CN200972166Y - Water boiling detector for electromagnetic stove - Google Patents
Water boiling detector for electromagnetic stove Download PDFInfo
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- CN200972166Y CN200972166Y CN 200620015739 CN200620015739U CN200972166Y CN 200972166 Y CN200972166 Y CN 200972166Y CN 200620015739 CN200620015739 CN 200620015739 CN 200620015739 U CN200620015739 U CN 200620015739U CN 200972166 Y CN200972166 Y CN 200972166Y
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- electromagnetic stove
- water boiling
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- boiling
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Abstract
The utility model discloses a water boiling detector of the induction cooker, which is composed of an MCU, a vibration sensor applied to transmit the machine vibration signal incurred when the water drop gasifies into electrical signal is attached on the outer shell of the induction cooker, and one end of which is connected with the output of the amplifier which is connected with the inlet of the MCU, The MCU chooses and transmits frequency representing water boiling into the controlling signal and outputs through the A/D transformation and filtration. The water boiling detector of the induction cooker is utilized the principle of singing water is not boiling; boiling water is not singing, through detecting the vibration in the procedure of heating up the water, the water whether is boiled or not is judged. The utility model has a simple structure and a low cost, and can be applied to the water boiling detector of the induction cooker, and the whether is boiled or not can be judged accurately.
Description
Technical field
The utility model relates to water boiling detection technique, particularly a kind of water boiling automatic detection device that is used for electromagnetic stove.
Background technology
Electromagnetic stove is heated up water, and to open that (boiling) detect be puzzlement designer's a difficult problem to water always, as the electronic product that adopts digital technology control, the consumer all wish very much electromagnetic stove to heat up water, Baoshang can accomplish to seethe with excitement and detect automatically and carry out power control.But things turn out contrary to one's wishes, this problem never is well solved, this is because the sensor of electromagnetic stove internal measurement temperature is enclosed in the middle of the casing, (be called for short down: ceramic wafer) across a micro-crystalline ceramic plate with the vessel that are filled with water, ceramic wafer is the non-conductor of temperature, variations in temperature that temperature sensor below ceramic wafer is felt and the variations in temperature of burning the reality in the vessel be filled with water above the ceramic wafer differ greatly, and therefore are difficult to adopt the method for inside temperature measurement to judge that the water of heating up water opens the situation of (boiling).
Water is opened automatic detection can make things convenient for the user greatly, so people have thought a lot of methods in order to address this problem, but basic principle all is one, promptly adopts the method for temperature detection, and specific practice has following several:
1. adopt reasonable algorithm, whether for example calculate boiling that the temperature variation curve of heating up water judges water, because the sensor of electromagnetic stove internal measurement temperature and the vessel that are filled with water are across a ceramic wafer, internal temperature sensor also can be subjected to the interference that the internal components heating causes in addition, and below the ceramic wafer with the problems such as sluggishness of last surface temperature, so never success of this method.
2. use mechanical mode, temperature sensor is extracted, directly touch the method for aquamanile, this method is because relate to electromagnetic stove water-impervious problem and sensor and circuit Insulation Problems etc., and cost is too high, also fails.
3. adopt far infrared contactless temperature-measuring technology, this method is because the far infrared of frame for movement difficult design and different vessel has different problems such as wavelength shift interference, and this method is not handy yet.
4. adopt vessel indoor design temperature measurement circuit in addition, detect the boiling situation of heating up water with the mode that is wirelessly sent to main circuit then, therefore this method also belong to failure because too impracticable.
In fact,, also will relate to degree of purity of atmospheric pressure, water or the like here, so the method itself that thermometric is declared the water boiling also there is inadequate natural endowment, so said method is difficult to succeed because the temperature of the boiling of water and water neither concern definitely accordingly.
Summary of the invention
The purpose of this utility model provides a kind of water boiling checkout gear that is used for electromagnetic stove, and whether the water that this device can detect in the electromagnetic stove upper heater ware automatically seethes with excitement.
Water is heated to the process of boiling in vessel, be the liquid process that progressively turns to steam state, and water constantly has the water droplet of close heating source to be vaporized in the process of heating, the rising of ducking in drink of formation gas, and bubble breaks and vibrates when rising to the water surface.Usually in the process of heating up water, there were many little water droplets to be vaporized before this, and formed vesicle and rise, break.Begin when boiled at water, a large amount of water droplets are vaporized, and form air pocket and rise, break, be exactly the boiling phenomenon that we see.The formation of these bubbles, rising and breaking all can cause vibration, and these vibrations have certain rule, and the rule of these vibrations simultaneously can be surveyed.As long as detect the situation of change that water vaporizing liquid in heating process produces the bubble size, and energy measurement is to the vibration situation of the water bubble that the vaporization generation is bigger when the boiling, and the water outlet that just can judge rightly is by whether boiled.
