CN105485734B - Pot system is examined in electromagnetic oven total digitalization pulse - Google Patents
Pot system is examined in electromagnetic oven total digitalization pulse Download PDFInfo
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- CN105485734B CN105485734B CN201510978832.5A CN201510978832A CN105485734B CN 105485734 B CN105485734 B CN 105485734B CN 201510978832 A CN201510978832 A CN 201510978832A CN 105485734 B CN105485734 B CN 105485734B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
Abstract
Pot system is examined in electromagnetic oven total digitalization pulse, including LC resonant elements, control circuit and DSP module, control circuit sends pulse excitation to LC resonant elements, lc unit produces resonance current, the ADC for high-speed sampling is provided with DSP module, ADC records sampling harmonic current waveform, software chip is additionally provided with control circuit, for analyzing resonance current waveform, realize that the analysis to resonance current waveform obtains testing result by software chip algorithm.The invention has the advantages that：Simplify hardware interface circuit, it is cost-effective, reliability is improved, identifies resonant frequency, detects current sensor faults, detection coil disk open fault.
Description
Technical field
The invention belongs to household appliance technical field, and in particular to pot system is examined in electromagnetic oven total digitalization pulse.
Background technology
Modern electromagnetic oven, considers for the easy to use of people everywhere, is adapted to most of commercial
The pan in kitchen is wide in variety, and purchase approach is convenient, but therefore occur irrational pan be used in it is high-power
Situation on commercial induction cooker, it is ensured that the normal table of high-power commercial electromagnetic stove work, certain requirement is provided with to pot,
The pan that high-power commercial electromagnetic stove uses must be iron pan or have certain iron-holder, can just be operated in normal table
In the state of, not possessing iron-holder or the few pan of iron-holder has certain injury to high-power commercial electromagnetic stove, influences electromagnetism
The service life of stove.
Pulse detection pan is had been widely used in various electromagnetic oven schemes, its principle be by main control circuit, to
LC resonant elements（That is coil panel and resonant capacitance）A pulse excitation is sent, then lc unit just has oscillating current generation, leads to
Cross the response of detecting resonance current, it is possible to determine whether pot.
Traditional scheme is mainly by the signal of current sensor by the way that compared with analog comparator, current sample is believed
Number digit pulse is converted into, is counted by single-chip microcomputer, so as to determine whether pot.
The weak point of this method is：
（1）Resonance current sampled signal, is easily interfered, and comparator oscillating impulse may false triggering；
（2）Because resonance current is high-frequency signal, the requirement to analog comparator is higher, cost can be caused to increase；
（3）Pan species is difficult to, it is bad to the applicability of the pot of unlike material；
（4）It can not judge whether resonance current sensor is abnormal；
（5）It can not judge that coil panel is opened a way.
The content of the invention
For deficiency of the prior art, the present invention provides electromagnetic oven total digitalization pulse inspection pot system, to solve to pass through
The mode that analog line and main control chip combine, hardware circuit is complicated, is easily disturbed, and cost is high, it is impossible to identifies pan.
The present invention is achieved through the following technical solutions.
Pot system, including LC resonant elements, control circuit and DSP module, described control are examined in electromagnetic oven total digitalization pulse
Circuit processed sends pulse excitation to LC resonant elements, and lc unit produces resonance current, is provided with described DSP module for height
The ADC of speed sampling, it is characterised in that：Described ADC record sampling harmonic current waveform, described control circuit
On be additionally provided with software chip, for analyzing resonance current waveform, realized by software chip algorithm to resonance current waveform
Analysis obtain testing result, it is as follows the step of algorithm：
（1）Complete collection：After the multiple carrier cycles of continuous sampling, the waveform of analytical sampling, the waveform of sampling reaches
At 60 times, reappear response curve, rear accuracy rate is employed many times and improves, as long as sampling number is more than more than 60 times after experiment repeatedly
Response curve is stablized accurate；
（2）Setup parameter：The amplitude of waveform is set by response curve, according to the power setting threshold of electromagnetic oven itself
Value, passes through amplitude and the mathematic interpolation resonance current number of oscillation of threshold value；
（3）Decision circuitry：
（a）When the amplitude of resonance current waveform is more than threshold value, then it is assumed that be effectively to vibrate, the number of oscillation calculated, when shaking
Swing within the scope of 2 times to 6 times of number, then it is assumed that have pot, the scope of 2 times to 6 times is also by obtained by many experiments data；
（b）If the number of oscillation exceedes the scope of 2 times to 6 times of setting, but during less than maximum setting 11 times, if after waveform
Phase oscillation amplitude decays, then has been also considered as pot；
（c）If（a）（b）All it is unsatisfactory for, then it is assumed that without pot；
（d）If the number of oscillation is more than maximum setting 11 times, or when waveform is random, coil panel open circuit or sensor
It is abnormal.
Compared with prior art：Simplify hardware interface circuit, it is cost-effective, reliability is improved, identifies resonant frequency, detection
Current sensor faults, detection coil disk open fault.
Brief description of the drawings
Fig. 1 is the resonance current oscillogram under the single pulse excitation of the present invention.
Fig. 2 is the inspection pot block diagram of the traditional scheme of the present invention.
Fig. 3 is high-speed ADC sampled result when the present invention normal has pot.
Fig. 4 is the waveform analysis algorithm flow chart of the present invention.
Fig. 5 is the all-digital detection block diagram of the present invention.
Fig. 6 be the present invention without pot when oscillogram.
Fig. 7 is the oscillogram of the normal pan of the present invention.
Fig. 8 is the oscillogram of the stainless-steel pan of the present invention.
Embodiment
Below in conjunction with the accompanying drawings with embodiment, the present invention is described further.
Pot system, including LC resonant elements, control circuit and DSP module, described control are examined in electromagnetic oven total digitalization pulse
Circuit processed sends pulse excitation to LC resonant elements, and lc unit produces resonance current, is provided with described DSP module for height
The ADC of speed sampling, it is characterised in that：Described ADC record sampling harmonic current waveform, described control circuit
On be additionally provided with software chip, for analyzing resonance current waveform, realized by software chip algorithm to resonance current waveform
Analysis obtain testing result, it is as follows the step of algorithm：
（1）Complete collection：After the multiple carrier cycles of continuous sampling, the waveform of analytical sampling, the waveform of sampling reaches
At 60 times, reappear response curve；
（2）Setup parameter：The amplitude of waveform is set by response curve, according to the power setting threshold of electromagnetic oven itself
Value, passes through amplitude and the mathematic interpolation resonance current number of oscillation of threshold value；
（3）Decision circuitry：
（a）When the amplitude of resonance current waveform is more than threshold value, then it is assumed that be effectively to vibrate, the number of oscillation calculated, when shaking
Swing within the scope of 2 times to 6 times of number, then it is assumed that have pot；
（b）If the number of oscillation exceedes the scope of 2 times to 6 times of setting, but during less than maximum setting 11 times, if after waveform
Phase oscillation amplitude decays, then has been also considered as pot；
（c）If（a）（b）All it is unsatisfactory for, then it is assumed that without pot；
（d）If the number of oscillation is more than maximum setting 11 times, or when waveform is random, coil panel open circuit or sensor
It is abnormal.
Pot system is examined in electromagnetic oven total digitalization pulse, can not only delete analog comparator, is simplified circuit structure, is saved into
Originally, the shortcomings that and can overcoming conventional method, due to no longer needing analog comparator, then current sampling signal can directly connect
DSP ADC entrances are connected to, circuit is greatly simplified, sampled by high-speed ADC, while within a period of time, continuous record sampling ripple
Shape, as long as the point of sampling is enough, then it can reappear response curve, Fig. 4 is exactly the current wave recorded by high-speed sampling
Shape, the resonance current waveform recorded is true, available for waveform analysis.
The effective number of oscillation of positive and negative zero passage 8 times in Fig. 6, amplitude is substantially undamped, can not heat, and the positive and negative zero passages of Fig. 7 are effective
The number of oscillation 3, the positive and negative effectively numbers of oscillation of Fig. 89 times, amplitude has obvious decay, can heat.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's
Protection domain.
