CN201742295U - Frequency/voltage converting circuit applied to various sensors - Google Patents
Frequency/voltage converting circuit applied to various sensors Download PDFInfo
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- CN201742295U CN201742295U CN2010202435058U CN201020243505U CN201742295U CN 201742295 U CN201742295 U CN 201742295U CN 2010202435058 U CN2010202435058 U CN 2010202435058U CN 201020243505 U CN201020243505 U CN 201020243505U CN 201742295 U CN201742295 U CN 201742295U
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- frequency
- voltage
- modular converter
- stepping
- shelves
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- 238000006243 chemical reaction Methods 0.000 claims description 31
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- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000006978 adaptation Effects 0.000 claims description 8
- 230000003044 adaptive effect Effects 0.000 abstract 8
- 239000003990 capacitor Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
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- 230000002463 transducing effect Effects 0.000 description 1
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- 238000013519 translation Methods 0.000 description 1
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Abstract
The utility model discloses a frequency/voltage converting circuit applied to various sensors, which comprises a frequency adaptive controller and a frequency/voltage converting module, wherein the resistance output end of a charge pump of the frequency/voltage converting module is connected with an adjustable resistor, and the stepping control end of the frequency adaptive controller is connected with a sliding contact of the adjustable resistor; the frequency adaptive controller comprises a frequency file signal input end, and a frequency file signal is input into the frequency adaptive controller from the frequency file signal input end and is converted into a stepping control signal by the frequency adaptive controller to control the stepping control end of the frequency adaptive controller so as to adjust the adjustable resistor; and when the multi-file frequency are converted into the multi-file voltage, the frequency adaptive controller can drive the adjustable resistor to be changed so as to realize that the multi-file frequency can be converted into the voltage in the same circuit by searching the corresponding stepping number due to a frequency file/stepping number counter meter which is built in the frequency adaptive controller when the frequency files are changed.
Description
Technical field
The utility model relates to a kind of sensor frequency voltage conversion circuit, is specifically related to a kind of frequency-voltage conversion circuit that is applicable to multiple sensors.
Background technology
The transducer that the colliery of prior art is used to detect continuous physical quantity adopts the frequency output form more, frequency output standard often has 1000Hz, 2000Hz, 5000Hz etc. multiple, and these transducers comprise gas concentration sensor, negative pressure (pressure) transducer, air velocity transducer, liquid level sensor, material level gauge, temperature sensor, carbon monoxide transducer and all the other are with the smart machine of frequency as data transfer means.
For the frequency output transducer, system is in order to obtain the size of sensor measurement parameter, adopt dual mode to carry out sensor signal subsequent treatment 1 in follow-up phase) directly obtain the transducer output frequency signal, promptly need carry out processing such as shaping pulse, CPU software counting or frequency revolving die plan, analog sampling to the frequency output transducer; Not only increase the weight of transducer follow-up signal processing hardware cost, also increased the weight of the burden of CPU, reduced the stability of a system of detection system.2) utilize transducer output frequency voltage conversion circuit, the frequency signal of transducer output is converted into tractable voltage signal, carry out the subsequent treatment of transducing signal again, because voltage signal is lower to circuit precision, hardware device requirement than the processing of frequency signal, so this is a kind of mode that generally adopts at present; But there are single, the characteristics that circuit design is only changed at a kind of type sensor of a frequency band of circuit form in the frequency-voltage conversion circuit of prior art, and the frequency translation scope of circuit is fixing non-adjustable.
The utility model content
In view of this, in order to address the above problem, the utility model discloses a kind of frequency-voltage conversion circuit that is applicable to multiple sensors, by the frequency adaptation controller in the regulating circuit, realized that under the situation that does not change circuit unit the dissimilar sensor that can hold different frequency range in same circuit design simultaneously carries out the voltage to frequency conversion.
The purpose of this utility model is achieved in that a kind of frequency-voltage conversion circuit that is applicable to multiple sensors, comprises frequency adaptation controller and voltage to frequency modular converter, and the charge pump output resistance end of voltage to frequency modular converter is connected with adjustable resistance; The frequency adaptation controller comprises frequency shelves stepping modular converter and stepper, frequency shelves signal incoming frequency shelves stepping modular converter, be converted to the stepping control signal through overfrequency shelves stepping modular converter and export stepper to, stepper stepping control end is connected with the resistance adjustment end of adjustable resistance.
