CN101532986A

CN101532986A - Low power consumption wireless gas detecting device

Info

Publication number: CN101532986A
Application number: CN 200910030457
Authority: CN
Inventors: 童敏明; 吴国庆; 童紫原; 刘晓文; 王虎
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2009-04-10
Filing date: 2009-04-10
Publication date: 2009-09-16
Anticipated expiration: 2029-04-10
Also published as: CN101532986B

Abstract

The invention discloses a low power consumption wireless gas detecting device, which comprises a power supply circuit, a gas catalyzing element, a detection circuit connected with the gas catalyzing element, and a microprocessor connected with the detection circuit; the output end of the microprocessor is respectively connected with a display circuit displaying a gas detection result, a wireless communication circuit and a voltage control circuit; the output end of the voltage control circuit is connected with the detection circuit to control the working voltage of the gas catalyzing element; and the power supply circuit consists of three nickel-hydrogen batteries providing 3.6 V voltage, a battery protecting chip, a stabilized voltage supply chip and a capacitor. The low power consumption wireless gas detecting device adopts wireless communication technology, constant-temperature gas detecting technology and intelligent control of the working voltage of the gas catalyzing element, so that the low power consumption wireless gas detecting device has the advantages of flexible and quick gas detection, strong anti-interference, stability and reliability, low power consumption, small volume, low cost and convenient use.

Description

Low power consumption wireless gas detecting device

Technical field

The present invention relates to gas detecting device, especially a kind of low power consumption wireless gas detecting device that is applicable under the coal mine.

Technical background

Gas is one of great disaster of Coal Production, and it is one of effective measures that prevent Gas Explosion Accidents in Coal Mines that mine gas is carried out the real-time reliable monitoring.The gas monitor in each big colliery of China at present roughly is divided into portable gas explosion monitoring instrument and gas monitoring system.The portable gas explosion monitor, simple in structure, easy to carry, but have only the carrier can know the gas density at this place at any time, outfit and the staff on mine can not understand the gas density situation of mine; Another kind of is gas density monitoring system based on PC, and the gas monitor sensor is installed in place fixing under mine, by very long cable the data such as concentration of testing is passed to pulpit above the colliery again.There are two aspect defectives in wired monitoring mode: one, owing to adopt wired mode to transmit, system is stronger for the dependence of circuit, and can there be the situation of difficult wiring in some place in mine; Two, the coal-mine gas monitoring system comprising of wired mode when some gas monitor sensor by wired connection breaks down, will cause that the local area loses monitoring function in the monitored area.

Summary of the invention

The objective of the invention is to overcome the weak point of prior art, provide a kind of simple in structure, adaptive capacity to environment is strong, stable work in work, the low power consumption wireless gas detecting device that reliability is high.

Low power consumption wireless gas detecting device of the present invention, comprise power circuit, the gas catalysis element, the testing circuit that is connected with the gas catalysis element, the microprocessor that is connected with testing circuit, the output terminal of described microprocessor is connected with display circuit, radio communication circuit and the voltage control circuit that shows the gas testing result respectively, and the output terminal of voltage control circuit is connected with testing circuit, with the operating voltage of control gas catalysis element; Described power circuit is by three abridged edition peace Ni-MH battery group, battery protection chip, reference voltage chip, field effect transistor and electric capacity that 3.6V voltage is provided, and resistance is formed.

Described display circuit is made of display control chip and four coupled eight sections light emitting diodes; Described voltage control circuit is made of analog-digital chip and peripheral resistance capacitance; Described radio communication circuit is made of embedded radio communication module and peripheral resistance and light emitting diode.

Beneficial effect of the present invention: adopt voltage control circuit that catalysis element voltage is carried out Based Intelligent Control, reduced the power consumption that gas detects; Device can be located at any place that need detect in real time gas density, down-hole, pass through wireless network communication technique, the gas density information of each monitoring node is transferred to the main control node fast by wireless mode to be analyzed and handles, the blind area of not staying gas to detect effectively ensures the safety in production of down-hole.It is simple in structure, and is easy to use, low in energy consumption, and steady operation is realized comprehensive, the real-time monitoring of coal-mine gas for a long time.

Description of drawings

Fig. 1 is a structured flowchart of the present invention.

Fig. 2 is low power consumption wireless gas detecting device circuit theory diagrams of the present invention.

Fig. 3 is a radio communication process flow diagram of the present invention.

Among the figure: the 1-testing circuit; The 2-radio communication circuit; The 3-power circuit; The 4-microcontroller circuit; The 5-digital display circuit; The 6-voltage control circuit; 7-gas catalysis element.

Embodiment

Embodiment in the following structure accompanying drawing does into the description in step down to the present invention:

Shown in Figure 1, low power consumption wireless gas detecting device is made up of testing circuit 1, radio communication circuit 2, power circuit 3, microcontroller circuit 4, digital display circuit 5, voltage control circuit 6 and gas catalysis element 7.It is the catalytic combustion method gas sensor of MC113 that gas catalysis element 7 is selected model for use, and gas catalysis element 7 utilizes combustible gas content in the oxidizing fire Characteristics Detection air of inflammable gas, is the inflammable gas sensor special.The output terminal of gas catalysis element 7 is connected with the input end of testing circuit 1, the output terminal of testing circuit 1 is connected with the input end of microprocessor 4, the output terminal of microprocessor 4 connects display circuit 5, radio communication circuit 2 and the voltage control circuit 6 that shows the gas testing result respectively, the output terminal of voltage control circuit 6 is connected with observation circuit 1, with the operating voltage of control gas catalysis element 7; Power circuit 3 links to each other with testing circuit 1, microprocessor 4 and radio communication circuit 2 respectively, and power supply is provided.

Shown in Figure 2, microcontroller circuit 4 comprises single-chip microcomputer M8 (ATmega8), 1 pin of M8 is by capacitor C 12 ground connection, 2,3 pin are corresponding to connect 16 of embedded radio communication module U4 (SZO5) in the

radio communication circuit

2,15 pin, 7 pin connect power supply VCC, 9, the corresponding two ends that connect OSC chip (crystal oscillator 7.3728 chips) of 10 pin, OSC chip two ends also connect two capacitor C 1 and C2 respectively, C1 and C2 ground connection, 14,15,16 pin are corresponding to connect 4 of display control chip U3 (CH452) in the

digital display circuit

5,5,6 pin, the 21 pin C11 that is linked in sequence, the reference voltage AVCC of C10 and AD conversion, C10 and C11 ground connection, AVCC connects power supply VCC by inductance L 1, VCC is by capacitor C 9 ground connection, the

resistance R

25,26 of 23 pin

connection detection circuit

1,27,28 pin are corresponding to connect 3 of analog-digital chip U6 (TLC5615) in the

voltage control circuit

6,2,1 pin, 20 pin meet the reference voltage AVCC of AD conversion.22 pin ground connection.The termination VCC of-L1, another termination AVCC; 9 pin of the termination M8 of C1, other end ground connection; 10 pin of the termination M8 of C2, other end ground connection; 21 pin of the termination M8 of C11, other end ground connection; 1 pin of the termination M8 of C12, other end ground connection; The termination VCC of C9, other end ground connection; 9 pin of the termination M8 of C11, other end ground connection; The termination VCC of C9, other end ground connection; The termination AVCC of C10, other end ground connection.

