CN102711298A - Heating control device and control method for induction cooker - Google Patents
Heating control device and control method for induction cooker Download PDFInfo
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- CN102711298A CN102711298A CN2012101617809A CN201210161780A CN102711298A CN 102711298 A CN102711298 A CN 102711298A CN 2012101617809 A CN2012101617809 A CN 2012101617809A CN 201210161780 A CN201210161780 A CN 201210161780A CN 102711298 A CN102711298 A CN 102711298A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000006698 induction Effects 0.000 title abstract 3
- 230000000977 initiatory effect Effects 0.000 claims description 12
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 4
- 229910001006 Constantan Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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Abstract
The invention discloses a control method of heating power of an induction cooker.A microcontroller is respectively preset with a target pulse driving width Ton and a target resonant frequency f0 of each firepower gear, a frequency acquisition initial threshold value delta T and a frequency correction initial threshold value delta f; after the induction cooker starts to heat, the microcontroller starts to detect the current pulse driving width T, starts to acquire the current resonant frequency f of the resonant circuit when | T-Ton | < Δ T, and adjusts T according to the formula T' = -a (f-f0) + Ton when | f-f0| > Δ f. The invention adjusts the width of the driving pulse by taking the preset target resonant frequency as a reference, thereby controlling the power, and the invention has the advantages of simple and reliable control mode, small error of the heating power, stable heating power and good consistency of the heating power of the electromagnetic oven during batch production.
Description
Technical field
The present invention relates to a kind of electromagnetic oven field, be specifically related to a kind of electromagnetic oven heating control device and control method.。
Background technology
The control method of electromagnetic oven heating power is the current feedback mode in the market; In this method, microcontroller is gathered the conducting electric current of IGBT in real time, and this electric current is carried out processing and amplifying; Then according to the electric current adjustment pulsed drive width T after amplifying, the heating power of each gear of control electromagnetic oven.Because this method adopts constantan wire to gather the conducting electric current of IGBT; Receive the influence of a plurality of factors such as comprising constantan wire resistance, pin soldering tin amount, sample circuit PCB Copper Foil size, amplifier magnification ratio easily; Cause the sampling error of whole current feedback loop bigger; The precision of power control is not high, fluctuation is bigger, and the power consistency of producing the back product in batches is poor.
Summary of the invention
The objective of the invention is to consider the problems referred to above, a kind of power control precision is high, can effectively improve the electromagnetic oven heating power error a kind of electromagnetic oven heating control device and control method are provided.
The technical scheme that realizes the object of the invention is: a kind of electromagnetic oven heating control device; Comprise microcontroller, drive circuit, resonant circuit; The input of said microcontroller is connected with the output of resonant circuit; The output of microcontroller is connected with the input of drive circuit; The output of drive circuit is connected with the input of resonant circuit, also includes memory, timer, counter, comparator, timer in the said microcontroller, and parameter preset comprises in the said memory: the target pulse of firepower gear drives width Ton, target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f; Said timer is used to detect the current pulse width T of resonant circuit; Counter is gathered the current resonance frequency f of resonant circuit; Said comparator is used for comparison pulse width T and Ton, resonance frequency f and f0; Said timer is according to the pulse width T of comparative result adjustment resonant circuit.
Said timer, counter set are formed in the timer.
Also store correction parameter in the memory of said microcontroller, said correction parameter comprises positive threshold Δ T1, proofreaies and correct negative sense threshold value Δ T2.
The invention also discloses a kind of control method of electromagnetic oven heating control device, may further comprise the steps:
S1: the target pulse of preset respectively each firepower gear drives width Ton and target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f in the memory of microcontroller;
S2: during resonant circuit work, timer begins to detect the current pulsed drive width of resonant circuit T;
S3: the pulse width T that collects is sent to comparator, and comparator compares pulse width T and target pulse width Ton;
S4: when | T-Ton|≤Δ T, counter begins to gather the current resonance frequency f of resonant circuit, and the resonance frequency f that collects is sent to comparator, otherwise returns step S2;
S5: comparator compares pulse frequency f and target frequency f0;
S6: as | f-f0|>during Δ f, timer is adjusted pulse duration according to corrector T'=-a * (f – f0)+Ton; Otherwise return step S2; Wherein a is an arithmetic number.