Further, adjustable resistance is a sliding contact formula adjustable resistance, and stepper stepping control end is connected with the sliding contact of adjustable resistance;
Further, the voltage to frequency modular converter is the LM2917 chip;
Further, the sensor frequency input of voltage to frequency modular converter is connected with optical coupling isolation circuit; Optical coupling isolation circuit comprises optical coupler, DC power supply, frequency signal output carrying resistance; Optical coupler comprises light-emitting diode and phototriode, light-emitting diode is connected with the input frequency signal end, photosensitive subtend Light-Emitting Diode illuminating part of phototriode, the collector electrode of phototriode connects DC power supply, the emitter of phototriode connects frequency signal output carrying resistance, and the frequency signal input end of voltage to frequency modular converter is connected with the emitter of phototriode.
The beneficial effects of the utility model are: under the situation that does not change circuit unit, by adjusting the adjustable resistance that is connected with the charge pump output resistance end of voltage to frequency modular converter, realize the voltage to frequency conversion of different shelves frequencies in same frequency-voltage conversion circuit; In frequency shelves stepping modular converter,, realized the automatic switchover of different shelves voltage to frequency conversion by storing frequencies shelves/number of steps correspondence table; Frequency signal input end at the voltage to frequency modular converter is connected with optical coupling isolation circuit, has got rid of the installation of intrinsic safety electric source in the frequency-voltage conversion circuit, the fail safe of the change-over circuit of raising.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 shows the frequency-voltage conversion circuit structure;
Fig. 2 shows the frequency adaptation controller architecture;
Fig. 3 shows the optical coupling isolation circuit structure.
Embodiment
Below will describe in detail preferred embodiment of the present utility model.
As shown in Figure 1, frequency-voltage conversion circuit comprises frequency adaptation controller and voltage to frequency modular converter U4, the voltage to frequency modular converter adopts the LM2917 chip, and the charge pump output resistance end of voltage to frequency modular converter is that the 3rd pin of LM2917 is connected with adjustable resistance R
1, the charge pump timing capacitor end of voltage to frequency modular converter is that the 2nd pin of LM2917 connects capacitor C
1, the dc supply input of voltage to frequency modular converter is that the 8th pin of LM2917 connects DC power supply V
Cc, the gain constant of voltage to frequency modular converter is K;
In addition, integrating capacitor C
2With adjustable resistance R
1In parallel; DC power supply V
CcThrough divider resistance R
4, after the diode (LED) dividing potential drop, be that the 11st pin of LM2917 provides reference voltage to the inverting input of the comparator of voltage to frequency modular converter; DC power supply V
CcBy current-limiting resistance R
3To the inside of voltage to frequency modular converter voltage-stabiliser tube current limliting input is that the 9th pin of LM2917 provides stabling current; Frequency signal is the 1st pin incoming frequency voltage transformation module of LM2917 from the frequency input of frequency voltage transformation module, the voltage signal that obtains through conversion is the 5th pin output of LM2917 from voltage output end, and voltage output end is that the 5th pin of LM2917 is in series with load resistance R2; The operational amplifier negative input end 10 and the voltage output end of voltage to frequency modular converter is that the 5th of LM2917 is connected, and adopts amplifier to follow mode, reduces output impedance.
As shown in Figure 3, frequency-voltage conversion circuit also comprises optical coupling isolation circuit, the sensor frequency signal input part F of voltage to frequency modular converter U4
OutBe connected with optical coupling isolation circuit; Optical coupling isolation circuit comprises optical coupler U1, DC power supply V
C1, frequency signal output carrying resistance; The sensor frequency signal is imported from the light-emitting diode of optical coupler U4, the phototriode of lumination of light emitting diode conducting, and the collector electrode of phototriode connects DC power supply V
C1, the emitter of phototriode connects frequency signal output carrying resistance, and output frequency signal is from the emitter output of phototriode.Because the high withstand voltage optocoupler that makes that photoelectricity is isolated has good isolation effect, the optocoupler outlet side does not need intrinsic safety electric source, and the optocoupler photodiode utilizes the electric current of frequency signal to get through, and does not also need intrinsic safety electric source, the fail safe that has improved this freq converting circuit.
As shown in Figure 2, the frequency adaptation controller comprises frequency shelves stepping modular converter M and stepper S, toggle switch B stirs and produces frequency shelves signal incoming frequency shelves stepping modular converter M, frequency shelves signal is through the overfrequency shelves stepping modular converter M frequency shelves number/number of steps his-and-hers watches of tabling look-up, and be converted to corresponding number of steps, number of steps after the conversion is encapsulated into the stepping control signal, and frequency shelves stepping modular converter M exports the stepping control signal to stepper S;
The sliding contact of the stepping control end control adjustable resistance R1 of stepper S is controlled adjustable resistance R1 size.
Many grades of voltage to frequency conversion idea:
Frequency-voltage conversion circuit input frequency signal size f shown in Figure 1
OutWith output voltage signal size V
oSatisfy following relation:
V
o＝V
ccf
outC
1R
1K
Under the situation that does not change voltage to frequency modular converter U4 peripheral hardware, i.e. capacitor C
1, DC power supply V
CcAnd resistance R
1When not changing, incoming frequency and output voltage are proportional, and different incoming frequencies can corresponding different output voltages; But because output voltage is subjected to DC power supply V
CcRestriction, fixing span is arranged, so under the situation that does not change peripheral hardware, circuit can only realize that frequency in the certain frequency scope is to voltage transitions.
For realize many grades in a big way frequency to voltage transitions, with resistance R
1Change into adjustable resistance, under different resistances, output voltage V
oThe scope of corresponding different incoming frequencies in fixing span realizes the voltage to frequency conversion of multi-frequency shelves.
Therefore, in same circuit, circuit is switched to the frequency-voltage conversion circuit that adapts to the different frequency shelves, will know different frequency shelves number and resistance R
1Corresponding relation, and after the frequency shelves switch, regulate the size of resistance automatically for adapting to.
When being 0-1K, 0-2K and 0-5K with transducer output frequency shelves, the voltage to frequency in this circuit is converted to example, and many grades of frequencies to the conversion conversion method step of voltage are:
1) according to the transformational relation V of frequency-voltage conversion circuit
o=V
Ccf
OutC
1R
1K has
5v＝V
ccC
1R
11K×1000
5v＝V
ccC
1R
12K×2000
5v＝V
ccC
1R
13K×5000
Wherein, V
CcThe magnitude of voltage of the DC power supply that is connected for voltage to frequency modular converter dc power supply terminal, C
1Be the capacitance of the timing capacitor of voltage to frequency modular converter charge pump timing capacitor termination, f
1To f
3Upper frequency limit value for each frequency shelves signal correspondence is f
1=1000, f
2=2000, f
3=5000; V
MaxFor frequency-voltage conversion circuit output voltage maximum, be V
Max=5v; R
11To R
13When corresponding respectively first grade to the 3rd grade frequency signal is converted to voltage signal by proportional relationship, the resistance value that adjustable resistance should Be Controlled be adjusted to; K is the gain constant of voltage to frequency modular converter
2) by 1) note R
11, R
12, R
13Value;
3) for i shelves frequency, the control step device is with adjustable resistance R
1Be adjusted to R from 0
1i(i=1...W, W=3 are frequency shelves sums), and record number of steps are stored to frequency shelves stepping modular converter in pairs with number of steps and i shelves shelves number;
5) it is right to note the class number/number of steps of all class frequencies in frequency shelves stepping modular converter;
6) frequency shelves stepping modular converter M receive frequency shelves signal obtains frequency shelves number from frequency shelves signal;
7) frequency shelves stepping modular converter M obtains these frequency shelves to count the frequency shelves number and the number of steps of correspondence right, exports the number of steps stepping control signal of packing into to stepper S;
8) stepper S regulates the stepping of adjustable resistance R1 sliding contact and moves according to the stepping control signal.
Frequency-voltage conversion circuit disclosed by the invention and many grades of voltage to frequency conversion methods are applicable to that the frequency signal of coal mine equipment is converted to voltage signal, also can be used for petrochemical industry, combustion gas etc. have requirement of explosion proof to electric equipment occasion.
The above is only for the utility model that preferably is not limited to of the present utility model, and obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (4)
1. frequency-voltage conversion circuit that is applicable to multiple sensors, it is characterized in that: comprise frequency adaptation controller and voltage to frequency modular converter, the charge pump output resistance end of voltage to frequency modular converter is connected with adjustable resistance; The frequency adaptation controller comprises frequency shelves stepping modular converter and stepper, frequency shelves signal incoming frequency shelves stepping modular converter, be converted to the stepping control signal through overfrequency shelves stepping modular converter and export stepper to, stepper stepping control end is connected with the resistance adjustment end of adjustable resistance.
2. a kind of frequency-voltage conversion circuit that is applicable to multiple sensors as claimed in claim 2 is characterized in that: adjustable resistance is a sliding contact formula adjustable resistance, and stepper stepping control end is connected with the sliding contact of adjustable resistance.
3. a kind of frequency-voltage conversion circuit that is applicable to multiple sensors as claimed in claim 2 is characterized in that: the voltage to frequency modular converter is the LM2917 chip.
4. a kind of frequency-voltage conversion circuit that is applicable to multiple sensors as claimed in claim 3 is characterized in that: the sensor frequency input of voltage to frequency modular converter is connected with optical coupling isolation circuit; Optical coupling isolation circuit comprises optical coupler, DC power supply, frequency signal output carrying resistance; Optical coupler comprises light-emitting diode and phototriode, light-emitting diode is connected with the input frequency signal end, photosensitive subtend Light-Emitting Diode illuminating part of phototriode, the collector electrode of phototriode connects DC power supply, the emitter of phototriode connects frequency signal output carrying resistance, and the frequency signal input end of voltage to frequency modular converter is connected with the emitter of phototriode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202435058U CN201742295U (en) | 2010-06-30 | 2010-06-30 | Frequency/voltage converting circuit applied to various sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202435058U CN201742295U (en) | 2010-06-30 | 2010-06-30 | Frequency/voltage converting circuit applied to various sensors |
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| Publication Number | Publication Date |
|---|---|
| CN201742295U true CN201742295U (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202435058U Expired - Fee Related CN201742295U (en) | 2010-06-30 | 2010-06-30 | Frequency/voltage converting circuit applied to various sensors |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873063A (en) * | 2010-06-30 | 2010-10-27 | 煤炭科学研究总院重庆研究院 | Frequency voltage switching circuit and multi-gear frequency voltage switching method |
-
2010
- 2010-06-30 CN CN2010202435058U patent/CN201742295U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873063A (en) * | 2010-06-30 | 2010-10-27 | 煤炭科学研究总院重庆研究院 | Frequency voltage switching circuit and multi-gear frequency voltage switching method |
| CN101873063B (en) * | 2010-06-30 | 2013-01-09 | 煤炭科学研究总院重庆研究院 | Frequency voltage switching circuit and multi-gear frequency voltage switching method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA COAL TECHNOLOGY ENGINEERING GROUP CHONGQING Free format text: FORMER NAME: CHINA COAL SCIENCE AND INDUSTRY GROUP CHONGQING RESEARCH INSTITUTE Owner name: CHINA COAL SCIENCE AND INDUSTRY GROUP CHONGQING RE Free format text: FORMER NAME: COAL SCIENTIFIC RESEARCH INSTITUTE CHONGQING INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee after: Chongqing Research Institute of China Coal Technology & Engineering Group Corp. Address before: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee before: Chongqing Institute of Coal Science Research Institute |
|
| CP03 | Change of name, title or address |
Address after: 400039 Chongqing Jiulongpo Branch City Road No. 6 Patentee after: CCTEG CHONGQING RESEARCH INSTITUTE Co.,Ltd. Address before: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee before: Chongqing Research Institute of China Coal Technology & Engineering Group Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20160630 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |