CN202082979U - Electromagnetic oven - Google Patents
Electromagnetic oven Download PDFInfo
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- CN202082979U CN202082979U CN2011201197343U CN201120119734U CN202082979U CN 202082979 U CN202082979 U CN 202082979U CN 2011201197343 U CN2011201197343 U CN 2011201197343U CN 201120119734 U CN201120119734 U CN 201120119734U CN 202082979 U CN202082979 U CN 202082979U
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Abstract
The utility model relates to an electromagnetic oven, which comprises a panel, an electromagnetic heating coil and a control circuit, and is characterized in that: at least one positive temperature coefficient temperature sensor pattern is printed on the upper surface of the panel to realize contact with a heated boiler; a first coil is printed on the panel with a conducting sizing agent, and is electrically connected with a positive coefficient temperature sensor; and the electromagnetic oven further comprises a second coil which is magnetically coupled with the first coil, and a processing circuit which is electrically connected between the second coil and the control circuit.
Description
Technical field
The utility model belongs to a kind of electromagnetism cooking apparatus, relates in particular to a kind of accurate temperature measuring equipment that is used for the electromagnetic oven stove and accessory.
Background technology
Electromagnetic oven utilizes coil panel to produce alternating magnetic field under the effect of control circuit, produce a large amount of intensive eddy current through magnetic conductivity (irony) pan, eddy current makes the random motion of pan iron atom high speed, and atom runs foul of each other, rubs and produces heat energy, energy efficiency extra-high-speed.With the electromagnetic oven heating pan function of cooking, heat up water, the overwhelming majority that can finish family cooks task, is deep into more and more in people's the life.The temperature detection of existing electromagnetic oven mostly is contact temperature greatly and detects, and relies on the thermistor that is installed in Inside coil dish centre to come detected temperatures.This thermistor is close to the ceramic wafer lower surface by resiliency supported, electromagnetic heating device is to make by electromagnetic induction principle to be subjected to the heating of heat load bottom, heat is by being subjected to heat load to pass to ceramic wafer, conduct to thermistor again by ceramic wafer, this structure deficiency is that sensed temperature can not directly reflect the true temperature in the pot.The influence of some heater members in the electromagnetic oven and cooling fan is bigger in addition, so shortcoming such as this thermometric mode exists that temperature-sensitive is slow, thermometric is inaccurate and reliability is low pan distortion or electromagnetic oven often occur and damages.
China utility model patent CN2847774(was on December 13rd, 2006 in open day) a kind of electromagnetic oven heating control device disclosed, in order to realize the accurate temperature controlling of electromagnetic oven, adopt mode that the temperature-sensitive head of control circuit is reached in pot body or the pot with a flexible circuit conductor, temperature-sensitive is the most direct, can control the heating power of electromagnetic oven according to the required temperature of pot body, can accurately control the interior temperature of pot body and can reach the effect that cooking person requires.And Chinese invention patent CN1545963(was on November 17th, 2004 in open day), this patent of invention discloses a kind of wireless temperature measurement pan, comprise a pot body, temperature sensing circuit and temperature-control circuit, also comprise one group of wireless launcher and radio receiver, temperature sensing circuit is located at pot surface and is electrically connected with wireless launcher, radio receiver is electrically connected with temperature-control circuit, and temperature-sensitive head and temperature sensing circuit all are to be placed on pot body.Though above-mentioned prior art can directly be measured the temperature of pan, but must use special-purpose pan, sensor and checkout gear to need assembling battery separately, the user uses inconvenience, has also additionally increased the user and has changed battery cost.
Summary of the invention
Big or direct temperature measurement needs the inconvenience of configure dedicated pan for the temperature detection error that overcomes prior art, the purpose of the utility model be to provide a kind of thermometric accurately in real time, the temperature measuring equipment of electromagnetic oven that need not special-purpose pan coupling.
At above essential technique problem, the corresponding technical solution scheme of the utility model is:
A kind of electromagnetic oven, comprise panel, electromagnetic heating coil and control circuit, it is characterized in that, the upper surface that at least one positive temperature coefficient temperature sensor pattern is printed on described panel contacts with heated pan with realization, on described panel, print one first coil with electrocondution slurry, this first coil and described positive temperature coefficient temperature sensor are electrically connected, also comprise and magnetic-coupled second coil of first coil, and, a treatment circuit that is electrically connected between described second coil and the described control circuit.The utility model use PTC(positive temperature coefficient) temperature of material tests pan, when the temperature of pan is transmitted by contact, this ptc material has unique electricity-Re-physical property, obtained in every respect using widely, increase with temperature increases its thermometric based on the resistance value of metallic conductor, constitute temperature-sensitive circuit in order to direct detection pan temperature by PTC first coil of connecting, the coupling of second coil and first coil is set, it is the oscillator signal of f0 that source oscillation signal provides a frequency, in temperature one regularly, the resistance of PTC is just certain, by regulating f0 when a suitable value, two circuit will produce a resonance up and down, and signal value output U0 just is maximum.By this relation, one of them is set at fixed value can to find to need only between temperature T and f0, the U0 three f0 and U0, and temperature T will have relation one to one with another parameter, and this relation can record by test.Like this by recording the value that f0 or U0 just can learn temperature T, based on this principle accurate temperature measuring equipment that above-mentioned electromagnetic oven is provided of the present utility model.
