circuit.
Described radio transmitter by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
Described mixting circuit is by transformer T, triode VT1, triode VT2, one end is connected with the Same Name of Ends of the former limit telefault of transformer T, the other end then meets the resistance R1 of 5V voltage, be serially connected in the resistance R2 between the Same Name of Ends of the former limit telefault of transformer T and the base stage of triode VT1, positive pole is connected with the collector of triode VT1, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1 after inductance L 1, ground connection while N pole is connected with the negative pole of electric capacity C2, the diode D1 that P pole is then connected with the base stage of triode VT1 after electric capacity C1, the resistance R3 be in parallel with inductance L 1, positive pole is connected with the Same Name of Ends of the former limit telefault of transformer T, the electric capacity C3 of minus earth, resistance R4 between the centre tap being serially connected in the positive pole of electric capacity C3 and the secondary inductance coil of transformer T, N pole is connected with the non-same polarity of the secondary inductance coil of transformer T, the diode D2 that P pole is then connected with the base stage of triode VT2, P pole is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the diode D3 that N pole is then connected with the base stage of triode VT2, and one end is connected with the base stage of triode VT2 after resistance R5, the resistance R6 that the other end is then connected with A/D conversion chip forms, the emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T, the base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
Described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, the diode D4 that N pole is connected with the output terminal of amplifier P, P pole is then connected with the grid of field effect transistor MOS, the electric capacity C4 that positive pole is connected with the negative pole of amplifier P, negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms; The positive pole of described amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit; The grounded drain of described field effect transistor MOS; The emitter of described triode VT3 is then connected with radiating circuit.
Described radiating circuit is by triode VT4, the electric capacity C5 that positive pole is connected with the output terminal of amplifier P, negative pole is then connected with the base stage of triode VT4, be serially connected in the resistance R8 between the base stage of triode VT4 and the emitter of triode VT3, be serially connected in the resistance R10 between the collector of triode VT4 and the emitter of triode VT3, the resistance R9 that one end is connected with the base stage of triode VT4, the other end is then connected with the emitter of triode VT4 after inductance L 2, and the electric capacity C7 that positive pole is connected with the emitter of triode VT4, negative pole connects antenna forms; The tie point of described resistance R9 and inductance L 2 connects 12V voltage.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention is transmitted signal by wireless network, and whether testing staff does not need body to face Test Field can to detect and have natural gas to reveal, thus provides safety guarantee to testing staff.
(2) the present invention is transmitted signal by radio transmitter, and it can process signal, makes signal more stable in the process of long range propagation, thus makes the distance of Signal transmissions of the present invention farther.
(3) the present invention is provided with from gain amplifying circuit, distortionless amplification should can be carried out to digital electric signal from gain amplifying circuit, thus the signal attenuation that compensating signal produces because of long range propagation, make the signal received by microcontroller more clear, improve accuracy of detection of the present invention.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the structural representation of radio transmitter of the present invention.
Fig. 3 is the structural representation from gain amplifying circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, of the present invention based on the wireless natural gas detector from gain amplifying circuit, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and from gain amplifying circuit, the wireless receiving circuit be connected with from gain amplifying circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network.
Wherein, the MD61 type sensor of natural gas that gas sensor adopts Shanghai Mei Si Electronic Science and Technology Co., Ltd. to produce, the sensor of natural gas of this model is highly sensitive, the life-span is long, with low cost.The simulating signal that this A/D conversion chip is used for gas sensor exports is converted to digital electric signal, it preferentially adopts ADC0809 type A/D conversion chip, the EOC pin of this ADC0809 type A/D conversion chip is connected with the output terminal of gas sensor, and its ALE pin is then connected with the signal input part of radio transmitter.This radio transmitter is used for carrying out process afterwards and send to wireless receiving circuit by wireless network to the digital electric signal that A/D conversion chip exports.As shown in Figure 2, this radio transmitter by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
Wherein, described mixting circuit is by transformer T, and triode VT1, triode VT2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, inductance L 1, electric capacity C1, electric capacity C2, electric capacity C3, diode D1, diode D2 and diode D3 form.
