CN202425085U - Control circuit of induction cooker - Google Patents
Control circuit of induction cooker Download PDFInfo
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- CN202425085U CN202425085U CN2011205440616U CN201120544061U CN202425085U CN 202425085 U CN202425085 U CN 202425085U CN 2011205440616 U CN2011205440616 U CN 2011205440616U CN 201120544061 U CN201120544061 U CN 201120544061U CN 202425085 U CN202425085 U CN 202425085U
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Abstract
The utility model discloses a control circuit of an induction cooker. The control circuit comprises a driving module, a current detection module and a control module, wherein the driving module is used for generating a pulse width modulation (PWM) signal and outputting the signal to a switch device of the induction cooker; the current detection module is used for detecting the current value of the induction cooker; and the control module is respectively connected with the driving module and the current detection module and is used for adjusting the frequency of the PWM signal output by the driving module. When the current change value of the induction cooker, which is detected by the current detection module, is more than the preset threshold value, the control module enters a protection mode, and the frequency of the PWM signal is increased, so that the current value of the induction cooker is adjusted to the fixed value. By the control circuit, the induction cooker can be protected in a boiler lifting and moving process, and the current mutation in the boiler lifting and moving process and irreversible damage caused by the current mutation can be effectively avoided.
Description
Technical field
The utility model relates to household cookware, particularly a kind of electromagnetic oven control circuit.
Background technology
The Along with people's growth in the living standard, more and more electronic products get into daily life.For example, kitchen tools such as electromagnetic oven, electric rice cooker have become the indispensable instrument in the kitchen.Working principle of induction cooker is to produce alternating magnetic field through loading high-frequency alternating voltage on the coil, and excitation irony pan produces the electronics eddy current, thereby produces heat, is used for culinary art.The process that electromagnetic oven produces induction field is to realize the key of heating function.
But place and move under two kinds of situation opening at pan,, cause aircraft bombing easily, thereby very easily a plurality of Primary Components are caused damage, influence electromagnetic oven useful life and safety because the variation of induction area and distance causes the sudden change of electric current in coil and the circuit.
The utility model content
The utility model is intended to solve at least one of technical problem that exists in the prior art; A kind of electromagnetic oven control circuit of special proposition; This electromagnetic oven control circuit can be protected lifting a pot electromagnetic oven that moves in pot process, effectively avoids lifting the irreversible lesion that pot moves the current break in pot process and causes.
Be to realize above-mentioned purpose, the embodiment of the utility model provides a kind of electromagnetic oven Control current, comprising: driver module is used for production burst width modulated pwm signal and exports the switching device of said electromagnetic oven to; Current detection module is used to detect the current value of electromagnetic oven; Control module; Said control module links to each other with said current detection module with said driver module respectively; Said control module is adjusted the frequency of the pwm signal of said driver module output; And after the electric current changing value of the said electromagnetic oven that said current detection module detects surpassed predetermined threshold value, said control module got into protected mode, and the frequency that increases said pwm signal is adjusted to fixed value with the current value with said electromagnetic oven.
Electromagnetic oven control circuit according to the utility model embodiment; Can the electric current on the coil of electromagnetic oven be adjusted to fixed value through the power of adjusting the pwm signal of exporting; Thereby realize protecting, effectively avoid lifting the irreversible lesion that pot moves the current break in pot process and causes lifting a pot electromagnetic oven that moves in pot process.
Additional aspect of the utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.
Description of drawings
Above-mentioned and/or additional aspect of the utility model and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is the structured flowchart according to the electromagnetic oven control circuit of the utility model embodiment;
Fig. 2 is the circuit diagram according to the electromagnetic oven control circuit of the utility model embodiment;
Fig. 3 is according to the civil power detection module of the utility model embodiment and surge detects and the circuit diagram of processing module; And
Fig. 4 is that PWM voltage and the induced current according to the utility model embodiment concerns sketch map.
Embodiment
Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.
