CN111141203A - Icing warning box based on frequency difference circuit - Google Patents
Icing warning box based on frequency difference circuit Download PDFInfo
- Publication number
- CN111141203A CN111141203A CN201911248482.1A CN201911248482A CN111141203A CN 111141203 A CN111141203 A CN 111141203A CN 201911248482 A CN201911248482 A CN 201911248482A CN 111141203 A CN111141203 A CN 111141203A
- Authority
- CN
- China
- Prior art keywords
- frequency
- icing
- signal
- frequency difference
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
- G08B19/02—Alarm responsive to formation or anticipated formation of ice
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention belongs to the technical field of electronic circuits, and relates to an icing warning box based on a frequency difference circuit. The device is mainly used for being matched with an icing probe for use and used for judging whether the airplane is iced. And sending an icing warning signal and a vibrating head heating signal when icing. Compared with the traditional warning box, the warning box does not use a single chip microcomputer, and a 555 timer is adopted to generate a time sequence signal. The characteristics of the frequency-voltage conversion chip LM2907 are utilized to convert the frequency difference signal into a voltage signal, and the control of 'good', 'icing', 'vibration head heating' signals is completed. The circuit has the characteristics of simple structure, good circuit consistency, strong anti-interference capability and the like.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and relates to an icing warning box based on a frequency difference circuit.
Background
How to frequency discriminate the alarm box, that is, how to judge whether the thickness of the ice layer on the icing probe reaches the alarm thickness is a key technology which must be solved in the design process of the alarm box. If the measurement and control software is put into the alarm box, the problems of difficult navigability and evidence obtaining, high evidence obtaining cost and the like are often faced, so that it is necessary to develop an alarm box which can complete frequency discrimination and instruction delay completely through a hardware circuit.
Disclosure of Invention
The purpose of the invention is: the frequency signal resolving device depends on a hardware circuit and can realize the control of an icing alarm signal.
The technical scheme of the invention is as follows: the utility model provides an icing alarm box based on frequency difference circuit which characterized in that: the circuit comprises an alternating current amplifier circuit board, a frequency signal circuit board and a power supply driving circuit board; the power supply driving circuit board completes voltage conversion and provides voltage for the alternating current amplifying circuit board and the frequency signal processing circuit board, the alternating current amplifying circuit board and the electromagnetic oscillation coil in the icing probe form a closed-loop oscillation system, when the system reaches a steady state, a fixed frequency can be generated, and the fixed frequency can be increased along with the increase of the thickness of ice formed by the icing probe.
The frequency signal circuit board is used for converting a frequency signal generated by the icing probe into a voltage signal.
The frequency signal circuit board comprises a frequency difference circuit module, a frequency-voltage conversion module and a timing module, wherein the frequency difference circuit module carries out frequency difference processing on the frequency detected by the icing probe and a reference frequency to obtain a frequency difference signal, the obtained frequency difference signal is converted into a voltage signal through the frequency-voltage conversion module, and the voltages output by different frequency conversions are different, so that instructions of 'good signals', 'icing signals' and 'vibration head heating signals' are controlled; the timing module defines a heating time of the icing probe.
The frequency difference circuit module is a subtraction circuit.
The frequency-voltage conversion module adopts a frequency-voltage conversion chip LM2907, and the working linear interval of the LM2907 chip is 70 Hz-300 Hz.
The icing signal and the good signal are grounding signals.
The icing probe heating signal is a voltage signal.
The timing circuit adopts a 555 timer, and the duration time of the heating signal of the vibrating head is (8 +/-2) s.
When the frequency generated by the icing probe is greater than the identification frequency point, the 4 pins of the N12 can be changed from high level to low level, and the 555 timer N14 is triggered by a falling edge, so that 8s timing is realized.
The invention has the advantages and beneficial effects that: the invention has the characteristics that the pure analog circuit is adopted to replace a singlechip to solve the analog signal output by the icing probe, thereby greatly simplifying the complicated design and development process of software products, saving the development cost and being more beneficial to the airworthiness evidence obtaining of the products after being installed in the airplane.
Drawings
FIG. 1 is a cross-linking diagram of the system of the present invention
FIG. 2 is a circuit diagram of frequency difference
Fig. 3 is a circuit diagram of frequency-to-voltage conversion of an icing warning box.
Fig. 4 is a diagram of an 8s timing circuit for an icing warning box.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, an icing alarm box based on a frequency difference circuit comprises an alternating current amplifier circuit board, a frequency signal circuit board and a power supply driving circuit board; the power supply driving circuit board completes voltage conversion and provides voltage for the alternating current amplifying circuit board and the frequency signal processing circuit board, the alternating current amplifying circuit board and the electromagnetic oscillation coil in the icing probe form a closed-loop oscillation system, when the system reaches a steady state, a fixed frequency can be generated, and the fixed frequency can be increased along with the increase of the thickness of ice formed by the icing probe.
As shown in fig. 2-4, the frequency signal circuit board includes a frequency difference circuit module, a frequency-voltage conversion module and a timing module, the frequency difference circuit module performs frequency difference processing on the frequency detected by the icing probe and a reference frequency to obtain a frequency difference signal, the obtained frequency difference signal is converted into a voltage signal by the frequency-voltage conversion module, and the voltages converted and output by different frequencies are different, so as to control the instructions of "good signal", "icing signal" and "vibration head heating signal"; the timing module defines a heating time of the icing probe.
The icing warning box is used in cooperation with the GJB-X icing probe, the alternating current amplification circuit board and the electromagnetic oscillation coil in the icing probe form a closed-loop oscillation system, wherein the GJB-X is a film icing probe, and when the surface of the icing probe is iced, the influence of rigidity on frequency is greater than the influence of weight on frequency, so that the frequency generated by the oscillation system is increased along with the increase of the thickness of an ice layer.
The frequency signal circuit board mainly functions to convert frequency signals generated by the probe into voltage signals, so a frequency-voltage conversion chip LM2907 is selected, the linear range of the working of the LM2907 chip is 70 Hz-300 Hz, a subtraction circuit is adopted to meet the requirements of the chip, a frequency difference signal is obtained by subtracting the frequency generated by the icing probe from the reference frequency, and the frequency difference signal is shown in figure 2. The frequency difference signal is converted into frequency conversion voltage through the LM2907 chip conversion circuit, which is shown in figure 3.
The icing signal and the good signal are grounding signals, the icing probe heating signal is a voltage signal, and the signals are controlled by the difference of voltages output by different frequency conversion.
The 'vibrating head heating' signal lasts (8 +/-2) s, an 8s timing circuit is shown in figure 4, a 555 timer is adopted, when the frequency generated by the icing probe is greater than the identification frequency point, the 4 pins of the N12 are changed from high level to low level, and the 555 timer N14 is triggered by a falling edge, so that 8s timing is realized.
Claims (9)
1. The utility model provides an icing alarm box based on frequency difference circuit which characterized in that: the circuit comprises an alternating current amplifier circuit board, a frequency signal circuit board and a power supply driving circuit board; the power supply driving circuit board completes voltage conversion and provides voltage for the alternating current amplifying circuit board and the frequency signal processing circuit board, the alternating current amplifying circuit board and the electromagnetic oscillation coil in the icing probe form a closed-loop oscillation system, when the system reaches a steady state, a fixed frequency can be generated, and the fixed frequency can be increased along with the increase of the thickness of ice formed by the icing probe.
2. The frequency difference circuit based icing warning box of claim 1, wherein: the frequency signal circuit board is used for converting a frequency signal generated by the icing probe into a voltage signal.
3. The frequency difference circuit based icing warning box of claim 1, wherein: the frequency signal circuit board comprises a frequency difference circuit module, a frequency-voltage conversion module and a timing module, wherein the frequency difference circuit module carries out frequency difference processing on the frequency detected by the icing probe and a reference frequency to obtain a frequency difference signal, the obtained frequency difference signal is converted into a voltage signal through the frequency-voltage conversion module, and the voltages output by different frequency conversions are different, so that instructions of 'good signals', 'icing signals' and 'vibration head heating signals' are controlled; the timing module defines a heating time of the icing probe.
4. The frequency difference circuit based icing alarm box of claim 3, wherein: the frequency difference circuit module is a subtraction circuit.
5. The frequency difference circuit based icing alarm box of claim 3, wherein: the frequency-voltage conversion module adopts a frequency-voltage conversion chip LM2907, and the working linear interval of the LM2907 chip is 70 Hz-300 Hz.
6. The frequency difference circuit based icing alarm box of claim 3, wherein: the icing signal and the good signal are grounding signals.
7. The frequency difference circuit based icing warning box of claim 1, wherein: the icing probe heating signal is a voltage signal.
8. The frequency difference circuit based icing alarm box of claim 3, wherein: the timing circuit adopts a 555 timer, and the duration time of the heating signal of the vibrating head is (8 +/-2) s.
9. The frequency difference circuit based icing warning box of claim 1, wherein: when the frequency generated by the icing probe is greater than the identification frequency point, the 4 pins of the N12 can be changed from high level to low level, and the 555 timer N14 is triggered by a falling edge, so that 8s timing is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248482.1A CN111141203A (en) | 2019-12-06 | 2019-12-06 | Icing warning box based on frequency difference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248482.1A CN111141203A (en) | 2019-12-06 | 2019-12-06 | Icing warning box based on frequency difference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111141203A true CN111141203A (en) | 2020-05-12 |
Family
ID=70518037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911248482.1A Pending CN111141203A (en) | 2019-12-06 | 2019-12-06 | Icing warning box based on frequency difference circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111141203A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015061557A1 (en) * | 2013-10-24 | 2015-04-30 | The Regents Of The University Of Michigan | Aircraft icing detector |
| CN105571478A (en) * | 2015-12-24 | 2016-05-11 | 太原航空仪表有限公司 | Piezoelectric vibration cylinder icing sensor and method for measuring icing condition thereof |
| CN105857621A (en) * | 2016-05-06 | 2016-08-17 | 武汉航空仪表有限责任公司 | Integrated ice detector |
| CN107248258A (en) * | 2017-07-28 | 2017-10-13 | 湖北国创高新材料股份有限公司 | A kind of icy road safety early warning device and method for early warning |
| CN109436338A (en) * | 2018-10-31 | 2019-03-08 | 浙江清华柔性电子技术研究院 | De-icing device and anti-deicing control method based on the device |
-
2019
- 2019-12-06 CN CN201911248482.1A patent/CN111141203A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015061557A1 (en) * | 2013-10-24 | 2015-04-30 | The Regents Of The University Of Michigan | Aircraft icing detector |
| CN105571478A (en) * | 2015-12-24 | 2016-05-11 | 太原航空仪表有限公司 | Piezoelectric vibration cylinder icing sensor and method for measuring icing condition thereof |
| CN105857621A (en) * | 2016-05-06 | 2016-08-17 | 武汉航空仪表有限责任公司 | Integrated ice detector |
| CN107248258A (en) * | 2017-07-28 | 2017-10-13 | 湖北国创高新材料股份有限公司 | A kind of icy road safety early warning device and method for early warning |
| CN109436338A (en) * | 2018-10-31 | 2019-03-08 | 浙江清华柔性电子技术研究院 | De-icing device and anti-deicing control method based on the device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205899013U (en) | X wave band radar installations based on all solid state coherent technical development | |
| CN103475343B (en) | A kind of small-signal is anti-interference, amplify and the low-power consumption treatment method of shaping | |
| CN103822702A (en) | Pulse signal conversion device for acquiring and synchronously triggering sound field measured data of ultrasonic phased array energy converter | |
| CN203299264U (en) | Overvoltage on-line monitor system | |
| CN111141203A (en) | Icing warning box based on frequency difference circuit | |
| CN203929215U (en) | A kind of power capacitor vibration on-line monitoring device | |
| CN203798466U (en) | Operating temperature measuring device based on surface acoustic wave for conductor connection point in switch cabinet | |
| CN201477185U (en) | Tester for an electronic plastic shell breaker | |
| CN205176206U (en) | Frequency conversion series resonance ac voltage withstand test test device | |
| CN201662481U (en) | Detection device used for anti-skid control component | |
| CN203216604U (en) | A wind generator blade vibration state detection system | |
| CN205210277U (en) | A aeroengine data acquisition device of taking a trial run | |
| CN203930513U (en) | A kind of satellite-signal autotracking unit | |
| CN209513928U (en) | Portable high-pressure equipment fault positioning device | |
| CN102103171A (en) | Detection device for antiskid control component | |
| CN103558561B (en) | Aircraft engine N2 rotating speed analogue means | |
| CN204007497U (en) | The magnetostrictive displacement sensor of isolation pulse generating circuit | |
| CN215449588U (en) | Ultrasonic human body induction equipment | |
| CN203785784U (en) | Portable and online monitoring dual-purpose intelligent electronic device used for transformer vibration | |
| CN104089568A (en) | Magnetostriction displacement sensor for isolation pulse generation circuit | |
| CN2486978Y (en) | Alarm for nearing electrisity | |
| CN111472945A (en) | Wind-powered electricity generation field icing monitoring and early warning device based on electromagnetic resonance principle | |
| CN206226343U (en) | A kind of new driving structure for being applied to control electric operator motor | |
| CN209559981U (en) | One kind being used for intensity of lightning zoning monitoring device | |
| CN203178350U (en) | Overvoltage on-line monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200512 |