CN201885796U - Water boiling detection device for induction cooker - Google Patents
Water boiling detection device for induction cooker Download PDFInfo
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- CN201885796U CN201885796U CN2010206821339U CN201020682133U CN201885796U CN 201885796 U CN201885796 U CN 201885796U CN 2010206821339 U CN2010206821339 U CN 2010206821339U CN 201020682133 U CN201020682133 U CN 201020682133U CN 201885796 U CN201885796 U CN 201885796U
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Abstract
The utility model discloses a water boiling detection device for an induction cooker, which comprises a sound sensor and a sound amplification circuit, wherein the sound sensor is electrically connected with the sound amplification circuit; the sound amplification circuit is electrically connected with a single chip; an electromagnetic heating control circuit is arranged in the single chip; the water boiling detection device not only can detect the water boiling, but also can be automatically powered off based on the water boiling sound received by the sound sensor and is not affected by background noise during the process of accurately determining whether the water is boiling. The circuit structure of the water boiling detection device is simple, and the sound error is within 15 seconds.
Description
Technical field
The utility model relates to a kind of electromagnetic oven method for burning water, and the detailed water boiling Jian Ce Installed that relates to a kind of electromagnetic oven puts, by specified sound intensity value is set in single-chip microcomputer, and the lasting intensity of the sound when utilizing water to seethe with excitement and control 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 elevated temperature heat and melts no fire on plastics, household aspect such as cook the good thermal effect that adds is all arranged.
The patent No. is: 94244165.6 disclose a kind of vibration testing type water boiling pick-up unit, 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 handle through circuit, become sound signal, send alerting signal by loudspeaker again.The patent No. is: 200720055611.1 disclose a kind of boiling 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 influence the energising situation of body.
In addition, the electromagnetic oven boiler face that has is provided with temperature sensor, detect the water temperature in the pan, but exist error bigger, temperature causes easy the to be malfunctioning phenomenon of sensor too lastingly, make the automatic poor effect that boils water, 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 utility model is the pick-up unit for a kind of water boiling, and the sound intensity effect that its fundamental purpose is produced 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 utility model comprises sound transducer and sound amplifying circuit, forms in conjunction with the electromagnetism heating control circuit that is provided with in the single-chip microcomputer, by the boiling degree of the received sound detection water of described sound transducer.
Add the audio frequency testing circuit in the electromagnetic oven control circuit 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 handled 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 the electromagnetism heating produces etc.
In addition, the useful signal that the bubble that produces during the water heating breaks, its separation control circuit mainly constitute (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 the signal intensity of mixed signal intensity by adjusting much smaller than circuit operation (output switching activity), 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) intensity increases, 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 to be electrically connected frequency selective network, described frequency selective network is electrically connected described amplifying circuit, described amplifying circuit is electrically connected the 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 first resistance and first triode, wherein, first triode is the NPN pipe, and first resistance is electrically connected the base stage of first triode, this moment, the collector of first triode was electrically connected second resistance, and being electrically connected the signal input part that the signal output part of extending out between second resistance is electrically connected single-chip microcomputer in the collector of this first triode, the signal that this signal output part is exported is a low level signal.
Be provided with the base stage that first resistance is electrically connected first triode in the described waveform output circuit, and an end of second resistance is electrically connected the collector of first triode, the other end of second resistance be connected in parallel the 3rd resistance and the 4th resistance, wherein an end of the 3rd resistance is electrically connected the collector of second triode, described the 4th resistance is electrically connected the base stage of described second triode, described first triode and second triode are to be the NPN pipe, therefore the signal output part of extending out between the collector of the 3rd resistance and second triode is the signal input part that is electrically connected single-chip microcomputer, and the output signal of described signal output part is a high level signal.
In addition, described sound transducer is installed on electromagnetic oven shell lower surface apart from ceramic wafer the most nearby.
Further, sound amplifying circuit processing signals is high-low level or pulse signal, by adjusting circuit parameter, in water temperature is 70 maximums of sound when spending, 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, upset once more, promptly be judged as boiling after counting down to n pulse this moment.
The beneficial effects of the utility model are that it can not only detect the water boiling, and can also shut down automatically, are not subjected to the influence 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 utility model.
Fig. 2 is the scheme of installation of the utility model sound transducer.
Fig. 3 is the first preferred embodiment synoptic diagram of sound amplifying circuit module of the present utility model.
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 utility model.
Fig. 4 a is the synoptic diagram of Fig. 4 high level.
