CN104457909A - Intelligent radio frequency admittance controller - Google Patents
Intelligent radio frequency admittance controller Download PDFInfo
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- CN104457909A CN104457909A CN201410835370.7A CN201410835370A CN104457909A CN 104457909 A CN104457909 A CN 104457909A CN 201410835370 A CN201410835370 A CN 201410835370A CN 104457909 A CN104457909 A CN 104457909A
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Abstract
The invention discloses an intelligent radio frequency admittance controller. The controller comprises a main controller unit, a power unit, a probe signal processing unit, a watchdog unit, an E2PROM unit, an output expansion unit and an HMI unit. The power unit, the probe signal processing unit, the watchdog unit, the E2PROM unit, the output expansion unit and the HMI unit are connected with the main controller unit. The main controller unit feeds back a signal to a user through the output expansion unit and the HMI unit, wherein the signal is obtained through detecting and processing of the probe signal processing unit. Compared with the prior art, the intelligent radio frequency admittance controller adopts the mode of intelligent signal processing and various-feedback-signal outputting, measuring reliability is improved, debugging and maintaining are convenient for a user, the maintaining cost is lowered, and on-site problems can be effectively solved in time.
Description
Technical field
The present invention relates to a kind of radio frequency admittance material-level measure instrument of industrial automation, particularly a kind of there is self-diagnostic function, anti-bridging interference, continuous material level measure and the intelligent radio frequency admittance controller of the multi-signal way of output.
Background technology
At industrial automation, be divided into switching value instrument and continuous quantity instrument for the situ industrial instrument output signal type measuring level of filler material.
Switching value instrument revolves the instrument such as level switch for representative with radio-frequency guide-admission object-position switch, tuning fork level switch, the excellent level switch that shakes, resistance, and whether detect current instrument installed position has solid accumulation; Continuous quantity instrument with instrument such as radar levelmeter, ultrasonic material level meter, electric floating drum level meter, magnetic turnover panel level meter, magnetostriction level meters for representative, for detecting the consecutive variations situation of thing position in feed bin.
These equipment are widely used in the occasions such as chemical industry, oil, metallurgy, power plant, manufacture, and radio frequency admittance material level also has switching value instrument and continuous quantity instrument, but in these instrument under the dangerous situation easily producing blast, cannot hot line job Commissioning field instrument, particularly flameproof instrument; When instrument is measured at high charge level, user's debugging maintenance is cumbersome, needs again to climb helper; And some occasion, after instrument is installed, helper also can be removed, and brings larger trouble to field adjustable.
Usually when measuring switching value material level, convert by capacitive reactance translation circuit the material level capacitance detected to magnitude of voltage and compare generation low and high level signal with potentiometer, by controller identification, the sensitivity of this detection mode depends on the debugging of potentiometer, and potentiometer is manual debugging, debugging sensitivity is not easy again to control, in addition when there is probe bridging interference or tested material changes, and cannot auto modification sensitivity.
Therefore, a kind of intelligent radio frequency admittance controller of special needs, to solve above-mentioned existing Problems existing.
Summary of the invention
The object of the present invention is to provide a kind of radio frequency admittance controller with functions such as self-diagnostic function, anti-bridging interference, continuous material level measurement and the multi-signal way of outputs.
Technical matters solved by the invention can realize by the following technical solutions:
A kind of intelligent radio frequency admittance controller, comprises Main Control Unit, power supply unit, probe signal processing unit, watchdog unit, E2PROM unit, exports expanding element and HMI interface unit; Described power supply unit, probe signal processing unit, watchdog unit, E2PROM unit, output expanding element are connected with Main Control Unit mutually respectively with HMI interface unit; The signal that described probe signal processing unit check processing obtains by described Main Control Unit, feeds back to user through described output expanding element and HMI interface unit.
In one embodiment of the invention, described Main Control Unit is singlechip control chip, be whole instrumentation control center, for generation of measurement pumping signal and detection feedback signal, and the signal detected processed after filtering output HMI interface unit or tele-control system.
In one embodiment of the invention, described power supply unit comprises 9.5V DC Low Drift Temperature constant pressure source and 3.3V DC power supply.
In one embodiment of the invention, described probe signal processing unit comprises probe excited oscillation unit, probe failure detecting unit, capacitive reactance converter unit, variable gain converter unit and temperature compensation unit.
Above-mentioned probe excited oscillation unit is for generation of the frequency signal of measuring sonde electric capacity;
Above-mentioned probe failure detecting unit is whether Main Control Unit detection probe metering circuit can normally work;
Above-mentioned capacitive reactance converter unit is used for the capacitance signal of material level to be transformed into voltage signal;
Above-mentioned variable gain converter unit is for improving input ability, and Main Control Unit adjusts amplifier gain according to detection signal;
Said temperature compensating unit is used for compensate for electronic line temperature and drifts about the measuring error brought.
In one embodiment of the invention, described watchdog unit is an outer watchdog chip.
In one embodiment of the invention, described E2PROM unit is a support I2C interface eeprom chip.
In one embodiment of the invention, described output expanding element is a remote transfer signal output circuit part, and 4 ~ 20MA, HART, relay can be selected to start signal or PNP switching signal.
In one embodiment of the invention, described HMI interface unit comprises controller, Infrared push button, LCD liquid crystal display and driving circuit, and Infrared push button is for debugging allocating and measuring parameter, and LCD liquid crystal display is used for measurement data and relevant information.
The intelligent radio frequency admittance controller of one of the present invention, compared with prior art, adopts intelligent signal processing, the mode that various feedback signal exports, adds the reliability of measurement, and facilitates user's debugging maintenance, reduce maintenance cost, and site problems can be solved timely and effectively.
The invention solves owing to needing to readjust the problems such as sensitivity after media variations in bridging or feed bin, be arranged on feed bin eminence for radio frequency admittance controller especially and be inconvenient to safeguard occasion; And can be used for continuous material level measurement or multiple output signal mode.Radio frequency admittance controller is a kind of contact level gauge, due to the different qualities of material, so be in use easy to produce material sticks on radio frequency admittance probe, thus produces undesired signal.The present invention is a kind of based on the intelligent record interference of singlechip technology, variable gain sensitivity technique technology and E2PROM memory technology and material capacitance variations feature also comprehensive analysis material variation tendency, thus solve bridging interference, the problems such as intelligent debugging sensitivity, simplify field instrument and safeguard debugging operations, reach and be user-friendly to object.
The detailed description and obtaining that feature of the present invention can consult the graphic and following better embodiment of this case is well understood to.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
Embodiment
As shown in Figure 1, the intelligent radio frequency admittance controller 10 of one of the present invention, it comprises Main Control Unit 100, power supply unit 200, probe signal processing unit 300, watchdog unit 400, E2PROM unit 500, exports expanding element 600 and HMI interface unit 700.Described power supply unit 200, probe signal processing unit 300, watchdog unit 400, E2PROM unit 500, output expanding element 600 are all connected with Main Control Unit 100 with HMI interface unit 700.
In the present embodiment, Main Control Unit 100 is STM32F103 single-chip microcomputer (MCU) chips, and for generation of measurement pumping signal and detection feedback signal, and the signal detected processes output HMI interface unit or tele-control system after filtering.
In the present embodiment, power supply unit 200 comprises 9.5V DC Low Drift Temperature constant pressure source and 3.3V DC power supply.9.5V DC Low Drift Temperature constant pressure source utilizes precision calculating amplifier, NPN triode, Low Drift Temperature (5PPM) external dc input voltage signal to be converted to 9.5V DC Low Drift Temperature constant pressure source with reference to voltage stabilizing diode and metal film feedback resistance, and this precision voltage source is exclusively used in input; 3.3V DC power supply is 3.3V voltage stabilizing integrated chip MAX3836 and an interlock circuit, and external input power software is become 3.3V system power supply.
In the present embodiment, probe signal processing unit 300 comprises probe excited oscillation unit, probe failure detecting unit, capacitive reactance converter unit, variable gain converter unit and temperature compensation unit.
Probe excited oscillation unit is a LC electric capacity trifocal oscillatory circuit; Probe failure detecting unit is the analog switch chip 74HC4316 controlled by described Main Control Unit 100, for changing probe excited oscillation unit and capacitive reactance converter unit signal line, realizes probe circuit fault detect; The capacitive reactance that capacitive reactance converter unit is made up of operational amplifier, to the varying circuit of DC voltage, converts d. c. voltage signal to the capacitive reactance signal that oscillation circuit unit 130 exports; Variable gain converter unit is the programmable operational amplifier controlled by described Main Control Unit 100, by a string symmetrical resistance resistance and a string while action switch chip 74HC4052 form.
Main Control Unit 100 is according to signal amplitude size control break amplifier gain being detected; Temperature compensation unit forms the parameter voltages for controlling in variable gain converter unit by a thermometric chip DS1620 and 12 DAC chip MAX531, and when variation of ambient temperature is larger, temperature compensation unit can revise the parameter voltages in variable gain converter unit.
In the present embodiment, described watchdog unit 400 is a special outer watchdog chip, and when system time-out does not respond feeding-dog signal, watchdog chip will reset MCU main control unit 100.
In the present embodiment, described E2PROM unit 500 is a support I2C interface eeprom chip, for preserving the configuration information of the field instrument of current operation.
In the present embodiment, export expanding element 600 and comprise selectable 4 ~ 20MA, HART, relay beginning signal or PNP switching signal.When selection 4 ~ 20MA exports, described Main Control Unit 100 control DA chip, and produce 4 ~ 20MA signal by amplifier power supply.Described Main Control Unit 100 is connected with three control signals by two UART data lines with the HART integrated chip A5191C of apolegamy, realizes instrument and is connected with outside HART control system.Described Main Control Unit 100 can control to export two-way 5A 230VAC relay signal or two-way 10 ~ 55V PNP switching signal.
In the present embodiment, described HMI interface unit 700 comprises controller, Infrared push button, LCD liquid crystal display and driving circuit.Infrared push button comprises four buttons and receives response LED light, four infrared transceivers and infrared transceiver driving chip; LCD liquid crystal display and driver element comprise the COG lattice lcd display of serial interface and the driving chip of I2C interface; Controller is MCU control chip and interlock circuit.Controller cycle scanned infrared button, and the key assignments data detected are sent to described Main Control Unit 100 by UART communication, controller receives described Main Control Unit 100 on the other hand needs to show data, controls to be shown in LCD liquid crystal display.
The intelligent radio frequency admittance controller of one of the present invention specifically pops one's head in that self-checking function, continuous material level are measured, Infrared push button or HART data configuration and communication and various feedback mode signal output, thus meet the multiple mode of operation of user, fault self-checking function, exempt from debugging zero offset capability and be connected different external control systems, facilitate debugging maintenance instrument, after particularly installing for instrument, after installation ladder removes, again safeguard and need occasions such as again putting up a ladder, achieved by HART communication and fast and effeciently solve the objects such as site problems.
Infrared push button and HART function can allow user at dangerous occasion hot line job flameproof instrument; Continuous material level measurement function, when measuring for switching signal, when particularly measuring different materials or measure easy adhesiveness material in a storehouse, has software modification measuring basis judging point and Anti-interference Design function; Variable gain converter unit makes instrument have stronger low Jie's constant material detectability and wide capacitance detecting scope.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. an intelligent radio frequency admittance controller, is characterized in that, comprises Main Control Unit, power supply unit, probe signal processing unit, watchdog unit, E2PROM unit, exports expanding element and HMI interface unit; Described power supply unit, probe signal processing unit, watchdog unit, E2PROM unit, output expanding element are connected with Main Control Unit mutually respectively with HMI interface unit; The signal that described probe signal processing unit check processing obtains by described Main Control Unit, feeds back to user through described output expanding element and HMI interface unit.
2. a kind of intelligent radio frequency admittance controller as claimed in claim 1, it is characterized in that, described Main Control Unit is a singlechip chip, is the CCC of whole instrument.
3. a kind of intelligent radio frequency admittance controller as claimed in claim 1, is characterized in that, described power supply unit is the 9.5V DC Low Drift Temperature constant pressure source and the 3.3V circuit system power supply that become to be used for sophisticated signal detection by externally fed Power convert.
4. a kind of intelligent radio frequency admittance controller as claimed in claim 1, it is characterized in that, described probe signal processing unit comprises the probe excited oscillation unit of the frequency signal for generation of measuring sonde electric capacity, for the probe failure detecting unit whether Main Control Unit detection probe metering circuit can normally work, for the capacitance signal of material level being transformed into the capacitive reactance converter unit of voltage signal, for improving input ability, Main Control Unit is according to the detection signal adjustment variable gain converter unit of amplifier gain and the temperature compensation unit of the measuring error brought of drifting about for compensate for electronic line temperature.
5. a kind of intelligent radio frequency admittance controller as claimed in claim 1, is characterized in that, described watchdog unit is an outer watchdog chip.
6. a kind of intelligent radio frequency admittance controller as claimed in claim 1, is characterized in that, described E2PROM unit is a support I2C interface eeprom chip.
7. a kind of intelligent radio frequency admittance controller as claimed in claim 1, it is characterized in that, described output expanding element is a remote transfer signal output circuit part, and 4 ~ 20MA, HART, relay can be selected to start signal or PNP switching signal.
8. a kind of intelligent radio frequency admittance controller as claimed in claim 1, it is characterized in that, described HMI interface unit comprise controller, for debug allocating and measuring parameter Infrared push button, for the LCD liquid crystal display of measurement data and relevant information and driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410835370.7A CN104457909A (en) | 2014-12-23 | 2014-12-23 | Intelligent radio frequency admittance controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410835370.7A CN104457909A (en) | 2014-12-23 | 2014-12-23 | Intelligent radio frequency admittance controller |
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| CN104457909A true CN104457909A (en) | 2015-03-25 |
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| CN201410835370.7A Pending CN104457909A (en) | 2014-12-23 | 2014-12-23 | Intelligent radio frequency admittance controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896132A (en) * | 2018-05-08 | 2018-11-27 | 鲁东大学 | Level gauging unit and material level gauge in a kind of RF admittance level meter |
| CN108896131A (en) * | 2018-05-08 | 2018-11-27 | 鲁东大学 | Level gauging unit and material level gauge in RF admittance level meter based on temperature-compensating |
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| CN200947051Y (en) * | 2006-08-14 | 2007-09-12 | 黑龙江省中贝技术有限公司 | Flat-type digital intelligent charge level indicator |
| CN101126657A (en) * | 2006-08-14 | 2008-02-20 | 黑龙江省中贝技术有限公司 | Radio frequency admittance detecting device with self-adaptive regulation system |
| CN101210838A (en) * | 2006-12-27 | 2008-07-02 | 德菲电气（北京）有限公司 | Four-wire radio frequency admittance level gauge and material level meter and its method |
| CN201373763Y (en) * | 2009-01-22 | 2009-12-30 | 黑龙江省中贝技术有限公司 | Self-adjusting site perceiving intelligent level gage |
| EP2618117A1 (en) * | 2012-01-18 | 2013-07-24 | Finetek Co., Ltd. | Sensing device for detecting material depth, liquid-level, and temperature |
| CN204269190U (en) * | 2014-12-23 | 2015-04-15 | 上海雄风自控工程有限公司 | A kind of intelligent radio frequency admittance controller |
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2014
- 2014-12-23 CN CN201410835370.7A patent/CN104457909A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200947051Y (en) * | 2006-08-14 | 2007-09-12 | 黑龙江省中贝技术有限公司 | Flat-type digital intelligent charge level indicator |
| CN101126657A (en) * | 2006-08-14 | 2008-02-20 | 黑龙江省中贝技术有限公司 | Radio frequency admittance detecting device with self-adaptive regulation system |
| CN101210838A (en) * | 2006-12-27 | 2008-07-02 | 德菲电气（北京）有限公司 | Four-wire radio frequency admittance level gauge and material level meter and its method |
| CN201373763Y (en) * | 2009-01-22 | 2009-12-30 | 黑龙江省中贝技术有限公司 | Self-adjusting site perceiving intelligent level gage |
| EP2618117A1 (en) * | 2012-01-18 | 2013-07-24 | Finetek Co., Ltd. | Sensing device for detecting material depth, liquid-level, and temperature |
| CN204269190U (en) * | 2014-12-23 | 2015-04-15 | 上海雄风自控工程有限公司 | A kind of intelligent radio frequency admittance controller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896132A (en) * | 2018-05-08 | 2018-11-27 | 鲁东大学 | Level gauging unit and material level gauge in a kind of RF admittance level meter |
| CN108896131A (en) * | 2018-05-08 | 2018-11-27 | 鲁东大学 | Level gauging unit and material level gauge in RF admittance level meter based on temperature-compensating |
| CN108896131B (en) * | 2018-05-08 | 2019-11-26 | 鲁东大学 | Level gauging unit and material level gauge in RF admittance level meter based on temperature-compensating |
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Application publication date: 20150325 |