Claims (1)
1. pot system, including LC resonant elements, control circuit and DSP module, described control are examined in electromagnetic oven total digitalization pulse
Circuit sends pulse excitation to LC resonant elements, and lc unit produces resonance current, is provided with described DSP module at a high speed
The ADC of sampling, it is characterised in that：Described ADC records sampling harmonic current waveform, is gone back in described control circuit
Software chip is provided with, for analyzing resonance current waveform, resonance current waveform is divided to realize by software chip algorithm
Analysis obtains testing result, as follows the step of algorithm：
（1）Complete collection：After the multiple carrier cycles of continuous sampling, the waveform of analytical sampling, the waveform of sampling reaches 60 times
When, reappear response curve；
（2）Setup parameter：The amplitude of waveform is set by response curve, according to the power setting threshold value of electromagnetic oven itself,
Pass through amplitude and the mathematic interpolation resonance current number of oscillation of threshold value；
（3）Decision circuitry：
（a）When the amplitude of resonance current waveform is more than threshold value, then it is assumed that be effectively to vibrate, calculate the number of oscillation, when vibration time
Within the scope of several 2 times to 6 times, then it is assumed that have pot；
（b）If the number of oscillation exceedes the scope of 2 times to 6 times of setting, but during less than maximum setting 11 times, if the waveform later stage shakes
Amplitude attenuation is swung, then has been also considered as pot；
（c）If（a）（b）All it is unsatisfactory for, then it is assumed that without pot；
（d）If the number of oscillation is more than maximum setting 11 times, or when waveform is random, coil panel open circuit or sensor are different
Often.
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| CN201510978832.5A CN105485734B (en) | 2015-12-24 | 2015-12-24 | Pot system is examined in electromagnetic oven total digitalization pulse |
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| CN201510978832.5A CN105485734B (en) | 2015-12-24 | 2015-12-24 | Pot system is examined in electromagnetic oven total digitalization pulse |
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| CN105485734A CN105485734A (en) | 2016-04-13 |
| CN105485734B true CN105485734B (en) | 2018-02-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109870616B (en) * | 2017-12-05 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Peak value taking circuit, control circuit, cooking utensil and method for judging type of cookware |
| CN111214099A (en) * | 2019-10-23 | 2020-06-02 | 浙江苏泊尔家电制造有限公司 | Cooking utensil |
| CN112859647B (en) * | 2019-11-27 | 2022-02-25 | 佛山市顺德区美的电热电器制造有限公司 | Cooking curve adjusting method and device, household appliance and storage medium |
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| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
| CN201532446U (en) * | 2009-07-09 | 2010-07-21 | 山东艾诺仪器有限公司 | Battery inherent resistance testing device |
| CN101909375A (en) * | 2009-06-08 | 2010-12-08 | 深圳市鑫汇科科技有限公司 | High-power electromagnetic oven circuit based on SoC (System On Chip) chip |
| CN102905411A (en) * | 2012-10-17 | 2013-01-30 | 美的集团股份有限公司 | Control circuit for cookware material judgment and method thereof |
| CN104214804A (en) * | 2014-09-15 | 2014-12-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and cookware detecting method thereof |
| CN104597356A (en) * | 2015-01-30 | 2015-05-06 | 广东美的厨房电器制造有限公司 | Cookware detection method and device used for cooking utensil |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
| CN101909375A (en) * | 2009-06-08 | 2010-12-08 | 深圳市鑫汇科科技有限公司 | High-power electromagnetic oven circuit based on SoC (System On Chip) chip |
| CN201532446U (en) * | 2009-07-09 | 2010-07-21 | 山东艾诺仪器有限公司 | Battery inherent resistance testing device |
| CN102905411A (en) * | 2012-10-17 | 2013-01-30 | 美的集团股份有限公司 | Control circuit for cookware material judgment and method thereof |
| CN104214804A (en) * | 2014-09-15 | 2014-12-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and cookware detecting method thereof |
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| CN105485734A (en) | 2016-04-13 |
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Effective date of registration: 20190904 Address after: 315806 No. 26 Dayao Yongjiang South Road, Beilun District, Ningbo City, Zhejiang Province (Ningbo Deye Frequency Conversion Technology Co., Ltd.) Patentee after: Ningbo Deye Inverter Technology Co., Ltd. Address before: 315806 No. 18 Huapu Road, Beilun District, Ningbo City, Zhejiang Province Patentee before: NINGBO DEGAO SOFTWARE TECHNOLOGY CO., LTD. |