CN108419325A - Electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device - Google Patents
Electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device Download PDFInfo
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- CN108419325A CN108419325A CN201710075233.1A CN201710075233A CN108419325A CN 108419325 A CN108419325 A CN 108419325A CN 201710075233 A CN201710075233 A CN 201710075233A CN 108419325 A CN108419325 A CN 108419325A
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- electromagnetic heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- 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
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- Electromagnetism (AREA)
- General Induction Heating (AREA)
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Abstract
The invention discloses a kind of electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device, method includes the following steps：Obtain the target heating power of electromagnetic heating system；Judge whether target heating power is less than predetermined power；If target heating power is less than predetermined power, then in each controlling cycle, control electromagnetic heating system sequentially enters discharge regime, heating period and stop phase, wherein, the power switch tube of resonance circuit of multiple first pulse signals to electromagnetic heating system is provided in discharge regime, and multiple second pulse signals are provided to power switch tube in the heating period, the amplitude of first pulse signal is gradually increased to the second driving voltage from the first driving voltage, the amplitude of second pulse signal is the second driving voltage, and the first driving voltage is less than the second driving voltage.As a result, by pre-arcing mode, the pulse current of power switch tube can be inhibited, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
Description
Technical field
The present invention relates to household electrical appliance technical field, more particularly to a kind of method for heating and controlling of electromagnetic heating system, one
Heating control apparatus, a kind of electromagnetic heating system and a kind of electromagnetic heating apparatus of kind electromagnetic heating system.
Background technology
In the related technology, the electromagnetic resonant circuit generally use parallel resonance mode of single IGBT, and realizing high-power fortune
Resonant parameter is set under the premise of row, as shown in Figure 1, when being heated with high power, because resonant parameter matches, IGBT conductings
When leading voltage it is very small, the pulse current of IGBT is also very small.However, as shown in Fig. 2, using low-power heating when,
The leading voltage of IGBT is very high, causes the pulse current of IGBT very big, is particularly easy to the limit value that uses beyond IGBT, damage
IGBT。
In order to realize that low-power, the relevant technologies generally use duty ratio mode as shown in Figure 3 carry out interruption heating, such as
Heat 5s stop 5s by way of, realize 5/10 low-power, still, the relevant technologies the problem is that, if interruption plus
Heat cycle is longer, can influence cooking function, for example, cook congee when be easy to overflow, the culinary art experience of user is reduced, if interruption
Heating cycle is shorter, and IGBT can be caused firmly open-minded, and then causes the pulse current of IGBT very big, and noise is serious.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose be to propose a kind of method for heating and controlling of electromagnetic heating system, can inhibit the pulse electricity of power switch tube
Stream is, it can be achieved that the low-power of Millisecond duty ratio heats.
Second object of the present invention is to propose a kind of heating control apparatus of electromagnetic heating system, third of the invention
A purpose is to propose a kind of electromagnetic heating system.Fourth object of the present invention is to propose a kind of electromagnetic heating apparatus.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of computer heating control side of electromagnetic heating system
Method includes the following steps：Obtain the target heating power of the electromagnetic heating system；Judge whether the target heating power is small
In predetermined power；If the target heating power controls the electromagnetism less than the predetermined power in each controlling cycle
Heating system sequentially enters discharge regime, heating period and stop phase, wherein provides multiple first arteries and veins in the discharge regime
Signal is rushed to the power switch tube of the resonance circuit of the electromagnetic heating system so that the electric current for flowing through the power switch tube is small
Multiple second pulse signals are provided to the power switch tube, first arteries and veins in pre-set current value, and in the heating period
The amplitude for rushing signal is gradually increased to the second driving voltage from the first driving voltage, and the amplitude of second pulse signal is described
Second driving voltage, and first driving voltage is less than second driving voltage.
The method for heating and controlling of the electromagnetic heating system proposed according to embodiments of the present invention, when target heating power is less than in advance
If when power, in each controlling cycle, control electromagnetic heating system resonance circuit sequentially enter discharge regime, the heating period and
Stop phase, wherein provide multiple first pulse signals to the power switch tube of resonance circuit so as to flow through work(in discharge regime
The electric current of rate switching tube is less than pre-set current value, and provides multiple second pulse signals to power switch tube in the heating period, the
The amplitude of one pulse signal is gradually increased to the second driving voltage from the first driving voltage, and the amplitude of the second pulse signal is second
Driving voltage, and the first driving voltage is less than the second driving voltage.As a result, by pre-arcing mode, power switch can be inhibited
The pulse current of pipe, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
In addition, the method for heating and controlling of electromagnetic heating system according to the above embodiment of the present invention can also be with following attached
The technical characteristic added：
According to one embodiment of present invention, third driving voltage to the power is persistently exported in the stop phase to open
Guan Guan, to drive the power switch tube to turn off.
According to one embodiment of present invention, the pulse width of the multiple first pulse signal gradually increases.Wherein, often
The pulse width of a first pulse signal is all higher than equal to 0.1us and is less than or equal to 15us.The arteries and veins of first the first pulse signal
Width is rushed more than or equal to 0.1us and is less than or equal to 2us.
According to one embodiment of present invention, it is powered for the electromagnetic heating system by AC power, the method is also
Including：Obtain the voltage over zero of the AC power；The electromagnetic heating system is controlled according to the voltage over zero to enter
The discharge regime.
According to one embodiment of present invention, the method for heating and controlling of the electromagnetic heating system further includes：Entering
It after the discharge regime preset time or controls the electromagnetic heating system in the voltage over zero and enters the heating rank
Section, so that the discharge regime is in the zero passage voltage section constructed centered on the voltage over zero.Wherein, the electricity
It can be [- 5ms, 5ms] to press through zero section.
According to one embodiment of present invention, the pre-set current value is 85A.
According to one embodiment of present invention, first driving voltage is more than or equal to 5V and is less than or equal to 14.5V, described
Second driving voltage is more than or equal to 15V.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of computer heating control dress of electromagnetic heating system
It sets, including：Resonance circuit, the resonance circuit include power switch tube；Driving circuit, the driving circuit are opened with the power
The control terminal for closing pipe is connected, and the driving circuit is for driving the power switch tube；Control unit, described control unit and institute
It states driving circuit to be connected, described control unit is used to obtain the target heating power of the electromagnetic heating system, and described in judgement
Whether target heating power is less than predetermined power, and when the target heating power is less than the predetermined power, each
Controlling cycle controls the electromagnetic heating system and sequentially enters discharge regime, heating period and stop phase, wherein is put described
Driving circuit described in electric stage control provides multiple first pulse signals to the power switch tube so as to flow through power switch tube
Electric current be less than pre-set current value, and control the driving circuit in the heating period and provide multiple second pulse signals to institute
Power switch tube is stated, the amplitude of first pulse signal is to be gradually increased to the second driving voltage, institute from the first driving voltage
The amplitude for stating the second pulse signal is second driving voltage, and first driving voltage is less than the second driving electricity
Pressure.
The heating control apparatus of the electromagnetic heating system proposed according to embodiments of the present invention, when target heating power is less than in advance
If when power, sequentially entering discharge regime in the resonance circuit of each controlling cycle, control unit control electromagnetic heating system, adding
Hot stage and stop phase, wherein provide multiple first pulse signals to power switch tube in discharge regime control driving circuit
So that the electric current for flowing through power switch tube is less than pre-set current value, and multiple second arteries and veins are provided in heating period control driving circuit
Signal is rushed to power switch tube, the amplitude of the first pulse signal is to be gradually increased to the second driving voltage from the first driving voltage,
The amplitude of second pulse signal is the second driving voltage, and the first driving voltage is less than the second driving voltage.As a result, by putting in advance
Electric mode can inhibit the pulse current of power switch tube, and then realize the low-power heating of millisecond pole duty ratio, improve user
Experience.
In addition, the heating control apparatus of electromagnetic heating system according to the above embodiment of the present invention can also be with following attached
The technical characteristic added：
According to one embodiment of present invention, described control unit is additionally operable to persistently export third drive in the stop phase
Dynamic voltage is to the power switch tube, to drive the power switch tube to turn off.
According to one embodiment of present invention, the pulse width of the multiple first pulse signal gradually increases.Wherein, often
The pulse width of a first pulse signal is all higher than equal to 0.1us and is less than or equal to 15us, the arteries and veins of first the first pulse signal
Width is rushed more than or equal to 0.1us and is less than or equal to 2us.
According to one embodiment of present invention, it is powered for the electromagnetic heating system by AC power, described device is also
Including：Zero passage detection unit, the zero passage detection unit are connected with described control unit, and the zero passage detection unit is for obtaining
The voltage over zero of the AC power, described control unit are used to control the electromagnetic heating system according to the voltage over zero
System enters the discharge regime.
According to one embodiment of present invention, described control unit is additionally operable to after entering the discharge regime preset time
Or control the electromagnetic heating system in the voltage over zero and enter the heating period, so that the discharge regime is in
In the zero passage voltage section constructed centered on the voltage over zero.Wherein, the voltage zero-cross section is [- 5ms, 5ms].
According to one embodiment of present invention, the pre-set current value is 85A.
According to one embodiment of present invention, first driving voltage is more than or equal to 5V and is less than or equal to 14.5V, described
Second driving voltage is more than or equal to 15V.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of electromagnetic heating system, including described
The heating control apparatus of electromagnetic heating system.
The electromagnetic heating system proposed according to embodiments of the present invention can inhibit power switch tube by pre-arcing mode
Pulse current, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
In order to achieve the above objectives, fourth aspect present invention embodiment proposes a kind of electromagnetic heating apparatus, including described
Electromagnetic heating system.
The electromagnetic heating apparatus proposed according to embodiments of the present invention can inhibit power switch tube by pre-arcing mode
Pulse current, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
According to one embodiment of present invention, the electromagnetic heating apparatus is electromagnetic oven, electromagnetic stove, electromagnetic rice cooker or electricity
Magnetic pressure pot.
Description of the drawings
Fig. 1 is the drive waveforms schematic diagram of IGBT when electromagnetic heating system is heated with high power in the related technology；
Fig. 2 is the drive waveforms schematic diagram of IGBT when electromagnetic heating system is heated with low-power in the related technology；
Fig. 3 is duty ratio oscillogram when electromagnetic heating system is heated in a manner of duty ratio in the related technology；
Fig. 4 is the flow chart of the method for heating and controlling of electromagnetic heating system according to the ... of the embodiment of the present invention；
Fig. 5 is that the relation curve between the driving voltage and electric current of IGBT pipes accord to a specific embodiment of that present invention shows
It is intended to；
Fig. 6 is the principle schematic of the method for heating and controlling of electromagnetic heating system according to an embodiment of the invention；
Fig. 7 is the drive waveforms expanded view of discharge regime D1, heating period D2 and stop phase D3 in Fig. 6；
Fig. 8 be electromagnetic heating system according to an embodiment of the invention method for heating and controlling in the first pulse signal and
The control principle drawing of second pulse signal；
Fig. 9 is the block diagram of the heating control apparatus of electromagnetic heating system according to the ... of the embodiment of the present invention；
Figure 10 is the block diagram of the heating control apparatus of electromagnetic heating system according to an embodiment of the invention；
Figure 11 is the circuit diagram of electromagnetic heating system according to an embodiment of the invention；And
Figure 12 is the block diagram of electromagnetic heating system according to the ... of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Method for heating and controlling, the electricity of the electromagnetic heating system proposed according to embodiments of the present invention described with reference to the accompanying drawings
Heating control apparatus, electromagnetic heating system and the electromagnetic heating apparatus of magnetic heating system.
Fig. 4 is the flow chart of the method for heating and controlling of electromagnetic heating system according to the ... of the embodiment of the present invention.As shown in figure 4,
The method for heating and controlling includes the following steps：
S1：Obtain the target heating power W1 of electromagnetic heating system.
Wherein, target heating power W1 is electromagnetic heating system required heating power reached under different culinary art parameters.
For example, when user wants to boil milled congee, pattern of cooking congee, electromagnetic heating system can be selected on the control panel of electromagnetic heating system
Into the pattern of cooking congee, electromagnetic heating system can carry out low-power heating with the heating power of 800W under the pattern of cooking congee, right at this time
The target heating power answered is 800W.
S2：Judge whether target heating power W1 is less than predetermined power W2.
Wherein, predetermined power W2 can be the performance number demarcated according to actual conditions, when target heating power W1 is less than
When predetermined power W2, judge electromagnetic heating system for low-power heat, and target heating power W1 be more than predetermined power W2 when, sentence
Disconnected electromagnetic heating system heats for high power.
A specific embodiment according to the present invention, predetermined power W2 can be 1400W, bring to reducing frequent starting
Noise.
S3：If target heating power W1 is less than predetermined power W2, in each controlling cycle, electromagnetic heating system is controlled
Sequentially enter discharge regime, heating period and stop phase, wherein provide multiple first pulse signals to electromagnetism in discharge regime
The power switch tube of the resonance circuit of heating system is so that the electric current for flowing through power switch tube is less than pre-set current value, and is heating
Stage provides multiple second pulse signals to power switch tube, and the amplitude of the first pulse signal gradually increases from the first driving voltage V1
Add to the second driving voltage V2, the amplitude of the second pulse signal is the second driving voltage V2, and the first driving voltage V1 is less than the
Two driving voltage V2.
It should be understood that the amplitude of the first pulse signal is gradually increased to the second driving voltage from the first driving voltage V1
The overall variation trend that V2 can refer to amplitude is incremental, and the amplitude of two neighboring first pulse signal may be present during increasing
Equal situation.Also, the amplitude of multiple first pulse signals also can be incremented by successively according to same predeterminated voltage variable quantity, also may be used
It is incremented by successively according to different predeterminated voltage variable quantities.For example, the amplitude of multiple first pulse signals can first remain the first drive
Dynamic voltage V1 (amplitude of several the first pulse signals first exported is the first driving voltage V1), according still further to predeterminated voltage
Variable quantity is incremented by successively to the second driving voltage V2 from the first driving voltage V2.For another example, the amplitude of multiple first pulse signals can
It is first incremented by successively to the second driving voltage V2 from the first driving voltage V1 according to predeterminated voltage variable quantity, then remain the second driving
Voltage V2 (amplitude of several the first pulse signals finally exported is the second driving voltage V2).
Further, according to one embodiment of present invention, third driving voltage is persistently exported to power in stop phase
Switching tube is turned off with driving power switching tube.Wherein, third driving voltage can be 0V.
According to one embodiment of present invention, pre-set current value can be 85A.
It should be noted that when using the first driving voltage V1 driving powers switching tube such as IGBT pipes, power can be made
Switching tube is operated in magnifying state；When using the second driving voltage V2 driving powers switching tube such as IGBT pipes, power can be made
Switching tube is operated in saturation conduction state.As a result, when the amplitude of multiple first pulse signals rises to from the first driving voltage V1
During second driving voltage V2, the working condition of power switch tube will be become saturation conduction state from magnifying state, in work(
When rate switching tube is operated in magnifying state, from the relationship between the driving voltage and electric current of IGBT pipes shown in fig. 5 it is found that IGBT
The electric current of pipe is related to the driving voltage for being provided to IGBT pipes, for example, when the driving voltage for being provided to IGBT pipes is 9V, IGBT
The C electrode currents of pipe can be constant in 22A or so, is operated in magnifying state by driving power switching tube as a result, can limit IGBT pipes
Electric current be for example limited in 85A hereinafter, to effective suppressor pulse electric current.
A specific embodiment according to the present invention, the first driving voltage V1 can be more than or equal to 5V and be less than or equal to 14.5V,
Second driving voltage V2 is more than or equal to 15V.More specifically, power switch tube can be IGBT, the first driving voltage V1 is preferably
9V, when the first driving voltage V1 for being provided to IGBT is 9V, the C electrode currents of IGBT can be constant for 22A or so, and IGBT works
Make in magnifying state, to inhibit pulse current well.Second driving voltage V2 is preferably 15V, in the second driving electricity
Under the driving for pressing V2, IGBT is operated in saturation state.Third driving voltage V3 can be 0V, in the driving of third driving voltage V3
Under, IGBT shutdowns.
It should be noted that the pulse width of the first pulse signal is less than the pulse width of the second pulse signal.Work as use
When the first pulse signal driving power switching tube such as IGBT pipes of narrow spaces, one is needed since the pulse current of IGBT pipes rises
Therefore the fixed time can turn off IGBT pipes using narrow spaces before the pulse current of IGBT pipes rises to higher value, can also limit
The electric current of IGBT pipes processed is for example limited in 85A hereinafter, to effectively inhibit pulse current.
Specifically, when target heating power W1 is less than predetermined power W2, as shown in fig. 6-7, each controlling cycle packet
Discharge regime D1, heating period D2 and stop phase D3 are included, i.e., in each control cycle, control resonance circuit is (in such as Figure 11
C2 and L2 in parallel) sequentially enter discharge regime D1, heating period D2 and stop phase D3.More specifically, electric discharge can be introduced into
Stage D1, the driving circuit for controlling electromagnetic heating system export multiple first pulse signals to the control terminal of power switch tube, with
By the electric energy release of filter capacitor during stop phase in previous controlling cycle (i.e. C1 in Figure 11) storage so that enter and add
The collector voltage of power switch tube is essentially 0V when hot stage D2, reduces the pulse current of power switch tube.In discharge regime
Heating period D2 is entered back into after the completion of D1, in heating period D2, control driving circuit exports multiple second pulse signals to power
The control terminal of switching tube, so that power switch tube is operated in saturation conduction state, electromagnetic heating system can carry out normally at this time
Resonance heats.Also, enter stop phase D3 after the completion of heating period D2, in stop phase D3, control driving circuit output
Third driving voltage, that is, 0V, not output pulse signal, power switch tube shutdown, at this time electromagnetic heating system stopping are heated.
Also, duty ratio mode can be used and control electromagnetic heating system by progress low-power heating, i.e., in each control week
Phase, controllable electromagnetic heating system, which first heats the t1 times, to be stopped heating the t2 times again, and duty ratio is t1/ (t1+t2).Specifically
Ground, as shown in fig. 6, in one embodiment of the invention, controlling cycle can be foreshortened to a millisecond pole, such as with electric main
Half wave cycles are that duty ratio is arranged in unit, and low-power will be carried out to control electromagnetic heating system using millisecond pole duty ratio mode
It heating, duty ratio can refer to the half-wave quantity shared by the heating period and the ratio between half wave number shared by entire controlling cycle at this time, for example,
When controlling cycle is 4 half-waves, if 1 half-wave of heating, stop 3 half-waves of heating, then duty ratio is 1/4, i.e., each control
The duration of heating period D2 is about a half wave cycles in period；For another example, when controlling cycle is 4 half-waves, if plus
Hot 2 half-waves stop 2 half-waves of heating, then duty ratio is 2/4, i.e., the duration of heating period D2 in each controlling cycle
About two half wave cycles；For another example, when controlling cycle is 4 half-waves, if 3 half-waves of heating, stop 1 half-wave of heating,
Then duty ratio is 3/4, i.e., the duration of heating period D2 is about three half wave cycles in each controlling cycle.
It is as a result, to discharge the electric energy of filter capacitor storage using discharge regime by pre-arcing mode, power can be inhibited
The pulse current of switching tube, and then controlling cycle can be foreshortened to a millisecond pole so that heating effect is essentially identical to continuous low work(
Rate.
According to one embodiment of present invention, it is powered for electromagnetic heating system by AC power such as electric main, side
Method further includes：Obtain the voltage over zero of AC power；Electromagnetic heating system, which is controlled, according to voltage over zero enters discharge regime.
It should be noted that discharge regime can be entered near voltage over zero, you can before voltage over zero, voltage
Enter discharge regime after zero crossing or voltage over zero.
Further, the method for heating and controlling of electromagnetic heating system further includes：Enter discharge regime preset time after or
Person enters the heating period in voltage over zero control electromagnetic heating system, so that discharge regime is in centered on voltage over zero
In the zero passage voltage section of construction.
That is, can judge whether discharge regime is completed on the basis of the time, i.e., if the duration of discharge regime
Reach preset time, then control resonance circuit and exit discharge regime, into the heating period.Alternatively, can also voltage over zero sentence
Whether disconnected discharge regime is completed, i.e., if detecting voltage over zero, controls resonance circuit and exit discharge regime, into heating
Stage.
Wherein, voltage zero-cross section is [- 5ms, 5ms].That is, discharge regime can be at before and after voltage over zero
In 5ms.
In addition, in one embodiment of the invention, the method for heating and controlling of electromagnetic heating system further includes：It can also basis
Voltage over zero control electromagnetic heating system enters stop phase.
Specifically, in conjunction with the embodiment of Fig. 6, it is assumed that select the low-power of 2/4 duty ratio to heat according to target heating power,
So entire controlling cycle is 4 half-waves, and heating cycle is close to 2 half-waves.The method for heating and controlling of electromagnetic heating system is as follows：
Discharge regime D1 can be advanced into first zero crossing A1, such as can first estimate first zero crossing A1,
Then obtain discharge regime D1's according to the first zero crossing A1 and discharge regime D1 estimated the preset time t f that need to continue
Start time, start time control electromagnetic heating system enter discharge regime D1, that is, control driving circuit output amplitude be from
First driving voltage V1 gradually rises up to the first pulse signal of the second driving voltage V2 to power switch tube, by stop phase
The electric energy release of period filter capacitor storage.
During controlling driving circuit the first pulse signal of output, voltage over zero is detected in real time, and detecting
When voltage over zero i.e. first zero crossing A1, control electromagnetic heating system enters heating period D2, that is, it is defeated to control driving circuit
Go out amplitude be the second driving voltage V2 the second pulse signal to power switch tube control terminal so that power switch tube is operated in
Saturation conduction state, at this time electromagnetic heating system can carry out normal resonance heating.
The duration of heating period D2 exports the second pulse signal close to two half wave cycles, in control driving circuit
In the process, continue detection voltage over zero in real time, and when detecting third zero crossing A3, control electromagnetic heating system enters
Stop phase D3 controls driving circuit and persistently exports third driving voltage i.e. 0V to the control terminal of power switch tube, with driving
Power switch tube turns off, and electromagnetic heating system stops heating.
The duration of stop phase D3 can first estimate the 5th close to two half wave cycles in stop phase D3
Then zero crossing A5 is obtained next according to the 5th zero crossing A5 and discharge regime D1 estimated the preset times that need to continue
It is carved at the beginning of discharge regime D1 in controlling cycle.
So repeat the low-power heating, it can be achieved that Millisecond duty ratio so that heating effect is essentially identical to continuous low
Power.
According to one embodiment of present invention, as shown in fig. 7, the pulse width of multiple first pulse signals can gradually increase
Add.Also, the difference of the pulse width of two neighboring first pulse signal is smaller than equal to predetermined width threshold value.
It should be understood that pulse width can refer to the duration of high level, the pulse width of multiple first pulse signals
The overall trend for gradually increasing the pulse width that can refer to multiple first pulse signals is incremental, and incremental manner can be a variety of, packet
It includes but is not limited to, successively increased according to identical preset increments, either successively increase or increasing according to different preset increments
Continuous multiple pulse widths may make to remain unchanged during adding.
Specifically, as shown in Figure 7, it is assumed that in M the first pulse signals of discharge regime D1 driving circuits output to power
Switching tube, to discharge the electric energy stored in previous stop phase D3 filter capacitors, wherein the pulse of M the first pulse signals
Width can be respectively Y1, Y2 ..., YM-2, YM-1, YM.Increase trend, such as M arteries and veins is integrally presented in M the first pulse signals
Following relationship can be met by rushing between the pulse width of signal：Yi≤Yi+1≤Yi+n, wherein i=1 to M-1, Yi are i-th the
The pulse width of one pulse signal, Yi+1 are the pulse width of the first pulse signal of i+1, and n is predetermined width threshold value, i.e.,
Speech, the pulse width difference of each two adjacent first pulse signal can be equal, i.e., is gradually increased according to identical preset increments；
Or there are the difference of the pulse width of two adjacent first pulse signals it is zero, you can so that continuous multiple pulse widths are protected
It holds constant.
Also, the amplitude of M the first pulse signals can according to predeterminated voltage variable quantity △ V from the first driving voltage V1 successively
It is incremented to the second driving voltage V2, at this time V2=V1+ (M-1) × △ V, for example, pulse width is the first pulse signal pair of Y1
The amplitude answered is the first driving voltage V1, and the corresponding amplitude of the first pulse signal that pulse width is Y2 is (V1+ △ V) ... ...,
The corresponding amplitude of the first pulse signal that pulse width is YM is the second driving voltage V2.
In addition, according to one embodiment of present invention, the pulse width of multiple first pulse signals can be also gradually reduced.Arteries and veins
It rushes mode that width is gradually reduced and the aforementioned mode gradually increased is essentially identical, no longer repeat one by one.Alternatively, multiple first arteries and veins
Rush the pulse width of signal also can all same, i.e.,：YM=YM-1=YM-2 ... ,=Y2=Y1.
Wherein, according to one embodiment of present invention, the value range of predetermined width threshold value can be 1us-5us, preferably may be used
For 2us.
According to one embodiment of present invention, the pulse width of each first pulse signal is all higher than equal to 0.1us and small
In equal to 15us, i.e. Y1, Y2 ..., YM-2, YM-1, YM be all higher than equal to 0.1us and be less than or equal to 15us.First the first arteries and veins
The pulse width i.e. Y1 for rushing signal can be more than or equal to 0.1us and be less than or equal to 2us.
It should be noted that the pulse that the pulse width of any one the first pulse signal is less than each second pulse signal is wide
Degree.In other words, the pulse width for multiple first pulse signals that discharge regime provides is respectively less than multiple the of heating period offer
Minimum pulse width in the pulse width of two pulse signals.Specifically, it is assumed that the pulse width of multiple second pulse signals is equal
For Yn, then, YM, YM-1, YM-2 ..., Y2, Y1 be respectively less than Yn.
In addition, according to one embodiment of present invention, when target heating power W1 is greater than or equal to predetermined power W2, can adopt
With the second single driving voltage V2 driving power switching tubes, electromagnetic heating system can carry out continuous high power heating at this time.
It should be noted that as shown in Figure 8 and Figure 11, the exportable drive pulse signal of driving circuit of electromagnetic heating system
To power switch tube with driving power switching tube.The control unit of electromagnetic heating system has the first control output end and the second control
Output end processed, control unit can be exported first control signal such as PPG signals by the first control output end and by the second controls
Output end processed exports second control signal such as EN signals to driving circuit, and driving circuit can generate driving arteries and veins according to PPG signals
It rushes signal and adjusts the amplitude of drive pulse signal according to EN signals.For example, driving circuit may include voltage changing module and driving mould
Block, drive module can generate drive pulse signal according to PPG signals, what voltage changing module can export drive module according to EN signals
Drive pulse signal carries out multi-stage pressure regulating, so that the amplitude of drive pulse signal has multiple voltage class.It as a result, can be according to reality
Border Demand Design voltage changing module, to be set in the section more than or equal to the first driving voltage V1 and less than or equal to the second driving voltage V2
Multiple driving voltages are set, the amplitude to control the first pulse signal by EN signals changes between multiple driving voltages, example
Such as the second driving voltage V2 is gradually increased to from the first driving voltage V1 according to multiple driving voltages.
Wherein, voltage changing module may include capacitance or multiple pressure units being made of voltage-stabiliser tube, when voltage changing module includes
The amplitude that drive pulse signal can be controlled when capacitance by controlling the charging time of capacitance, when voltage changing module includes multiple by voltage stabilizing
The amplitude of drive pulse signal can be controlled when the pressure unit that pipe is constituted by the voltage stabilizing value of voltage-stabiliser tube.
In conclusion the method for heating and controlling of the electromagnetic heating system proposed according to embodiments of the present invention, obtains electricity first
The target heating power of magnetic heating system, then judges whether target heating power is less than predetermined power, if target heats work(
Rate is less than predetermined power, then in each controlling cycle, the resonance circuit for controlling electromagnetic heating system sequentially enters discharge regime, adds
Hot stage and stop phase, wherein provide multiple first pulse signals to the resonance circuit of electromagnetic heating system in discharge regime
Power switch tube so that the electric current for flowing through power switch tube is less than pre-set current value, and provides multiple second arteries and veins in the heating period
Signal is rushed to power switch tube, the amplitude of the first pulse signal is gradually increased to the second driving voltage from the first driving voltage V1
The amplitude of V2, the second pulse signal are the second driving voltage V2, and the first driving voltage V1 is less than the second driving voltage V2, to
It can inhibit the pulse current of power switch tube, and can realize low-power heating by the duty ratio mode of heating of millisecond pole, carry
High user experience.
Fig. 9 is the block diagram of the heating control apparatus of electromagnetic heating system according to the ... of the embodiment of the present invention.Such as Fig. 9 institutes
Show, the heating control apparatus of electromagnetic heating system, including：Driving circuit 10, resonance circuit 20 and control unit 30.
Wherein, resonance circuit 20 includes power switch tube drives 40, and as shown in figure 11, rate switching tube driving 40 can be IGBT
Pipe, resonance circuit 20 further includes resonant capacitance C2 and heating coil L2, and resonant capacitance C2 and heating coil L2 can be connected in parallel, and
One end of the resonant capacitance C2 and heating coil L2 of connection are connected with filter inductance L1, are also connected with one end of filter capacitor C1, filter
The other end of wave capacitance C1 is grounded, and the other end of resonant capacitance C2 in parallel and heating coil L2 are extremely connected with the C of IGBT pipes,
The poles E of IGBT pipes are grounded.
Driving circuit 10 is extremely connected with the G of the control terminal of power switch tube 40 such as IGBT, and driving circuit 10 is for driving
Power switch tube 40；Control unit 30 is connected with driving circuit 10, and control unit 30 is used to obtain the target of electromagnetic heating system
Heating power, and judge whether target heating power is less than predetermined power, and when target heating power is less than predetermined power,
Discharge regime, heating period and stop phase are sequentially entered in each controlling cycle control electromagnetic heating system, wherein are being discharged
Stage control driving circuit 10 provides multiple first pulse signals to power switch tube 40 so as to flow through the electricity of power switch tube 40
Stream is less than pre-set current value, and provides multiple second pulse signals to power switch tube in heating period control driving circuit 10
40, the amplitude of the first pulse signal is gradually increased to the second driving voltage V2 from the first driving voltage V1, the second pulse signal
Amplitude is the second driving voltage V2, and the first driving voltage V1 is less than the second driving voltage V2.
It should be understood that the amplitude of the first pulse signal is gradually increased to the second driving voltage from the first driving voltage V1
The overall variation trend that V2 can refer to amplitude is incremental, and the amplitude of two neighboring first pulse signal may be present during increasing
Equal situation.Also, the amplitude of multiple first pulse signals also can be incremented by successively according to same predeterminated voltage variable quantity, also may be used
It is incremented by successively according to different predeterminated voltage variable quantities.For example, the amplitude of multiple first pulse signals can first remain the first drive
Dynamic voltage V1 (amplitude of several the first pulse signals first exported is the first driving voltage V1), according still further to predeterminated voltage
Variable quantity is incremented by successively to the second driving voltage V2 from the first driving voltage V2.For another example, the amplitude of multiple first pulse signals can
It is first incremented by successively to the second driving voltage V2 from the first driving voltage V1 according to predeterminated voltage variable quantity, then remain the second driving
Voltage V2 (amplitude of several the first pulse signals finally exported is the second driving voltage V2).
Further, according to one embodiment of present invention, control unit 30 is additionally operable to persistently export in stop phase
Three driving voltages are turned off to power switch tube 40 with driving power switching tube 40.Wherein, third driving voltage can be 0V.
Wherein, target heating power W1 is electromagnetic heating system required heating power reached under different culinary art parameters.
For example, when user wants to boil milled congee, pattern of cooking congee, electromagnetic heating system can be selected on the control panel of electromagnetic heating system
Into the pattern of cooking congee, electromagnetic heating system can carry out low-power heating with the heating power of 800W under the pattern of cooking congee, right at this time
The target heating power answered is 800W.
Wherein, predetermined power W2 can be the performance number demarcated according to actual conditions, when target heating power W1 is less than
When predetermined power W2, judge electromagnetic heating system for low-power heat, and target heating power W1 be more than predetermined power W2 when, sentence
Disconnected electromagnetic heating system heats for high power.
A specific embodiment according to the present invention, predetermined power W2 can be 1400W, bring to reducing frequent starting
Noise.
According to one embodiment of present invention, pre-set current value can be 85A.
It should be noted that when using the first driving voltage V1 driving powers 40 such as IGBT pipes of switching tube, work(can be made
Rate switching tube 40 is operated in magnifying state；When using the second driving voltage V2 driving powers switching tube such as IGBT pipes, it can make
Power switch tube 40 is operated in saturation conduction state.As a result, when the amplitude of multiple first pulse signals is from the first driving voltage V1
During rising to the second driving voltage V2, the working condition of power switch tube will be become saturation conduction shape from magnifying state
State, when power switch tube 40 is operated in magnifying state, the relationship between the driving voltage and electric current of IGBT pipes shown in fig. 5
It is found that the electric current of IGBT pipes is related to the driving voltage for being provided to IGBT pipes, for example, when the driving voltage for being provided to IGBT pipes is
When 9V, the C electrode currents of IGBT pipes can be constant in 22A or so, and control unit 30 can be by adjusting being provided to the drive of IGBT pipes as a result,
Dynamic voltage can limit the electric current of IGBT pipes, such as be limited in 85A hereinafter, to effective suppressor pulse electric current.
A specific embodiment according to the present invention, the first driving voltage V1 can be more than or equal to 5V and be less than or equal to 14.5V,
Second driving voltage V2 is more than or equal to 15V.More specifically, power switch tube can be IGBT, the first driving voltage V1 is preferably
9V, when the first driving voltage V1 for being provided to IGBT is 9V, the C electrode currents of IGBT can be constant for 22A or so, and IGBT works
Make in magnifying state, to inhibit pulse current well.Second driving voltage V2 is preferably 15V, in the second driving electricity
Under the driving for pressing V2, IGBT is operated in saturation state.Third driving voltage V3 can be 0V, in the driving of third driving voltage V3
Under, IGBT shutdowns.
It should be noted that the pulse width of the first pulse signal is less than the pulse width of the second pulse signal.Work as use
When the first pulse signal driving power switching tube such as IGBT pipes of narrow spaces, one is needed since the pulse current of IGBT pipes rises
Therefore the fixed time can turn off IGBT pipes using narrow spaces before the pulse current of IGBT pipes rises to higher value, can also limit
The electric current of IGBT pipes processed is for example limited in 85A hereinafter, to effectively inhibit pulse current.
Specifically, when target heating power W1 is less than predetermined power W2, as shown in fig. 6-7, each controlling cycle packet
Discharge regime D1, heating period D2 and stop phase D3 are included, i.e., in each control cycle, control unit 30 controls resonance circuit
(C2 and L2 in parallel in such as Figure 11) sequentially enters discharge regime D1, heating period D2 and stop phase D3.More specifically, can be first
Into discharge regime D1, control unit 30 controls driving circuit 10 and exports control of multiple first pulse signals to power switch tube 40
The electric energy of filter capacitor during stop phase in previous controlling cycle (i.e. C1 in Figure 11) storage is discharged, is made by end processed
The collector voltage for obtaining 40 pipe of power switch when entering heating period D2 is essentially 0V, reduces the pulse electricity of power switch tube 40
Stream.Heating period D2 is entered back into after the completion of discharge regime D1, in heating period D2, it is defeated that control unit 30 controls driving circuit 10
Go out multiple second pulse signals to the control terminal of power switch tube 40, so that power switch tube 40 is operated in saturation conduction state,
Electromagnetic heating system can carry out normal resonance heating at this time.Also, enter stop phase D3 after the completion of heating period D2,
Stop phase D3, control unit 30 control driving circuit 10 and export third driving voltage, that is, 0V, and output pulse signal, power are not opened
It closes pipe 40 to turn off, electromagnetic heating system stops heating at this time.
Also, duty ratio mode can be used and control electromagnetic heating system by progress low-power heating, i.e., in each control week
Phase, controllable electromagnetic heating system, which first heats the t1 times, to be stopped heating the t2 times again, and duty ratio is t1/ (t1+t2).Specifically
Ground, as shown in fig. 6, in one embodiment of the invention, controlling cycle can be foreshortened to a millisecond pole, such as with electric main
Half wave cycles are that duty ratio is arranged in unit, and low-power will be carried out to control electromagnetic heating system using millisecond pole duty ratio mode
It heating, duty ratio can refer to the half-wave quantity shared by the heating period and the ratio between half wave number shared by entire controlling cycle at this time, for example,
When controlling cycle is 4 half-waves, if 1 half-wave of heating, stop 3 half-waves of heating, then duty ratio is 1/4, i.e., each control
The duration of heating period D2 is about a half wave cycles in period；For another example, when controlling cycle is 4 half-waves, if plus
Hot 2 half-waves stop 2 half-waves of heating, then duty ratio is 2/4, i.e., the duration of heating period D2 in each controlling cycle
About two half wave cycles；For another example, when controlling cycle is 4 half-waves, if 3 half-waves of heating, stop 1 half-wave of heating,
Then duty ratio is 3/4, i.e., the duration of heating period D2 is about three half wave cycles in each controlling cycle.
It is as a result, to discharge the electric energy of filter capacitor storage using discharge regime by pre-arcing mode, power can be inhibited
The pulse current of switching tube, and then controlling cycle can be foreshortened to a millisecond pole so that heating effect is essentially identical to continuous low work(
Rate.
According to one embodiment of present invention, it can be powered for electromagnetic heating system by AC power, as shown in Figure 10, dress
It sets and further includes：Zero passage detection unit 50, zero passage detection unit 50 are connected with control unit 30, and zero passage detection unit 50 is for obtaining
The voltage over zero of AC power, control unit 30, which is used to control electromagnetic heating system according to voltage over zero, enters electric discharge rank
Section.
It should be noted that control unit 30 can control resonance circuit 20 to enter discharge regime near voltage over zero,
Can before voltage over zero, after voltage over zero or voltage over zero enter discharge regime.
According to one embodiment of present invention, control unit 30 be additionally operable to enter discharge regime preset time after or
Voltage over zero control electromagnetic heating system enters the heating period, is constructed centered on voltage over zero so that discharge regime is in
Zero passage voltage section in
That is, can judge whether discharge regime is completed on the basis of the time, i.e., if the duration of discharge regime
Reach preset time, control unit 30 then controls resonance circuit and exits discharge regime, into the heating period.Alternatively, can also electricity
It presses through zero and judges whether discharge regime is completed, i.e., if detecting voltage over zero, control unit 30 ifs controls resonance circuit
Discharge regime is exited, into the heating period.
Wherein, voltage zero-cross section is [- 5ms, 5ms].That is, discharge regime can be at before and after voltage over zero
In 5ms.
In addition, in one embodiment of the invention, control unit 30 can also control electromagnetic heating according to voltage over zero
System enters stop phase.
Specifically, in conjunction with the embodiment of Fig. 6, it is assumed that select the low-power of 2/4 duty ratio to heat according to target heating power,
So entire controlling cycle is 4 half-waves, and heating cycle is close to 2 half-waves.Control unit 30 can be carried out as follows heating
Control：
Control unit 30 can control electromagnetic heating system before first zero crossing A1 and enter discharge regime D1, such as can
First to estimate first zero crossing A1, then need to be continued according to the first zero crossing A1 and discharge regime D1 estimated pre-
If time tf carves at the beginning of obtaining discharge regime D1, controls electromagnetic heating system in start time control unit 30 and enter electric discharge
Stage D1, that is, it is that the second driving voltage V2 is gradually risen up to from the first driving voltage V1 to control 10 output amplitude of driving circuit
To power switch tube, the electric energy that filter capacitor during stop phase is stored discharges one pulse signal.
Control unit 30 passes through zero passage detection unit 50 during controlling the first pulse signal of output of driving circuit 10
Detection voltage over zero in real time, and when detecting voltage over zero i.e. first zero crossing A1, control electromagnetic heating system into
Enter heating period D2, i.e. control unit 30 controls the second pulse signal that 10 output amplitude of driving circuit is the second driving voltage V2
To the control terminal of power switch tube 40, so that power switch tube 40 is operated in saturation conduction state, electromagnetic heating system can at this time
Carry out normal resonance heating.
The duration of heating period D2, control unit 30 was in control driving circuit 10 output the close to two half wave cycles
During two pulse signals, continue, voltage over zero is detected by zero passage detection unit 50 in real time, and detecting third
When zero crossing A3, control electromagnetic heating system enters stop phase D3, i.e. control unit 30 controls driving circuit 10 and persistently exports
Third driving voltage, that is, 0V is turned off to the control terminal of power switch tube 40 with driving power switching tube 40, and electromagnetic heating system stops
Only heat.
The duration of stop phase D3, in stop phase D3, control unit 30 can first be estimated close to two half wave cycles
The 5th zero crossing A5 is calculated, the preset time that then need to continue according to the 5th zero crossing A5 and discharge regime D1 estimated
It obtains in next controlling cycle and is carved at the beginning of discharge regime D1.
So repeat the low-power heating, it can be achieved that Millisecond duty ratio so that heating effect is essentially identical to continuous low
Power.
According to one embodiment of present invention, as shown in fig. 7, the pulse width of multiple first pulse signals gradually increases.
Also, the difference of the pulse width of two neighboring first pulse signal is smaller than equal to predetermined width threshold value.
It should be understood that pulse width can refer to the duration of high level, the pulse width of multiple first pulse signals
The overall trend for gradually increasing the pulse width that can refer to multiple first pulse signals is incremental, and incremental manner can be a variety of, packet
It includes but is not limited to, successively increased according to identical preset increments, either successively increase or increasing according to different preset increments
Continuous multiple pulse widths may make to remain unchanged during adding.
Specifically, as shown in Figure 7, it is assumed that in M the first pulse signals of discharge regime D1 driving circuits output to power
Switching tube, to discharge the electric energy stored in previous stop phase D3 filter capacitors, wherein
The pulse width of M the first pulse signals can be respectively Y1, Y2 ..., YM-2, YM-1, YM.M the first pulses
Signal, which is integrally presented, can meet following relationship between increase trend, such as the pulse width of M pulse signal：Yi≤Yi+1≤Yi
+ n, wherein i=1 to M-1, Yi are the pulse width of i-th of first pulse signals, and Yi+1 is the first pulse signal of i+1
Pulse width, n are predetermined width threshold value, and in other words, the pulse width difference of each two adjacent first pulse signal can be equal, i.e.,
It is gradually increased according to identical preset increments；Or there are the difference of the pulse width of two adjacent first pulse signals be zero,
Continuous multiple pulse widths may make to remain unchanged.
Also, the amplitude of M the first pulse signals can according to predeterminated voltage variable quantity △ V from the first driving voltage V1 successively
It is incremented to the second driving voltage V2, at this time V2=V1+ (M-1) × △ V, for example, pulse width is the first pulse signal pair of Y1
The amplitude answered is the first driving voltage V1, and the corresponding amplitude of the first pulse signal that pulse width is Y2 is (V1+ △ V) ... ...,
The corresponding amplitude of the first pulse signal that pulse width is YM is the second driving voltage V2.
In addition, according to one embodiment of present invention, the pulse width of multiple first pulse signals can be also gradually reduced.Arteries and veins
It rushes mode that width is gradually reduced and the aforementioned mode gradually increased is essentially identical, no longer repeat one by one.Alternatively, multiple first arteries and veins
Rush the pulse width of signal also can all same, i.e.,：YM=YM-1=YM-2 ... ,=Y2=Y1.
Wherein, according to one embodiment of present invention, wherein the value range of predetermined width threshold value can be 1us-5us, excellent
Choosing can be 2us.
According to one embodiment of present invention, the pulse width of each first pulse signal is all higher than equal to 0.1us and small
In equal to 15us, i.e. Y1, Y2 ..., YM-2, YM-1, YM be all higher than equal to 0.1us and be less than or equal to 15us.First the first arteries and veins
The pulse width i.e. Y1 for rushing signal can be more than or equal to 0.1us and be less than or equal to 2us.
It should be noted that the pulse that the pulse width of any one the first pulse signal is less than each second pulse signal is wide
Degree.In other words, the pulse width for multiple first pulse signals that discharge regime provides is respectively less than multiple the of heating period offer
Minimum pulse width in the pulse width of two pulse signals.Specifically, it is assumed that the pulse width of multiple second pulse signals is equal
For Yn, then, YM, YM-1, YM-2 ..., Y2, Y1 be respectively less than Yn.
In addition, according to one embodiment of present invention, when target heating power W1 is greater than or equal to predetermined power W2, control
The second single driving voltage V2 driving powers switching tube 40 can be used in unit 30, and electromagnetic heating system can carry out continuous height at this time
Power heats.
It should be noted that as shown in Figure 8 and Figure 11, the 10 exportable driving pulse of driving circuit of electromagnetic heating system is believed
Number to power switch tube 40 with driving power switching tube 40.The control unit 30 of electromagnetic heating system has the first control output end
PPG and the second control output end EN, control unit 30 can export first control signal for example by the first control output end PPG
PPG signals simultaneously export second control signal such as EN signals to driving circuit 10, driving circuit by the second control output end EN
10 can generate drive pulse signal according to PPG signals and adjust the amplitude of drive pulse signal according to EN signals.For example, driving electricity
Road 10 may include that voltage changing module 12 and drive module 11, drive module 11 can generate drive pulse signal, transformation according to PPG signals
Module 12 can carry out multi-stage pressure regulating according to EN signals to the drive pulse signal that drive module 11 exports, so that drive pulse signal
Amplitude have multiple voltage class.Voltage changing module 12 can be designed according to actual demand as a result, with more than or equal to the first driving
Voltage V1 and the multiple driving voltages of section setting for being less than or equal to the second driving voltage V2, the first arteries and veins is controlled to pass through EN signals
The amplitude for rushing signal changes between multiple driving voltages, such as is gradually increased from the first driving voltage V1 according to multiple driving voltages
Add to the second driving voltage V2.
Wherein, voltage changing module 12 may include capacitance or multiple pressure units being made of voltage-stabiliser tube, when voltage changing module 12
The amplitude that drive pulse signal can be controlled when including capacitance by controlling the charging time of capacitance, when voltage changing module 12 includes multiple
The amplitude of drive pulse signal can be controlled when the pressure unit being made of voltage-stabiliser tube by the voltage stabilizing value of voltage-stabiliser tube.
In conclusion the heating control apparatus of the electromagnetic heating system proposed according to embodiments of the present invention, when target heats
When power is less than predetermined power, sequentially entered in the resonance circuit of each controlling cycle, control unit control electromagnetic heating system
Discharge regime, heating period and stop phase, wherein if target heating power is less than predetermined power, in each control week
Phase, the resonance circuit for controlling electromagnetic heating system sequentially enter discharge regime, heating period and stop phase, wherein are discharging
Stage provides the power switch tube of resonance circuit of multiple first pulse signals to electromagnetic heating system so as to flow through power switch
The electric current of pipe is less than pre-set current value, and provides multiple second pulse signals to power switch tube, the first pulse in the heating period
The amplitude of signal is gradually increased to the second driving voltage V2 from the first driving voltage V1, and the amplitude of the second pulse signal is the second drive
Dynamic voltage V2, and the first driving voltage V1 is less than the second driving voltage V2.As a result, by pre-arcing mode, power can be inhibited
The pulse current of switching tube, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heating system.
Figure 12 is the block diagram of electromagnetic heating system according to the ... of the embodiment of the present invention.As shown in figure 12, electromagnetic heating
System 60 includes：The heating control apparatus 70 of the electromagnetic heating system of above-described embodiment.
According to one embodiment of present invention, electromagnetic heating system 60 is suitable for electromagnetic oven, electromagnetic rice cooker or electromagnetism pressure
Power pot etc..
The electromagnetic heating system proposed according to embodiments of the present invention can inhibit power switch tube by pre-arcing mode
Pulse current, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
Finally, the embodiment of the present invention also proposed a kind of electromagnetic heating apparatus, include the electromagnetic heating system of above-described embodiment
System.
According to one embodiment of present invention, the electromagnetic heating apparatus is electromagnetic oven, electromagnetic stove, electromagnetic rice cooker or electricity
Magnetic pressure pot.
The electromagnetic heating apparatus proposed according to embodiments of the present invention can inhibit power switch tube by pre-arcing mode
Pulse current, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is 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. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (23)
1. a kind of method for heating and controlling of electromagnetic heating system, which is characterized in that include the following steps：
Obtain the target heating power of the electromagnetic heating system；
Judge whether the target heating power is less than predetermined power；
If the target heating power controls the electromagnetic heating system less than the predetermined power in each controlling cycle
System sequentially enters discharge regime, heating period and stop phase, wherein provides multiple first pulse signals in the discharge regime
Extremely the power switch tube of the resonance circuit of the electromagnetic heating system is so as to flow through the electric current of the power switch tube less than default
Current value, and multiple second pulse signals are provided to the power switch tube, first pulse signal in the heating period
Amplitude be gradually increased to the second driving voltage from the first driving voltage, the amplitude of second pulse signal is described second to drive
Dynamic voltage, and first driving voltage is less than second driving voltage.
2. the method for heating and controlling of electromagnetic heating system according to claim 1, which is characterized in that wherein, stop described
Only the stage persistently exports third driving voltage to the power switch tube, to drive the power switch tube to turn off.
3. the method for heating and controlling of electromagnetic heating system according to claim 1, which is characterized in that the multiple first arteries and veins
The pulse width for rushing signal gradually increases.
4. the method for heating and controlling of electromagnetic heating system according to claim 3, which is characterized in that wherein, each first
The pulse width of pulse signal is all higher than equal to 0.1us and is less than or equal to 15us.
5. the method for heating and controlling of electromagnetic heating system according to claim 3, which is characterized in that wherein, first
The pulse width of one pulse signal is more than or equal to 0.1us and is less than or equal to 2us.
6. the method for heating and controlling of electromagnetic heating system according to claim 3, which is characterized in that be by AC power
The electromagnetic heating system power supply, the method further include：
Obtain the voltage over zero of the AC power；
The electromagnetic heating system, which is controlled, according to the voltage over zero enters the discharge regime.
7. the method for heating and controlling of electromagnetic heating system according to claim 6, which is characterized in that further include：Entering
It after the discharge regime preset time or controls the resonance circuit in the voltage over zero and enters the heating period, with
The discharge regime is set to be in the zero passage voltage section constructed centered on the voltage over zero.
8. the method for heating and controlling of electromagnetic heating system according to claim 7, which is characterized in that wherein, the voltage
Zero passage section is [- 5ms, 5ms].
9. the method for heating and controlling of electromagnetic heating system according to claim 1, which is characterized in that the first driving electricity
Pressure is more than or equal to 5V and is less than or equal to 14.5V, and second driving voltage is more than or equal to 15V.
10. the method for heating and controlling of electromagnetic heating system according to claim 1, which is characterized in that the predetermined current
Value is 85A.
11. a kind of heating control apparatus of electromagnetic heating system, which is characterized in that including：
Resonance circuit, the resonance circuit include power switch tube；
Driving circuit, the driving circuit are connected with the control terminal of the power switch tube, and the driving circuit is for driving institute
State power switch tube；
Control unit, described control unit are connected with the driving circuit, and described control unit is for obtaining the electromagnetic heating
The target heating power of system, and judge whether the target heating power is less than predetermined power, and heated in the target
When power is less than the predetermined power, each controlling cycle control the electromagnetic heating system sequentially enter discharge regime plus
Hot stage and stop phase, wherein control the driving circuit in the discharge regime and provide multiple first pulse signals to institute
Power switch tube is stated so that the electric current for flowing through the power switch tube is less than pre-set current value, and controls institute in the heating period
It states driving circuit and provides multiple second pulse signals to the power switch tube, the amplitude of first pulse signal is from first
Driving voltage is gradually increased to the second driving voltage, and the amplitude of second pulse signal is second driving voltage, and institute
It states the first driving voltage and is less than second driving voltage.
12. the heating control apparatus of electromagnetic heating system according to claim 11, which is characterized in that described control unit
It is additionally operable to persistently export third driving voltage to the power switch tube, to drive the power switch tube in the stop phase
Shutdown.
13. the heating control apparatus of electromagnetic heating system according to claim 11, which is characterized in that the multiple first
The pulse width of pulse signal gradually increases.
14. the heating control apparatus of electromagnetic heating system according to claim 13, which is characterized in that wherein, Mei Ge
The pulse width of one pulse signal is all higher than equal to 0.1us and is less than or equal to 15us.
15. the heating control apparatus of electromagnetic heating system according to claim 13, which is characterized in that wherein, first
The pulse width of first pulse signal is more than or equal to 0.1us and is less than or equal to 2us.
16. the heating control apparatus of electromagnetic heating system according to claim 13, which is characterized in that pass through AC power
It powers for the electromagnetic heating system, described device further includes：
Zero passage detection unit, the zero passage detection unit are connected with described control unit, and the zero passage detection unit is for obtaining
The voltage over zero of the AC power, described control unit are used to control the electromagnetic heating system according to the voltage over zero
System enters the discharge regime.
17. the heating control apparatus of electromagnetic heating system according to claim 16, which is characterized in that described control unit
It is additionally operable to after entering the discharge regime preset time or enters institute in the voltage over zero control resonance circuit
The heating period is stated, so that the discharge regime is in the zero passage voltage section constructed centered on the voltage over zero.
18. the heating control apparatus of electromagnetic heating system according to claim 17, which is characterized in that wherein, the electricity
It is [- 5ms, 5ms] to press through zero section.
19. the heating control apparatus of electromagnetic heating system according to claim 11, which is characterized in that first driving
Voltage is more than or equal to 5V and is less than or equal to 14.5V, and second driving voltage is more than or equal to 15V.
20. the method for heating and controlling of electromagnetic heating system according to claim 11, which is characterized in that the predetermined current
Value is 85A.
21. a kind of electromagnetic heating system, which is characterized in that include that electromagnetism according to any one of claim 11-20 adds
The heating control apparatus of hot systems.
22. a kind of electromagnetic heating apparatus, which is characterized in that including electromagnetic heating system according to claim 21.
23. electromagnetic heating apparatus according to claim 22, which is characterized in that the electromagnetic heating apparatus be electromagnetic oven,
Electromagnetic stove, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
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