Further, step S6) also comprise the more adjusted pulse width T of comparator ' and Ton, comprise following two kinds of situation:
1) as T'-Ton>0 the time, comparator is with the difference of T' – Ton and positive threshold Δ T1 relatively; If T'-Ton≤Δ T1, then (f-f0)+Ton adjust pulse duration, adjusts pulse duration otherwise press T''=Ton+ Δ T1 timer by formula T''=-a *;
2) < 0 the time, comparator with the difference of T' – Ton and negative sense threshold value Δ T2 relatively as T'-Ton; If T-Ton>Δ T2, timer is then by formula T''=-a * (f-f0)+Ton adjustment T value; Otherwise press T''=Ton+ Δ T2 adjustment pulse duration.
The invention has the beneficial effects as follows: be the driving pulse width of benchmark adjustment resonant circuit with predefined target pulse width and target resonance frequency; Control method is simple and reliable; With traditional comparing, effectively avoided constantan wire, PCB Copper Foil size, the amplifier portion current sample error effect that factor is brought that grades according to IGBT conducting Current Feedback Control mode; And be set with initial collection threshold value and secondary corrected threshold in the control procedure, and improved the precision of power control greatly, power stability, the power consistency during batch process is good.
Description of drawings
Fig. 1 is the structured flowchart of control device of the present invention;
Fig. 2 is the circuit theory diagrams of control device of the present invention;
Fig. 3 is the program flow diagram of control method of the present invention;
Fig. 4 is the correction program flow chart of control method of the present invention.
Embodiment
Do further detailed explanation below in conjunction with embodiment and accompanying drawing specific embodiments of the invention.
As shown in Figure 1; In the embodiment of the invention one; The control device of electromagnetic oven heating power comprises: microcontroller 1, drive circuit 2, resonant circuit 3; Line voltage is connected with resonant circuit 3 inputs through behind the rectifying and wave-filtering, and drive circuit 2, resonant circuit 3 are connected with the input of microcontroller 1 respectively, and the output of microcontroller 1 is connected with the input of drive circuit 2; The output of drive circuit 2 is connected with the output of resonant circuit 3, in microcontroller 1, also includes memory 11, timer 12, counter 13, comparator 14, timer 15.
Parameter preset comprises in memory 11: the target pulse of firepower gear drives width Ton, target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f;
Timer 12 is used to detect the current pulse width T of resonant circuit 3;
Counter 13 is gathered the current resonance frequency f of resonant circuit 3;
Comparator 14 is used for comparison pulse width T and Ton, resonance frequency f and f0;
Timer 15 is according to the pulse width T of comparative result adjustment resonant circuit 3.
As shown in Figure 2; The alternating current of 220V is behind rectifying and wave-filtering; To drive circuit 2, resonant circuit 3 power supplies, resonant circuit 3 wherein comprises resonant capacitance C1, coil panel L1, divider resistance R1, R2, R3, R4 respectively, and 1 pin of resonant capacitance C1 is connected with an end of resistance R 3; The other end of resistance R 3 is connected with an input of resistance R 4, microcontroller 1 respectively, the other end ground connection of resistance R 4; 2 pin of resonant capacitance C1 are connected with resistance R 1, and the other end of resistance R 1 is connected with another input of resistance R 2, microcontroller 1 respectively, the other end ground connection of resistance R 2.Microcontroller 1 divided by the sampling period, draws current resonance frequency f through the output umber of pulse of the inner integrated comparator of collection self.Microcontroller 1 is to 2 drive signals of drive circuit.
In another embodiment of the present invention, timer 12, counter 13 are integrated in the timer 15.
As shown in Figure 3, the control method of electromagnetic oven heating power provided by the invention may further comprise the steps:
S1: the target pulse of preset respectively each firepower gear drives width Ton and target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f in the memory 11 of microcontroller 1;
S2: during resonant circuit 3 work, timer 12 begins to detect resonant circuit 3 current pulsed drive width T;
S3: the pulse width T that collects is sent to comparator 14, and comparator 14 compares pulse width T and target pulse width Ton;
S4: when | T-Ton|≤Δ T, counter 13 begins to gather the current resonance frequency f of resonant circuit 3, and the resonance frequency f that collects is sent to comparator 14, otherwise returns step S2;
S5: comparator 14 compares pulse frequency f and target frequency f0;
S6: as | f-f0|>during Δ f, timer 15 is adjusted T according to corrector T'=-a * (f – f0)+Ton; Otherwise return step S2; Wherein a is an arithmetic number.
In another embodiment of the present invention, also store correction parameter in the memory 11 of microcontroller 1, said correction parameter comprises positive threshold Δ T1, proofreaies and correct negative sense threshold value Δ T2.
As shown in Figure 4, the step S6 of the control method of electromagnetic oven heating control device) also comprise comparator 14 more adjusted pulse width T ' and Ton, comprise following two kinds of situation:
1) as T'-Ton>0 the time, comparator 14 is with the difference of T' – Ton and positive threshold Δ T1 relatively; If T'-Ton≤Δ T1, (f-f0)+Ton adjust pulse duration, adjusts pulse duration otherwise press T''=Ton+ Δ T1 by formula T''=-a * for 15 of timers;
2) < 0 the time, comparator 14 with the difference of T' – Ton and negative sense threshold value Δ T2 relatively as T'-Ton; If T-Ton>Δ T2,15 of timers are by formula T''=-a * (f-f0)+Ton adjustment T value; Otherwise press T''=Ton+ Δ T2 adjustment pulse duration.
Wherein, the influence of choosing the target power, frequency sampling cycle and the heating topological structure that receive different firepower gears of a, Δ f, Δ T, Δ T1, Δ T2 numerical value can be with concrete designing requirement debugging; In the present embodiment, firepower gear power is 1600 ~ 1800W, and the sampling period of frequency f is 0.1 ~ 1s, Δ f (10,100), Δ T (0,3), Δ T1 (5,20), Δ T2 (50 ,-5), a (0,0.50).
Claims (5)
1. electromagnetic oven heating control device; Comprise microcontroller (1), drive circuit (2), resonant circuit (3); The input of said microcontroller (1) is connected with the output of resonant circuit (3); The output of microcontroller (1) is connected with the input of drive circuit (2); The output of drive circuit (2) is connected with the input of resonant circuit (3); It is characterized in that also including in the said microcontroller (1) memory (11), timer (12), counter (13), comparator (14), timer (15), the interior parameter preset of said memory (11) comprises: the target pulse of firepower gear drives width Ton, target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f; Said timer (12) is used to detect the current pulse width T of resonant circuit (3); Counter (13) is gathered the current resonance frequency f of resonant circuit (3); Said comparator (14) is used for comparison pulse width T and Ton, resonance frequency f and f0; Said timer (15) is according to the pulse width T of comparative result adjustment resonant circuit (3).
2. according to the said electromagnetic oven heating control device of claim 1, it is characterized in that said timer (12), counter (13) are integrated in the timer (15).
3. according to the said electromagnetic oven heating control device of claim 1, it is characterized in that also storing correction parameter in the memory (11) of said microcontroller (1), said correction parameter comprises positive threshold Δ T1, proofreaies and correct negative sense threshold value Δ T2.
4. the control method of an electromagnetic oven heating control device is characterized in that may further comprise the steps:
S1: the target pulse of preset respectively each firepower gear drives width Ton and target resonance frequency f0, frequency collection initiation threshold Δ T, frequency correction initiation threshold Δ f in the memory (11) of microcontroller (1);
S2: during resonant circuit (3) work, timer (12) begins to detect the current pulsed drive width of resonant circuit (3) T;
S3: the pulse width T that collects is sent to comparator (14), and comparator (14) compares pulse width T and target pulse width Ton;
S4: when | T-Ton|≤Δ T, counter (13) begins to gather the current resonance frequency f of resonant circuit (3), and the resonance frequency f that collects is sent to comparator (14), otherwise returns step S2;
S5: comparator (14) compares pulse frequency f and target frequency f0;
S6: as | f-f0|>during Δ f, timer (15) is adjusted pulse duration according to corrector T'=-a * (f – f0)+Ton; Otherwise return step S2; Wherein a is an arithmetic number.
5. the control method of electromagnetic oven heating control device according to claim 4 is characterized in that said step S6) also comprise the more adjusted pulse width T of comparator (14) ' and Ton, comprise following two kinds of situation:
1) as T'-Ton>0 the time, comparator (14) is with the difference of T' – Ton and positive threshold Δ T1 relatively; If T'-Ton≤Δ T1, then (f-f0)+Ton adjust pulse duration, adjusts pulse duration otherwise press T''=Ton+ Δ T1 timer (15) by formula T''=-a *;
2) < 0 the time, comparator (14) with the difference of T' – Ton and negative sense threshold value Δ T2 relatively as T'-Ton; If T-Ton>Δ T2, timer (15) is then by formula T''=-a * (f-f0)+Ton adjustment T value; Otherwise press T''=Ton+ Δ T2 adjustment pulse duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210161780.9A CN102711298B (en) | 2012-05-23 | 2012-05-23 | Heating control device of induction cooker and control method |
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| CN201210161780.9A CN102711298B (en) | 2012-05-23 | 2012-05-23 | Heating control device of induction cooker and control method |
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| CN102711298A true CN102711298A (en) | 2012-10-03 |
| CN102711298B CN102711298B (en) | 2014-01-01 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107535019A (en) * | 2015-05-07 | 2018-01-02 | 伊莱克斯家用电器股份公司 | For the method for the power control circuit for calibrating induced cooking utensils |
| CN108076544A (en) * | 2016-11-15 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Resonant frequency control method, resonant frequency control device and electromagnetic heating system |
| CN108072063A (en) * | 2016-11-16 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | A kind of electromagnetic heater Poewr control method and device and electromagnetic oven |
| CN108720549A (en) * | 2018-03-23 | 2018-11-02 | 浙江苏泊尔家电制造有限公司 | A kind of cooker and its firepower control method |
| CN109511188A (en) * | 2017-09-14 | 2019-03-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater, electromagnetic heating system and its control method |
| CN109640424A (en) * | 2018-12-18 | 2019-04-16 | 珠海格力电器股份有限公司 | A kind of electromagnetic heating system method for detecting abnormality, device and readable storage medium storing program for executing |
| CN109695899A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its heating power bearing calibration and device |
| CN109951908A (en) * | 2017-12-21 | 2019-06-28 | 佛山市顺德区美的电热电器制造有限公司 | The drive control circuit and drive control method of electromagnetic heating system and its IGBT |
| CN111244887A (en) * | 2020-03-05 | 2020-06-05 | 深圳市鑫汇科股份有限公司 | Protection circuit and surge detection method |
| CN111385928A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device of electromagnetic heating appliance and electromagnetic heating appliance |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107535019A (en) * | 2015-05-07 | 2018-01-02 | 伊莱克斯家用电器股份公司 | For the method for the power control circuit for calibrating induced cooking utensils |
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| CN108072063B (en) * | 2016-11-16 | 2019-05-03 | 佛山市顺德区美的电热电器制造有限公司 | A kind of electromagnetic heater Poewr control method and device and electromagnetic oven |
| CN108072063A (en) * | 2016-11-16 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | A kind of electromagnetic heater Poewr control method and device and electromagnetic oven |
| CN109511188A (en) * | 2017-09-14 | 2019-03-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater, electromagnetic heating system and its control method |
| CN109695899B (en) * | 2017-10-24 | 2020-03-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and heating power correction method and device thereof |
| CN109695899A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its heating power bearing calibration and device |
| CN109951908A (en) * | 2017-12-21 | 2019-06-28 | 佛山市顺德区美的电热电器制造有限公司 | The drive control circuit and drive control method of electromagnetic heating system and its IGBT |
| CN109951908B (en) * | 2017-12-21 | 2021-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and IGBT drive control circuit and drive control method thereof |
| CN108720549A (en) * | 2018-03-23 | 2018-11-02 | 浙江苏泊尔家电制造有限公司 | A kind of cooker and its firepower control method |
| CN109640424A (en) * | 2018-12-18 | 2019-04-16 | 珠海格力电器股份有限公司 | A kind of electromagnetic heating system method for detecting abnormality, device and readable storage medium storing program for executing |
| CN111385928A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device of electromagnetic heating appliance and electromagnetic heating appliance |
| CN111385928B (en) * | 2018-12-29 | 2021-12-21 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device of electromagnetic heating appliance and electromagnetic heating appliance |
| CN111244887A (en) * | 2020-03-05 | 2020-06-05 | 深圳市鑫汇科股份有限公司 | Protection circuit and surge detection method |
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