CN107990995A - A kind of method for measuring assessment vessel for electromagnetic cooker temperature - Google Patents
A kind of method for measuring assessment vessel for electromagnetic cooker temperature Download PDFInfo
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- CN107990995A CN107990995A CN201711276328.6A CN201711276328A CN107990995A CN 107990995 A CN107990995 A CN 107990995A CN 201711276328 A CN201711276328 A CN 201711276328A CN 107990995 A CN107990995 A CN 107990995A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
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Abstract
The present invention relates to a kind of method for measuring assessment vessel for electromagnetic cooker temperature, comprise the following steps：Step 1: if electromagnetic stove is using specific stainless steel or stainless steel interlayer electromagnetic cooker, then has correspondence between the harmonic period value and temperature of boiler in circuit；Step 2: in normal work, profit obtains harmonic period T with the aforedescribed process, and T is searched in thermograph form closest to cycle corresponding temperature t, it is believed that temperature t is the temperature of pot body；Step 3: assess relative temperature using cyclic curve, setting is to boil water to be automatically stopped or preservation and controlling.The beneficial effects of the invention are as follows：The boiling temperature and examinations holding temperature of assessment vessel for electromagnetic cooker can be accurately measured, effectively solves existing measurement Shortcomings part.
Description
Technical field
Present invention relates particularly to be a kind of method for measuring assessment vessel for electromagnetic cooker temperature.
Background technology
Alternating voltage is converted to direct current by electromagnetic oven by rectifier, and becomes direct current through RF power conversion equipment
For the high-frequency alternating current more than audio, high-frequency alternating current is added on the spiral helicine load coil L1 of flat, hollow, thus
Produce high-frequency alternating magnetic field.Its magnetic line of force penetrates the ceramic platen of hearth and acts on metal pan, and metal pan is equivalent to electricity at this time
Feel L2.Just there is powerful vortex to produce in cooking pan internal cause electromagnetic induction.Vortex completes electricity when overcoming the internal resistance of pot body to flow
Can be to the conversion of thermal energy, caused Joule heat is exactly the heat source cooked.The frequency of oscillation of electromagnetic stove is left generally in tens K
It is right.
At work, electromagnetic cooker is located on the ceramic platen of electromagnetic stove, it is difficult to directly be surveyed by temperature sensor
Measure the temperature of pot body.
The content of the invention
Present invention seek to address that technical problem existing in the prior art；For this reason, an object of the present invention is to provide
A kind of method for the measurement assessment vessel for electromagnetic cooker temperature that can be accurately measured assessment and solve existing measurement deficiency, and thus spread out
The automatic detection of raw water boiling point and heat insulation function.
A kind of method for measuring assessment vessel for electromagnetic cooker temperature according to the present invention, comprises the following steps：
Step 1: if electromagnetic stove is using specific stainless steel or stainless steel interlayer electromagnetic cooker, then the resonance in circuit
There is similar linear relationship between periodic quantity and temperature of boiler；
Step 2: in normal work, profit obtains harmonic period T with the aforedescribed process, and T is searched in thermograph form
Closest to cycle corresponding temperature t, it is believed that temperature t is the temperature of pot body；
Step 3: assess relative temperature using cyclic curve, setting is to boil water to be automatically stopped or preservation and controlling.
It is specific that further Step 1: by experiment, electromagnetic cooker is heated with electromagnetic stove, by the cooking bottom temperature of electromagnetic cooker by
T1 is heated to Tn, records temperature, and records the harmonic period under different temperatures, forms thermograph form；
It is specific further, it is described that to boil water to be automatically stopped temperature detection step as follows：
Step 1: the harmonic period T that detection is current；
Step 2: being searched in thermograph form, current immediate temperature t is obtained；
Step 3: whether immediate temperature t arrives boiling temperature.
Step 4: immediate temperature t reaches boiling temperature, stop heating or maintain small function heated condition.
Specific further, in the step 3, immediate temperature t detects to be less than boiling temperature, returns to step
In one, current harmonic period T is detected again.
Specific further, the preservation and controlling temperature detection step is as follows：
Step 1: the harmonic period T that detection is current；
Step 2: being searched in thermograph form, current immediate temperature t is obtained；
Step 3: calculate the difference △ t between Current Temperatures t and target temperature t_target；
Step 3: adjusting output power according to △ t carries out heat insulation function heating；
Step 4: whether heat insulation function heating terminates.
Specific further, heat insulation function is heated and not terminated also in the step 4, is returned in step 1, is detected again
Current harmonic period T.
It is specific further, when harmonic period is measured：By selecting switch, the power supply stable to inductance input swashs
Encourage, the free harmonic vibration cycle T of measurement inductive drop U.
It is specific further, in the cycle of measurement voltage free harmonic vibration：By voltage compared by inductive drop UL and Ud into
Row voltage compares, and exports square-wave signal, and the time of free harmonic vibration can be measured by single chip computer measurement square wave pulse width signal.
It is specific further, by measuring harmonic period T, judge stainless steel or stainless steel interlayer electromagnetic cooker temperature rise or
Decline, by adjusting electromagnetic oven power so that the stabilization of stainless steel or stainless steel interlayer electromagnetism pot temperature.
The beneficial effects of the invention are as follows：Searched by the detection in thermograph form, obtain current immediate temperature
Spend t and calculate the difference △ t between Current Temperatures t and target temperature t_target；Assessment vessel for electromagnetic cooker can be accurately measured
Boiling temperature and examinations holding temperature, effectively solve existing measurement Shortcomings part.In addition, by using stainless steel or
Harmonic period curve when stainless steel interlayer electromagnetic cooker is to boil water, can carry out judging water outlet boils judgement.
Brief description of the drawings
The present invention combines accompanying drawings below to will be apparent and be readily appreciated that in the description of embodiment.
Fig. 1 is the first circuit diagram of the present invention.
Fig. 2 is the power supply handoff procedure measurement harmonic period schematic diagram of Fig. 1.
Fig. 3 is the signal of inductive drop U3 free oscillations waveform.
Fig. 4 is the harmonic period schematic diagram of direct measurement inductive drop.
Fig. 5 is the circuit diagram for comparing measurement harmonic period using voltage of the present invention.
Fig. 6 is that the square-wave signal of inductive current, inductive drop and the voltage comparator output of Fig. 5 shows
It is intended to.
Fig. 7 is inductive drop waveform diagram.
Fig. 8 is the boiling point detecting step schematic diagram of the present invention.
Fig. 9 is the insulation detecting step schematic diagram of the present invention.
Figure 10 is the canonical process that water at room temperature is heated to boiling in electromagnetic stove, harmonic period and the relation of time
Schematic diagram.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to a kind of side of Fig. 1 to Figure 10 descriptions measurement assessment vessel for electromagnetic cooker temperature according to embodiments of the present invention
Method, comprises the following steps：
Step 1: if electromagnetic stove is using specific stainless steel or stainless steel interlayer electromagnetic cooker, then the resonance in circuit
There is similar linear relationship between periodic quantity and temperature of boiler；
Step 2: in normal work, profit obtains harmonic period T with the aforedescribed process, and T is searched in thermograph form
Closest to cycle corresponding temperature t, it is believed that temperature t is the temperature of pot body；
Step 3: assess relative temperature using cyclic curve, setting is to boil water to be automatically stopped or preservation and controlling.
As shown in Figure 10, wherein Step 2: also being heated electromagnetic cooker with electromagnetic stove, by the bottom of a pan of electromagnetic cooker by experiment
Temperature is heated to tn by t1, records temperature, and records the harmonic period under different temperatures, forms thermograph form.
As shown in figure 8, the invention discloses described to boil water to be automatically stopped temperature detection step as follows：
Step 1: the harmonic period T that detection is current；
Step 2: being searched in thermograph form, current immediate temperature t is obtained；
Step 3: whether immediate temperature t arrives boiling temperature.
Step 4: immediate temperature t reaches boiling temperature, stop heating or maintain small function heated condition.
Specific further, in the step 3, immediate temperature t detects to be less than boiling temperature, returns to step
In one, current harmonic period T is detected again.
As shown in figure 9, the invention discloses the preservation and controlling temperature detection step is as follows：
Step 1: the harmonic period T that detection is current；
Step 2: being searched in thermograph form, current immediate temperature t is obtained；
Step 3: calculate the difference △ t between Current Temperatures t and target temperature t_target；
Step 3: adjusting output function according to △ t carries out heat insulation function heating；
Step 4: whether heat insulation function heating terminates.
Specific further, heat insulation function is heated and not terminated also in the step 4, is returned in step 1, is detected again
Current harmonic period T.
It is specific further, when resonant frequency is measured：By selecting switch, the power supply stable to inductance input is swashed
Encourage, measure the free harmonic vibration cycle T of inductive drop U inductance.
It is specific further, in the time of measurement free harmonic vibration：Compared by voltage and inductive drop UL and Ud is subjected to electricity
Pressure ratio is compared with output square-wave signal, the free harmonic vibration cycle can be measured by single chip computer measurement square wave pulse width signal.
It is specific further, by measuring harmonic period T, judge stainless steel or stainless steel interlayer electromagnetic cooker temperature rise or
Decline, by adjusting electromagnetic oven power so that the stabilization of stainless steel or stainless steel interlayer electromagnetism pot temperature.
The present embodiment is further illustrated by herein below：
For common stainless steel or stainless steel interlayer pot body, boiling point detection and heat insulation function are realized using harmonic period.
For common stainless steel or stainless steel jacketed pan, absolute temperature of boiler cannot be obtained using harmonic period, but
It may determine that the opposite change of temperature of boiler.Utilize this point, it is possible to achieve boiling point detects and heat insulation function.
The present invention is as follows by following principle：
The coil of the electromagnetic stove and the resonant frequency of pot bodyThe i.e. described free harmonic vibration cycleL wherein in formula is the resonant inductance in schematic diagram；C is the resonant capacitance in schematic diagram, can by formula
Know, when capacitor's capacity changes, resonant frequency is affected；The capacitance of resonant capacitance influenced be subject to capacitance temperature it is very small,
And, can be by measuring the temperature t_c of capacitance, to compensate with capacitance change and the temperature of capacitance with uniformity.
When inductance L changes, resonant frequency is affected.
Following the factor for influencing inductance L is：
(1) coil
(2) material of electromagnetic cooker, and its position with coil
(3) temperature of bowl
Wherein for electromagnetic stove and matched electromagnetic cooker, factor (1), (2) can neglect, it can thus be appreciated that main shadow
The factor for ringing inductance L is the temperature of electromagnetic cooker.
By resonant frequency equation it is recognised that harmonic period is mainly influenced be subject to the temperature of electromagnetic cooker.For specific
Electromagnetic cooker for, if measuring harmonic period T, it is possible to substantially judge the temperature of bowl.
By experiment, for electromagnetic cooker of the most stainless steel or stainless steel interlayer as the bottom of a pan, when it
When being heated on electromagnetic stove, there are similar linear relation between the harmonic period and cooking bottom temperature in circuit.
The method that the present invention detects resonant frequency by following three kinds when electromagnetic stove works normally
As shown in Figure 1：By voltage stabilizing excitation power supply, voltage of voltage regulation excitation is carried out to coil.Measure resonant frequency when
Wait, by selecting switch, the power supply stable to inductance input is encouraged, observes the free period T of inductive drop U inductance.
In VAC zero crossings, by selecting switch, input power is switched to voltage stabilizing excitation power supply U2 by U1, voltage stabilizing swashs
It is △ T to encourage power supply U2 power-on times, and the conducting pulsewidth T2 conducting IGBT of fixation are set in △ T, to resonance circuit into row energization,
And measure the free period T of measurement inductive drop U3.After △ T by switching switch by power supply as depicted by voltage stabilizing
Excitation power supply U2 is switched to input voltage U1.
If Fig. 2 is excitation power supply switching instant diagram, if Fig. 3 is inductive drop U3 free oscillation waveform diagrams.Wherein
T1 to t2 is IGBT ON times, and by voltage of voltage regulation U2 to resonance circuit into row energization, since the t2 moment, IGBT is disconnected,
The free oscillation centered on U2 magnitudes of voltage of UL voltages, wherein t3 to t4 are a cycle of oscillation.If Fig. 4 is direct measurement inductance electricity
The harmonic period of pressure, when IGBT simply sends out a pulsed width actuation, it is known that inductive drop fluctuates up and down around Ud, gradually decay,
Final inductive drop is Ud.T1 shown in upper figure is the half in free harmonic vibration cycle.So the IGBT in normal work, inductive drop
Time higher than Ud is 1/2 (half in free harmonic vibration cycle)
Inductive drop UL and Ud is subjected to voltage comparison as shown in figure 5, having compared by voltage, exports square-wave signal, is led to
The free harmonic vibration cycle can be measured by crossing single chip computer measurement square wave pulse width signal.As shown in fig. 6, inductive current, inductive drop with
And the square-wave signal of voltage comparator output.It should be noted that square wave output is the waveform exported using positive comparator, such as
Fruit uses reverse comparator, and the waveform logic of output is opposite.Harmonic period is measured into row energization to resonance circuit with Ud power supplys.
As shown in fig. 7, at alternating voltage zero-crossing point, IGBT is turned off in stopping, because without power consumption, filter capacitor
C1 is electrically charged, and voltage Ud is slowly raised, finally to SQRT (2) * Uac after T/2 (T is the cycle of power frequency supply Uac).
As shown in fig. 7, after Ud voltage stabilizations, IGBT is turned on certain pulsewidth, to resonance circuit into row energization, Ran Houguan
Fall IGBT so that inductive drop UL free oscillations, measure the free period of UL.After the execution cycle measures, will be into
Enter at next alternating voltage zero-crossing point, IGBT is turned on certain repetition pulse so that UL is filtered at next zero crossing
The electricity of capacitance is let go, and restarting normal work for startup electromagnetic stove is ready.
In addition, the temperature boiling point for estimating specific stainless steel or stainless steel interlayer pot body using electromagnetic stove harmonic period is examined
Survey, water at room temperature be heated to the canonical process of boiling in electromagnetic stove as shown in Figure 10, by time t_a to t_b, the time compared with
Short, usually at more than ten seconds, mainly pot body heating, temperature rises soon, and harmonic period changes greatly；, will between t_b to t_c
Water temperature in pot gradually heats up, and tends to be identical with temperature of boiler, and during which harmonic period change is smaller；Between t_c to t_d, pot
Temperature gradually rises up to boiling point with water temperature；Harmonic period fluctuation is very small after to boiling point.
According to the above process, judge that flow is as follows：
(1) the change rate K of resonant frequency is just calculated every △ t,
K=(harmonic period at harmonic period-(t) moment at (t+ △ t) moment)/△ t
(2) from beginning to warm up, when K for the first time from large to small, and when K values drop to minimum, judge at this time as the t_b moment.
(3) continue to heat, when K for the second time from large to small, and during close to zero, it is believed that be at this time t_d, if again persistently plus
Hot a period of time △ t2, then judge that water has reached boiling point really, stop heating.
Heat insulation function detection uses following methods
By observing harmonic period, it can be determined that go out the temperature change of pot body.Temperature of boiler can be kept the temperature accordingly
Processing, that is, maintain the harmonic period value of system in a stable desired value.
Harmonic period desired value T_target is set, will generally start the harmonic period value at heat insulation function moment as target
Value.
Current harmonic period T_current is measured,
By desired value T_target compared with current harmonic period T_current, its difference is △ T.
△ T are subjected to PI processing, to control output power, are repeated the above steps.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (9)
- A kind of 1. method for measuring assessment vessel for electromagnetic cooker temperature, it is characterised in that：Comprise the following steps：Step 1: if electromagnetic stove is using specific stainless steel or stainless steel interlayer electromagnetic cooker, then the harmonic period in circuit There is similar linear relationship between value and temperature of boiler；Step 2: in normal work, profit obtains harmonic period T with the aforedescribed process, and T is searched in thermograph form and is most connect The nearly cycle corresponding temperature t, it is believed that temperature t is the temperature of pot body；Step 3: assess relative temperature using cyclic curve, setting is to boil water to be automatically stopped or preservation and controlling.
- A kind of 2. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 1, it is characterised in that：The step In one, by experiment, electromagnetic cooker is heated with electromagnetic stove, the cooking bottom temperature of electromagnetic cooker is heated to t_d by t_a, records temperature Degree, and the harmonic period under different temperatures is recorded, form thermograph form.
- A kind of 3. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 1, it is characterised in that：It is described to boil water It is as follows to be automatically stopped temperature detection step：Step 1: the harmonic period T that detection is current；Step 2: being searched in thermograph form, current immediate temperature t is obtained；Step 3: whether immediate temperature t arrives boiling temperature；Step 4: immediate temperature t reaches boiling temperature, stop heating or maintain small function heated condition.
- A kind of 4. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 1, it is characterised in that：The step In three, immediate temperature t detects to be less than boiling temperature, returns in step 1, detects current harmonic period again T。
- A kind of 5. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 1, it is characterised in that：The insulation Control temperature detection step as follows：Step 1: the harmonic period T that detection is current；Step 2: being searched in thermograph form, current immediate temperature t is obtained；Step 3: calculate the difference △ t between Current Temperatures t and target temperature t_target；Step 3: adjusting output function according to △ t carries out heat insulation function heating；Step 4: whether heat insulation function heating terminates.
- A kind of 6. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 5, it is characterised in that：The step Heat insulation function heating does not terminate also in four, returns in step 1, detects current harmonic period T again.
- A kind of 7. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 4, it is characterised in that：It is humorous measuring When vibration frequency：By selecting switch, the power supply excitation stable to inductance input, measurement inductive drop U inductance freely shakes Swing harmonic period T.
- A kind of 8. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 4, it is characterised in that：In measurement certainly By the cycle of resonance：Compared by voltage and inductive drop UL and Ud is subjected to voltage comparison, exported square-wave signal, pass through monolithic Machine measurement square wave pulse width signal can measure the free harmonic vibration cycle.
- A kind of 9. method for measuring assessment vessel for electromagnetic cooker temperature according to claim 1, it is characterised in that：Pass through measurement Harmonic period T, judges that the temperature of stainless steel or stainless steel interlayer electromagnetic cooker rises or falls, by adjusting electromagnetic oven power so that The stabilization of stainless steel or stainless steel interlayer electromagnetism pot temperature.
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| CN201711276328.6A CN107990995A (en) | 2017-12-06 | 2017-12-06 | A kind of method for measuring assessment vessel for electromagnetic cooker temperature |
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| CN201711276328.6A CN107990995A (en) | 2017-12-06 | 2017-12-06 | A kind of method for measuring assessment vessel for electromagnetic cooker temperature |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111380086A (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 | Electromagnetic heating appliance, temperature control method and detection device thereof |
| CN111380627A (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 | Electromagnetic heating appliance and temperature detection method and device thereof |
| CN111928969A (en) * | 2019-05-13 | 2020-11-13 | 惠州拓邦电气技术有限公司 | Pot temperature detection device, electromagnetic heating device and pot temperature detection method |
| CN112714515A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance, control method and device thereof, and storage medium |
| CN112710412A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment and cooker calibration method and device thereof |
| CN113741227A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, cooking equipment and storage medium |
| CN113741228A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking appliance, cooking appliance and computer readable storage medium |
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| CN111380086A (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 | Electromagnetic heating appliance, temperature control method and detection device thereof |
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| CN113741227A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, cooking equipment and storage medium |
| CN113741228A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking appliance, cooking appliance and computer readable storage medium |
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