CN102128677B - Water boiling detection device for electromagnetic oven - Google Patents
Water boiling detection device for electromagnetic oven Download PDFInfo
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- CN102128677B CN102128677B CN 201010607284 CN201010607284A CN102128677B CN 102128677 B CN102128677 B CN 102128677B CN 201010607284 CN201010607284 CN 201010607284 CN 201010607284 A CN201010607284 A CN 201010607284A CN 102128677 B CN102128677 B CN 102128677B
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Abstract
The invention discloses a water boiling detection device for an electromagnetic oven. The device comprises an acoustic sensor and an acoustic amplification circuit, wherein the acoustic sensor is electrically connected with the acoustic amplification circuit, and is electrically connected with a singlechip through the acoustic amplification circuit; an electromagnetic heat control circuit is arranged in the singlechip, and receives sound of water boiling through the acoustic sensor. The device not only can detect water boiling, but also can be automatically shut down, and can accurately determine whether the water is boiled or not and is not affected by background noise. The device has a simple circuit structure, and the sound error is in 15 seconds.
Description
Technical field
The present invention relates to a kind of electromagnetic oven method for burning water, the water Fei that in details of the words relates to a kind of electromagnetic oven rises Jian Ce Installed and puts, and by specified sound intensity value is set in single-chip microcomputer, utilizes the lasting intensity of water when boiling sound and controls the on off state of electromagnetic oven.
Background technology
Electromagnetic oven has instant thermal characteristics and by popular widespread use, and it is applied to industrial high warm melting has good heating effect without the fire aspect such as cook on plastics, the household.
The patent No. is: 94244165.6 disclose a kind of vibration testing type water boiling tester, when its boiler water container boils water, utilize the water caused vibration principle that seethes with excitement to pass to vibration sensitive element, convert electric signal to by vibration sensitive element, this signal amplifies, confirms to process through circuit, become sound signal, send alerting signal by loudspeaker again.The patent No. is: 200720055611.1 disclose a kind of boiled water sensor, it comprises closure, be arranged on the piezoelectric effect potsherd in the closure, contact saddle weight with piezoelectric ceramic piece one side wherein, the inner of two output signal lines is welded in respectively on the galactic pole of piezoelectric effect potsherd and the copper coin and leads to outside the closure, wherein said saddle weight is positioned at copper coin one side of piezoelectric effect potsherd, is mainly used in the input of water boiling when heating up water.Yet, take a broad view of this two technology, all mainly be that the vibration according to water body detects.When the vibration of water body changes, just directly affect the energising situation of body.
In addition, the electromagnetic oven that has is provided with temperature sensor at boiler face, detect the water temperature in the pan, but exist error larger, temperature causes easy the to be malfunctioning phenomenon of sensor too lastingly, make the automatic effects that boils water very poor, or the not boiled i.e. shutdown of water occurs, or be exactly the phenomenon of always not shutting down.
Summary of the invention
For addressing the above problem, the present invention is the pick-up unit for a kind of water boiling, and the sound intensity effect that its fundamental purpose produces when being to utilize the water boiling when the described sound intensity reaches predetermined decibel value, can be closed the "on" position of electromagnetic oven.
Therefore the present invention includes sound transducer and sound amplifying circuit module, form in conjunction with the Electromagnetic Heating control circuit that arranges in the single-chip microcomputer, by the boiling degree of the received sound detection water of described sound transducer.
Add the audio frequency detection circuit in the controlling circuit of electromagnetic furnace that uses one-chip computer to control, by the sound in the particular range frequency is amplified, output high-low level or pulse, and send single-chip microcomputer to are processed signal and are judged to determine whether boiled boiling of water by single-chip microcomputer.
Wherein, the signal when audio signal is by the background sound and water heating during electromagnetic oven work is formed by stacking, and the described background sound is by fan, the vibration pot sound that Electromagnetic Heating produces etc.
In addition, the useful signal that the bubble that produces during the water heating breaks, its separation control circuit mainly consist of (for adjustable resistance) by the signal intensity regulating circuit.
Background sound signal intensity can be regarded as constant volume, useful signal intensity is very little when just beginning to heat, make mixed signal intensity much smaller than the signal intensity of circuit operation (output switching activity) by adjusting, background signal just can not make circuit operation like this, is equivalent to separate, along with the rising of temperature, water heating signal (useful signal) strength increase, be increased to certain value, make circuit operation, output switching activity.
Wherein, described sound amplifying circuit module includes pre-amplification circuit, frequency selective network, the signal intensity regulating circuit, amplifying circuit and waveform output circuit, wherein, be electrically connected pre-amplification circuit by described sound transducer, described pre-amplification circuit is the electrical connection frequency selective network, described frequency selective network is electrically connected described amplifying circuit, described amplifying circuit electrical connection signal intensity regulating circuit, described signal intensity regulating circuit is electrically connected described waveform output circuit, and the output port that is provided with by described waveform output circuit is electrically connected the input port that described single-chip microcomputer is provided with.
Described waveform output circuit is provided with the first resistance and the first triode, wherein, the first triode is the NPN pipe, and the first resistance is electrically connected the base stage of the first triode, this moment, the collector of the first triode was electrically connected the second resistance, and being electrically connected the signal input part of the signal output part electrical connection single-chip microcomputer of extending out between the second resistance in the collector of this first triode, the signal that this signal output part is exported is low level signal.
Be provided with the base stage that the first resistance is electrically connected the first triode in the described waveform output circuit, and an end of the second resistance is electrically connected the collector of the first triode, the collector of described the first triode be connected in parallel the second resistance and the 4th resistance, the second resistance is connected in series an end of the 3rd resistance, the other end of the 3rd resistance is electrically connected the collector of the second triode, described the 4th resistance is electrically connected the base stage of described the second triode, described the first triode and the second triode are to be the NPN pipe, the signal output part of therefore extending out between the collector of the 3rd resistance and the second triode is the signal input part of electrical connection single-chip microcomputer, and the output signal of described signal output part is high level signal.
In addition, described sound transducer is installed on the electromagnetic stove outer housing lower surface apart from ceramic wafer the most nearby.
Further, sound amplifying circuit resume module signal is high-low level or pulse signal, by the Circuit tuning parameter, be that 70 sound when spending are maximum in water temperature, the level upset, and it is above as first identification signal to continue for 8 seconds, sound variation when described single-chip microcomputer seethes with excitement when water, again upset, namely be judged as boiling after counting down to n pulse this moment.
Beneficial effect of the present invention is that it can not only detect water boiling, and can also automatic shutdown, is not subjected to the impact of ground unrest in accurately judging the process whether water seethes with excitement, and its circuit structure is simple, and sound error is within 15 seconds.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the scheme of installation of sound transducer of the present invention.
Fig. 3 is the first preferred embodiment synoptic diagram of sound amplifying circuit module of the present invention.
Fig. 3 a is the low level synoptic diagram of Fig. 3.
Fig. 4 is the second preferred embodiment synoptic diagram of sound amplifying circuit module of the present invention.
Fig. 4 a is the synoptic diagram of Fig. 4 high level.
Embodiment
See also shown in Figure 1, it is that electrical connection has current detection module 31 and voltage detection module 32 that this pick-up unit includes a power supply 3, wherein said voltage detection module 32 is to be powered at other each parts for general supply, sound transducer 1 and sound amplifying circuit module 13, it is the Electromagnetic Heating control circuit of electrical connection single-chip microcomputer 2 interior settings, boiling degree by the received sound detection water of described sound transducer 1, wherein, described sound transducer 1 is the described sound amplifying circuit module 13 of electrical connection, receive sound on the electromagnetic oven by sound transducer 1, recycle the amplification principle of described sound amplifying circuit module 13, corresponding signal is transferred in the described single-chip microcomputer 2, described sound amplifying circuit module 13 includes pre-amplification circuit 131, frequency selective network 132, amplifying circuit 133, signal intensity regulating circuit 134 and waveform output circuit 135, wherein, by described sound transducer 1 electrical connection pre-amplification circuit 131, sound signal by these pre-amplification circuit 131 voice emplifying sensors 1, described pre-amplification circuit 131 is electrical connection frequency selective networks 132, the described amplifying circuit 133 of described frequency selective network 132 electrical connections, described amplifying circuit 133 electrical connection signal intensity regulating circuits 134, the described waveform output circuit 135 of described signal intensity regulating circuit 134 electrical connections, the output port that is provided with by described waveform output circuit 135 is electrically connected the input port (as shown in Figure 3) that described single-chip microcomputer 2 is provided with.
Described single-chip microcomputer 2 electrical connections have IGBT temperature detecting module 11, cooking bottom temperature detection module 12, and single-chip microcomputer 2 is interior by power control module 21, temperature control modules 22, without pot detection module 23, voltage alarm module 24, IGBT temperature alarming module 25 and cooking bottom temperature alarm module 26 one combine, wherein, the described IGBT temperature alarming module 25 of described IGBT temperature detecting module 11 electrical connections, it is the temperature for monitoring IGBT, the described cooking bottom temperature alarm module 26 of described cooking bottom temperature detection module 12 electrical connections, thereby the too high phenomenon of restriction cooking bottom temperature.