During connection, one end of resistance R1 is connected with the Same Name of Ends of the former limit telefault of transformer T, its other end then connects 5V voltage.Between the Same Name of Ends that resistance R2 is serially connected in the former limit telefault of transformer T and the base stage of triode VT1.The positive pole of electric capacity C2 is connected with the collector of triode VT1, its negative pole is then connected with the base stage of triode VT1 after inductance L 1.While the N pole of diode D1 is connected with the negative pole of electric capacity C2, ground connection, its P pole are then connected with the negative pole of electric capacity C1.The positive pole of described electric capacity C1 is then connected with the base stage of triode VT1.Resistance R3 and inductance L 1 are in parallel.The positive pole of electric capacity C3 is connected with the Same Name of Ends of the former limit telefault of transformer T, its minus earth.Resistance R4 is serially connected between the centre tap of the positive pole of electric capacity C3 and the secondary inductance coil of transformer T.The N pole of diode D2 is connected with the non-same polarity of the secondary inductance coil of transformer T, its P pole is then connected with the base stage of triode VT2.The P pole of diode D3 is connected with the Same Name of Ends of the secondary inductance coil of transformer T, its N pole is then connected with the base stage of triode VT2.The signal input part that one end of resistance R6 is connected with the base stage of triode VT2 after resistance R5, its other end then forms this mixting circuit is also connected with the ALE pin of ADC0809 type A/D conversion chip.The emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T.The base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
In said structure, electric capacity C1, diode D1, electric capacity C2 and triode VT1 forms oscillatory circuit, it can produce a local oscillation signal, after the digital electric signal of A/D conversion chip output is come in from the signal input part input of this mixting circuit, mixting circuit carries out mixing digital electric signal and its local oscillation signal, and exports radiofrequency signal to common emitter amplifying circuit.
Described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, the diode D4 that N pole is connected with the output terminal of amplifier P, P pole is then connected with the grid of field effect transistor MOS, the electric capacity C4 that positive pole is connected with the negative pole of amplifier P, negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms.
The positive pole of this amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit.The grounded drain of described field effect transistor MOS.The emitter of described triode VT3 is then connected with radiating circuit.
The radiofrequency signal exported from mixting circuit carries out inputting radiating circuit after distortionless amplification through common emitter amplifying circuit, and radiofrequency signal is after treatment more stable.
Described radiating circuit is by triode VT4, and resistance R8, resistance R9, resistance R10, inductance L 2, electric capacity C5 and electric capacity C7 forms.During connection, the positive pole of electric capacity C5 is connected with the output terminal of amplifier P, its negative pole is then connected with the base stage of triode VT4.Resistance R8 is serially connected between the base stage of triode VT4 and the emitter of triode VT3.Resistance R10 is serially connected between the collector of triode VT4 and the emitter of triode VT3.One end of resistance R9 is connected with the base stage of triode VT4, its other end is then connected with the emitter of triode VT4 after inductance L 2.The electric capacity C7 that positive pole is connected with the emitter of triode VT4, negative pole connects antenna forms.The tie point of described resistance R9 and inductance L 2 connects 12V voltage.This radiofrequency signal sends to wireless receiving circuit by radiating circuit by wireless network.
In addition, wireless receiving circuit is for receiving the radiofrequency signal of radio transmitter transmission.Distortionless amplification can be carried out to digital electric signal from gain amplifying circuit, thus the signal attenuation that compensating signal produces because of long range propagation, make the signal received by microcontroller more clear, as shown in Figure 3, should from gain amplifying circuit by amplifier P1, amplifier P2, amplifier P3, triode VT5, triode VT6, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, inductance L 3 and electric capacity C8 form.
Wherein, resistance R11 is serially connected between the negative pole of amplifier P1 and the positive pole of amplifier P2.The positive pole of electric capacity C8 is connected with the negative pole of amplifier P1 after resistance R13, its negative pole is then connected with the positive pole of amplifier P3 after resistance R14.Resistance R15 is serially connected between the positive pole of amplifier P3 and the emitter of triode VT6.Inductance L 3 is serially connected between the negative pole of amplifier P3 and the collector of triode VT5.Resistance R12 is serially connected between the positive pole of amplifier P2 and the base stage of triode VT5.The minus earth of described amplifier P2, its output terminal is then connected with emitter with the base stage of triode VT5 simultaneously.The base stage of described triode VT6 is connected with the collector of triode VT5, its grounded collector; The output terminal of described amplifier P3 then forms this from the output terminal of gain amplifying circuit and is connected with microcontroller.The output terminal of described amplifier P1 is connected with the positive pole of electric capacity C8, and its positive pole then forms this and is connected from the input end of gain amplifying circuit and with the signal output part of wireless receiving circuit.
This amplifier P1 and amplifier P2 forms first order amplifying circuit, and amplifier P3, triode VT5 and triode VT6 then form second level amplifying circuit, and digital electric signal exports to microcontroller after first order amplifying circuit and second level amplifying circuit amplify.
Microcontroller is then as control center of the present invention, it preferentially adopts MAX716 type micro-chip processor, and the B1 pin of this MAX716 type micro-chip processor is connected with the output terminal from gain amplifying circuit, and its UCC pin connects power supply, its B7 pin connects display, and B5 pin is device taking alarm then.This power supply is used for providing working power to microcontroller, and display is then for showing the concentration value of natural gas, and alarm is then for sounding the alarm when having detected that natural gas is revealed, and this reservoir is then for storing the concentration value of natural gas.This wireless receiving circuit uses prior art to realize.
During work, if natural gas is not revealed, the present invention then can not send alerting signal.When there being natural gas to reveal, gas sensor detects in air and has inflammable gas, the conductivity of gas sensor increases with the increase of combustable gas concentration in air, and gas sensor is converted to the simulating signal corresponding with this combustable gas concentration the change of conductivity and exports to A/D change-over circuit simultaneously.This A/D change-over circuit sends through radio transmitter after simulating signal is converted to digital electric signal.This radio transmitter sends to wireless receiving circuit by wireless network after processing digital electric signal, wireless receiving circuit then sends to digital electric signal from gain amplifying circuit, after gain amplifying circuit carries out distortionless amplification digital electric signal, send to microcontroller.The digital electric signal of microcontroller to input identifies and sends to display, reservoir and alarm respectively after being converted to natural gas concentration signal, this display demonstrates combustable gas concentration value, reservoir then stores this natural gas concentration value, and alarm sounds the alarm simultaneously.
As mentioned above, just well the present invention can be realized.
Claims (6)
1. one kind based on the wireless natural gas detector from gain amplifying circuit, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and wireless receiving circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network; It is characterized in that, be also serially connected with from gain amplifying circuit between wireless receiving circuit and microcontroller.
2. according to claim 1 a kind of based on the wireless natural gas detector from gain amplifying circuit, it is characterized in that: described from gain amplifying circuit by amplifier P1, amplifier P2, amplifier P3, triode VT5, triode VT6, be serially connected in the resistance R11 between the negative pole of amplifier P1 and the positive pole of amplifier P2, positive pole is connected with the negative pole of amplifier P1 after resistance R13, the electric capacity C8 that negative pole is then connected with the positive pole of amplifier P3 after resistance R14, be serially connected in the resistance R15 between the positive pole of amplifier P3 and the emitter of triode VT6, be serially connected in the inductance L 3 between the negative pole of amplifier P3 and the collector of triode VT5, and the resistance R12 be serially connected between the positive pole of amplifier P2 and the base stage of triode VT5 forms, the minus earth of described amplifier P2, its output terminal is then connected with emitter with the base stage of triode VT5 simultaneously, the base stage of described triode VT6 is connected with the collector of triode VT5, its grounded collector, the output terminal of described amplifier P3 then forms this from the output terminal of gain amplifying circuit and is connected with microcontroller, the output terminal of described amplifier P1 is connected with the positive pole of electric capacity C8, and its positive pole then forms this and is connected from the input end of gain amplifying circuit and with the signal output part of wireless receiving circuit.
3. according to claim 1 a kind of based on the wireless natural gas detector from gain amplifying circuit, it is characterized in that: described radio transmitter is by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
4. according to claim 3 a kind of based on the wireless natural gas detector from gain amplifying circuit, it is characterized in that: described mixting circuit is by transformer T, triode VT1, triode VT2, one end is connected with the Same Name of Ends of the former limit telefault of transformer T, the other end then meets the resistance R1 of 5V voltage, be serially connected in the resistance R2 between the Same Name of Ends of the former limit telefault of transformer T and the base stage of triode VT1, positive pole is connected with the collector of triode VT1, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1 after inductance L 1, ground connection while N pole is connected with the negative pole of electric capacity C2, the diode D1 that P pole is then connected with the base stage of triode VT1 after electric capacity C1, the resistance R3 be in parallel with inductance L 1, positive pole is connected with the Same Name of Ends of the former limit telefault of transformer T, the electric capacity C3 of minus earth, resistance R4 between the centre tap being serially connected in the positive pole of electric capacity C3 and the secondary inductance coil of transformer T, N pole is connected with the non-same polarity of the secondary inductance coil of transformer T, the diode D2 that P pole is then connected with the base stage of triode VT2, P pole is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the diode D3 that N pole is then connected with the base stage of triode VT2, and one end is connected with the base stage of triode VT2 after resistance R5, the resistance R6 that the other end is then connected with A/D conversion chip forms, the emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T, the base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
5. according to claim 4 a kind of based on the wireless natural gas detector from gain amplifying circuit, it is characterized in that: described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, N pole is connected with the output terminal of amplifier P, the diode D4 that P pole is then connected with the grid of field effect transistor MOS, positive pole is connected with the negative pole of amplifier P, the electric capacity C4 that negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms, the positive pole of described amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit, the grounded drain of described field effect transistor MOS, the emitter of described triode VT3 is then connected with radiating circuit.
6. according to claim 5 a kind of based on the wireless natural gas detector from gain amplifying circuit, it is characterized in that: described radiating circuit is by triode VT4, positive pole is connected with the output terminal of amplifier P, the electric capacity C5 that negative pole is then connected with the base stage of triode VT4, be serially connected in the resistance R8 between the base stage of triode VT4 and the emitter of triode VT3, be serially connected in the resistance R10 between the collector of triode VT4 and the emitter of triode VT3, one end is connected with the base stage of triode VT4, the resistance R9 that the other end is then connected with the emitter of triode VT4 after inductance L 2, and positive pole is connected with the emitter of triode VT4, the electric capacity C7 that negative pole connects antenna forms, the tie point of described resistance R9 and inductance L 2 connects 12V voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510963504.8A CN105488960A (en) | 2015-12-19 | 2015-12-19 | Wireless natural gas detector based on self-gain amplification circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510963504.8A CN105488960A (en) | 2015-12-19 | 2015-12-19 | Wireless natural gas detector based on self-gain amplification circuit |
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| CN105488960A true CN105488960A (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510963504.8A Withdrawn CN105488960A (en) | 2015-12-19 | 2015-12-19 | Wireless natural gas detector based on self-gain amplification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106408883A (en) * | 2016-10-18 | 2017-02-15 | 哈尔滨理工大学 | Combustible gas alarm system |
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Application publication date: 20160413 |