With reference to following description and accompanying drawing, with these and other aspects of the embodiment that knows the utility model.In these descriptions and accompanying drawing; Some specific implementations among the embodiment of the utility model are specifically disclosed; Represent to implement some modes of principle of the embodiment of the utility model, but the scope of embodiment that should be appreciated that the utility model is not limited.On the contrary, the embodiment of the utility model comprises and falls into appended spirit that adds the right claim and all changes, modification and the equivalent in the intension scope.
Referring to figs. 1 to Fig. 4 the electromagnetic oven control circuit 100 according to the utility model embodiment is described below.
As shown in Figure 1, the electromagnetic oven control circuit 100 that the utility model embodiment provides comprises driver module 110, current detection module 120 and control module 130.Wherein, Driver module 110 is used for production burst width adjustment pwm signal and exports the switching device of electromagnetic oven to; Current detection module 120 is used to detect the current value of electromagnetic oven; Control module 130 links to each other with current detection module 120 with driver module 110 respectively; Be used to adjust the frequency of the pwm signal of driver module 110 outputs, and after the electric current changing value of the electromagnetic oven that current detection module 120 detects surpasses predetermined threshold value, get into protected mode, and the frequency of increase pwm signal is to adjust to fixed value with the current value of electromagnetic oven.
As shown in Figure 2, driver module 110 comprises first resistance R 23, the first triode Q4, second resistance R 22, the second triode Q2, the 3rd resistance R 21, the 3rd triode Q1, the 4th triode Q3.Particularly, an end of first resistance R 23 links to each other with power supply, and the other end links to each other with the collector electrode of the first triode Q4, and the base stage of the first triode Q4 links to each other grounded emitter through the 4th resistance R 35 with control module 130.Between the base stage of the first triode Q4 and emitter, be parallel with the 5th resistance R 24.One end of second resistance R 22 links to each other with power supply.The base stage of the second triode Q2 links to each other with the first triode Q4 collector electrode, and collector electrode links to each other grounded emitter with the other end of second resistance R 22.One end of the 3rd resistance R 21 links to each other with power supply, and the other end links to each other with the collector electrode of the 3rd triode Q1, and the base stage of the 3rd triode Q1 links to each other with the collector electrode of the second triode Q2, and the emitter of the 3rd triode Q1 links to each other with the emitter of the 4th triode Q3.The base stage of the 4th triode Q3 links to each other with the collector electrode of the second triode Q2, the grounded collector of the 4th triode Q3.And the emitter of the 3rd triode Q1 and the 4th triode Q3 all links to each other with switching device.Particularly, the emitter of the 3rd triode Q1 and the 4th triode Q3 links to each other with an end of the 6th resistance R 25, and the other end of the 6th resistance R 25 links to each other with switching device.Between switching device and ground, be parallel with the 7th resistance R 26 and voltage stabilizing didoe DW1.
Wherein, power supply can be 18V, on power supply, is parallel with the electrochemical capacitor EC29 and first capacitor C 10; The resistance of first resistance R 23 can be 10K, and the resistance of second resistance R 22 can be 3.2K, and the resistance of the 3rd resistance R 21 can be 10K; The resistance of the 4th resistance R 35 can be 3.3K; The resistance of the 5th resistance R 24 can be 1K, and the parameter of the 6th resistance R 25 is 10R/0.5W, and the resistance of the 7th resistance R 26 can be 10K.The rated voltage of voltage stabilizing didoe DW1 is 18V.
In an embodiment of the utility model, switching device is IGBT (Insulated Gate Bipolar Transistor, an insulated gate bipolar transistor).Wherein, as shown in Figure 2, the base stage of switching device IGBT links to each other with driver module 110, and emitter links to each other with current detection module 120 with the LIN end of the heater coil of electromagnetic oven respectively, and collector electrode is held with the LOUT of the heater coil of electromagnetic oven and linked to each other.The emitter of switching device IGBT detects current value with current detection module 120 and exports control module 130 to, and control module 130 is according to the pwm signal of these current value adjustment driver module 120 outputs.The base stage of switching device IGBT under the driving of the adjusted pwm signal of driver module 120 output, saturation conduction.At this moment, the LIN of heater coil end is " just ",, the LOUT end of heater coil is " bearing ".Under the control of pwm signal, not can not undergo mutation on the induction coil.