Embodiment
See also shown in Figure 1, it is to be electrically connected 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, be to be electrically connected the electromagnetism heating control circuit that is provided with in the single-chip microcomputer 2, boiling degree by the received sound detection water of described sound transducer 1, wherein, described sound transducer 1 is to be electrically connected described sound amplifying circuit module 13, receive sound on the electromagnetic oven by sound transducer 1, utilize the amplification principle of described sound amplifying circuit module 13 again, 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, be electrically connected pre-amplification circuit 131 by described sound transducer 1, sound signal by these pre-amplification circuit 131 voice emplifying sensors 1, described pre-amplification circuit 131 is to be electrically connected frequency selective network 132, described frequency selective network 132 is electrically connected described amplifying circuit 133, described amplifying circuit 133 is electrically connected signal intensity regulating circuit 134, described signal intensity regulating circuit 134 is electrically connected 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, as shown in Figure 3.
Described single-chip microcomputer 2 has been electrically connected 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, there is not pot detection module 23, voltage alarm module 24, IGBT temperature alarming module 25 and cooking bottom temperature alarm module 26 one combine, wherein, described IGBT temperature detecting module 11 is electrically connected described IGBT temperature alarming module 25, it is the temperature that is used to monitor IGBT, described cooking bottom temperature detection module 12 is electrically connected described cooking bottom temperature alarm module 26, thus the too high phenomenon of restriction cooking bottom temperature.
Described voltage detection module 32 more has been electrically connected field coil 4; be to be used to heat the pot P that is positioned on the field coil 4; and field coil 4 has been electrically connected synchronization module 41; oscillation module 42; IGBT driver module 43; overvoltage protective module 44 and Current Negative Three-Point Capacitance control module 45; wherein; described overvoltage protective module 44 is to be electrically connected described voltage detection module 32; behind regulation voltage; carry power supply power supply to described IGBT driver module 43 by being electrically connected again; described single-chip microcomputer 2 is electrically connected described Current Negative Three-Point Capacitance control module 45, and the magnitude of current that passes through to be fed back is delivered to described oscillation module 42.
Again, described single-chip microcomputer 2 is electrically connected fan 5, voice module 6 and keyboard display screen 7, it should be noted that the sound that described fan 5 is produced 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 the signal intensity of mixed signal intensity by adjusting much smaller than circuit operation (output switching activity), 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) intensity increases, be increased to certain value, make circuit operation, output switching activity.The signal that sound amplifying circuit module 13 is handled is high-low level or pulse signal, by adjusting circuit parameter, in water temperature is 70 maximums of sound when spending, 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, upset once more count down to the fluidized state that promptly 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 make to collect the usefulness of the sound, its sound error is within 15 seconds, and described single-chip microcomputer 2 is to be electrically connected on circuit board A, therefore, in the control circuit that uses single-chip microcomputer 2, add the audio frequency testing circuit, by the sound in the particular range frequency being amplified output high-low level or pulse, and send single-chip microcomputer to, handle and judge to determine whether boiled boiling of water by 2 pairs of signals of single-chip microcomputer.
First preferred embodiment as Fig. 3 and the shown sound amplifying circuit of Fig. 3 a module 13, the waveform output circuit 135 that is provided with in it is provided with first resistance 1351 and first triode 1355, wherein, first triode 1355 is the NPN pipe, and first resistance 1351 is electrically connected the base stage b of first triode 1355, this moment, the collector c of first triode 1355 was electrically connected second resistance 1352, and being electrically connected the signal input part that the signal output part 1357 of extending out between second resistance 1352 is electrically connected single-chip microcomputer 2 in the collector c of this first triode 1355, the signal that this signal output part 1357 is exported is a low level signal.
Second preferred embodiment as Fig. 4 and the shown sound amplifying circuit of Fig. 4 a module 13, be provided with the base stage b that first resistance 1351 ' is electrically connected first triode 1355 ' in the described waveform output circuit 135 ', and an end of second resistance 1352 ' is electrically connected the collector c of first triode 1355 ', the other end of second resistance 1352 ' be connected in parallel the 3rd resistance 1353 ' and the 4th resistance 1354 ', wherein an end of the 3rd resistance 1353 ' is electrically connected the collector c of second triode 1356, described the 4th resistance 1354 ' is electrically connected the base stage b of described second triode 1356, and described first triode 1355 ' and second triode 1356 are to be the NPN pipe, therefore the signal output part 1357 ' of extending out between the collector c of the 3rd resistance 1353 ' and second triode 1356 is the signal input part that is electrically connected single-chip microcomputer 2, and the output signal of described signal output part 1357 ' is a high level signal.