Described voltage detection module 32 more is electrically connected field coil 4; to be positioned at pot P on the field coil 4 for heating; and field coil 4 electrical connections have synchronization module 41; oscillation module 42; IGBT driver module 43; overvoltage protective module 44 and current feedback control module 45; wherein; described overvoltage protective module 44 is the described voltage detection module 32 of electrical connection; behind regulation voltage; carry power supply power supply to described IGBT driver module 43 by electrical connection again; the described current feedback control module 45 of described single-chip microcomputer 2 electrical connections, the magnitude of current that passes through to feed back is delivered to described oscillation module 42.
Again, described single-chip microcomputer 2 electrical connection fan 5, voice module 6 and keyboard display screens 7, it should be noted that the sound that described fan 5 produces when rotating is one constant decibel of sound, thereby single-chip microcomputer 2 set sound amounts be the stack enter, that is to say, audio signal is to have the sound signal that the heating of background sound and water sends to be formed by stacking when electromagnetic oven is worked, and the useful signal that the bubble that water when heating produces breaks, its separation control circuit mainly is made of signal intensity regulating circuit (being to be adjustable resistance 20).Background sound signal intensity can be regarded a constant volume as, useful signal intensity is very little when just beginning to heat, make mixed signal intensity much smaller than the signal intensity of circuit operation (output switching activity) by adjusting, background signal just can not make circuit operation like this, is equivalent to separate, along with the rising of temperature, water heating signal (useful signal) strength increase, be increased to certain value, make circuit operation, output switching activity.The signal that sound amplifying circuit module 13 is processed is high-low level or pulse signal, by the Circuit tuning parameter, be that 70 sound when spending are maximum in water temperature, do the level upset, and it is above as first identification signal to continue for 8 seconds, described single-chip microcomputer 2 sound variation when water seethes with excitement, again upset count down to the fluidized state that namely is judged as water after n the pulse this moment.
As shown in Figure 2, described sound transducer 1 is the lower position that is positioned at ceramic wafer B, to be used as to collect the sound, its sound error is within 15 seconds, and described single-chip microcomputer 2 is that electrical connection is on circuit board A, therefore, in the control circuit that uses single-chip microcomputer 2, add the audio frequency detection circuit, by the sound in the particular range frequency being amplified output high-low level or pulse, and send single-chip microcomputer to, process and judge to determine whether boiled boiling of water by 2 pairs of signals of single-chip microcomputer.
The first preferred embodiment such as Fig. 3 and the shown sound amplifying circuit of Fig. 3 a module 13, the waveform output circuit 135 that arranges in it is provided with the first resistance 1351 and the first triode 1355, wherein, the first triode 1355 is the NPN pipe, and the base stage b of the first resistance 1351 electrical connections the first triode 1355, this moment, the collector c of the first triode 1355 was electrically connected the second resistance 1352, and being electrically connected the signal input part of the signal output part 1357 electrical connection single-chip microcomputers 2 of extending out between the second resistance 1352 in the collector c of this first triode 1355, the signal that this signal output part 1357 is exported is low level signal.
The second preferred embodiment such as Fig. 4 and the shown sound amplifying circuit of Fig. 4 a module 13, be provided with the base stage b of the first resistance 1351 electrical connections the first triode 1355 in the described waveform output circuit 135, the collector c of described the first triode 1355 be connected in parallel the second resistance 1352 and the 4th resistance 1354, the second resistance 1352 is connected in series an end of the 3rd resistance 1353, the other end of the 3rd resistance 1353 is electrically connected the collector c of the second triode 1356, described the 4th resistance 1354 is electrically connected the base stage b of described the second triode 1356, and described the first triode 1355 and the second triode 1356 are to be the NPN pipe, the signal output part 1357 of therefore extending out between the collector c of the 3rd resistance 1353 and the second triode 1356 is the signal input part of electrical connection single-chip microcomputer 2, and the output signal of described signal output part 1357 is high level signal.
According to the above description, and by reference to the accompanying drawings as preferred embodiments of the present invention, right, other equivalent embodiment of the present invention is not limited to this, understands by described implementation, and above-mentioned embodiment has disclosed concrete function of the present invention and architectural characteristic.
Claims (2)
1. the water boiling detection device of an electromagnetic oven, it comprises sound transducer (1) and sound amplifying circuit module (13), it is characterized in that: described sound transducer (1) electrical connection sound amplifying circuit module (13), and by described sound amplifying circuit module (13) electrical connection single-chip microcomputer (2), described single-chip microcomputer is provided with the Electromagnetic Heating control circuit in (2), sound by water that described sound transducer receives boiling, described sound amplifying circuit module (13) includes pre-amplification circuit (131), frequency selective network (132), amplifying circuit (133), signal intensity regulating circuit (134) and waveform output circuit (135), wherein, described sound transducer (1) electrical connection pre-amplification circuit (131), described pre-amplification circuit (131) is electrical connection frequency selective network (132), described frequency selective network (132) is electrically connected described amplifying circuit (133), described amplifying circuit (133) electrical connection signal intensity regulating circuit (134), described signal intensity regulating circuit (134) electrical connection described waveform output circuit (135), the output port that is provided with by described waveform output circuit (135) is electrically connected the input port that described single-chip microcomputer (2) is provided with, be provided with the base stage (b) of the first resistance (1351) electrical connection the first triode (1355) in the described waveform output circuit (135), the collector (c) of described the first triode (1355) be connected in parallel the second resistance (1352) and the 4th resistance (1354), the second resistance (1352) is connected in series an end of the 3rd resistance (1353), the other end of the 3rd resistance (1353) is electrically connected the collector (c) of the second triode (1356), described the 4th resistance (1354) is electrically connected the base stage (b) of described the second triode (1356), described the first triode (1355) and the second triode (1356) are to be the NPN pipe, the signal output part (1357) of therefore extending out between the collector (c) of the 3rd resistance (1353) and the second triode (1356) is the signal input part of electrical connection single-chip microcomputer (2), and the output signal of described signal output part (1357) is high level signal.
2. the water boiling detection device of electromagnetic oven according to claim 1, it is characterized in that: described sound transducer (1) is the lower position that is positioned at a ceramic wafer (B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607284 CN102128677B (en) | 2010-12-27 | 2010-12-27 | Water boiling detection device for electromagnetic oven |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607284 CN102128677B (en) | 2010-12-27 | 2010-12-27 | Water boiling detection device for electromagnetic oven |
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| CN102128677A CN102128677A (en) | 2011-07-20 |
| CN102128677B true CN102128677B (en) | 2013-03-13 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508056A (en) * | 2011-09-29 | 2012-06-20 | 宁波市奥迪斯丹船用厨房设备有限公司 | Detection device of induction cooker |
| 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 |
| CN103096550A (en) * | 2013-01-21 | 2013-05-08 | 董晓波 | Method and device of cooker heating control |
| CN103115936B (en) * | 2013-01-29 | 2015-01-28 | 浙江大学 | Detection method and device of boiling state |
| CN104251502B (en) * | 2014-09-25 | 2017-01-11 | 中山市法兰宝电业有限公司 | Control system for audio curve detection of boiling water in electromagnetic oven and method thereof |
| CN107340311B (en) * | 2016-05-03 | 2020-02-04 | 佛山市顺德区美的电热电器制造有限公司 | Method for detecting liquid boiling and heating device |
| CN110313839A (en) * | 2018-03-28 | 2019-10-11 | 佛山市顺德区美的电热电器制造有限公司 | It can identify the cookware, method and system and the equipment for heating liquid of liquid boiling |
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|---|---|---|---|---|
| US3240674A (en) * | 1962-10-15 | 1966-03-15 | Atomic Energy Authority Uk | Detection of liquid boiling in a reactor |
| CN2528352Y (en) * | 2002-03-04 | 2003-01-01 | 王剑 | Automatic controller for water boiling of audio-frequency electric kettle |
| CN101308362A (en) * | 2007-05-16 | 2008-11-19 | 黄瑞中 | Method and apparatus for detecting and controlling liquid boiling |
| CN201166794Y (en) * | 2008-02-26 | 2008-12-17 | 美的集团有限公司 | Electromagnetic oven cooking sound control device |
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2010
- 2010-12-27 CN CN 201010607284 patent/CN102128677B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3240674A (en) * | 1962-10-15 | 1966-03-15 | Atomic Energy Authority Uk | Detection of liquid boiling in a reactor |
| CN2528352Y (en) * | 2002-03-04 | 2003-01-01 | 王剑 | Automatic controller for water boiling of audio-frequency electric kettle |
| CN101308362A (en) * | 2007-05-16 | 2008-11-19 | 黄瑞中 | Method and apparatus for detecting and controlling liquid boiling |
| CN201166794Y (en) * | 2008-02-26 | 2008-12-17 | 美的集团有限公司 | Electromagnetic oven cooking sound control device |
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