CN106813269A - A kind of electromagnetic heating apparatus - Google Patents
A kind of electromagnetic heating apparatus Download PDFInfo
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- CN106813269A CN106813269A CN201510893598.6A CN201510893598A CN106813269A CN 106813269 A CN106813269 A CN 106813269A CN 201510893598 A CN201510893598 A CN 201510893598A CN 106813269 A CN106813269 A CN 106813269A
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- infrared
- heating unit
- circuit
- electromagnetic
- mcu
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Classifications
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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
-
- 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
-
- 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
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/129—Cooking devices induction ovens
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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)
- Induction Heating Cooking Devices (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention relates to electromagnetic oven heating technical field, there is provided a kind of electromagnetic heating apparatus, including：Electromagnetic Heating unit, infrared heating unit and MCU.The MCU is connected with the Electromagnetic Heating unit and infrared heating unit, and for controlling the Electromagnetic Heating unit and infrared heating unit individually or while heating.Electromagnetic heating apparatus of the invention, due to including Electromagnetic Heating unit and infrared heating unit, therefore can realize that unlike material heats the heating of utensil, and it is widely used unrestricted.Additionally due to including infrared heating unit, therefore its maximum heating power is not limited by coil panel maximum heating power.
Description
Technical field
The present invention relates to electromagnetic oven heating technical field, more particularly to a kind of electromagnetic heating apparatus.
Background technology
Current electromagnetic oven, normally only with coil panel, therefore can only heat, it is impossible to right to ferromagnetism cooking apparatus
Non iron magnetic cooking apparatus is heated, and it is restricted using the species of cooking apparatus.Additionally, for ferromagnetism cooking pot
For tool, its maximum heating power is also limited by coil panel maximum heating power.
The content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is just to provide a kind of electromagnetic heating apparatus, and it not only includes Electromagnetic Heating unit
Also include infrared heating unit, such that it is able to avoid limitation of the single electromagnetic heating method to electromagnetic oven application.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides a kind of electromagnetic heating apparatus, including：
Electromagnetic Heating unit, infrared heating unit and MCU,
The MCU is connected with the Electromagnetic Heating unit and infrared heating unit, with control the Electromagnetic Heating unit and
The infrared heating unit is individually heated or heated simultaneously.
Preferably, the MCU includes inspection pot module and power distribution module；
In the presence of the inspection pot module does not detect cooking apparatus, the power distribution module stops to described infrared
Heating unit and the heating power of Electromagnetic Heating unit distribution are zero；Deposited when the inspection pot module detects cooking apparatus
When, the power distribution module at least one of the infrared heating unit and the Electromagnetic Heating unit distribute heat
Power.
Preferably, the Electromagnetic Heating unit includes：
Resonance circuit, the resonance circuit includes switch element, resonant capacitance and resonant inductance, and the resonant capacitance is harmonious
Shaken inductance in parallel, and one of public connecting end of the resonant capacitance and resonant inductance is electrically connected with the city after rectification, another
Individual public connecting end is connected with the colelctor electrode of the switch element；
Circuit driven by electromagnetic means, one end of the drive circuit is connected with the electromagnetic power adjustment module in the MCU, another
End is connected with the base stage of the switch element；
Resonance sync detection circuit, one end is connected with the colelctor electrode of the switch element, to detect the switch element collection
The voltage of electrode, the connection of the other end and the MCU；
After the MCU sends inspection pot pulse to the circuit driven by electromagnetic means, the inspection pot module is same according to the resonance
Whether the voltage upset number of times that step detection circuit is exported whether there is judging the cooking apparatus less than predetermined number of times.
Preferably, the MCU includes wood properly test module and power distribution module, when the wood properly test module is detected
During the cooking apparatus of irony magnetic, the power distribution module switches to the startup Electromagnetic Heating unit and/or described infrared
Cooking apparatus described in heating unit heats；It is described when the wood properly test module detects the cooking apparatus of non iron magnetic
Power distribution module switches to the startup infrared heating unit and heats the cooking apparatus.
Preferably, the MCU includes heating switching prompting module, and the heating switches prompting module according to wood properly test mould
Cooking apparatus material detected by block, reminds user to select corresponding heating unit heats.
Preferably, the Electromagnetic Heating unit includes：
Resonance circuit, the resonance circuit includes switch element, resonant capacitance and resonant inductance, and the resonant capacitance is harmonious
Shaken inductance in parallel, and one of public connecting end of the resonant capacitance and resonant inductance is electrically connected with the city after rectification, another
Individual public connecting end is connected with the colelctor electrode of the switch element；
Circuit driven by electromagnetic means, one end of the drive circuit is connected with the MCU, the base of the other end and the switch element
Pole connects；
Resonance sync detection circuit, one end is connected with the colelctor electrode of the switch element, to detect the switch element collection
The voltage of electrode, the other end is connected with the MCU；
After the MCU sends inspection pot pulse to the circuit driven by electromagnetic means, the wood properly test module is by detecting
The interval time of the adjacent turnover voltage that resonance sync detection circuit is exported is stated to judge the material of the cooking apparatus.
Preferably, the infrared heating unit includes infrared heating circuit and infrared driver circuit；The infrared heating electricity
Road has and is connected to infrared heating film between civil power zero line and live wire, and one end of the infrared driver circuit is connected to described red
Between additional hotting mask and civil power, the other end of the infrared driver circuit is connected with the infrared power adjustment module in the MCU,
The infrared power adjustment module is input into the second predetermined duty according to the heating power value distributed to the infrared driver circuit
The pwm signal of ratio.Preferably, the Electromagnetic Heating unit also include zero cross detection circuit, described zero cross detection circuit one end with
City's electrical connection after rectification, to detect the zero cross signal of civil power, the other end is connected with the MCU；
The zero cross signal that the MCU is detected according to the zero cross detection circuit is in the predetermined time to the infrared driving
Circuit is input into the pwm signal of the predetermined duty cycle.
Preferably, the infrared driver circuit includes storage capacitor, first switch, inductance and the first diode, the storage
Between the infrared heating film and civil power, one end that the storage capacitor is connected with infrared heating film passes through institute to energy capacitances in series
State inductance to be connected with the source electrode of the first switch, one end that the storage capacitor is electrically connected with the city passes through the first diode
Source electrode with the first switch is connected, and the drain electrode of the first switch is electrically connected with the city, the grid of the first switch
It is connected with the infrared power adjustment module of the MCU.
Preferably, the infrared driver circuit also includes second switch and the second diode, the inductance and the energy storage
The public connecting end of electric capacity is connected with the drain electrode of the second switch, and civil power is connected with the source electrode of the second switch, and described
Two diodes are connected between the drain electrode of the second switch and the storage capacitor.
Preferably, the infrared driver circuit includes the bidirectional triode thyristor being connected between infrared heating film and civil power, with
And it is connected to the isolation optocoupler between the bidirectional triode thyristor and the regulation of MCU infrared powers.
(3) beneficial effect
Electromagnetic heating apparatus of the invention, due to including Electromagnetic Heating unit and infrared heating unit, therefore can realize
Unlike material heats the heating of utensil, and it is widely used unrestricted；Additionally due to including infrared heating unit, therefore it is maximum
Heating power is not limited by coil panel maximum heating power.
In preferred scheme of the invention, the MCU of electromagnetic heating apparatus also includes cooking apparatus wood properly test module, for examining
Survey is placed on the material of the cooking apparatus heated on electromagnetic oven, so as to select different according to the material of different cooking apparatus
Heating unit heated.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit module schematic diagram of electromagnetic heating apparatus of the invention；
Fig. 2 is the structural representation of EMC circuits 10 and infrared heating unit 11 in Fig. 1；
Fig. 3 is the structural representation of EMC circuits 10 and infrared heating unit 11 in Fig. 1；
Fig. 4 is resonance circuit in Electromagnetic Heating unit, between resonance sync detection circuit and IGBT drive circuit and MCU
Annexation schematic diagram；
Fig. 5 is the close-up schematic view at II in Fig. 4.
Specific embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following examples are used for
The present invention is illustrated, but can not be used for limiting the scope of the present invention.
In the description of the invention, it is necessary to the orientation or position relationship of the instruction such as explanation, term "left", "right" are base
In orientation shown in the drawings or position relationship, it is for only for ease of and describes of the invention and simplify description, rather than instruction or hint
Signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
The limitation of invention.Additionally, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying
Relative importance.
The electromagnetic heating apparatus of the present embodiment, including Electromagnetic Heating unit, infrared heating unit and MCU.Wherein, MCU with
The Electromagnetic Heating unit and infrared heating unit are connected, and for controlling the Electromagnetic Heating unit and infrared heating unit list
Solely or simultaneously heat.
The electromagnetic heating apparatus that the present embodiment is provided, due to being provided with infrared heating unit, therefore can be to non iron magnetic
Cooking apparatus is heated.Additionally, infrared heating unit can also combine Electromagnetic Heating unit being carried out to ferromagnetism cooking apparatus
Heating, to improve the firing rate and highest heating power of ferromagnetism cooking apparatus.
The present embodiment set infrared heating unit method be：Infrared heating film, Huo Zhe are sprayed in the lower surface of panel
The outer surface spraying infrared heating film of cooking apparatus.
Further, the MCU of the electromagnetic heating apparatus of the present embodiment includes inspection pot module and power distribution module.Wherein,
Inspection pot module is not detected in the presence of cooking apparatus, and the power distribution module is to the infrared heating unit and the electromagnetism
The heating power of heating unit distribution is zero, so that the infrared heating unit and Electromagnetic Heating unit are not added
In the presence of the inspection pot module detects cooking apparatus, the power distribution module is to the infrared heating unit and described for heat
At least one of Electromagnetic Heating unit distributes heating power.I.e. power distribution module is only to infrared heating unit distribution heating work(
Rate, only distributes heating power to Electromagnetic Heating unit, or simultaneously to infrared heating unit and the distribution heating of Electromagnetic Heating unit
Power.
Additionally, the MCU of the electromagnetic heating apparatus of the present embodiment can also include wood properly test module and power distribution module,
When the wood properly test module detects the cooking apparatus of irony magnetic, the power distribution module switches to the startup electricity
Magnetic heating unit and/or the infrared heating unit heat the cooking apparatus；When the wood properly test module detects non-ferric
During the cooking apparatus of matter magnetic, the power distribution module switches to the startup infrared heating unit and heats the cooking pot
Tool.
Specifically, MCU also includes heating switching prompting module, and the heating switches prompting module according to wood properly test module
Detected cooking apparatus material, reminds user to select corresponding heating unit heats.
The present embodiment also provides a kind of distribution method of heating power between Electromagnetic Heating unit and infrared heating unit：One
As for, when Electromagnetic Heating unit is with the power laser heating less than a certain certain power value (being assumed to be the first predetermined power value)
When, electromagnetic oven IGBT occur than it is more serious it is hard open situation, so as to cause that the loss of IGBT is larger, temperature rise is higher, shorten
The IGBT life-spans.And the heating of infrared heating unit belongs to the heating of resistance-type, different from the mode of heating of Electromagnetic Heating unit, because
This can when less than the first predetermined power value laser heating.The first predetermined power value is the equal of Electromagnetic Heating in the present embodiment
Can unit individually realize a critical value of laser heating with the performance number of user input.First set in the present embodiment
The scope of predetermined power value is 800 watts~1100 watts, and the scope of certain first predetermined power value can also be done according to actual conditions
Corresponding adjustment.
When the performance number of user input is more than the first predetermined power value, the present embodiment adds to infrared heating unit and electromagnetism
Further optimization has been done in the switching of hot cell heating.Specifically, the present embodiment is provided with more than the first predetermined power value
Two predetermined power values, when power detection module detects the power of user input higher than the first predetermined power value and pre- less than second
When determining performance number, power distribution module is switched to and only start the Electromagnetic Heating unit heating, and accordingly MCU gives infrared heating list
The heating power of unit's distribution is zero.When the power that the power detection module detects user input is higher than the second predetermined power value
When, the power distribution module is switched to while starting the Electromagnetic Heating unit and infrared heating unit heating, correspondence
Ground MCU distributes the heating power of certain value to infrared heating unit and Electromagnetic Heating unit simultaneously.
For the situation of the power higher than the second predetermined power value of user input, the power distribution module of MCU can basis
Default algorithm distributes corresponding heating power value to Electromagnetic Heating unit and infrared heating unit.One kind that the present embodiment is provided
Preset algorithm is：Heating power value of the power of MCU with module assignment to Electromagnetic Heating unit is less than or equal to the second predetermined power
Value, the power of MCU with module assignment to infrared heating unit heating power for user input performance number with distribute to electromagnetism
The difference of heating unit performance number.The power of certain MCU can also be according to other default algorithms to infrared heating list with module
Unit and Electromagnetic Heating unit distribution power.
The heating of Electromagnetic Heating unit is that directly cooking apparatus is heated, and cooking apparatus sheet is and infrared as heater
Heating unit is to pass to cooking apparatus, i.e. infrared heating film for heater by by the heating of infrared heating film, therefore electromagnetism
The efficiency of heating surface of heating unit is higher than the efficiency of heating surface of infrared heating unit.When the power of user input is more than the first predetermined work(
It is preferential to be heated from Electromagnetic Heating unit during rate value.But when the power of user input is more than certain value, i.e., higher than second
During work(predetermined power value, if still only start Electromagnetic Heating list and heat, Electromagnetic Heating unit can not only produce compared with
Big noise, and the electronic component such as the IGBT of Electromagnetic Heating unit is also easier to be damaged.Therefore from improve the efficiency of heating surface, drop
The noise and raising electromagnetic oven electronic component longevity of low electromagnetic oven consider, predetermined higher than the second work(in the power of user input
During performance number, power distribution module is switched to and start simultaneously infrared heating unit and the heating of Electromagnetic Heating unit.Also based on above-mentioned
Angle considers that the scope of the second predetermined power value is set to 1500 watts~1700 watts by the present embodiment, certainly can also be according to tool
Body situation does corresponding adjustment again.
Following table be in the present embodiment MCU according to the heating power of user input to infrared heating unit and Electromagnetic Heating unit
Distribute the specific algorithm of heating power.In following table, the specified heating power of electromagnetic oven is 2100W, as can be seen from the table, this reality
The laser heating that the electromagnetic oven of example offer can be provided between 100W to 2100W is applied, enables to meet continuous low power Baoshang
Etc. various application scenarios,
Table 1
Additionally, considering from the maximum heating power for improving electromagnetic oven, the scope of the second predetermined power value can also be set
It is 2000 watts~2200 watts.This power bracket is roughly equivalent to the maximum rated power model that existing Household induction cooker can be provided
Enclose, when the heating power value of user input exceedes the second predetermined power value, power distribution module is switched to while starting red
Additional hot cell and Electromagnetic Heating unit are heated, if the maximum rated heating power that infrared heating unit can be provided is 1000
Watt, then can be by the maximum heating work(of electromagnetic oven by the way of this joint infrared heating unit and the heating of Electromagnetic Heating unit
Rate brings up to 3000 watts~3200 watts.
It is worth noting that：Electromagnetic Heating unit and infrared heating unit are when switching is heated, it may appear that heating is discontinuous
Problem, it is preferred that the present embodiment when there is heating switching in Electromagnetic Heating unit and infrared heating unit, in latter heated mould
When formula has begun to carry out, then previous heating mode is allowed to continue a time delay.Such as heated when by only infrared heating unit
When heating switching to only Electromagnetic Heating unit, there is (about 5 seconds) infrared heating unit of a bit of time and Electromagnetic Heating in centre
Unit is in common heated condition.
The electromagnetic heating apparatus of the present embodiment, both can simultaneously include above-mentioned inspection pot module and wood properly test module, also may be used
With one of them at least including inspection pot module or wood properly test module.The present embodiment provides a kind of single based on heating below
Unit examine the mode of pot and wood properly test.
The circuit of Electromagnetic Heating unit is introduced below in conjunction with Fig. 1, Fig. 4 and Fig. 5, Electromagnetic Heating unit typically at least includes humorous
Shake circuit and circuit driven by electromagnetic means, and one end of circuit driven by electromagnetic means is connected with resonance circuit, the electromagnetic power in the other end and MCU
Adjustment module is connected, and electromagnetic power adjustment module is accounted for according to the heating power value of distribution to circuit driven by electromagnetic means input first is predetermined
The pwm signal of empty ratio.Resonance circuit includes switch element, resonant capacitance and resonant inductance, resonant capacitance and resonance inductance in parallel,
One of public connecting end of resonant capacitance and resonant inductance is electrically connected with the city after rectification, another public connecting end with open
The colelctor electrode connection of element is closed, wherein switch element typically uses IGBT.
Electromagnetic Heating unit also includes resonance sync detection circuit, and one end of resonance sync detection circuit is electric with resonance respectively
Hold and two public connecting ends of resonant inductance are connected, i.e., end Zhong Youyige branches are connected with the colelctor electrode of IGBT, to detect
The voltage of IGBT colelctor electrodes, the other end of resonance sync detection circuit is connected with MCU, and institute is detected in resonance sync detection circuit
When the voltage for stating the colelctor electrode of IGBT pipes is minimum point voltage (generally zero), the electromagnetism rate adjustment module of MCU is to Electromagnetic Drive
The pwm signal of the predetermined duty cycle of circuit output first.
Electromagnetic Heating unit can also include zero cross detection circuit, and zero cross detection circuit one end is electrically connected with the city after rectification
Connect, to detect the zero cross signal of civil power, the other end is connected with MCU, and electromagnetic power adjustment module is after zero cross signal is received to electricity
The first predetermined duty cycle pwm signal that Magnetic driving circuit is input into after reinitializing.
Electromagnetic Heating unit can also include surge detection circuit, excess temperature detection circuit, and over-voltage detection circuit and excessively stream are examined
Slowdown monitoring circuit.Surge detects the voltage signal of electric circuit inspection civil power, when forward voltage or negative sense electricity very high occurs suddenly in civil power
During pressure, surge detects that circuit sends the signal of shut-off IGBT to MCU.Excess temperature detects circuit in the IGBT temperature as switch element
The signal of shut-off IGBT is sent when reaching certain value to MCU.Over-voltage detection circuit is using the current collection in the IGBT as switch element
The signal of shut-off IGBT is sent when pole tension reaches certain value to MCU.Over-current detection circuit is the IGBT's as switch element
The signal of shut-off IGBT is sent when collector current reaches certain value to MCU.
It will be apparent that Electromagnetic Heating unit can have other circuits, not by more than, citing circuit is limited.In addition electromagnetism adds
Hot cell can also realize Electromagnetic Heating using other circuits enumerated different from the present embodiment.
For the foregoing circuit in the Electromagnetic Heating unit enumerated in the present embodiment, the inspection pot module in MCU can be with it
In resonance circuit, circuit driven by electromagnetic means and synchronous resonant circuit be engaged completion detection cooking apparatus and whether there is.In MCU
Wood properly test module can also be engaged completion cooking pot with resonance circuit therein, circuit driven by electromagnetic means and synchronous resonant circuit
Has the detection of material.
Specifically, an inspection pot pulse is input into circuit driven by electromagnetic means by the electromagnetic power adjustment module in MCU first,
The ON time of inspection pot pulse is 6us-10us, and the interval time that the pulse of inspection pot sends is about 1S~2S.Inspection pot pulse
So that resonance circuit is turned on, if carrying cooking apparatus on electromagnetic oven, the energy ezpenditure of resonance circuit must be than very fast, resonance
The output voltage upset number of times of sync detection circuit is less.If without carrying cooking apparatus on electromagnetic oven, resonance circuit
Energy ezpenditure obtains slow, and the output voltage upset number of times of resonance sync detection circuit is more.Inspection pot module is by judging resonance
Whether the output voltage upset number of times of sync detection circuit reaches pre-determined number to judge whether cooking apparatus.Such as, in advance
Fixed number of times is 10, when the output voltage upset number of times of resonance sync detection circuit is more than or equal to 10, then judges that cooking apparatus is deposited
When the output voltage upset number of times of resonance sync detection circuit is less than 10, then judging that cooking apparatus does not exist.
Wood properly test module is sentenced by detecting the interval time of the adjacent turnover voltage of resonance sync detection circuit output
The material of disconnected cooking apparatus.Such as, the electromagnetic power adjustment module in MCU is input into an inspection pot pulse to circuit driven by electromagnetic means
Afterwards, within the predetermined time, the voltage of resonance sync detection circuit output generates 12 upsets altogether, when it overturns cycle time
In 35us or so, then judge that cooking apparatus material is 430 steel, when it overturns cycle time in 25us or so, then judge to cook
Utensil material of preparing food is 304 steel.
Fig. 4 shows the concrete composition of resonance circuit and resonance sync detection circuit, below in conjunction with Electromagnetic Heating unit
Operation principle and inspection that resonance circuit, circuit driven by electromagnetic means and resonance sync detection circuit explanation detection cooking apparatus whether there is
The operation principle of cooking apparatus material is surveyed, the direction of arrow of high order end refers to the input of the civil power after rectification in Fig. 4.
Before electromagnetic oven begins to warm up, a pulse for certain ON time is exported, in circuit driven by electromagnetic means namely Fig. 5
When IGBT drive circuit is turned on, the coil panel LH in resonance circuit is that resonant inductance has electric current to flow to the right from the left side.Resonance electricity
Resonant capacitance C5 left ends voltage in road is through the electricity after R49, R51, R52, R53, R1, R5 partial pressure in resonance sync detection circuit
The in-phase input end of the internal comparator of pressure signal Va inputs MCU, resonant capacitance C5 right-hand members voltage is through resonance sync detection circuit
In R7, R2, R6, R57 partial pressure after voltage signal Vb input MCU internal comparator inverting input.Now resonance is electric
Hold C5 left end voltages and be clamped at line voltage, resonant capacitance C5 right-hand members voltage (namely is connected to IGBT and is driven by IGBT in Fig. 4
The part of circuit left end) directly move ground level to, now Va>Vb.
When IGBT drive circuit turns off IGBT, due to inductive effect, electric current can not dash forward the coil panel LH in resonance circuit
Become, maintain from left to right to continue to flow, and charged to resonant capacitance C5, resonant capacitance C5 right-hand member voltages is constantly raised, until
The release of LH electric currents is finished.When the electric current of LH is 0, C5 right-hand member voltages reach highest, now Va<Vb.
Work as Va<During Vb, the resonant capacitance C5 switched in resonance circuit discharges to the coil panel LH in resonance circuit.Electric current from
Coil panel LH right-hand members flow to left end.Until the electric energy release of C5 is finished, now the voltage on the C5 left sides is equal to the voltage on the right.Due to
Coil panel LH also has electric current flowing from right to left, and inductive effect makes the electric current of coil panel LH continue to flow from right to left.Now
Resonant capacitance C5 left end voltages are clamped at line voltage, and C5 right-hand member voltages are constantly pulled low.Until Vb<During Va, now in MCU
Internal comparator produce the pulse output of rising edge, counter proceeds by accumulated counts, while enable timer entering
Line period timing.Inspection pot module in MCU at least includes the internal comparator and counter.Accordingly, the wood properly test in MCU
Module at least includes the internal comparator and timer.
Because the energy of resonant tank is not released also, resonant tank can also repeat said process, when occurring again
Vb<During Va, stop timer and enter line period timing, read period time value now, judge the type of cooking apparatus.When one
The fixed time (pulse of inspection pot triggers resonance circuit concussion to finish), after such as 200ms~500ms, read the value of counter.
Mode above in association with circuit driven by electromagnetic means, resonance circuit and resonance sync detection circuit is cooked to detection ferromagnetism
Utensil whether there is and the material effect of detection ferromagnetism cooking apparatus is fairly good.Certainly can also realize otherwise
Detection and the detection of cooking apparatus material that cooking apparatus whether there is.Such as, ultrasonic wave transmitting is set in Electromagnetic Heating unit
Circuit and ultrasound detection circuit, inspection pot module are sentenced by the way that whether ultrasound detection circuit can detect ultrasonic reflections signal
Disconnected cooking apparatus whether there is, wood properly test module then by the frequency and amplitude range of detected ultrasonic reflections signal come
Judge the material of cooking apparatus.
With reference to Fig. 2 and Fig. 3, infrared heating unit introduced below, infrared heating unit includes infrared heating circuit and infrared
Heat driven circuit, infrared heating circuit includes the infrared heating film being connected between civil power zero line and live wire, infrared driving electricity
The one end on road is connected between the infrared heating film and civil power that (i.e. one end of infrared driver circuit can both be connected to described red
Between additional hotting mask and civil power zero line, it is also possible to be connected between the infrared heating film and civil power live wire), infrared driver circuit
The other end be connected with the infrared power adjustment module in MCU, infrared power adjustment module is according to the heating power value distributed
The pwm signal of the second predetermined duty cycle is input into infrared driver circuit.
Further, infrared power adjustment module can also be detected according to the zero cross detection circuit in Electromagnetic Heating unit
Zero cross signal the pwm signal of second predetermined duty cycle is input into the infrared driver circuit in the predetermined time.
The infrared heating drive circuit that the present embodiment is provided has two kinds, as shown in Fig. 2 the first of the present embodiment offer is red
Outer drive circuit includes isolation subelement and switch subelement, and switch subelement is connected between infrared heating film and civil power, every
Ion unit is connected between switch subelement and infrared power adjustment module.That is, isolation subelement can receive infrared power tune
The pwm signal of the second predetermined duty cycle that section module sends, with opening for controlling switch subelement and shut-off, and then controls infrared
Whether is the conducting of heater circuit.
Specifically, isolation subelement is isolation optocoupler U10, and switch subelement is bidirectional triode thyristor TR1, isolation optocoupler
U10 includes luminescent device and light-sensitive device.The positive pole S1 connection dc sources of luminescent device (provide 5 volts or 3.5 volts of electricity
Pressure), negative pole S2 connects the infrared power adjustment module of MCU, and this connected mode light-sensitive device is sent out in infrared power adjustment module
Turned on when going out low level.Certainly, the positive pole S1 of luminescent device can also connect the infrared power adjustment module of MCU, and photophore
The negative pole S2 ground connection of part, this connected mode light-sensitive device is turned on when infrared power adjustment module sends high level.Photosensor
Part is bidirectional thyristor, and first anode S6 connects the second main electrode T2 of bidirectional triode thyristor TR1, and second plate S4 connections are two-way can
The grid of control silicon TR1.The second main electrode T2 of bidirectional triode thyristor TR1 is connected with Far-infrared Heating film, and the of bidirectional triode thyristor TR1
One main electrode T1 is electrically connected with city.
The first electricity has been sequentially connected in series between the second main electrode T2 of the first anode S6 and bidirectional triode thyristor TR1 of light-sensitive device
Resistance R81 and second resistance R82.The common port of first resistor R81 and second resistance R82 and the first main electricity of bidirectional triode thyristor TR1
Connect the first electric capacity C201 between the T1 of pole；3rd resistor R80 is connected between the positive pole S1 and dc source of luminescent device.First
Resistance R81, second resistance R82,3rd resistor R80 and the first electric capacity C201 can play two-way with suitable electric current and voltage turn-on
Controllable silicon TR1, and play a part of to filter and stabilization bidirectional triode thyristor TR1 control circuits.
This infrared driver circuit is that isolation subelement and switch subelement are also based on bidirectional triode thyristor adjusting control circuit
Corresponding component in relay can be replaced into, that is, be changed to the control circuit based on relay regulation.Certain separaant
Unit and switch subelement can also be replaced with other electron component, it is not limited to the case for this embodiment.
Corresponding to this infrared driver circuit based on bidirectional triode thyristor, it combines zero cross detection circuit and infrared power is adjusted
Two kinds of section module regulation infrared heating power.The first infrared power regulative mode is more stable, and second infrared power is adjusted
Section mode response speed is faster.
Specifically, in the mode of the first the regulation infrared heating power that the present embodiment is provided：The frequency of electric current is
50HZ, when a length of 10ms of one half-wave, by a when a length of 100ms for square-wave cycle in pwm signal, infrared heating film exists
Heated when pwm signal is high level, heating is stopped when pwm signal is low level.
First, infrared power adjustment module is calculated in a square-wave cycle of pwm signal according to the heating power for being distributed
High level time t1 and low level time t2.Allocated infrared heating power and high level time t1, low are shown in table 2
Relation between level time t2.In table 2, infrared heating film all heats the maximum heating work(that can be provided in whole square-wave cycle
Rate is 1000w.When the heating power value that infrared power adjustment module is allocated is 800w, the height of the square-wave cycle of pwm signal
Level time t1 is adjusted to 80ms by 100ms, and corresponding low level time t2 is adjusted to 20ms by 0ms.I.e. in a pwm signal
Square-wave cycle in, infrared heating circuit be in 8 civil power half wave cycles conducting.When infrared power adjustment module is allocated
Heating power value be 500w when, then high level time t1 is adjusted to 50ms by 80ms again, corresponding low level t2 is by 20ms
It is adjusted to 50ms.In general, the allocated heating power value of infrared power adjustment module is bigger, a square wave of pwm signal
High level time t1 in cycle is more long, and low level time t2 is shorter.
In the heating process of infrared heating film, if being assigned to new heating power, infrared power adjustment module meeting
Algorithm in such as table 2 recalculates the high level time and low level time of pwm signal square-wave cycle, then by zero passage
Detection electric circuit inspection zero cross signal, when zero cross signal is detected, infrared power adjustment module is obtained after will recalculating
Pwm signal be sent to infrared driver circuit.
Second mode of regulation infrared heating power that the present embodiment is provided is unlike the first：By pwm signal
In the duration of a square-wave cycle be set to and civil power half wave cycles identical 10ms.Still with infrared heating film in whole square wave week
The maximum heating power that all heating can be provided in phase is for as a example by 1000w.When the heating power that infrared power adjustment module is allocated
It is worth during for 800w, the high level time t1 of one square-wave cycle of pwm signal is changed to 8ms, corresponding low level time by 10ms
T2 is 2ms by 0ms.When the heating power value that infrared power adjustment module is allocated is 500w, then by high level time t1 again
5ms is adjusted to by 8ms, corresponding low level t2 is adjusted to 5ms by 2ms.
Likewise, in the heating process of infrared heating film, if being assigned to new heating power, infrared power regulation mould
Block can also recalculate high level time and low level time in pwm signal square-wave cycle, then by zero cross detection circuit
Detection zero cross signal, when zero cross signal is detected, the pwm signal that infrared power adjustment module is obtained after will recalculating
It is sent to infrared driver circuit.
| Setting power (W) | Controlling cycle (ms) | Open the cycle (ms) | The shut-off cycle (ms) |
| 900 | 100 | 90 | 10 |
| 800 | 100 | 80 | 20 |
| 700 | 100 | 70 | 30 |
| 600 | 100 | 60 | 40 |
| 500 | 100 | 50 | 50 |
| 400 | 100 | 40 | 60 |
| 300 | 100 | 30 | 70 |
| 200 | 100 | 20 | 80 |
| 100 | 100 | 10 | 90 |
Table 2
Simply bidirectional triode thyristor circuit combination infrared power adjustment module illustrated above and zero cross detection circuit regulation are red
The two ways of additional thermal power, wherein regulation power algorithm can also use other manner.The hardware of its regulation circuit can be with
Do not combine zero cross detection circuit.The mode of infrared power adjustment module regulation infrared heating power also not necessarily uses pwm signal
Mode.
Second infrared heating drive circuit that the present embodiment is provided is pfc circuit, refers to Fig. 3.Pfc circuit includes storage
Can electric capacity, first switch, inductance and the first diode, energy storage capacitor in series between infrared heating film and civil power, storage capacitor
The one end electrically connected with city is connected by inductance with the source electrode of first switch, and one end that storage capacitor is connected with infrared heating film leads to
Cross the first diode to be connected with the source electrode of first switch, the drain electrode of first switch is electrically connected with city, the base stage of first switch and institute
State the infrared power adjustment module connection of MCU.
Further, infrared driver circuit also includes second switch and the second diode, inductance and storage capacitor it is public
Connection end is connected with the leakage of second switch, and civil power is connected with the source electrode of second switch, and the second diode is connected to second switch
Between drain electrode and storage capacitor, the base stage of second switch is connected with the infrared power adjustment module of MCU.
Wherein, first switch and second switch distinguish the Q1 and Q2 shown in corresponding diagram 3, and they are high-power, pressure-resistant
CMOS tube high；L1 in inductance corresponding diagram 3, its inductance value is in more than 400uH；First diode and the distribution of the second diode are right
The D1 and D2 in Fig. 3 are answered, they are the commutation diodes of high-power, reverse high pressure；In storage capacitor corresponding diagram 3
C1, C2, C3, they are the electric capacity of the big high pressure of capacitance.Vc L in the base stage corresponding diagram 3 of first switch, second switch
Vc H in base stage corresponding diagram 3.
Infrared power adjustment module combination pfc circuit regulation infrared power in MCU belongs to the side that voltage-type adjusts power
Formula, its concrete principle is as follows：
When infrared power adjustment module sends the pwm signal of full dutycycle to the base stage Vc L of first switch, and to second
When the base stage Vc H of switch send the pwm signal of zero dutycycle closest, i.e., first switch Q1 standard-sized sheets, second switch Q2 are fully closed, and half-wave is whole
After civil power after stream is through inductance L1 and storage capacitor (C1, C2, C3) rectifying and wave-filtering voltage stabilizing, 310V or so is provided to infrared heating film
Galvanic current pressure.
When needing to reduce power output, infrared power adjustment module sends certain dutycycle to the base stage Vc L of first switch
Pwm signal, to second switch base stage Vc H send zero dutycycle closest pwm signal when, i.e. first switch Q1 intervals sexual openness,
Second switch Q2 is fully closed.When first switch Q1 is turned on, the civil power after rectification is through inductance L1, the second diode D2 to storage capacitor
(C1, C2, C3) charges, and simultaneously flows through infrared heating film, infrared heating film is persistently produced heat.In first switch Q1 cut-offs
When, due to inductive effect inductance L1 keep current flow flow to it is constant, continue give storage capacitor (C1, C2, C3) charge, while stream
Through infrared heating film, infrared heating film is set to produce power output.
Infrared power adjustment module is bigger to the pwm signal dutycycle that the base stage Vc L of first switch Q1 send, inductance L1
Bigger with the energy that storage capacitor (C1, C2, C3) is stored, the operating voltage of infrared heating film is higher, corresponding infrared heating film
Power output is bigger.Second switch Q2 is fully closed, the power of infrared heating film is adjusted using first switch Q1, infrared heating film
Operating voltage can be adjusted in the range of 0 to 310V.
When needing to increase power, infrared power adjustment module sends the PWM of full dutycycle to the base stage Vc L of first switch
Signal, and when sending the pwm signal of certain dutycycle to the base stage Vc H of second switch, i.e. first switch Q1 standard-sized sheets, second opens
Close Q2 interval sexual openness.When second switch Q2 is turned on, the civil power after rectification after inductance L1 by second switch Q2 shorted to earths,
Inductance L1 has high current to flow through；Due to the damping action of the second diode D2, the electric current of storage capacitor (C1, C2, C3) cannot be through
Second switch Q2 flows to ground, continues through the electric discharge of infrared heating film, infrared heating film is proceeded power output.Open when second
When closing Q2 cut-offs, inductance is constant because inductive effect L1 keeps current flow to flow to, and the electric current of inductance L1 is through the second diode D2
Charged to storage capacitor (C1, C2, C3), simultaneously flow through infrared heating film, infrared heating film is persistently produced heat.
Infrared power adjustment module is bigger to the pwm signal dutycycle that the base stage VcH of second switch sends, inductance L1 and storage
Can electric capacity (C1, C2, C3) storage energy it is bigger, the operating voltage of infrared heating film is bigger, and (maximum working voltage can reach
550V) corresponding infrared heating film power output is bigger.By first switch Q1 standard-sized sheets, infrared heating is adjusted using second switch Q2
The power of film, the operating voltage of infrared heating film can be adjusted in the range of 310 to 550V.
It will be apparent that the concrete form of infrared heating drive circuit and infrared heating circuit is not limited by the present embodiment, appoint
What should be included in the application protection domain using the feasible form that prior art is obtained is no.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that, technical scheme is carried out various combinations,
Modification or equivalent, without departure from the spirit and scope of technical solution of the present invention, all should cover will in right of the invention
Ask in the middle of scope.
Claims (11)
1. a kind of electromagnetic heating apparatus, it is characterised in that including：
Electromagnetic Heating unit, infrared heating unit and MCU,
The MCU is connected with the Electromagnetic Heating unit and infrared heating unit, to control the Electromagnetic Heating unit and described
Infrared heating unit is individually heated or heated simultaneously.
2. electromagnetic heating apparatus according to claim 1, it is characterised in that：The MCU includes inspection pot module and power point
With module；
In the presence of the inspection pot module does not detect cooking apparatus, the power distribution module is to the infrared heating unit
The heating power distributed with the Electromagnetic Heating unit is zero；In the presence of the inspection pot module detects cooking apparatus, institute
State power distribution module and distribute heating power at least one of the infrared heating unit and the Electromagnetic Heating unit.
3. electromagnetic heating apparatus according to claim 2, it is characterised in that the Electromagnetic Heating unit includes：
Resonance circuit, the resonance circuit includes switch element, resonant capacitance and resonant inductance, the resonant capacitance and resonance electricity
Sense is in parallel, and one of public connecting end of the resonant capacitance and resonant inductance is electrically connected with the city after rectification, and another is public
Connection end is connected with the colelctor electrode of the switch element altogether；
Circuit driven by electromagnetic means, one end of the drive circuit is connected with the electromagnetic power adjustment module in the MCU, the other end with
The base stage connection of the switch element；
Resonance sync detection circuit, one end is connected with the colelctor electrode of the switch element, to detect the switch element colelctor electrode
Voltage, the connection of the other end and the MCU；
After the MCU sends inspection pot pulse to the circuit driven by electromagnetic means, the inspection pot module is synchronously examined according to the resonance
Whether voltage that slowdown monitoring circuit is exported upset number of times whether there is judging the cooking apparatus less than predetermined number of times.
4. electromagnetic heating apparatus according to claim 1, it is characterised in that：The MCU includes wood properly test module and work(
Rate distribute module, when the wood properly test module detects the cooking apparatus of irony magnetic, the power distribution module switching
The cooking apparatus is heated to the Electromagnetic Heating unit and/or the infrared heating unit is started；When the wood properly test mould
When block detects the cooking apparatus of non iron magnetic, the power distribution module switches to the startup infrared heating unit heating
The cooking apparatus.
5. electromagnetic heating apparatus according to claim 4, it is characterised in that：The MCU includes heating switching prompting module,
Cooking apparatus material of the heating switching prompting module according to detected by wood properly test module, reminds user that selection is corresponding
Heating unit heats.
6. electromagnetic heating apparatus according to claim 4, it is characterised in that：
The Electromagnetic Heating unit includes：
Resonance circuit, the resonance circuit includes switch element, resonant capacitance and resonant inductance, the resonant capacitance and resonance electricity
Sense is in parallel, and one of public connecting end of the resonant capacitance and resonant inductance is electrically connected with the city after rectification, and another is public
Connection end is connected with the colelctor electrode of the switch element altogether；
Circuit driven by electromagnetic means, one end of the drive circuit is connected with the MCU, and the other end connects with the base stage of the switch element
Connect；
Resonance sync detection circuit, one end is connected with the colelctor electrode of the switch element, to detect the switch element colelctor electrode
Voltage, the other end is connected with the MCU；
After the MCU sends inspection pot pulse to the circuit driven by electromagnetic means, the wood properly test module is described humorous by detecting
The interval time of the adjacent turnover voltage of the sync detection circuit that shakes output judges the material of the cooking apparatus.
7. electromagnetic heating apparatus according to claim 1 to 6 any one, it is characterised in that the infrared heating unit
Including infrared heating circuit and infrared driver circuit；The infrared heating circuit have be connected between civil power zero line and live wire
Infrared heating film, one end of the infrared driver circuit is connected between the infrared heating film and civil power, the infrared driving
The other end of circuit is connected with the infrared power adjustment module in the MCU, and the infrared power adjustment module is according to being distributed
Heating power value to the infrared driver circuit be input into the second predetermined duty cycle pwm signal.
8. electromagnetic heating apparatus according to claim 7, it is characterised in that：The Electromagnetic Heating unit is also examined including zero passage
Slowdown monitoring circuit, described zero cross detection circuit one end electrically connects with the city after rectification, to detect the zero cross signal of civil power, the other end and institute
State MCU connections；
The zero cross signal that the MCU is detected according to the zero cross detection circuit is in the predetermined time to the infrared driver circuit
It is input into the pwm signal of the predetermined duty cycle.
9. electromagnetic heating apparatus according to claim 7, it is characterised in that：The infrared driver circuit includes energy storage electricity
Appearance, first switch, inductance and the first diode, the energy storage capacitor in series are described between the infrared heating film and civil power
One end that storage capacitor is connected with infrared heating film is connected by the inductance with the source electrode of the first switch, the energy storage electricity
Hold the one end electrically connected with the city to be connected with the source electrode of the first switch by the first diode, the leakage of the first switch
Pole electrically connects with the city, and the grid of the first switch is connected with the infrared power adjustment module of the MCU.
10. electromagnetic heating apparatus according to claim 9, it is characterised in that：The infrared driver circuit also includes second
The public connecting end of switch and the second diode, the inductance and the storage capacitor is connected with the drain electrode of the second switch,
Civil power is connected with the source electrode of the second switch, and second diode is connected to the drain electrode and the energy storage of the second switch
Between electric capacity.
11. electromagnetic heating apparatus according to claim 7, it is characterised in that：The infrared driver circuit includes being connected to
Bidirectional triode thyristor between infrared heating film and civil power, and the bidirectional triode thyristor is connected to MCU infrared powers regulation mould
Isolation optocoupler between block.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510893598.6A CN106813269B (en) | 2015-11-27 | 2015-11-27 | Electromagnetic heating equipment |
| EP15909155.2A EP3312511B1 (en) | 2015-11-27 | 2015-12-28 | Electromagnetic heating device |
| PCT/CN2015/099259 WO2017088244A1 (en) | 2015-11-27 | 2015-12-28 | Electromagnetic heating device |
| JP2017561729A JP6692837B2 (en) | 2015-11-27 | 2015-12-28 | Electromagnetic heating device |
| US15/910,935 US10976055B2 (en) | 2015-11-27 | 2018-03-02 | Electromagnetic heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510893598.6A CN106813269B (en) | 2015-11-27 | 2015-11-27 | Electromagnetic heating equipment |
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| Publication Number | Publication Date |
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| CN106813269A true CN106813269A (en) | 2017-06-09 |
| CN106813269B CN106813269B (en) | 2020-06-19 |
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|---|---|---|---|
| CN201510893598.6A Active CN106813269B (en) | 2015-11-27 | 2015-11-27 | Electromagnetic heating equipment |
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| CN111026195A (en) * | 2019-12-30 | 2020-04-17 | 广东美控电子科技有限公司 | Power control device and method for oven |
| CN114680564A (en) * | 2020-12-29 | 2022-07-01 | 珠海优特智厨科技有限公司 | Cooking control method and device, storage medium and computer equipment |
| CN114680564B (en) * | 2020-12-29 | 2024-01-23 | 珠海优特智厨科技有限公司 | Cooking control method, cooking control device, storage medium and computer equipment |
| CN114625192A (en) * | 2022-05-17 | 2022-06-14 | 深圳市海泰微电子科技有限公司 | Air fryer control circuit based on single chip microcomputer |
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