According to the above description, and in conjunction with the accompanying drawings as better embodiment of the present utility model, right, other equivalent embodiment of the present utility model is not limited thereto, understand by described concrete enforcement, above-mentioned embodiment has disclosed concrete function of the present utility model and architectural characteristic.
Claims (5)
1. the water of electromagnetic oven boiling pick-up unit, it comprises sound transducer (1) and sound amplifying circuit (13), it is characterized in that described sound transducer (1) is electrically connected sound amplifying circuit (13), and be electrically connected single-chip microcomputer (2) by described sound amplifying circuit (13), described single-chip microcomputer is provided with the electromagnetism heating control circuit in (2), by the sound of water that described sound transducer receives boiling.
2. the water of electromagnetic oven according to claim 1 boiling pick-up unit, it is characterized in that: 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, be electrically connected pre-amplification circuit (131) by described sound transducer (1), described pre-amplification circuit (131) is to be electrically connected frequency selective network (132), described frequency selective network (132) is electrically connected described amplifying circuit (133), described amplifying circuit (133) is electrically connected signal intensity regulating circuit (134), described signal intensity regulating circuit (134) is electrically connected described waveform output circuit (135), and 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.
3. the water of electromagnetic oven according to claim 2 boiling pick-up unit, it is characterized in that: described waveform output circuit (135) is provided with first resistance (1351) and first triode (1355), wherein, first triode (1355) is the NPN pipe, and first resistance (1351) is electrically connected the base stage (b) of first triode (1355), the collector (c) of first triode (1355) is electrically connected second resistance (1352), and being electrically connected the signal input part that the signal output part (1357) of extending out between second resistance (1352) is electrically connected single-chip microcomputer (2) in the collector (c) of this first triode (1355), the signal that this signal output part (1357) is exported is a low level signal.
4. the water of electromagnetic oven according to claim 3 boiling pick-up unit, it is characterized in that: be provided with the base stage (b) that first resistance (1351 ') is electrically connected first triode (1355 ') in the described waveform output circuit (135 '), and an end of second resistance (1352 ') is electrically connected the collector (c) of first triode (1355 '), the other end of second resistance (1352 ') be connected in parallel the 3rd resistance (1353 ') and the 4th resistance (1354 '), wherein an end of the 3rd resistance (1353 ') is electrically connected the collector (c) of second triode (1356), described the 4th resistance (1354 ') is electrically connected the base stage (b) of described second triode (1356), described first triode (1355 ') and second triode (1356) are to be the NPN pipe, the signal output part (1357 ') of extending out between the collector (c) of the 3rd resistance (1353 ') and second triode (1356) is the signal input part that is electrically connected single-chip microcomputer (2), and described signal output part (1357 ') is the high level signal output terminal.
5. the water of electromagnetic oven according to claim 1 boiling pick-up unit, 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 |
|---|---|---|---|
| CN2010206821339U CN201885796U (en) | 2010-12-27 | 2010-12-27 | Water boiling detection device for induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206821339U CN201885796U (en) | 2010-12-27 | 2010-12-27 | Water boiling detection device for induction cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201885796U true CN201885796U (en) | 2011-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206821339U Expired - Lifetime CN201885796U (en) | 2010-12-27 | 2010-12-27 | Water boiling detection device for induction cooker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201885796U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102813460A (en) * | 2012-08-30 | 2012-12-12 | 厦门越一电子科技有限公司 | Boiling water identification circuit and tea tray of induction cooker |
| CN107992808A (en) * | 2017-11-24 | 2018-05-04 | 朱健坤 | The feature extraction of acoustic signals time-frequency combination and boiling recognition methods of boiling vibrating |
-
2010
- 2010-12-27 CN CN2010206821339U patent/CN201885796U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102813460A (en) * | 2012-08-30 | 2012-12-12 | 厦门越一电子科技有限公司 | Boiling water identification circuit and tea tray of induction cooker |
| CN107992808A (en) * | 2017-11-24 | 2018-05-04 | 朱健坤 | The feature extraction of acoustic signals time-frequency combination and boiling recognition methods of boiling vibrating |
| CN107992808B (en) * | 2017-11-24 | 2019-01-11 | 朱健坤 | The feature extraction of acoustic signals time-frequency combination and boiling recognition methods of boiling vibrating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |