CN106979541A - The control method of electromagnetic heater and anti-dry - Google Patents
The control method of electromagnetic heater and anti-dry Download PDFInfo
- Publication number
- CN106979541A CN106979541A CN201710336127.4A CN201710336127A CN106979541A CN 106979541 A CN106979541 A CN 106979541A CN 201710336127 A CN201710336127 A CN 201710336127A CN 106979541 A CN106979541 A CN 106979541A
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- frequency
- detection cycle
- resonance circuits
- current
- dry
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Classifications
-
- 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
- F24C7/081—Arrangement or mounting of control or safety devices on stoves
-
- 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
- F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
The present invention discloses the control method of a kind of electromagnetic heater and anti-dry.The method comprising the steps of：Start electromagnetic heater, detect the resonant frequency and power output of LC resonance circuits；If the resonant frequency f in current detection cycle0' a relatively upper detection cycle resonant frequency f0Become big △ f and the power output of the relatively upper detection cycle of the power output in current detection cycle becomes hour, make the driving signal frequency f that inverter circuit is supplied under the current detection cycle1' a relatively upper detection cycle driving signal frequency f1Become big △ f；As driving signal frequency f1' be more than predeterminated frequency threshold value when, judge occur dry combustion method, close input power electromagnetic heater is stopped；Wherein, predeterminated frequency threshold value is the resonant frequency of electromagnetic heater LC resonance circuits in the unloaded state.Present invention can assure that exporting stable power during user throws pot, the accuracy and promptness of dry combustion method protection can also be effectively improved.
Description
Technical field
The present invention relates to household appliance technical field, more particularly, to the control method of a kind of electromagnetic heater and anti-dry.
Background technology
At present, Electromagnetic Heating there are energy-conserving and environment-protective relative to traditional resistance heating, it is safe and reliable, by extensively should
Fried for electromagnetic oven, electromagnetism in the household electrical appliance such as stove, electromagnetic sauce pot.However, in the household electric using Electromagnetic Heating such as electromagnetic oven
During the use of device, often occurs dry combustion method phenomenon.There are two kinds of settling modes for dry combustion method at this stage：First, when detection
When being more than a certain particular value to temperature, electromagnetic oven is turned off；Second, it is too fast to detect that electromagnetic oven heats up in a certain temperature range
When, turn off electromagnetic oven.However, due to the limitation of this body structure of product, temperature acquisition apparatus (such as thermistor) tend not to
Pan is directly contacted, and causes dry combustion method protection serious delayed, considerably increases the probability that pan and electrical equipment dry combustion method are damaged, it is impossible to real
Play the protection purpose of anti-dry.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art or correlation technique.
Therefore, it is an object of the present invention to propose a kind of control method of anti-dry.
It is another object of the present invention to the electromagnetism Electromagnetic Heating dress for proposing a kind of control method for having used anti-dry
Put.
To realize at least one above-mentioned purpose, embodiment according to an aspect of the present invention, it is proposed that a kind of anti-dry
The control method of burning, it includes step：Start electromagnetic heater, detect the resonant frequency and power output of LC resonance circuits；
If the resonant frequency f in current detection cycle0' a relatively upper detection cycle resonant frequency f0Become big △ f and current detection cycle
The relatively upper detection cycle of power output power output become hour, make to be supplied to inverter circuit under the current detection cycle
Driving signal frequency f1' a relatively upper detection cycle driving signal frequency f1Become big △ f；As driving signal frequency f1' be more than
During predeterminated frequency threshold value, judge occur dry combustion method, closing input power makes electromagnetic heater be stopped；Wherein, predeterminated frequency
Threshold value is the resonant frequency of electromagnetic heater LC resonance circuits in the unloaded state.By making driving signal frequency follow resonance
Frequency changes, it is ensured that stable power output, and by determining whether driving signal frequency more than predeterminated frequency threshold value
When just think occur dry combustion method, frequency detecting is accurate and quick, can effectively prevent dry combustion method and damage product.
According to one embodiment of present invention, in the above-mentioned technical solutions, it is preferable that persistently occur in preset time period
Driving signal frequency f1' be more than predeterminated frequency threshold value when, just judge generation dry combustion method.Such as, preset time period is -25 seconds 10 seconds.
Erroneous judgement is prevented by preset time period, the accuracy of detection is improved.
According to one embodiment of present invention, in the above-mentioned technical solutions, it is preferable that the resonance frequency of detection LC resonance circuits
The step of rate, includes：The high-frequency ac current that sampling LC resonance circuits flow through, will be changed into for the high-frequency ac current of sine wave
After square-wave signal, a detection port of microcontroller is sent to；Microcontroller determines the frequency of square-wave signal by sampling, should
Frequency is exactly the load resonant frequency of LC resonance circuits.
According to one embodiment of present invention, in the above-mentioned technical solutions, it is preferable that the step of detecting power output is wrapped
Include：Respectively sample input power input current amplitude and input voltage amplitude；Input current is multiplied by using input voltage to obtain
The power output of electromagnetic heater.
A kind of electromagnetic heater, including be linked in sequence successively EMC modules, rectification circuit, filter circuit, inverter circuit
And LC resonance circuits, the input current sample circuit and input voltage sample circuit of input power are connected, is connected with LC resonance circuits
The output current sample circuit connect, and input current sample circuit, input voltage sample circuit and output current sample circuit are equal
Microcontroller is connected, and a control port of microcontroller connects the control end of inverter circuit by drive circuit；And the electricity
Magnetic heater has used the control method of described anti-dry.
Compared with prior art, the present invention has the advantages that：
Electromagnetic heater proposed by the present invention, is considering pan and is using actual conditions, not only may insure using
Person exports stable power during throwing pot, can also effectively improve the accuracy and promptness of dry combustion method protection, reduces electromagnetism
The probability that dry combustion method is damaged occurs for heater, so as to extend electromagnetic heater service life, while improving electromagnetic heater
Reliability and safety in utilization, lifted Consumer's Experience.
Brief description of the drawings
Fig. 1 is the operation principle block diagram of electromagnetic stove；
Fig. 2 is the equivalent circuit diagram of LC resonance circuits；
Fig. 3 is the schematic diagram that changes with load current frequency of equiva lent impedance of LC resonance circuits；
Fig. 4 is the schematic flow sheet of the control method of anti-dry.
Embodiment
Electromagnetic heater by taking electromagnetic stove as an example, its operation principle block diagram is as shown in figure 1, it includes：Sequentially connect successively
EMC modules, rectification circuit, filter circuit, inverter circuit and the LC resonance circuits connect, the input connection three-phase of the EMC modules
AC power, output end connect input current sample circuit and input voltage sample circuit respectively, are connected with LC resonance circuits
Output current sample circuit, and input current sample circuit, input voltage sample circuit and output current sample circuit be all connected with
Microcontroller (being usually to be realized by single-chip microcomputer or dsp chip), and a control port of microcontroller is connected by drive circuit
Connect the control end of inverter circuit.
Realize that the electromagnetic interference between three-phase alternating-current supply and electromagnetic stove is isolated by EMC modules.Such as, EMC modules include
An inductance and protective tube in A phases, B phases and C phases are serially connected in respectively, and in the inductance in A phases, B phases and C phases and insurance
A filter capacitor is connected respectively between the common port and zero line N of pipe.And filter circuit includes being serially connected in rectification circuit respectively
The inductance L2 and inductance L3 of two output ends, and the filter capacitor C3 being connected between inductance L2 and inductance L3.Inverter circuit
The half-bridge IGBT module constituted including 2 high-power switch tubes IGBT1 and IGBT2.LC resonance circuits include resonant capacitance C1, humorous
Shake electric capacity C2 and electromagnetic coil disk L1, and is arranged on the pan above electromagnetic coil disk L1.
Equivalent inductance L0 in LC resonance circuits is made up of electromagnetic coil disk L1 and pan, and pan is with respect to electromagnetic coil disk
L1 distance change and pan because temperature change all can caused by equivalent inductance L0 change, so as to influence the humorous of LC resonance circuits
Vibration frequencyWherein, the equivalent circuit of LC resonance circuits is as shown in Fig. 2 harmonious by resonant capacitance C1
Shake electric capacity C2 equivalent capacity C0, electromagnetic coil disk L1 and the series resonant circuit of the equivalent inductance L0 compositions of pan composition, LC
The equiva lent impedance of resonance circuit | Z | it is with the power frequency f changes flowed through in LC resonance circuits, its change curve such as Fig. 3 institutes
Show.As can be seen from Figure 3：When the timings of load input voltage AC mono-, power frequency f more deviates load resonant frequency f0, equivalent resistance
It is anti-| Z | bigger, the power of output is smaller；Work as f=f0When, equiva lent impedance | Z | minimum, the power now loaded is maximum；Work as f>f0
When, equiva lent impedance | Z | in perception and the bigger induction reactance of frequency is bigger, power output is smaller；As f ＜ f0When, equiva lent impedance | Z | in appearance
Property, and the smaller capacitive reactance of frequency is bigger, power output is smaller.Therefore, the resonant frequency of LC resonance circuits is slightly below 2 in inverter circuit
Individual high-power switch tube IGBT1 and IGBT2 lowest operating frequency, making load, (no matter pan is apart from electromagnetism under any circumstance
Situations such as coil panel L1 distance) in perception.
Three-phase alternating-current supply is rectified into DC voltage by rectification circuit, and circuit filtering is processed into stable flat after filtering
Sliding DC voltage, is converted into electromagnetic coil disk L1 upstream in high-frequency ac electric signal, LC resonance circuits too high by inverter circuit
Frequency alternating current, the alternating current of high frequency produces the electromagnetic field of alternation, according to electromagnetic inductive heating principle, in electromagnetic coil disk L1
After the placing cooker of top, the bottom of a pan of electromagnetic energy to pan, the bottom of a pan of pan produces vortex, because the fuel factor of vortex is heated
Pan, so as to realize that electric energy is converted into energy heats pan.
When cook uses electromagnetic stove cooking, in order to which the food in pan is quick, uniform heating is to ensure food mouthfeel
Essential condition, is that this cook can have the custom for throwing pot up and down often.However, during pot is thrown up and down, being used as the pan of load
When leaving electromagnetic coil disk L1, equivalent inductance L0 inductance value reduces in LC resonance circuits, the resonant frequency f of LC resonance circuits0
It can become big, cause resonant frequency f0More than resonant frequency f0And capacitive resonant condition is slipped into from inductive resonance state, make electromagnetic stove
Power output, which can be reduced, causes pan heating drastically to reduce, and is unfavorable for food and quickly, uniformly heats！Therefore, electromagnetism of the present invention adds
Thermal needs effective anti-dry on the premise of heating power is ensured.With reference to shown in Fig. 4, the embodiment includes step is implemented as described below
Suddenly：
Step S1. starts electromagnetic stove, detects the resonant frequency f of LC resonance circuits0And the power output of electromagnetic stove.
The high-frequency ac current flowed through on electromagnetic coil disk L1 is detected by output current sample circuit, by for sine wave
High-frequency ac current is changed into after square-wave signal, is sent to a detection port of microcontroller.Microcontroller is true by sampling
Determine the frequency of square-wave signal, the frequency is exactly the power frequency on electromagnetic coil disk L1, that is, the load of LC resonance circuits is humorous
Vibration frequency f0.Meanwhile, sampled respectively input current amplitude and input by input current sample circuit, input voltage sample circuit
Voltage magnitude is simultaneously sent to microcontroller, and the power (power=input voltage * input electricity of electromagnetic stove is calculated by microcontroller
Stream).
If the resonant frequency f in step S2. current detection cycles0' a relatively upper detection cycle resonant frequency f0Become big △
F (i.e. f0'=f0+ △ f) and the relatively upper detection cycle of power output in current detection cycle power output become hour, it is micro-
Controller adjusts drive circuit by changing the pulsewidth of control port output pwm signal and exported to the drive signal of inverter circuit
Frequency, make the driving signal frequency f in current detection cycle1' a relatively upper detection cycle driving signal frequency f1Become big △
F, i.e. f1'=f1+△f。
When microcontroller by output current sample circuit detects load current frequency f relative load resonant frequencies f0's
When becoming big △ f, because when pan leaves electromagnetic coil disk L1 when throwing pot up and down, the power of electromagnetic stove can be reduced, therefore microcontroller
Sampled after input current and input voltage, calculated respectively by input current sample circuit, input voltage sample circuit in real time
The power output of electromagnetic stove reduces, therefore when the power output of electromagnetic stove reduces and detects the resonant frequency big △ f of change, microcontroller
Device adjusts drive circuit by changing the pulsewidth of control port output pwm signal and exported to the frequency of the drive signal of inverter circuit
Rate f1, make driving signal frequency f1Also △ f are changed in the same direction, so that driving signal frequency f1Slightly above resonant frequency f0, make LC humorous
Circuit shake close to resonant condition, in LC resonance circuits electromagnetic coil disk L1 electric current uprush and make electromagnetic stove keep it is higher and compared with
For stable power output.
Certainly, when returning to as the pan of load above electromagnetic coil disk L1, now microcontroller will detect resonance frequency
Rate f0The △ f that diminish, while also will detect electromagnetic stove power output change, by microcontroller by changing pwm signal
Pulsewidth makes the driving signal frequency follow resonant frequency also to diminish △ f.
Step S3. determines whether the driving signal frequency f in current detection cycle1' whether it is more than predeterminated frequency threshold value, if
No expression works on without occurring dry combustion method, if so, being transferred to step S4.
Wherein, predeterminated frequency threshold value be electromagnetic stove in the unloaded state (when i.e. without pan) LC resonance circuits resonance frequently
Rate.This predeterminated frequency threshold value is due to unrelated with pan, therefore manufacturing producer in electromagnetic stove can predefine before dispatching from the factory.
Step S4. works as driving signal frequency f1' when being more than predeterminated frequency threshold value, judge occur dry combustion method, now microcontroller
Control thumper, which is sent, alarms and closes input power, is stopped.
Certainly, in order to prevent erroneous judgement, a time restriction can be increased, such as in preset time period (such as 10 seconds -25
Second) in persistently there is driving signal frequency f1' be more than predeterminated frequency threshold value when be just considered occur dry combustion method, now just close input
Power supply makes electromagnetic stove be stopped.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (6)
1. a kind of control method of anti-dry, it is characterised in that including step：
Start electromagnetic heater, detect the resonant frequency and power output of LC resonance circuits；
If the resonant frequency f in current detection cycle0' a relatively upper detection cycle resonant frequency f0Become big △ f and current detection
The power output of the relatively upper detection cycle of the power output in cycle becomes hour, makes to be supplied to inversion electricity under the current detection cycle
The driving signal frequency f on road1' a relatively upper detection cycle driving signal frequency f1Become big △ f；
As driving signal frequency f1' be more than predeterminated frequency threshold value when, judge occur dry combustion method, close input power fill Electromagnetic Heating
Put and be stopped；
Wherein, predeterminated frequency threshold value is the resonant frequency of electromagnetic heater LC resonance circuits in the unloaded state.
2. the control method of anti-dry according to claim 1, it is characterised in that persistently driven in preset time period
Signal frequency f1' be more than predeterminated frequency threshold value when, just judge generation dry combustion method.
3. the control method of anti-dry according to claim 2, it is characterised in that preset time period is -25 seconds 10 seconds.
4. the control method of anti-dry according to claim 1, it is characterised in that the resonant frequency of detection LC resonance circuits
Step includes：
The high-frequency ac current that sampling LC resonance circuits flow through, will change into square-wave signal for the high-frequency ac current of sine wave
Afterwards, it is sent to a detection port of microcontroller；
Microcontroller determines the frequency of square-wave signal by sampling, and the frequency is exactly the load resonant frequency of LC resonance circuits.
5. the control method of anti-dry according to claim 1, it is characterised in that include the step of detection power output：
Respectively sample input power input current amplitude and input voltage amplitude；
The power output that input current obtains electromagnetic heater is multiplied by using input voltage.
6. a kind of electromagnetic heater, including be linked in sequence successively EMC modules, rectification circuit, filter circuit, inverter circuit and
LC resonance circuits, it is characterised in that also include：Connect the input current sample circuit and input voltage sampling electricity of input power
Road, the output current sample circuit being connected with LC resonance circuits, and input current sample circuit, input voltage sample circuit and defeated
Go out current sampling circuit and be all connected with microcontroller, and a control port of microcontroller connects inverter circuit by drive circuit
Control end；And the electromagnetic heater has used the control method of the anti-dry as described in claim 1-5 any one.
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| CN201710336127.4A CN106979541A (en) | 2017-05-12 | 2017-05-12 | The control method of electromagnetic heater and anti-dry |
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| CN201710336127.4A CN106979541A (en) | 2017-05-12 | 2017-05-12 | The control method of electromagnetic heater and anti-dry |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109429399A (en) * | 2017-09-05 | 2019-03-05 | 佛山市顺德区美的电热电器制造有限公司 | The control method and device of cookware anti-dry, electromagnetic oven |
| CN109730521A (en) * | 2019-01-28 | 2019-05-10 | 广东美集世智能科技有限公司 | A kind of cooking stove device for electrical equipment for use in kitchen wireless power |
| CN110071621A (en) * | 2018-01-24 | 2019-07-30 | 株式会社村田制作所 | Converter |
| CN110319464A (en) * | 2018-03-28 | 2019-10-11 | 佛山市顺德区美的电热电器制造有限公司 | A kind of cookware temperature overheating prevention system, method and device |
| CN111385922A (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 |
| CN112714518A (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, control method and device thereof and storage medium |
| CN112839398A (en) * | 2019-11-25 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and dry burning detection method thereof |
| CN113124427A (en) * | 2019-12-30 | 2021-07-16 | 浙江绍兴苏泊尔生活电器有限公司 | Cookware dry burning detection method and device and electromagnetic appliance |
| CN113465179A (en) * | 2021-07-12 | 2021-10-01 | 江西摩力斯科技股份有限公司 | Electromagnetic heating device and dry-burning prevention control method |
| CN113747619A (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 appliance, cooking appliance and storage medium |
| CN113729506A (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 appliance, cooking appliance and storage medium |
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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 |
| CN113747618A (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 apparatus, and computer-readable 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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| CN113741227B (en) * | 2020-05-29 | 2023-08-29 | 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 |
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| CN113747619A (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 appliance, cooking appliance and storage medium |
| CN113747619B (en) * | 2020-05-29 | 2024-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device for cooking appliance, cooking appliance and storage medium |
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Application publication date: 20170725 |