Testing circuit 1 is by gas catalysis element J5 (MC113), single supply operational amplifier U5A, U5B (LM358), and PNP triode Q1 and resistance R 15-R25 capacitor C 15, C16 form.5 pin of U5 connect 2,3 pin of J5 simultaneously, 6 pin of U5 are connected to 7 pin of analog-digital chip U6 in the voltage control circuit 6 by

resistance R

18, and 7 pin of U5 connect the base stage of Q1, and 8 pin connect the VCC power supply, 4 pin ground connection, 2 pin be linked in sequence resistance R 24, R17 and be connected with 1 pin, 1 pin meets output resistance R25, and 3 pin connect resistance R 22 and R23 simultaneously, R23 ground connection, R22 connects resistance R 15, R16 simultaneously, and R15 connects reference voltage V DD, R16 ground connection; 1 pin of J5 connects collector and the resistance R 19 of Q1 simultaneously, and R19 connects R20, and R20 ground connection is parallel with capacitor C 16 at R19, R20 two ends, the 4 pin ground connection of J5.The emitter of Q1 meets power supply VCC.1 pin of the termination R25 of C15, other end ground connection; 1 pin of C16 connects 1 pin of J5,2 pin ground connection; 1 pin of the termination U5 of R24,2 pin of another termination U5; 3 pin of the termination U5 of R23, other end ground connection; 3 pin of the termination U5 of R22, the other end meets R16 and R15 simultaneously; The end of the termination R22 of R16, other end ground connection; The end of the termination R16 of R15, another termination VDD.6 pin of the termination U5 of R18,7 pin of another termination U6; 2 pin of the termination U5 of R21, the end of another termination R19; 1 pin of the termination J5 of R19, the end of another termination R20; The end of the termination R19 of R20, other end ground connection.

Voltage control circuit 6 comprises that model is the analog-digital chip U6 of TLC5615, corresponding respectively 26,27,28 pin that connect M8 of 1,2,3 pin of analog-digital chip U6,5 pin ground connection, 6 pin connect AVCC, the R18 of resistance in the 7 pin

connection detection circuit

1,8 pin connect VCC and capacitor C 17 simultaneously, 8 pin of the termination U6 of C17, other end ground connection.

Radio communication circuit 2 is made up of embedded radio communication module U4 (SZO5) and peripheral resistance and light emitting diode D2, D3, D4, D5.Wireless communication module U4 adopts SZO5 series embedded radio communication module, integrated radio-frequency (RF) transceiver and the microprocessor that meets the ZIGBEE consensus standard, advantage and characteristic such as it has, and communication distance is far away, antijamming capability strong, networking flexibility, dependable performance are stable; Can realize point-to-point, a bit to multiple spot, equipment room transparent data transmission between multi-multipoint; Can form star-like, tree type and honeycomb type mesh network topology.The corresponding respectively negative electrode that connects four light emitting diodes of D1～D4 of 1,2,3,4 pin of U4, the corresponding respectively resistance R 11～R14 that connects of the anode of D1～D4, R11～R14 all connects VCC, 7,8,9 pin connect 2,4,6 pin of the corresponding JP1 of connection of wire jumper contact pin, 15, corresponding 2,3 pin that connect M8 of 16 pin, 14,18 pin ground connection, 17 pin meet VCC, 1,3, the 5 pin ground connection of JP1.The end of R11～R14 meets VCC respectively, and the other end is the anode of D1～D4 respectively.Wireless module U4 is connected with single-chip microcomputer M8 by the RS-232 serial ports, constitutes the gas detecting device with radio communication function.A plurality of wireless gas detecting devices can organize themselves into and be star-like wireless network architecture, each wireless gas detecting device is as a functional node in the wireless network, wireless communication protocol by standard detects data upload to network main control node with gas, carries out the comprehensive and analyzing and processing of information.

Digital display circuit 5 is by display control chip U3 (CH452), and four eight sections light emitting diode 4LED and resistance constitute.Corresponding respectively 15,16,17 pin that connect M8 of 4,5,6 pin of display control chip U3,11, corresponding respectively 12,9,8,6 pin that connect 4LED of 12,13,14 pin, 18,19,20,21,22,23,24,1 pin is by corresponding respectively 11,7,4,2,1,10,5,3 pin that connect 4LED of current-limiting resistance R3～R10,2,17 pin meet 3VCC, 15 pin ground connection.

Power circuit 3 is made up of three abridged edition peace Ni-MH battery group, battery protection chip U1 (R5421), reference voltage chip U2 (TL431), field effect transistor and electric capacity, resistance.Three joint Ni-MH battery series limiting resistor RO provide 3.6V voltage VCC.Battery protection chip U1 is responsible for monitoring cell voltage and loop current; and control the grid of two field effect transistor; field effect transistor plays on-off action in circuit; controlling the conducting and the shutoff of charge circuit and discharge loop respectively; C5 is a delay capacitor, and this circuit has additives for overcharge protection, over, overcurrent protection and short-circuit protection function.1 pin of U1 connects the grid of field effect transistor Q2, and 2 pin of U1 connect resistance R 2 and capacitor C 4, R2 ground connection, C4 ground connection simultaneously, 3 pin of U1 connect the grid of field effect transistor Q3, and 4 pin of U1 are by capacitor C 5 ground connection, and 5 pin of U1 are connecting resistance R1 and C3 simultaneously, R1 meets voltage VCC, C3 ground connection, the 6 pin ground connection of U1.The source electrode of field effect transistor Q2 connects the positive pole of diode D6, and the drain electrode of Q2 connects the negative pole of D6 and the source electrode of Q3 simultaneously, and the grid of Q2 connects 1 pin of U1.The source electrode of field effect transistor Q3 connects the drain electrode of negative pole and the Q2 of diode D7 simultaneously, and the drain electrode of Q3 connects the positive pole of D7, and the grid of Q3 connects 3 pin of U1.3 pin of U2 meet VCC by resistance R 2, the 1 pin ground connection of U2, and 2 pin of U2 are connected the reference voltage V DD that exports 2.5V with 3 pin, and VDD passes through capacitor C 6 respectively, C7, C8 ground connection, VCC passes through capacitor C 13, C14 ground connection respectively.The anode of D5 meets VCC, and the negative electrode of D5 is by R26 ground connection.

Shown in Figure 3, the radio communication flow process:

If each pick-up unit is a functional node.

System initialization adds network with the functional node application, obtains the node distribution network number that adds network;

Send the adding network signal, judge whether the adding network is successful;

, do not return and resend the adding network signal;

Be, the network function node is carried out methane Concentration Measurement, gather gas and detect data;

Whether judgment data is effective;

, do not return image data again;

Be, send and detect data, on the one hand the data that detect are shown in this locality that the form with packet is wirelessly transmitted to the comprehensive and analyzing and processing that Control Node is carried out data on the other hand.

Claims

1. low power consumption wireless gas detecting device, comprise power circuit (3), gas catalysis element (7), the testing circuit (1) that is connected with gas catalysis element (7), the microprocessor (4) that is connected with testing circuit (1), it is characterized in that: the output terminal of described microprocessor (4) is connected with display circuit (5), radio communication circuit (2) and the voltage control circuit (6) that shows the gas testing result respectively, the output terminal of voltage control circuit (6) is connected with testing circuit (1), with the operating voltage of control gas catalysis element (7); Described power circuit (3) is by three abridged edition peace Ni-MH battery group, battery protection chip (R5421), reference voltage chip (TL431), field effect transistor and electric capacity that 3.6V voltage is provided, and resistance is formed.

2. a kind of low power consumption wireless gas detecting device according to claim 1 is characterized in that: described display circuit (5) is made of display control chip (CH452) and coupled four eight sections light emitting diodes (4LED).

3. a kind of low power consumption wireless gas detecting device according to claim 1 is characterized in that: described voltage control circuit (6) is made of analog-digital chip (TLC5615) and peripheral resistance capacitance.

4. a kind of low power consumption wireless gas detecting device according to claim 1 is characterized in that: described radio communication circuit (2) is made of embedded radio communication module (SZ05) and light emitting diode.