Current detection module 120 is used to detect the current value of electromagnetic oven.In an instance of the utility model, current detection module 120 can be constantan wire.Wherein, constantan wire is arranged on the emitter of IGBT pipe.Wherein, the internal resistance of constantan wire is less.Current detection module 120 can be gathered the current value on the induction coil of electromagnetic oven, wherein, and electric current set 5-10A.Current detection module 120 exports this current value to control module 130, as the current reference variable.
In an embodiment of the utility model; The electromagnetic oven control circuit 100 of the utility model embodiment also comprises civil power detection module 140; Wherein, Civil power detection module 140 links to each other with control module 130, is used to detect current line voltage, and current line voltage is fed back to control module 120.As shown in Figure 3, civil power detection module 140 comprises the 8th resistance R 27, the 9th resistance R 28 and the tenth resistance R 29, and wherein, UAD is the line voltage acquisition port.Wherein, an end ground connection of the 8th resistance R 27, the other end links to each other with an end of the 9th resistance R 28, and the other end of the 9th resistance R 28 links to each other with the tenth resistance R 29.The resistance of the 8th resistance R 27 can be 8.2K, and the parameter of the 9th resistance R 28 can be 10K/25W, and the parameter of the tenth resistance R 29 can be 330K/0.5W.The voltage of the other end that links to each other with the UAD acquisition port of the 8th resistance R 27 is 3.08V.
Civil power detection module 140 is all-wave through being connected across the first diode D1 and the second diode D2 of fire on 0 two lines with the commercial power rectification, is input to the UAD mouth through the 8th resistance R 27, the 9th resistance R 28, the tenth resistance R 29 and the 11 resistance R 30 dividing potential drops then.Because line voltage is unstable, according to electromagnetic oven safety and industry standard requirement, electromagnetic oven all needs operate as normal in 110V one 270V wide-voltage range.Can collect line voltage through above-mentioned UAD mouth and divider resistance.
In an embodiment of the utility model; The electromagnetic oven control circuit 100 of the utility model embodiment comprises that also surge detects and processing module 150; Link to each other with civil power detection module 140, be used for when detecting line voltage generation surge, surge being carried out filtering to eliminate the surge that produces.As shown in Figure 3, surge detects and processing module 150 comprises the 12 resistance R 31, second capacitor C the 2, the 13 resistance R the 32, the 14 resistance R 33, the 3rd capacitor C 7 and the 3rd diode D4.Wherein, The 12 resistance R 31 and second capacitor C 2 are connected in parallel; The 12 resistance R 31 all links to each other with the 11 resistance R 30 with an end of second capacitor C 2; The 12 resistance R 31 all links to each other the other end ground connection of the 13 resistance R 32 with the other end of second capacitor C 2 with an end of the 13 resistance R 32.One end of the 13 resistance R 32 also links to each other with an end of the 14 resistance R 33.The other end of the 14 resistance R 33 links to each other with control module 130 with an end of the 3rd electric capacity, the positive terminal of the 3rd diode respectively, the other end ground connection of the 3rd electric capacity, the negative pole termination+5V power supply of the 3rd diode.
If the electric current changing value of the electromagnetic oven that current detection module 120 detects does not surpass predetermined threshold value, then control module 130 gets into normal mode.Particularly, control module 130 can be adjusted the frequency of the pwm signal of driver module 110 outputs according to the current gear of the current value of current line voltage, electromagnetic oven and electromagnetic oven when normal mode.
Move in pot process lifting pot, when pan puts down and moves in the process of optimum position, because the electromagnetic induction area constantly increases, induced current increases simultaneously on the coil.Because this process time is extremely short, thereby makes current changing rate bigger, electric current possibly reach big interval range simultaneously.When line voltage under the fixing situation of constant and power shelves; During like 2000 watts of gears, the induced current when the beginning pan is not responded to fully is very little, through the frequency of control module 130 adjusting PWM; Make that the PWM frequency is less; It is bigger that IGBT cut-offs the cycle, and can reach electric current and voltage product is fixed value, and promptly the realtime power of electromagnetic oven is a fixed value.When pan loaded fully in moment, induction area increased and the electric current instant becomes big, but the control signal of PWM does not also return to the state of adjustment electric current, thereby made the electric current instant value very big.The current value that detects electromagnetic oven when current detection module 120 alters a great deal at short notice, and after the electric current changing value surpassed predetermined threshold value, then control module 130 got into protected modes.Wherein, under protected mode, though pan puts down and moving process in induction area can increase suddenly, the electric current of responding to can not suddenly change, thereby can realize the effective protection to pan and IGBT device.Workflow in the face of protected mode describes down.Under protected mode, control module 130 increases the output frequency of pwm signals, makes that the current value on the coil of electromagnetic oven is adjusted at a lower fixed value.At this moment, the frequency of the pwm signal of control module 130 outputs is higher, the frequent pipeline section of IGBT, thus reduced heating power.In an example of the present invention, the desired value that fixed value can be provided with for control module 130 in advance.Control module 130 increases the output frequency of pwm signal according to this fixed value that is provided with in advance.
Fig. 3 is PWM voltage and faradic relation.Under protected mode, even induction area increases suddenly, the waveform of PWM is still fixing, and then induced current can not suddenly change, and has protected IGBT and related device effectively.
When the pwm signal frequency of control module 130 outputs was hanged down, the pulsewidth of PWM ripple was bigger, and this moment, the ON time of IGBT was longer; Make the also variation of the time that discharges and recharges of induction coil; Thereby make crest voltage bigger, electric current is also bigger on the coil, reaches the purpose of regulating heating power.
Electromagnetic oven control circuit according to the utility model embodiment; Can the electric current on the coil of electromagnetic oven be adjusted to fixed value through the power of adjusting the pwm signal of exporting; Thereby realize protecting, effectively avoid lifting the irreversible lesion that pot moves the current break in pot process and causes lifting a pot electromagnetic oven that moves in pot process.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained among at least one embodiment or example of the utility model.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described the embodiment of the utility model; Those having ordinary skill in the art will appreciate that: under the situation of principle that does not break away from the utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, the scope of the utility model is limited claim and equivalent thereof.
Claims (7)
1. an electromagnetic oven control circuit is characterized in that, comprising:
Driver module is used for production burst width modulated pwm signal and exports the switching device of said electromagnetic oven to;
Current detection module is used to detect the current value of electromagnetic oven;
Control module; Said control module links to each other with said current detection module with said driver module respectively; Said control module is adjusted the frequency of the pwm signal of said driver module output; And after the electric current changing value of the said electromagnetic oven that said current detection module detects surpassed predetermined threshold value, said control module got into protected mode, and the frequency that increases said pwm signal is adjusted to fixed value with the current value with said electromagnetic oven.
2. electromagnetic oven control circuit as claimed in claim 1 is characterized in that, also comprises:
The civil power detection module; Said civil power detection module detects current line voltage; And said current line voltage fed back to said control module, said control module is adjusted the frequency of the pwm signal of said driver module output according to the current gear of the current value of said current line voltage, said electromagnetic oven and said electromagnetic oven when normal mode.
3. electromagnetic oven control circuit as claimed in claim 2 is characterized in that, also comprises:
Surge detects and processing module, is used for when detecting said line voltage and produce surge, said surge being carried out filtering to eliminate said surge.
4. electromagnetic oven control circuit as claimed in claim 1 is characterized in that, said driver module comprises:
First resistance, an end of said first resistance links to each other with power supply;
First triode, the base stage of said first triode links to each other with said control module, and the collector electrode of said first triode links to each other with the other end of said first resistance, the grounded emitter of said first triode;
Second resistance, an end of said second resistance links to each other with power supply;
Second triode, the base stage of said second triode links to each other with the collector electrode of said first triode, and the collector electrode of said second triode links to each other with the other end of said second resistance, the grounded emitter of said second triode;
The 3rd resistance, an end of said the 3rd resistance links to each other with power supply;
The 3rd triode, the base stage of said the 3rd triode links to each other with the collector electrode of said second triode, and the collector electrode of said the 3rd triode links to each other with the other end of said the 3rd resistance;
The 4th triode; The base stage of said the 4th triode links to each other with the collector electrode of said second triode; The emitter of said the 4th triode links to each other with the emitter of said the 3rd triode; The grounded collector of said the 4th triode, wherein, the emitter of said the 3rd triode and said the 4th triode all links to each other with said switching device.
5. electromagnetic oven control circuit as claimed in claim 4 is characterized in that, said switching device is the insulated gate bipolar transistor IGBT pipe.
6. electromagnetic oven control circuit as claimed in claim 5 is characterized in that, said current detection module is a constantan wire.
7. electromagnetic oven control circuit as claimed in claim 6 is characterized in that, said constantan wire is arranged on the emitter of said IGBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205440616U CN202425085U (en) | 2011-12-22 | 2011-12-22 | Control circuit of induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205440616U CN202425085U (en) | 2011-12-22 | 2011-12-22 | Control circuit of induction cooker |
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|---|---|
| CN202425085U true CN202425085U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205440616U Expired - Fee Related CN202425085U (en) | 2011-12-22 | 2011-12-22 | Control circuit of induction cooker |
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| CN (1) | CN202425085U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902600A (en) * | 2014-03-06 | 2015-09-09 | 美的集团股份有限公司 | Electromagnetic heating device and control method thereof |
| CN108072905A (en) * | 2016-11-14 | 2018-05-25 | 广东美的生活电器制造有限公司 | For the inspection cup system and method and cooking machine of cooking machine |
| CN109688649A (en) * | 2017-10-19 | 2019-04-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus, electromagnetic heating system and its control method and device |
| CN110432748A (en) * | 2018-05-03 | 2019-11-12 | 佛山市顺德区美的电热电器制造有限公司 | Pan inspection method, device and equipment for electromagnetic heating appliances |
| CN113225863A (en) * | 2021-04-23 | 2021-08-06 | 江西省万佳通照明科技有限公司 | Driving integrated circuit of induction cooker |
| CN119827892A (en) * | 2025-03-20 | 2025-04-15 | 中国标准化研究院 | Cooking utensils energy efficiency test method and system based on artificial intelligence |
-
2011
- 2011-12-22 CN CN2011205440616U patent/CN202425085U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902600A (en) * | 2014-03-06 | 2015-09-09 | 美的集团股份有限公司 | Electromagnetic heating device and control method thereof |
| CN104902600B (en) * | 2014-03-06 | 2018-03-16 | 美的集团股份有限公司 | Electromagnetic heater and its control method |
| CN108072905A (en) * | 2016-11-14 | 2018-05-25 | 广东美的生活电器制造有限公司 | For the inspection cup system and method and cooking machine of cooking machine |
| CN109688649A (en) * | 2017-10-19 | 2019-04-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus, electromagnetic heating system and its control method and device |
| CN109688649B (en) * | 2017-10-19 | 2021-02-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, electromagnetic heating system and control method and device thereof |
| CN110432748A (en) * | 2018-05-03 | 2019-11-12 | 佛山市顺德区美的电热电器制造有限公司 | Pan inspection method, device and equipment for electromagnetic heating appliances |
| CN110432748B (en) * | 2018-05-03 | 2021-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Pot detection method, device and equipment of electromagnetic heating electric appliance |
| CN113225863A (en) * | 2021-04-23 | 2021-08-06 | 江西省万佳通照明科技有限公司 | Driving integrated circuit of induction cooker |
| CN113225863B (en) * | 2021-04-23 | 2023-07-14 | 江西省万佳通照明科技有限公司 | Electromagnetic oven driving integrated circuit |
| CN119827892A (en) * | 2025-03-20 | 2025-04-15 | 中国标准化研究院 | Cooking utensils energy efficiency test method and system based on artificial intelligence |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20151222 |
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| EXPY | Termination of patent right or utility model |