CN100534239C - Electromagnetic inductive heating circuit - Google Patents
Electromagnetic inductive heating circuit Download PDFInfo
- Publication number
- CN100534239C CN100534239C CNB2007100154635A CN200710015463A CN100534239C CN 100534239 C CN100534239 C CN 100534239C CN B2007100154635 A CNB2007100154635 A CN B2007100154635A CN 200710015463 A CN200710015463 A CN 200710015463A CN 100534239 C CN100534239 C CN 100534239C
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- inductance
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- circuit
- electromagnetic induction
- magnetic conductor
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- 238000010438 heat treatment Methods 0.000 title abstract description 7
- 230000001939 inductive effect Effects 0.000 title 1
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 20
- 239000004020 conductor Substances 0.000 claims description 27
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention relates to an electromagnetic induction heating circuit, in which, the described power transistor is IGBT, and the described inductance are formed by inductance coil and magnetic stripe, and the described inductance compensation is formed by the inductance coil which totally or partially through at least one independent magnet ring, and the described magnet ring is formed by magnet and referred magnetic stripe. The saturation of the magnet ring in a certain working region dynamically adjusts the inductance of coil, which can effectively resolves the problem of a high temperature rising of low-power working condition.
Description
Technical field
The invention discloses a kind of electromagnetic induction heater circuit, belong to the electric heating control technology.
Background technology
Electromagnetic heating technique is that the principle of utilizing electromagnetic induction to produce eddy current heats utensil, and widespread usage adopts the capacitor and inductor antiresonant circuit mostly in electrical equipment such as electromagnetic stove, electric cooker at present.Electromagnetic stove for example, select for use IGBT (abbreviation of Isolation Gate Bipolar Transistor igbt) as a kind of power tube, because the parameter of resonant circuit all is the application of mainly satisfying under the high-power state, when high power work, IGBT is in the passing zero trigger state, and loss is very little.When selecting low-power operation, IGBT can't realize passing zero trigger, has caused higher loss, causes the IGBT temperature rise higher, causes power tube to damage when serious, so can't realize the continuous heating under the low power state, is the insoluble problem of the industry always.
The reason that causes this result is because the selection of the resonant parameter of general circuit all is a operating state when high-power determines.But, constant resonant circuit parameters is difficult to satisfy simultaneously the interval job requirement of continuous high-low power of broad, operating state in the time of can't taking into account high-low power, resonant circuit loses condition of resonance in the time of will inevitably causing low-power operation, and the switching loss and the temperature that show as IGBT sharply rise.
Summary of the invention
Technical problem solved by the invention provides a kind of electromagnetic induction heater circuit, and the higher problem of power tube temperature rise in the time of can effectively solving low-power operation can realize selecting the power bracket of broad.
A kind of technical scheme provided by the present invention is: a kind of electromagnetic induction heater circuit, comprise rectification circuit, filter circuit, inductance capacitance antiresonant circuit, power tube, and it is characterized in that string has in running order all the time compensating inductance in the described resonant circuit.
Described power tube is IGBT.
Described inductance is that coil and magnetic stripe form, and described compensating inductance passes at least one ring-type magnetic conductor that independently is provided with by at least one circle of coil and forms.
Described inductance is that coil and magnetic stripe form, and described compensating inductance passes at least one ring-type magnetic conductor by at least one circle of described coil and forms, and described ring-type magnetic conductor is formed by magnetic conductor and described magnetic stripe.
Working mechanism of the present invention and the beneficial effect that brings are such:
At least one circle of coil passes at least one ring-type magnetic conductor that independently is provided with, and forms compensating inductance in resonant tank, and this compensating inductance and coil are series relationship on electric principle.
During low-power, by the compensating inductance that increases on the coil, this compensating inductance and coil are series relationship on electric principle, improve the total inductance amount of resonant tank with this, and because the part magnetic loop closed in itself that this compensating inductance produces, do not pass heating appliances, thereby do not participate in heating directly, so the loss in whole cycle of oscillation is minimum, the remaining energy of later half cycle coil that has guaranteed vibration still can make the C pole tension of IGBT approach zero when opening, because the increase of total inductance amount reduces resonance frequency, the switching loss of IGBT is minimized simultaneously.
During high power, the coil magnetization electric current can increase greatly, this moment is because the restriction of compensating inductance permeability magnetic material characteristic and physical structure, magnetic flux by permeability magnetic material will no longer increase to some greatly, just reach magnetic saturation, alternating current component in the electric current can not cause the variation of magnetic flux more at this moment, compensating inductance also just quite is zero at the inductance value of this operation interval, because the total inductance amount of the saturated back of compensating inductance resonant tank will descend, thereby make resonant circuit can also remain on resonance operating state preferably, IGBT still can the work of low-loss state.
The winding inductance quantity of prior art all is constant, the present invention then passes the ring-type magnetic conductor that at least one independently is provided with by described coil is all or part of, this ring-type magnetic conductor is saturated certain operation interval, the dynamic inductance value of adjusting resonant tank, compensate the state of resonant circuit when different operating powers, operating voltage, make resonant circuit in the high-low power scope, can both remain on good resonance condition under the heated condition continuously, can realize the power bracket of working under the continuous heated condition of broad.
Electromagnetic induction heater circuit of the present invention is applied in electromagnetic stove, electric food warmer, the soy bean milk making machine, can bring same technique effect.
Description of drawings
Be described further below in conjunction with accompanying drawing:
Fig. 1 is the prior art circuits principle schematic;
Fig. 2 is an electromagnetic induction heater circuit schematic diagram of the present invention;
Fig. 3 assembles schematic diagram for first embodiment of compensating inductance of the present invention;
Fig. 4 assembles schematic diagram for second embodiment of compensating inductance of the present invention;
Fig. 5 is the parting face schematic diagram of Fig. 4 embodiment;
Fig. 6 assembles schematic diagram for the 3rd embodiment of compensating inductance of the present invention;
Fig. 7 is the parting face schematic diagram of Fig. 6 embodiment;
Fig. 8 assembles schematic diagram for the 4th embodiment of compensating inductance of the present invention;
Fig. 9 is the parting face schematic diagram of Fig. 8 embodiment;
Wherein: 1, coil; 2, magnetic conductor; 3, coil brace; 4, magnetic stripe; 6 coil leads; 8 rectification circuits; 9, Drive and Control Circuit;
Embodiment
Embodiment one:
Be the prior art electromagnetic induction heater circuit as shown in Figure 1, fully open in the disclosed in early days patent documentation of similar circuit, for example publication number is a kind of electromagnetic oven control device utility model patent of CN2697496, the electromagnetic heating circuit basic functional principle is clearly illustrated, repeat no more.
As Fig. 2, Fig. 3, shown in be a kind of electromagnetic induction heater circuit of the present invention, comprise rectification circuit 8, filter circuit L2C2, inductance capacitance antiresonant circuit L1C1, IGBT (the most frequently used power tube), Drive and Control Circuit 9, string has in running order all the time compensating inductance L3 among the described resonant circuit L1C1, described inductance L 1 is that coil 1 and magnetic stripe 4 form, and described compensating inductance L3 passes an independent ring-type magnetic conductor 2 that is provided with by a coiling of coil 1 and forms.
Embodiment two:
As Fig. 2, Fig. 4, shown in Figure 5, a kind of electromagnetic induction heater circuit is that with the difference of embodiment one coiling of coil 1 passes a closed hoop magnetic conductor 2 that is located at coil brace 3 centers.
Described closed hoop magnetic conductor 2 can be to be involuted by two sections circular-arc magnetic conductors, and air gap is less than 6mm therebetween; Also can be by having air gap " C " shape magnetic conductor, general air gap be less than 6mm;
Embodiment three:
As Fig. 2, Fig. 6, shown in Figure 7, a kind of electromagnetic induction heater circuit is that with the difference of embodiment one whole coilings of described coil 1 pass a closed hoop magnetic conductor 2 that is provided with separately, and closed hoop magnetic conductor 2 is placed on the coil brace 3.
Embodiment four:
As Fig. 2, Fig. 8, shown in Figure 9, a kind of electromagnetic induction heater circuit is that with embodiment three differences coil 1 all passes one group of ring-type magnetic conductor 2 that is formed by magnetic conductor and described magnetic stripe 4, and air gap is less than 6mm therebetween, and present embodiment is air gap 0.1mm.
Pass the ring-type magnetic conductor 2 that forms by magnetic conductor and described magnetic stripe 4 by described coil 1 whole coilings, saturated at certain operation interval, the dynamic inductance value of adjusting coil 1, compensate the state of resonant circuit when different operating powers, operating voltage of forming by coil 1, magnetic stripe 4, resonant capacitance, reduced the loss of IGBT when low power run, the higher problem of IGBT temperature rise in the time of can effectively solving low-power operation can realize selecting the power bracket of broad.
Certainly, the ring-type magnetic conductor also can be two groups or more, can both realize the object of the invention.
Claims (7)
1, a kind of electromagnetic induction heater circuit, comprise antiresonant circuit, power tube that rectification circuit, filter circuit, coil inductance and electric capacity are formed, described coil inductance is that coil and magnetic stripe form, it is characterized in that, string has in running order all the time compensating inductance in the described antiresonant circuit, and described compensating inductance passes at least one ring-type magnetic conductor by at least one circle of described coil and forms.
2, electromagnetic induction heater circuit as claimed in claim 1 is characterized in that described power tube is IGBT.
3, electromagnetic induction heater circuit as claimed in claim 1 or 2 is characterized in that, the ring-type magnetic conductor of described compensating inductance is independent the setting.
4, electromagnetic induction heater circuit as claimed in claim 3 is characterized in that described ring-type magnetic conductor is closed.
5, electromagnetic induction heater circuit as claimed in claim 1 or 2 is characterized in that, the ring-type magnetic conductor of described compensating inductance is to be formed by magnetic conductor and described magnetic stripe.
6, electromagnetic induction heater circuit as claimed in claim 3 is characterized in that the ring-type magnetic conductor has air gap, and air gap is less than 6mm.
7, electromagnetic induction heater circuit as claimed in claim 5 is characterized in that the ring-type magnetic conductor has air gap, and air gap is less than 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100154635A CN100534239C (en) | 2007-04-30 | 2007-04-30 | Electromagnetic inductive heating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100154635A CN100534239C (en) | 2007-04-30 | 2007-04-30 | Electromagnetic inductive heating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101048021A CN101048021A (en) | 2007-10-03 |
| CN100534239C true CN100534239C (en) | 2009-08-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100154635A Active CN100534239C (en) | 2007-04-30 | 2007-04-30 | Electromagnetic inductive heating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100534239C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107690207A (en) * | 2016-08-04 | 2018-02-13 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker |
| CN106255248B (en) * | 2016-08-12 | 2023-06-06 | 四川华孚创科铁路设备有限公司 | Railway anchor heating device |
| CN108243525B (en) * | 2016-12-26 | 2024-01-23 | 佛山市顺德区美的电热电器制造有限公司 | Coil panel assembly and electromagnetic cooking utensil |
-
2007
- 2007-04-30 CN CNB2007100154635A patent/CN100534239C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101048021A (en) | 2007-10-03 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |