CN201181285Y - Methane sensor signal output circuit - Google Patents
Methane sensor signal output circuit Download PDFInfo
- Publication number
- CN201181285Y CN201181285Y CNU2008200345435U CN200820034543U CN201181285Y CN 201181285 Y CN201181285 Y CN 201181285Y CN U2008200345435 U CNU2008200345435 U CN U2008200345435U CN 200820034543 U CN200820034543 U CN 200820034543U CN 201181285 Y CN201181285 Y CN 201181285Y
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- China
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- operational amplifier
- resistance
- resistor
- output
- terminal
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- Expired - Lifetime
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Abstract
The utility model relates to a methanol sensor signal output circuit. A signal input terminal T1 of the circuit is connected with the positive electrode of a comparison terminal of an operational amplifier IC1; a power supply terminal VCC is connected with the negative electrode of the comparison terminal of the operational amplifier IC1 through a resistor R6, is connected between a resistor R1 and a resistor R5 through a resistor R4 and a capacitor C1 connected with each other in parallel, and is connected with the positive electrode of the comparison terminal of the operational amplifier IC1 through the capacitor C1; a signal input terminal TXD is connected with the power supply terminal VCC; the base of a transistor G1 is connected between a resistor R2 and a resistor R3 and is connected with the output terminal of the operational amplifier IC1 through a diode D1; the emitter of the transistor G1 is connected with the negative electrode of the comparison terminal of the operational amplifier IC1; and the collector of the transistor G1 is connected with the distant signal transmission output terminal T7 of a sensor. The methanol sensor signal output circuit integrates transmission circuits of signals of various modes and is simple.
Description
Technical field
The utility model relates to a kind of methane sensor signal output circuit that is used for the transmission of methane transducer signal in the coal mine safety monitoring system.
Background technology
In the coal mine safety monitoring system, be installed in the signal transmission between connecting of the methane transducer of down-hole and control device multiple standard is arranged, its effect be with sensor acquisition to signal be delivered to outstation outside several kilometers with cable, must not introduce decay and distortion in the transmission course.The equipment that sensor connects has multiple different standard, usually adopt: the output of 200-1000HZ pulsed frequency, the output of 4-20mA analog current, the output of asynchronous serial digital signal, every kind of output all will have independent driving circuits, mutually can not compatible exchange, can't be implemented in multiple multiple display modes compatible on the sensor, cause a product to derive many specifications, bring inconvenience to the onsite user.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of transmission circuit of signal of integrated multiple standard, the output of analog quantity electric current, frequency pulse output and serial digital signal output can be incorporated into one drives on the port, need not to switch the compatibility mode of hardware and just can realize the conversion of multiple output standard and the simple and reliable methane sensor signal output circuit of circuit by software setting.
Methane sensor signal output circuit of the present utility model includes the signal input part T1 that is connected with the driving pin of single-chip microcomputer, exports signal input part TXD that is connected into pin and the power end VCC that is connected with direct supply with the I/O of single-chip microcomputer; Described signal input part T1 is connected with the utmost point of relatively rectifying of an operational amplifier IC1 with R5 through the resistance R 1 that is connected in series successively, power end VCC is connected to the relatively end negative pole of operational amplifier IC1 through resistance R 6, power end VCC is connected between resistance R 1 and the R5 through parallel resistor R4 and capacitor C 1, power end VCC is connected to the relatively more proper utmost point of operational amplifier IC1 through capacitor C 1, described signal input part TXD is connected with power end VCC with R3 through the resistance R 2 that is connected in series successively, the base stage of a triode G1 is connected between resistance R 2 and the R3, the base stage of triode G1 also is connected to the output terminal of operational amplifier IC1 through diode D1, the emitter of triode G1 is connected with the relatively end negative pole of operational amplifier IC1, and the collector of triode G1 is connected with sensor signal teletransmission output terminal T7 through resistance R 7.
When the utility model is used for the output of methane transducer signal, only need the circuit kit just can all output standards of compatibility, can finish constant-current pulse output, analog current output, serial digital signal output, and the mode that can use single-chip microcomputer to pass through software setting easily realizes the conversion of pulse output, electric current output, digital signal output, thereby improved greatly different size standard equipment adaptability, made things convenient for use.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
In the circuit, T7 is a sensor signal teletransmission output terminal as shown in the figure, links to each other with the input of substation signal through cable; The T1 end connects the Micro Controller Unit (MCU) driving pin, be set at output port, on T1, export square-wave pulse signal by software, this output signal produces the constant current reference voltage through R1, R4 divider resistance, reference voltage is created on the dividing point of R1, R4, behind R5, C1, C2 smothing filtering, generate stable benchmark voltage and be superimposed upon C2 two ends, this reference voltage is connected operational amplifier IC1 and relatively rectifies on the utmost point pin 5, by adjusting T1 output signal width, change the aanalogvoltage reference signal that pulse duty factor just can produce continuous variable;
Operational amplifier IC1, current sampling resistor R6, three devices of output driving transistors G1 constitute feedback constant current loop, pressure drop on the R6 is compared with the reference voltage on the C2, strong feedback loop forces the pressure drop on the R6 to equal reference voltage, thereby convert voltage signal to change constant current output signal, hold teletransmission to outstation by T7 with reference voltage.The constant current signal of high impedance is not influenced by cable resistance can in transmission course, realizes the analog quantity accurate transfer;
The I/O that the TXD end connects single-chip microcomputer exports into pin, be set at output port, hold as pulsed frequency, present high level when being operated in the analog current output state, output there is not influence, when pulsed frequency output standard, simulating signal T1 is set to high level, make the constant current benchmark reach peak value 10mA, this moment, the TXD end carried out the switching regulator modulation to the 220-1000HZ signal that software produces to the 10mA constant current, produce constant-current pulse by the T7 end yet and be delivered to substation, because pulse amplitude also has constant-current characteristics, amplitude can not change with cable length in transmission course;
The TXD end also is the serial output terminal mouth in single-chip microcomputer, when needs are communicated by letter with data communications equipment, can carry out initializing set to port by software, select the asynchronous serial output of required protocol format, the signal of output code is similar to pulsed frequency, also is the pulse current of constant-current characteristics.
Claims (1)
1, a kind of methane sensor signal output circuit is characterized in that: it includes the signal input part T1 that is connected with the driving pin of single-chip microcomputer, exports signal input part TXD that is connected into pin and the power end VCC that is connected with direct supply with the I/O of single-chip microcomputer; Described signal input part T1 is connected with the utmost point of relatively rectifying of an operational amplifier IC1 with R5 through the resistance R 1 that is connected in series successively, power end VCC is connected to the relatively end negative pole of operational amplifier IC1 through resistance R 6, power end VCC is connected between resistance R 1 and the R5 through parallel resistor R4 and capacitor C 1, power end VCC is connected to the relatively more proper utmost point of operational amplifier IC1 through capacitor C 1, described signal input part TXD is connected with power end VCC with R3 through the resistance R 2 that is connected in series successively, the base stage of a triode G1 is connected between resistance R 2 and the R3, the base stage of triode G1 also is connected to the output terminal of operational amplifier IC1 through diode D1, the emitter of triode G1 is connected with the relatively end negative pole of operational amplifier IC1, and the collector of triode G1 is connected with sensor signal teletransmission output terminal T7 through resistance R 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200345435U CN201181285Y (en) | 2008-04-30 | 2008-04-30 | Methane sensor signal output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200345435U CN201181285Y (en) | 2008-04-30 | 2008-04-30 | Methane sensor signal output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201181285Y true CN201181285Y (en) | 2009-01-14 |
Family
ID=40250784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200345435U Expired - Lifetime CN201181285Y (en) | 2008-04-30 | 2008-04-30 | Methane sensor signal output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201181285Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261238B (en) * | 2008-04-30 | 2010-12-29 | 镇江中煤电子有限公司 | Methane sensor signal output circuit |
| CN104225834A (en) * | 2014-10-02 | 2014-12-24 | 吴建平 | Novel dust protection mask |
| CN104713911A (en) * | 2015-03-06 | 2015-06-17 | 天津市傲绿农副产品集团股份有限公司 | Anticorrosive detection device for fruits and vegetables |
-
2008
- 2008-04-30 CN CNU2008200345435U patent/CN201181285Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261238B (en) * | 2008-04-30 | 2010-12-29 | 镇江中煤电子有限公司 | Methane sensor signal output circuit |
| CN104225834A (en) * | 2014-10-02 | 2014-12-24 | 吴建平 | Novel dust protection mask |
| CN104713911A (en) * | 2015-03-06 | 2015-06-17 | 天津市傲绿农副产品集团股份有限公司 | Anticorrosive detection device for fruits and vegetables |
| CN104713911B (en) * | 2015-03-06 | 2017-11-28 | 天津市傲绿农副产品集团股份有限公司 | Fruit and vegetables corrosion protection detection means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090114 Effective date of abandoning: 20080430 |