Described treatment circuit comprises: at least one first electric capacity, the oscillation signal generator that is in series with this first electric capacity, this oscillation signal generator produces resonance in order to the oscillator signal that a fixed frequency is provided, described second coil is signal value output U1 place with position between described first electric capacity is connected, and signal value output U1 place produces a pure oscillation waveform and export direct current signal after delivering to plastic filter circuit behind current-limiting resistance R and the shaping element that sine wave shaped is become direct current.
Further, second coil be positioned at first coil directly over or under.Because electromagnetic oven is to send the magnetic field heating pan by heater coil, when the work of heating magnetic field heating, can disturb this first coil magnetic signal, therefore make as far as possible second coil be positioned at first coil directly over or under the position, discharge interference.
First coil is made the spiral thick film coil of single or multiple lift for the thick film conductor paste method for printing screen.
Preferably, first coil and second coil are the wide line footpath of 0.3mm, are printed as 10 circles and make.
Inductance value 100nH ~ the 800nH of first coil, the Q value is 0.02.
First coil and second coil are printed as square, and experiment records has technique effect better.
The described electrocondution slurry that is used to make first coil is gold, silver, copper, platinum or palladium slurry.
Electromagnetic oven compared to existing technology, the utility model electromagnetic oven temperature measuring equipment has following technique effect:
1. the PTC temperature sensing material directly contacts with pan, the temperature of real-time perception pan, and thermometric is accurate, in real time.
2. the PTC temperature sensing material is the upper surface that is printed on the electromagnetic oven porcelain plate, avoids the influence of cooling fan of electromagnetic oven, and thermometric is more accurate.
3. technical solutions of the utility model do not need pan is carried out specially treated, are user-friendly to and change pan.
4. need not to destroy the porcelain plate integrality in the technical solutions of the utility model, also do not need the supplying cell of built-in wireless transmission receiver module and coupling, simplify the structure.
Description of drawings
Fig. 1 is the circuit theory diagrams of the accurate temperature sensing device of the utility model electromagnetic oven.
Fig. 2 is the connection diagram of the utility model PTC coil and first coil.
The specific embodiment
The accurate temperature measuring equipment of electromagnetic oven shown in the embodiment 1 comprises electromagnetic oven porcelain plate, electromagnetic heating coil and control circuit.
The upper surface that at least one positive temperature coefficient temperature sensor 3 pattern is printed on described panel contacts with heated pan with realization, on described panel, print one first coil 1 with electrocondution slurry, this first coil 1 is electrically connected with described positive temperature coefficient temperature sensor 3, also comprise and magnetic-coupled second coil 2 of first coil, and, a treatment circuit that is electrically connected between described second coil and the described control circuit.
Described treatment circuit comprises: at least one first electric capacity, the oscillation signal generator that is in series with this first electric capacity, this oscillation signal generator produces resonance in order to the oscillator signal that a fixed frequency is provided, described second coil is signal value output U1 place with position between described first electric capacity is connected, and signal value output U1 place produces a pure oscillation waveform and export direct current signal after delivering to plastic filter circuit behind current-limiting resistance R and the shaping element that sine wave shaped is become direct current.
The utility model is printed on the PTC slurry on the center of nonmetallic materials upper surface (porcelain plate of electromagnetic oven) equably, and PTC contacts with pan, directly the temperature of perception pan.
Utilize electrocondution slurry one first coil of printing uniformly equally at the electromagnetic oven edge, first coil is connected with the positive temperature coefficient temperature sensor.Under first coil, place one and coil 1 shape second coil of the same size.Be connected to a source oscillation signal after second coil and a capacitances in series.
It is the oscillator signal of f0 that signal source provides a fixed frequency, two circuit will produce a resonance up and down, signal value output U1 place produces a pure oscillation waveform, by resistance R 1 current limliting, diode D1 becomes direct current to sine wave shaped, again by obtaining a direct current signal U0 that ripple is little behind R2 and the C2 shaping filter.Relational expression a: U0=f (X) * Rptc is arranged between U0 and the PTC; Wherein Rptc be PTC resistance; Be to come correspondingly by f (X) between Rptc and the U0, for a circuit of determining to get well, f (X) determines.Just can calculate the value of Rptc like this by the size that records U0,, just know current temperature by the corresponding form of Rptc with T.Manufacturer can make that the peak-to-peak value of U1 is good by the parameter of adjusting coil 2, C1 and F0 about 50V, the parameter of L2 and C1 can be determined by experiment, and F0=1/2 π (L2*C1) 1/2, so the parameter of F0 has also just been determined.
The position of PTC is printed on the center of electromagnetic oven porcelain plate, generally is designed to circle, and is consistent with the bottom of pot body shape.Also can be designed to other shapes, can determine according to the shape of pot.
The used electrocondution slurry of the utility model first coil is exactly to print a kind of can being used for, and the metal material that conducts electricity very well can be a silver, copper etc.
First coil 1 is consistent with the shape size of second coil 2, and the utility model adopts the wide line footpath of 0.3mm, and printing 10 circles just can obtain a good effect.Shape can be printed as square.In addition the helical form arc also can, present embodiment selects square.
In sum; after those of ordinary skill in the art reads the utility model file; need not creative mental labour according to the technical solution of the utility model and technical conceive and make other various corresponding conversion scheme, all belong to the scope that the utility model is protected.
Claims (8)
1. electromagnetic oven, comprise panel, electromagnetic heating coil and control circuit, it is characterized in that, the upper surface that at least one positive temperature coefficient temperature sensor pattern is printed on described panel contacts with heated pan with realization, on described panel, print one first coil with electrocondution slurry, this first coil and described positive temperature coefficient temperature sensor are electrically connected, also comprise and magnetic-coupled second coil of first coil, and, a treatment circuit that is electrically connected between described second coil and the described control circuit.
2. electromagnetic oven as claimed in claim 1, it is characterized in that, described treatment circuit comprises: at least one first electric capacity, the oscillation signal generator that is in series with this first electric capacity, this oscillation signal generator produces resonance in order to the oscillator signal that a fixed frequency is provided, described second coil is signal value output U1 place with position between described first electric capacity is connected, and signal value output U1 place produces a pure oscillation waveform and export direct current signal after delivering to plastic filter circuit behind current-limiting resistance R and the shaping element that sine wave shaped is become direct current.
3. electromagnetic oven as claimed in claim 1 is characterized in that, described second coil be positioned at substantially first coil directly over or under.
4. electromagnetic oven as claimed in claim 1 is characterized in that, the spiral thick film coil of single or multiple lift that described first coil is made for the thick film conductor paste method for printing screen.
5. electromagnetic oven as claimed in claim 3 is characterized in that, described first coil and described second coil are the wide line footpath of 0.3mm, are printed as 10 circles and make.
6. electromagnetic oven as claimed in claim 3 is characterized in that, the inductance value 100nH ~ 800nH of described first coil, and the Q value is 0.02.
7. electromagnetic oven as claimed in claim 5 is characterized in that, described first coil and described second coil are printed as square.
8. electromagnetic oven as claimed in claim 1 is characterized in that, electrocondution slurry is gold, silver, copper, platinum or palladium slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201197343U CN202082979U (en) | 2011-04-21 | 2011-04-21 | Electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201197343U CN202082979U (en) | 2011-04-21 | 2011-04-21 | Electromagnetic oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202082979U true CN202082979U (en) | 2011-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201197343U Expired - Lifetime CN202082979U (en) | 2011-04-21 | 2011-04-21 | Electromagnetic oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202082979U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226539A (en) * | 2011-04-21 | 2011-10-26 | 浙江苏泊尔家电制造有限公司 | Induction cooker and temperature measurement method thereof |
| CN105792400A (en) * | 2016-04-19 | 2016-07-20 | 广东美的厨房电器制造有限公司 | Induction cooker and method for detecting pan on induction cooker |
| CN105850226A (en) * | 2013-12-27 | 2016-08-10 | 阿塞里克股份有限公司 | An induction cooker comprising an illumination element |
-
2011
- 2011-04-21 CN CN2011201197343U patent/CN202082979U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226539A (en) * | 2011-04-21 | 2011-10-26 | 浙江苏泊尔家电制造有限公司 | Induction cooker and temperature measurement method thereof |
| CN102226539B (en) * | 2011-04-21 | 2015-07-15 | 浙江苏泊尔家电制造有限公司 | Induction cooker and temperature measurement method thereof |
| CN105850226A (en) * | 2013-12-27 | 2016-08-10 | 阿塞里克股份有限公司 | An induction cooker comprising an illumination element |
| CN105792400A (en) * | 2016-04-19 | 2016-07-20 | 广东美的厨房电器制造有限公司 | Induction cooker and method for detecting pan on induction cooker |
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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: 20111221 |