CN106714354A - Electromagnetic heating device and control method thereof - Google Patents
Electromagnetic heating device and control method thereof Download PDFInfo
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- CN106714354A CN106714354A CN201510779881.6A CN201510779881A CN106714354A CN 106714354 A CN106714354 A CN 106714354A CN 201510779881 A CN201510779881 A CN 201510779881A CN 106714354 A CN106714354 A CN 106714354A
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Abstract
The invention discloses an electromagnetic heating device and a control method thereof. The electromagnetic heating device comprises a heating resonant module, a switch tube which is connected with the heating resonant module, a voltage divider module which is connected with the heating resonant module and is used for carrying out voltage dividing processing on the voltage of the heating resonant module so as to output a voltage dividing signal, a driving module which is connected with the switch tube and is used for driving the turn-on and turn-off of the switch tube, and a control module which is connected to the voltage divider module and the driving module and is used for sampling the voltage dividing signal to generate a voltage sampling value, obtaining the best turn-on time of the switch tube according to the voltage sampling value, and generating a turn-on control signal according to the best turn-on time so as to drive the switch tube to be turned on at the best turn-on time through the driving module. An additional control circuit is not needed, the state of the heating resonant module can be accurately tracked, the best turn-on time is automatically detected to control the turn-on of the switch tube, and high loss turn-on is avoided.
Description
Technical field
The present invention relates to electromagnetic heating technique field, the control method and a kind of electromagnetism of more particularly to a kind of electromagnetic heater add
Thermal.
Background technology
A kind of electromagnetic heater proposed in correlation technique includes：Resonance heating module, resonance heating module is included mutually simultaneously
The resonance coil and resonant capacitance of connection；Switch module is connected with resonance heating module；Sampling module is connected with switch module, adopts
The electric current of egf block sampling switch module is generating voltage signal；Synchronous detection module is connected with sampling module, in switch module
Synchronously detect the voltage signal of sampling module generation to generate detection signal when turning on and off；Synchronous feedback module is connected to humorous
Shake the two ends of heating module, the voltage generation feedback signal according to resonance heating module two ends；Control module is anti-with synchronous respectively
Feedback module, synchronous detection module are connected with switch module, when detection signal is abnormal according to feedback signal adjustment output to switch
The control signal of module is realizing the control to switch module.
But, switch module zero is realized by way of sampling module, synchronous detection module, synchronous feedback module mating reaction
Voltage is open-minded, and circuit is complex, and control is complicated, and does not detect IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) voltage when opening, belong to that voltage is blind to open situation, it is likely that in electricity higher
IGBT is opened during pressure and damage IGBT.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned technology to a certain extent.Therefore, one of the invention
Purpose is to propose a kind of electromagnetic heater, without increasing extra control circuit, is heated by control module real-time monitoring
The voltage of resonance modules, the state of accurate tracking heating resonance modules, the optimal start-up time of automatic detection realizes switch tube
Real-time control, it is to avoid loss high is open-minded.
It is another object of the present invention to propose a kind of control method of electromagnetic heater.
To reach above-mentioned purpose, a kind of electromagnetic heater that first aspect present invention embodiment is proposed, including：Heating resonance
Module；Switching tube, the switching tube is connected with the heating resonance modules；Division module, the division module adds with described
Hot resonance modules are connected, and the division module is used to that the voltage of the heating resonance modules to be carried out voltage division processing to export partial pressure
Signal；Drive module, the drive module is connected with the switching tube, and the drive module is used to drive the switching tube
Turn-on and turn-off；Control module, the control module is connected with the division module and the drive module respectively, the control
Molding block is used to sample the voltage division signal to generate voltage sample value, and according to the voltage sample value is obtained
The optimal start-up time of switching tube, and control signal is opened with by the driving mould according to the optimal start-up time generation
Block drives the switching tube to be turned in the optimal start-up time.
Electromagnetic heater according to embodiments of the present invention, is carried out at partial pressure by division module to the voltage for heating resonance modules
Reason to export voltage division signal, then to voltage division signal sampled to generate voltage sample value, and is adopted according to voltage by control module
Sample value obtains the optimal start-up time of switching tube, and opens control signal according to the generation of optimal start-up time, so by driving
Dynamic model block driving switch pipe is turned in optimal start-up time, therefore, the electromagnetic heater of the embodiment of the present invention need not increase volume
Outer control circuit, the voltage of resonance modules, the shape of accurate tracking heating resonance modules are heated by control module real-time monitoring
State, the optimal start-up time of automatic detection, realize the real-time control of switch tube, it is to avoid loss high is open-minded.
According to one embodiment of present invention, the control module includes：High-speed ADC sampling unit, the high-speed ADC is adopted
Sample unit is connected with the division module, and the high-speed ADC sampling unit is used to sample the voltage division signal to generate
The voltage sample value；Synchronization unit, the synchronization unit is connected with the high-speed ADC sampling unit, the synchronization unit
For judging the voltage sample value, and when the voltage sample value be more than 0 when the synchronization unit to the voltage
Sampled value carries out calculating treatment obtaining voltage knee value, and obtains the optimal start-up time according to the voltage knee value；
Controller, the controller is connected with the synchronization unit, and the controller is used for according to the optimal start-up time generation institute
State and open control signal.
According to one embodiment of present invention, when the voltage sample value is less than or equal to 0, the synchronization unit is directly sentenced
Fixed is now the optimal start-up time.
According to one embodiment of present invention, when the voltage knee value is 0 or voltage knee value is less than preset value, institute
State synchronization unit and judge to be now the optimal start-up time.
According to one embodiment of present invention, the control module also includes filter unit, and the filter unit is connected to described
Between high-speed ADC sampling unit and the synchronization unit, the filter unit is used to be filtered place to the voltage sample value
Reason.
According to one embodiment of present invention, when the voltage sample value is more than 0, the synchronization unit uses differential algorithm pair
The voltage sample value calculate treatment to obtain the voltage knee value.
Specifically, according to one embodiment of present invention, the switching tube is IGBT, and the voltage of the heating resonance modules is
The collector voltage of the IGBT, the electromagnetic heater also includes diode, the anode of the diode and the IGBT
Emitter stage be connected, the negative electrode of the diode is connected with the colelctor electrode of the IGBT.
To reach above-mentioned purpose, second aspect present invention embodiment proposes a kind of control method of electromagnetic heater, wherein,
The electromagnetic heater includes heating resonance modules, switching tube and drive module, and the control method is comprised the following steps：
Voltage to the heating resonance modules carries out voltage division processing to export voltage division signal；The voltage division signal is sampled with life
Into voltage sample value, and the optimal start-up time of the switching tube is obtained according to the voltage sample value；And according to it is described most
Good start-up time generation is opened control signal and drives the switching tube to be led in the optimal start-up time with by the drive module
It is logical.
The control method of electromagnetic heater according to embodiments of the present invention, carries out partial pressure to the voltage for heating resonance modules first
Then treatment is sampled to generate voltage sample value, and obtained according to voltage sample value with exporting voltage division signal to voltage division signal
The optimal start-up time of switching tube is taken, control signal is opened finally according to the generation of optimal start-up time, so by drive module
Driving switch pipe is turned in optimal start-up time, so that electromagnetic heater need not increase extra control circuit, with regard to energy
Enough real-time monitorings heat the voltage of resonance modules, accurately the state of tracking heating resonance modules, the optimal start-up time of automatic detection,
Realize the real-time control of switch tube, it is to avoid loss high is open-minded.
According to one embodiment of present invention, the optimal start-up time that the switching tube is obtained according to the voltage sample value,
Specifically include：The voltage sample value is judged；When the voltage sample value is more than 0, to the voltage sample value
Carry out calculating treatment obtaining voltage knee value, and the optimal start-up time is obtained according to the voltage knee value.
According to one embodiment of present invention, the optimal start-up time that the switching tube is obtained according to the voltage sample value,
Also include：When the voltage sample value is less than or equal to 0, directly judge to be now the optimal start-up time.
According to one embodiment of present invention, when the voltage knee value is 0 or voltage knee value is less than preset value, sentence
Fixed is now the optimal start-up time.
According to one embodiment of present invention, when the voltage sample value is more than 0, the voltage is adopted using differential algorithm
Sample value calculate treatment to obtain the voltage knee value.
According to one embodiment of present invention, before judging the voltage sample value, also to the voltage sample value
It is filtered treatment.
Brief description of the drawings
Fig. 1 is the circuit diagram of the electromagnetic heater according to one embodiment of the invention；
Fig. 2 is the flow chart of the control algolithm of the synchronization unit according to one embodiment of the invention；
Fig. 3 is according to a control sequential figure for specific embodiment of the invention；And
Fig. 4 is the flow chart of the control method of the electromagnetic heater according to the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from start to finish
Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The control of the electromagnetic heater and electromagnetic heater of proposition according to embodiments of the present invention described with reference to the accompanying drawings
Method processed.
Fig. 1 is the circuit diagram of the electromagnetic heater according to one embodiment of the invention.With reference to shown in Fig. 1, the electromagnetism
Heater includes heating resonance modules 10, switching tube 20, division module 30, drive module 40 and control module 50.Its
In, electromagnetic heater can be the Electromagnetic Heating products such as electromagnetic oven.
As shown in figure 1, heating resonance modules 10 are constituted and are for example formed in parallel by resonance coil L, resonant capacitance C, alternating current
By being powered to heating resonance modules 10 after rectifying and wave-filtering, switching tube 20 is connected to control heating with heating resonance modules 10 in source
Resonance modules 10 carry out resonant operational.Division module 30 with heating resonance modules 10 be connected, division module 30 be used for pair add
The voltage of hot resonance modules 10 carries out voltage division processing to export voltage division signal, for example, heat the maximum voltage of resonance modules 10
Vcmax ≈ 1350V, carry out voltage division processing and are converted to low pressure (such as≤5V) with high pressure by division module 30, then defeated
Enter to control module 50.
As shown in figure 1, drive module 40 is connected with switching tube 20, drive module 40 is used for the conducting of driving switch pipe 20
And shut-off.Wherein, according to one embodiment of present invention, as shown in Fig. 2 switching tube 20 can be IGBT, and IGBT
Colelctor electrode respectively with heating resonance modules 10 and division module 30 be connected, the grounded emitter of IGBT, the gate pole of IGBT and
Drive module 40 is connected, and reverse parallel connection has diode D1, the i.e. anode of diode D1 between the colelctor electrode and emitter stage of IGBT
It is connected with the emitter stage of IGBT, the negative electrode of diode D1 is connected with the colelctor electrode of IGBT, therefore heats the voltage of resonance modules
The as collector voltage of IGBT.
In an embodiment of the present invention, as shown in figure 1, control module 50 respectively with division module 30 and the phase of drive module 40
Even, control module 50 is used to sample voltage division signal to generate voltage sample value, and obtains switch according to voltage sample value
The optimal start-up time of pipe 20, and open control signal and driven with by drive module 40 according to the generation of optimal start-up time
Switching tube 20 is turned in optimal start-up time.In short, Vc voltage division signal controlling switch pipe of the control module 50 according to input
20, so as to realize the real-time control to heating resonance modules 10.
Therefore says, the electromagnetic heater of the embodiment of the present invention pass through such as MCU of control module 50 (Micro Control Unit,
Microcontroller is single-chip microcomputer) real-time monitoring heats the voltage of resonance modules, the state of accurate tracking heating resonance modules, automatically
Optimal start-up time is detected, controlling switch pipe is turned in optimal start-up time.
Electromagnetic heater according to embodiments of the present invention, is carried out at partial pressure by division module to the voltage for heating resonance modules
Reason to export voltage division signal, then to voltage division signal sampled to generate voltage sample value, and is adopted according to voltage by control module
Sample value obtains the optimal start-up time of switching tube, and opens control signal according to the generation of optimal start-up time, so by driving
Dynamic model block driving switch pipe is turned in optimal start-up time, therefore, the electromagnetic heater of the embodiment of the present invention need not increase volume
Outer control circuit, the voltage of resonance modules, the shape of accurate tracking heating resonance modules are heated by control module real-time monitoring
State, the optimal start-up time of automatic detection, realize the real-time control of switch tube, it is to avoid loss high is open-minded.
According to one embodiment of present invention, as shown in figure 1, control module 50 includes：High-speed ADC sampling unit 501,
Synchronization unit 502 and controller CPU (Central Processing Unit, CPU).Wherein, high-speed ADC
Sampling unit 501 is connected with division module 30, and ADC sampling units 501 are used to sample Vc voltage division signals to generate
Voltage sample value, synchronization unit 502 is connected with high-speed ADC sampling unit 501, and synchronization unit 502 is used for voltage sample
Value is judged, and synchronization unit 502 to voltage sample value calculate treatment to obtain electricity when voltage sample value is more than 0
Pressure knee value K, and optimal start-up time is obtained according to voltage knee value K, controller CPU is connected with synchronization unit 502,
Controller CPU is used to open control signal according to the generation of optimal start-up time.Wherein, the synchronization when voltage sample value is more than 0
Unit 502 can use differential algorithm that calculating is carried out to voltage sample value and process to obtain voltage knee value K, voltage knee value K
Flex point obtained from differential calculation is carried out by Vc real-time voltages.
That is, the built-in high-speed ADCs of control module MCU, synchronization unit, CPU, after high-speed ADC sampling Vc voltage signals,
Voltage sample value is sent to synchronization unit, the built-in zero point of synchronization unit and minimum point detection algorithm, line number is entered to voltage sample value
According to enabling signal is sent after treatment to CPU, control signal is opened in CPU outputs.
According to one embodiment of present invention, when voltage sample value is less than or equal to 0, synchronization unit 502 directly judges this
When be optimal start-up time.Also, it is synchronous when voltage knee value K is that 0 or voltage knee value K is less than preset value K0
Unit 502 judges to be now optimal start-up time.
Wherein, control module also includes filter unit such as RC wave filters, and filter unit is connected to ADC units and synchronization unit
Between, filter unit is used to be filtered treatment to voltage sample value.
Specifically, as shown in Fig. 2 the input of synchronization unit 502 is connected to the output end of high-speed ADC sampling unit 501,
The output end of synchronization unit 502 is connected to the kernel CPU of MCU.Wherein, synchronization unit 502 can be filled according to Electromagnetic Heating
The watt level adjust automatically synchronization parameter put, such as under high power, Rule of judgment is K=0；Under middle power, Rule of judgment
It is K=0 or K<K0 (preset value K0 is adjustable)；Under low-power, Rule of judgment is K<K0 (preset value K0 is adjustable), K0's is big
It is small to follow changed power, generally, the K0s of the K0 more than or equal to low-power of middle power.502 pairs of high speeds of synchronization unit
The voltage sample value of the output of ADC sampling units 501 carries out digital RC filtering, and filtered data are then passed through differential algorithm
Calculate voltage knee value.Calculating voltage knee value by differential algorithm has multiple parallel Rule of judgment, and the first is that voltage is adopted
Sample value is less than or equal to 0, and complicated differential algorithm is not needed now, directly judges that optimal start-up time arrives, enabling signal
CPU is fed back to, control signal is opened in CPU generations；Second is that voltage sample value is more than 0, now needs to call differential algorithm,
At least need two groups of real-time voltages of Vc, the V2 that the V1 and tb moment that respectively the ta moment gathers gathers, sample frequency
Can be configured according to actual conditions, the V1 and V2 for sampling store (the absolute value of V2 and V1 in buffer BUFFER
It is respectively smaller than the maximum of Vc), for differential calculation voltage knee, wherein, differential formulas：K=(V2-V1)/(tb-ta),
As K=0 or K<During K0, judge that optimal start-up time arrives, enabling signal is fed back to CPU, control is opened in CPU generations
Signal.Vc is minimum under wherein K=0 is applied to high power, and K0 is the value of preset in advance, can be according to the ceiling voltage of Vc, LC
Harmonic period, alternating voltage carry out periodicity adjustment or instantaneous adjustment.
Therefore say that the electromagnetic heater of the embodiment of the present invention realizes electricity using the built-in high-speed ADCs of MCU and synchronization unit
Pressure flex point detection, the on off state for being capable of real-time adjustment power switch pipe such as IGBT is open-minded to realize no-voltage and minimum voltage
IGBT, it is to avoid IGBT is high, and loss is open-minded, so as to reduce turn-on consumption, reduces switch heating, improves service life.Also,
Extra hardware circuit need not be increased, so as to simplify the external circuit of controller, additionally it is possible to so that electromagnetic heater is automatic
The frequency of heating resonance modules is adapted to, to pan material, size, position etc. with extremely strong adaptability, Electromagnetic Heating is realized
The more high-precision Power Control of device.
Wherein, electromagnetic heater can be electromagnetic oven.As shown in figure 3, when electromagnetic oven is operated in high power, Vc voltages
Zero point can be descended to, the IGBT Vce1 waveforms of such as Fig. 3, t1 moment, IGBT is closed, Vc voltages are in sinusoidal variations；
T2 moment, Vc voltages are down to zero point, and MCU detects the state, and control signal is opened in CPU outputs, and IGBT prepares conducting；
T2~t3 moment, IGBT conductings, Vc voltage lockout zero points.When electromagnetic oven is operated in low-power, Vc voltages cannot be down to
The IGBT Vce2 waveforms of zero point, such as Fig. 3, t1 moment, IGBT is closed, and Vc voltages are in sinusoidal variations；T2 moment, Vc
Voltage is reduced as far as possible, and MCU detects the state, and control signal is opened in CPU outputs, and IGBT prepares conducting；T2~t3 moment,
IGBT is turned on, and Vc is slowly drop down to zero point, and remains zero.In IGBT Vce2, the t2 moment is in the whole Vc cycles
Minimum point, is that IGBT opens the loss minimum moment firmly, if t2 moment IGBT is not turned on, Vc waveforms can to t4 when
Carve and extend, voltage is gradually raised, and misses optimal cut-in voltage.
And the electromagnetic heater of the embodiment of the present invention using control module real-time monitoring heat resonance modules voltage, accurately with
Track heats the state of resonance modules, and by zero point built-in in synchronization unit and minimum point detection algorithm, automatic detection is most preferably opened
Open the moment, controlling switch pipe is that IGBT is turned in optimal start-up time, so as to reduce turn-on consumption, reduce switch heating, carry
Service life high.
Fig. 4 is the flow chart of the control method of the electromagnetic heater according to the embodiment of the present invention, wherein, Electromagnetic Heating dress
Put can be above-described embodiment description electromagnetic heater, including heating resonance modules, switching tube and drive module.As schemed
Shown in 4, the control method of the electromagnetic heater is comprised the following steps：
S1, the voltage to heating resonance modules carries out voltage division processing to export voltage division signal.
Wherein, voltage division processing can be carried out to export voltage division signal to the voltage for heating resonance modules by division module.
S2, is sampled to generate voltage sample value, and obtain most preferably opening for switching tube according to voltage sample value to voltage division signal
Open the moment.
According to one embodiment of present invention, the optimal start-up time that switching tube is obtained according to voltage sample value in step S2,
Specifically include：Voltage sample value is judged；When voltage sample value is more than 0, calculating treatment is carried out to voltage sample value
To obtain voltage knee value, and optimal start-up time is obtained according to voltage knee value.
Wherein, when voltage sample value is more than 0, differential algorithm can be used to voltage sample value calculate treatment to obtain electricity
Pressure knee value
Also, the optimal start-up time that switching tube is obtained according to voltage sample value in step S2, also includes：Work as voltage sample
When value is less than or equal to 0, directly judge to be now optimal start-up time.
Wherein, when voltage knee value is 0 or voltage knee value is less than preset value, judge to be now optimal start-up time.
According to one embodiment of present invention, before judging voltage sample value, also voltage sample value is filtered
Treatment, filtering interference signals.
S3, according to optimal start-up time generation open control signal with by drive module driving switch pipe in optimal start-up time
Conducting.
The control method of electromagnetic heater according to embodiments of the present invention, carries out partial pressure to the voltage for heating resonance modules first
Then treatment is sampled to generate voltage sample value, and obtained according to voltage sample value with exporting voltage division signal to voltage division signal
The optimal start-up time of switching tube is taken, control signal is opened finally according to the generation of optimal start-up time, so by drive module
Driving switch pipe is turned in optimal start-up time, so that electromagnetic heater need not increase extra control circuit, with regard to energy
Enough real-time monitorings heat the voltage of resonance modules, accurately the state of tracking heating resonance modules, the optimal start-up time of automatic detection,
Realize the real-time control of switch tube, it is to avoid loss high is open-minded.
Wherein, according to one embodiment of present invention, the built-in high-speed ADC, same in the control module MCU of electromagnetic heater
Voltage sample value, after high-speed ADC sampling Vc voltage signals, is sent to synchronization unit by step unit, CPU, and synchronization unit is built-in
Zero point and minimum point detection algorithm, enabling signal is sent to CPU after data processing is carried out to voltage sample value, and CPU outputs are open-minded
Control signal is turned on controlling switch pipe.
Specifically, synchronization unit can be according to the watt level adjust automatically synchronization parameter of electromagnetic heater, such as high power
Under, Rule of judgment is K=0；Under middle power, Rule of judgment is K=0 or K<K0 (preset value K0 is adjustable)；Under low-power, sentence
Broken strip part is K<K0 (preset value K0 is adjustable), the size of K0 follows changed power, and generally, the K0 of middle power is more than
Equal to the K0 of low-power.Synchronization unit carries out digital RC filtering to the voltage sample value that high-speed ADC sampling unit is exported, so
Filtered data are calculated voltage knee value by differential algorithm afterwards.Calculating voltage knee value by differential algorithm has multiple simultaneously
Capable Rule of judgment, the first is the differential algorithm that voltage sample value need not be complicated less than or equal to 0, now, is directly judged
Optimal start-up time is arrived, and enabling signal is fed back to CPU, and control signal is opened in CPU generations；Second is voltage sample value
More than 0, now need to call differential algorithm, i.e., at least need two groups of real-time voltages of Vc, the V1 that respectively the ta moment gathers
The V2 gathered with the tb moment, sample frequency can be configured according to actual conditions, and V1 and the V2 storage for sampling are in buffering
In device BUFFER (absolute value of V2 and V1 will be respectively smaller than the maximum of Vc), for differential calculation voltage knee, wherein,
Differential formulas：K=(V2-V1)/(ta-tb), as K=0 or K<During K0, judge that optimal start-up time arrives, believe starting
CPU number is fed back to, control signal is opened in CPU generations.Vc is minimum under wherein K=0 is applied to high power, and K0 is preset in advance
Value, periodicity adjustment or instantaneous adjustment can be carried out according to the ceiling voltage of Vc, LC harmonic periods, alternating voltage.
Therefore say, in an embodiment of the present invention, realize that voltage knee is examined using the built-in high-speed ADCs of MCU and synchronization unit
Survey, the on off state for being capable of real-time adjustment power switch pipe such as IGBT opens IGBT to realize no-voltage and minimum voltage,
Avoid IGBT losses high open-minded, so as to reduce turn-on consumption, reduce switch heating, improve service life.Also, need not
Increase extra hardware circuit, so as to simplify the external circuit of controller, additionally it is possible to so that electromagnetic heater is adapted to automatically
The frequency of resonance modules is heated, to pan material, size, position etc. with extremely strong adaptability, electromagnetic heater is realized
More high-precision Power Control.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ",
" outward ", the orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on
Orientation shown in the drawings or position relationship, are for only for ease of and describe of the invention and simplify description, rather than instruction or hint institute
The device or element of finger must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this hair
Bright limitation.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed
Or implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two
It is individual, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation "
Should be interpreted broadly Deng term, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be
Mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of individual element internal or two interaction relationships of element, unless otherwise clearly restriction.It is common for this area
For technical staff, above-mentioned term concrete meaning in the present invention can be as the case may be understood.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can
Being the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, the
One feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or
Oblique upper, or fisrt feature level height is merely representative of higher than second feature.Fisrt feature second feature " under ",
" lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or to be merely representative of first special
Level height is levied less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. mean to combine the specific features of the embodiment or example description, structure, material or
Feature is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term
Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be with
Combined in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, ability
The technical staff in domain can enter the feature of the different embodiments or example described in this specification and different embodiments or example
Row is combined and combined.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment be it is exemplary,
It is not considered as limiting the invention, one of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, changes, replacing and modification.
Claims (13)
1. a kind of electromagnetic heater, it is characterised in that including：
Heating resonance modules；
Switching tube, the switching tube is connected with the heating resonance modules；
Division module, the division module is connected with the heating resonance modules, and the division module is used for humorous to the heating
The voltage of module of shaking carries out voltage division processing to export voltage division signal；
Drive module, the drive module is connected with the switching tube, and the drive module is used to drive leading for the switching tube
Logical and shut-off；
Control module, the control module is connected with the division module and the drive module respectively, and the control module is used
In being sampled to generate voltage sample value to the voltage division signal, and the switching tube is obtained according to the voltage sample value
Optimal start-up time, and control signal is opened with by drive module driving institute according to the optimal start-up time generation
Switching tube is stated to be turned in the optimal start-up time.
2. electromagnetic heater as claimed in claim 1, it is characterised in that the control module includes：
High-speed ADC sampling unit, the high-speed ADC sampling unit is connected with the division module, the high-speed ADC sampling
Unit is used to that the voltage division signal to be sampled to generate the voltage sample value；
Synchronization unit, the synchronization unit is connected with the high-speed ADC sampling unit, and the synchronization unit is used for the electricity
Pressure sampled value is judged, and the synchronization unit is counted to the voltage sample value when the voltage sample value is more than 0
Calculate treatment to obtain voltage knee value, and the optimal start-up time is obtained according to the voltage knee value；
Controller, the controller is connected with the synchronization unit, and the controller is used to be given birth to according to the optimal start-up time
Control signal is opened into described.
3. electromagnetic heater as claimed in claim 2, it is characterised in that when the voltage sample value is less than or equal to 0
When, the synchronization unit directly judges to be now the optimal start-up time.
4. electromagnetic heater as claimed in claim 2, it is characterised in that when the voltage knee value is 0 or voltage
When knee value is less than preset value, the synchronization unit judges to be now the optimal start-up time.
5. electromagnetic heater as claimed in claim 2, it is characterised in that the control module also includes filter unit,
The filter unit is connected between the high-speed ADC sampling unit and the synchronization unit, and the filter unit is used for institute
State voltage sample value and be filtered treatment.
6. electromagnetic heater as claimed in claim 2, it is characterised in that described in when the voltage sample value is more than 0
Synchronization unit uses differential algorithm that calculating is carried out to the voltage sample value and processes to obtain the voltage knee value.
7. the electromagnetic heater as any one of claim 1-6, it is characterised in that the switching tube is IGBT,
The voltage of the heating resonance modules is the collector voltage of the IGBT, and the electromagnetic heater also includes diode, institute
The anode for stating diode is connected with the emitter stage of the IGBT, and the negative electrode of the diode is connected with the colelctor electrode of the IGBT.
8. a kind of control method of electromagnetic heater, it is characterised in that the electromagnetic heater include heating resonance modules,
Switching tube and drive module, the control method are comprised the following steps：
Voltage to the heating resonance modules carries out voltage division processing to export voltage division signal；
The voltage division signal is sampled to generate voltage sample value, and the switching tube is obtained according to the voltage sample value
Optimal start-up time；And
Control signal is opened according to the optimal start-up time generation and drives the switching tube described with by the drive module
Optimal start-up time conducting.
9. the control method of electromagnetic heater as claimed in claim 8, it is characterised in that described to be adopted according to the voltage
Sample value obtains the optimal start-up time of the switching tube, specifically includes：
The voltage sample value is judged；
When the voltage sample value is more than 0, to the voltage sample value calculate treatment to obtain voltage knee value, with
And the optimal start-up time is obtained according to the voltage knee value.
10. the control method of electromagnetic heater as claimed in claim 9, it is characterised in that described according to the voltage
Sampled value obtains the optimal start-up time of the switching tube, also includes：
When the voltage sample value is less than or equal to 0, directly judge to be now the optimal start-up time.
The control method of 11. electromagnetic heaters as claimed in claim 9, it is characterised in that when the voltage knee value
For 0 or voltage knee value be less than preset value when, judge to be now the optimal start-up time.
The control method of 12. electromagnetic heaters as claimed in claim 9, it is characterised in that when the voltage sample value
During more than 0, differential algorithm is used to the voltage sample value calculate treatment to obtain the voltage knee value.
The control method of 13. electromagnetic heaters as claimed in claim 9, it is characterised in that to the voltage sample
Before value is judged, treatment also is filtered to the voltage sample value.
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| CN112859958A (en) * | 2021-02-03 | 2021-05-28 | 广东顺德锐椒电器有限公司 | Induction cooker surface temperature control circuit and method |
| CN113923812A (en) * | 2021-10-29 | 2022-01-11 | 广东美的厨房电器制造有限公司 | Microwave heating device, control method and storage medium |
| CN114205941A (en) * | 2020-09-18 | 2022-03-18 | 杭州九阳小家电有限公司 | Electromagnetic heating control circuit and method |
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| CN109661053A (en) * | 2017-10-11 | 2019-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating utensil, electromagnetic heating system and its sync control device |
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| CN112859958A (en) * | 2021-02-03 | 2021-05-28 | 广东顺德锐椒电器有限公司 | Induction cooker surface temperature control circuit and method |
| CN113923812A (en) * | 2021-10-29 | 2022-01-11 | 广东美的厨房电器制造有限公司 | Microwave heating device, control method and storage medium |
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