To achieve these goals, the mechanical oscillation signal that the water boiling checkout gear that the utility model is used for electromagnetic stove comprises MCU, produce when being used for water drops vaporize converts the vibrating sensor and the amplifier of the signal of telecommunication to, described vibrating sensor is close on the shell of electromagnetic stove, its output is received described amplifier input terminal, amplifier out connects the input of MCU, described MCU is with input signal process A/D conversion, filtering, select to represent the frequency signal of water boiling, convert control signal output to.
Vibrating sensor can adopt piezoelectric ceramic piece.
Originally the principle that is used for the water boiling checkout gear utilization " Xiangshui County does not open, boiling water do not ring " of electromagnetic stove is judged whether water is boiled and is risen by detect oscillation phenomenon that water takes place in temperature-rise period.Whether it is simple in structure, cost is low, be applied to electromagnetic stove and can detect water accurately and timely and boiled and rise.
Description of drawings
Fig. 1 is the theory diagram that originally is used for the water boiling checkout gear of electromagnetic stove;
Fig. 2 is its circuit diagram;
Fig. 3 is the scheme of installation of its vibrating sensor on electromagnetic stove.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
As shown in Figure 1, originally the mechanical energy that the water boiling checkout gear that is used for electromagnetic stove comprises MCU 30, produce when being used for water drops vaporize converts the vibrating sensor 10 and the amplifier 20 of electric energy to, described vibrating sensor 10 is close on the shell of electromagnetic stove, its output is received the input of described amplifier 20, the input of amplifier 20 output termination MCU 30, described MCU 30 is with input signal process A/D conversion, filtering, select to represent the frequency signal of water boiling, convert control signal output to.
Fig. 2 is the circuit diagram of this checkout gear.With reference to Fig. 2, amplifier 20 adopts audio-frequency amplifiers, and the vibration signal in the process of heating up water that vibrating sensor 10 is collected amplifies.Described audio-frequency amplifier 20 comprises three triode Q1, Q2 and Q3, the grounded emitter of the first triode Q1, colelctor electrode connects the base stage of the second triode Q2 by coupling capacitance C6, the grounded emitter of the second triode Q2, colelctor electrode connects the base stage of the 3rd triode Q3 by resistance R 8, the 3rd triode Q3 emitter stage connects power supply, and its colelctor electrode meets potentiometer VR1 to output.Vibrating sensor 10 can adopt piezoelectric ceramic piece P1, and the integrating circuit that vibrating sensor 10 is formed by resistance R 3 and capacitor C 2 is connected with the audio-frequency amplifier input.U1 is a high speed MCU, it is responsible for the analog-to-digital conversion of signal, digital filtering is handled and signal characteristic is handled and water is opened the boiling judgement, it also is responsible for communicating by letter with host computer simultaneously, accept the start detection order of host computer and open information to host computer report water, 4 pin of U1 are input, are connected with the audio-frequency amplifier output, and 5 pin of U1 are output.
In the present embodiment, adopt the PCM (Pulse Code Modulation) of 64K to carry out analog-to-digital conversion, become special digital signal to supply analyzing and processing the analog passband signal extra pulse coded modulation circuit conversion that collects.Signal needs to carry out filtering processing, feature amplification processing and similitude judgment processing in MCU after gathering, processing method is as follows:
Filtering is handled: in the MCU programming, in order to remove interference, used multistage digital filtering mode, will notice that in filtering filtering can not too increase the distortion factor of signal, wherein anti-impulse disturbances has adopted multistage moving average to count computing method.Knock interference in order to reduce the external world, adopted the low-pass digital filter method, its computing formula is as follows:
Y0＝aX+(1-a)Y1
In the formula: X is this sampled value, and Y1 is the last computation output valve, and Y0 calculates output valve for this.A is more little for coefficient, and the cut-off frequency of wave filter is high more.Usually we to get a be 2 negative power power, like this when calculating aX, as long as X some positions that move right.In addition, can be converted to the formula of front during Practical Calculation: Y0=aX+ (1-a) Y1=a (X-Y1)+Y1 is to make things convenient for the programming of MCU.
Feature is amplified: reduce because the signal characteristic of boiling water boiling is a frequency, dynamics increases, but this signal progressively forms, and variable quantity is also smaller, therefore in time boiling signal extraction be come out, need amplify this characteristic signal, characteristic signal amplifies employing digital frequency-selecting mode, obviously to be different from other interference noise signal.
Similitude fuzzy Judgment: when water approaches to seethe with excitement, characteristic signal is more and more obvious, we carry out the fuzzy Judgment of similitude, to different water (for example: full Hu Shui, smaller part Hu Shui, all cold water, part cold water, the water that begins to burn from cold water and opened but cool slightly a little while water and different container or the like) adopt different similar probability calculations, thereby reach the purpose of correct judgement.
With reference to Fig. 3, piezoelectric ceramic piece adopts diameter greater than 10 millimeters piezoelectric ceramic piece, be close on the shell 1 of electromagnetic stove suitable position with glue and fix, the vaporization vibration of gathering water in the heating process changes and converts the signal of telecommunication then to, is welded with the lead 3 of drawing the signal of telecommunication on the piezoelectric ceramic piece 10.The vibration signal that piezoelectric ceramic piece 10 will be heated up water in the process converts the signal of telecommunication to, give circuit part 4 by lead 3 conduction, at circuit part, signal is through amplifying and digital processing, after determining the water boiling, control through the host computer 6 that communication line 5 passes to electromagnetic stove with the signal of telecommunication.During assembling, require vibrating sensor 10 to be close to the shell 1 of electromagnetic stove comprehensively, air gap do not arranged on the plane, be attached to loam cake or lower casing all can, but should be as far as possible away from mechanical oscillation interference sources such as electric fans.
The place that this water boiling checkout gear can be applied in electromagnetic stove and be inconvenient to adopt temperature detection, determine after water is opened can power cutoff when main control chip, controls the process of the Baoshang of heating up water.
Claims (5)
1, a kind of water boiling checkout gear that is used for electromagnetic stove, it is characterized in that: the mechanical oscillation signal that comprise MCU, produces when being used for water drops vaporize converts the vibrating sensor and the amplifier of the signal of telecommunication to, described vibrating sensor is close on the shell of electromagnetic stove, its output is received described amplifier input terminal, amplifier out connects the input of MCU, described MCU through A/D conversion, filtering, selects to represent the frequency signal of water boiling with input signal, converts control signal output to.
2, the water boiling checkout gear that is used for electromagnetic stove according to claim 1, it is characterized in that: described vibrating sensor adopts piezoelectric ceramic piece.
3, the water boiling checkout gear that is used for electromagnetic stove according to claim 1, it is characterized in that: described amplifier adopts audio-frequency amplifier.
4, the water boiling checkout gear that is used for electromagnetic stove according to claim 3, it is characterized in that: described audio-frequency amplifier comprises three triodes, the grounded emitter of first triode, colelctor electrode connects the base stage of second triode by coupling capacitance, the grounded emitter of second triode, colelctor electrode connects the base stage of the 3rd triode by resistance, and the 3rd transistor emitter connects power supply, and its colelctor electrode connects potentiometer to output.
5, the water boiling checkout gear that is used for electromagnetic stove according to claim 4, it is characterized in that: described vibrating sensor output is connected with the audio-frequency amplifier input by integrating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015739 CN200972166Y (en) | 2006-11-13 | 2006-11-13 | Water boiling detector for electromagnetic stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015739 CN200972166Y (en) | 2006-11-13 | 2006-11-13 | Water boiling detector for electromagnetic stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200972166Y true CN200972166Y (en) | 2007-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620015739 Expired - Fee Related CN200972166Y (en) | 2006-11-13 | 2006-11-13 | Water boiling detector for electromagnetic stove |
Country Status (1)
| Country | Link |
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| CN (1) | CN200972166Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999060A (en) * | 2012-05-13 | 2013-03-27 | 李祥龙 | Method and circuit for controlling automatic heating stop of water boiling induction cooker after boiling |
| CN104279587A (en) * | 2013-07-11 | 2015-01-14 | 美的集团股份有限公司 | Control method of intelligent cloud convection heating and electromagnetic heating device |
| CN106287853A (en) * | 2016-08-29 | 2017-01-04 | 浙江绍兴苏泊尔生活电器有限公司 | Induction cooker and induction cooker control method |
| CN107421126A (en) * | 2016-05-24 | 2017-12-01 | 林增辉 | It is a kind of it is contactless can automatic detection water boiling state heater and control method |
| CN108618605A (en) * | 2017-03-21 | 2018-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulating pot |
| CN111358294A (en) * | 2020-04-17 | 2020-07-03 | 佛山职业技术学院 | Control method of electric kettle, electric kettle and storage medium |
-
2006
- 2006-11-13 CN CN 200620015739 patent/CN200972166Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999060A (en) * | 2012-05-13 | 2013-03-27 | 李祥龙 | Method and circuit for controlling automatic heating stop of water boiling induction cooker after boiling |
| CN104279587A (en) * | 2013-07-11 | 2015-01-14 | 美的集团股份有限公司 | Control method of intelligent cloud convection heating and electromagnetic heating device |
| CN107421126A (en) * | 2016-05-24 | 2017-12-01 | 林增辉 | It is a kind of it is contactless can automatic detection water boiling state heater and control method |
| CN106287853A (en) * | 2016-08-29 | 2017-01-04 | 浙江绍兴苏泊尔生活电器有限公司 | Induction cooker and induction cooker control method |
| CN108618605A (en) * | 2017-03-21 | 2018-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulating pot |
| CN111358294A (en) * | 2020-04-17 | 2020-07-03 | 佛山职业技术学院 | Control method of electric kettle, electric kettle and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071107 Termination date: 20091214 |