CN108419323A

CN108419323A - Electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device

Info

Publication number: CN108419323A
Application number: CN201710074412.3A
Authority: CN
Inventors: 江德勇; 王云峰; 雷俊; 张帆; 黄庶锋; 曾露添; 刘文华; 韩平英; 杜放
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2017-02-10
Filing date: 2017-02-10
Publication date: 2018-08-17
Anticipated expiration: 2037-02-10
Also published as: CN108419323B

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 switches between the first driving voltage and the second driving voltage and the amplitude of first the first pulse signal is the first driving voltage, the amplitude of second pulse signal remains the second driving voltage, and first driving voltage be less than the second driving voltage.Thus, it is possible to inhibit the pulse current of power switch tube, the low-power heating of millisecond pole duty ratio is realized.

Description

Electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device

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.The third of the present 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 power switch tube is less than in advance If current value, and multiple second pulse signals are provided to the power switch tube, the first pulse letter in the heating period Number amplitude switch between the first driving voltage and second driving voltage and the amplitude of first the first pulse signal is The amplitude of first driving voltage, second pulse signal remains 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 the power that resonance circuit of multiple first pulse signals to electromagnetic heating system is provided in discharge regime is opened It closes and manages so that the electric current for flowing through power switch tube is less than pre-set current value, and provides multiple second pulse signals extremely in the heating period The amplitude of power switch tube, the first pulse signal switches and first first between the first driving voltage and the second driving voltage The amplitude of pulse signal is the first driving voltage, and the amplitude of the second pulse signal remains 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, Jin Ershi can be inhibited The low-power heating of existing millisecond pole duty ratio, improves 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, and adjacent The difference of the pulse width of two the first pulse signals is less than or equal to predetermined width threshold value；Alternatively, multiple amplitudes are the first driving The pulse width of first pulse signal of voltage gradually increases or reduces, and first that at least one amplitude is the second driving voltage The pulse width of pulse signal is fixed as the second predetermined threshold value；Alternatively, the first pulse that multiple amplitudes are the second driving voltage is believed Number pulse width gradually increase or reduce, and at least one amplitude be the first driving voltage the first pulse signal pulse it is wide Degree is fixed as the first predetermined threshold value；Alternatively, at least one amplitude is the pulse width of the first pulse signal of the first driving voltage It is fixed as first predetermined threshold value, at least one amplitude is that the pulse width of the first pulse signal of the second driving voltage is fixed For second predetermined threshold value.

Wherein, the value range of the predetermined width threshold value is 1us-5us, the pulse width of first the first pulse signal 0.1us can be more than or equal to and be less than or equal to 10us.

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 drives the work(to the power switch tube for exporting the first driving voltage Rate switching tube is operated in magnifying state, or the second driving voltage of output drives the power switch to the power switch tube Pipe is operated in saturation state, or output third driving voltage drives the power switch tube to close to the power switch tube It is disconnected；Control unit, described control unit are connected with the driving circuit, and described control unit is for obtaining the electromagnetic heating system The target heating power of system, and judge whether the target heating power is less than predetermined power, and heat work(in the target When rate is less than the predetermined power, controls the electromagnetic heating system in each controlling cycle and sequentially enter discharge regime, heating Stage and stop phase, wherein control the driving circuit in the discharge regime and provide multiple first pulse signals to described Power switch tube so that flow through the power switch tube electric current be less than pre-set current value, and the heating period control described in Driving circuit provides multiple second pulse signals to the power switch tube, and the amplitude of first pulse signal is in the first driving The amplitude of switching and first the first pulse signal is first driving voltage, institute between voltage and second driving voltage The amplitude for stating the second pulse signal remains second driving voltage, and first driving voltage is less than described second and drives Voltage.

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 switches and between the first driving voltage and the second driving voltage The amplitude of one the first pulse signal is the first driving voltage, and the amplitude of the second pulse signal remains the second driving voltage, and First driving voltage is less than the second driving voltage.As a result, by pre-arcing mode, the pulse electricity of power switch tube can be inhibited Stream, and then realize the low-power heating of millisecond pole duty ratio, improve user experience.

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 or reduces, And the difference of the pulse width of two neighboring first pulse signal is less than or equal to predetermined width threshold value；Alternatively, multiple amplitudes are the The pulse width of first pulse signal of one driving voltage gradually increases or reduces, and at least one amplitude is the second driving voltage The pulse width of the first pulse signal be fixed as the second predetermined threshold value；Alternatively, multiple amplitudes are the first of the second driving voltage The pulse width of pulse signal gradually increases or reduces, and the first pulse signal that at least one amplitude is the first driving voltage Pulse width is fixed as the first predetermined threshold value；Alternatively, at least one amplitude is the arteries and veins of the first pulse signal of the first driving voltage It rushes width and is fixed as first predetermined threshold value, at least one amplitude is that the pulse of the first pulse signal of the second driving voltage is wide Degree is fixed as second predetermined threshold value.

Wherein, the value range of the predetermined width threshold value is 1us-5us.The pulse of first first pulse signal Width is more than or equal to 0.1us and is less than or equal to 10us.

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].

In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of electromagnetic heating system, including described The control device 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 can be electromagnetic oven, electromagnetic stove, electromagnetic rice cooker or Prevention electromagnetic pressure cooker.

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 The heating control apparatus and electromagnetic heating system 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 is in the first driving voltage V1 and second The amplitude of switching and first the first pulse signal is the first driving voltage V1, the width of the second pulse signal between driving voltage V2 Value remains the second driving voltage V2, and the first driving voltage V1 is less than 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.Wherein, it when power switch tube is operated in magnifying state, is managed from IGBT shown in fig. 5 Driving voltage and electric current between relationship it is found that the electricity of IGBT pipes can be limited by adjusting the driving voltage for being provided to IGBT pipes Stream samples the first driving voltage V1 driving IGBT pipes as a result, can by the current limit of IGBT pipes in 85A hereinafter, to effectively press down Pulse current processed.

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 when using the pulse signal driving power switching tube such as IGBT pipes of narrow spaces, due to The pulse current rising of IGBT pipes needs the regular hour, therefore, can be risen in the pulse current of IGBT pipes using narrow spaces IGBT pipes are turned off before to higher value, to effectively inhibit pulse current.According to a preferred embodiment of the present invention, amplitude is The pulse width of the first pulse signal of second driving voltage V2 is smaller than equal to 1us.

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 rank can be entered Section D1, the driving circuit for controlling electromagnetic heating system first export pulse signal that an amplitude is the first driving voltage V1 to power The control terminal of switching tube, then the first pulse that output amplitude switches between the first driving voltage V1 and the second driving voltage V2 are believed Number to power switch tube control terminal, by filter capacitor during stop phase in previous controlling cycle (i.e. C1 in Figure 11) The electric energy of storage discharges so that the collector voltage into power switch tube when heating period D2 is essentially 0V, reduces power and opens Close the pulse current of pipe.Heating period D2 is entered back into after the completion of discharge regime D1, in heating period D2, control driving circuit is defeated Go out multiple amplitudes be the second driving voltage V2 the second pulse signal to power switch tube control terminal so that power switch plumber Work can carry out normal resonance heating in saturation conduction state, at this time electromagnetic heating system.Also, after the completion of heating period D2 Into stop phase D3, in stop phase D3, control driving circuit exports third driving voltage, that is, 0V, not output pulse signal, Power switch tube turns off, and 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 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 enters discharge regime D1 in start time control electromagnetic heating system, that is, controlling driving circuit elder generation output amplitude is The first pulse signal of first driving voltage V1 to power switch tube, then output amplitude drives in the first driving voltage V1 and second The first pulse signal switched between voltage V2 releases the electric energy that filter capacitor during stop phase stores to power switch tube It puts.

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.

It is so repeated in each controlling cycle, to realize the low-power heating of Millisecond duty ratio so that heating effect Fruit is essentially identical to continuous low power.

The amplitude of a specific embodiment according to the present invention, the first pulse signal can be switched over according to default rule, The rule switching of including but not limited to V1 → V2 → V1 and the rule of V1 → V2 → V1 → V2 switch, wherein with V1 → V2 → V1 Rule switching be first to export amplitude and be the first pulse signal of the first driving voltage V1, then export one or more Amplitude is the first pulse signal of the second driving voltage V2, finally exports the first pulse that an amplitude is the first driving voltage V1 Signal；It is first to export the first pulse that an amplitude is the first driving voltage V1 with the rule switching of V1 → V2 → V1 → V2 Signal, then the first pulse signal that one or more amplitudes are the second driving voltage V2 is exported, and it is first to export an amplitude The first pulse signal of driving voltage V1 finally exports the first pulse that one or more amplitudes are the second driving voltage V2 and believes Number.It should be noted that above-mentioned rule can be only performed once, also can repeatedly recycle.

For example, as shown in fig. 7, in discharge regime D1, driving circuit exports M the first pulse signals to power switch Pipe, to discharge the electric energy stored in previous stop phase D3 filter capacitors, wherein it is the first driving that can first export an amplitude The first pulse signal of voltage V1, then the first pulse signal that an amplitude is the second driving voltage V2 is exported, and export one Amplitude is the first pulse signal of the first driving voltage V1.So constantly cycle, the convex that " V1 → V2 → V1 " is presented change rule Rule.

According to one embodiment of present invention, the pulse width of multiple first pulse signals gradually increases or reduces, and phase The difference of the pulse width of adjacent two the first pulse signals is less than or equal to predetermined width threshold value；Alternatively, multiple amplitudes are the first drive The pulse width of the first pulse signal of dynamic voltage V1 gradually increases or reduces, and at least one amplitude is the second driving voltage V2 The pulse width of the first pulse signal be fixed as the second predetermined threshold value；Alternatively, multiple amplitudes are the of the second driving voltage V2 The pulse width of one pulse signal gradually increases or reduces, and the first pulse that at least one amplitude is the first driving voltage V1 is believed Number pulse width be fixed as the first predetermined threshold value；Alternatively, the first pulse that at least one amplitude is the first driving voltage V1 is believed Number pulse width be fixed as the first predetermined threshold value, at least one amplitude is the arteries and veins of the first pulse signal of the second driving voltage V2 It rushes width and is fixed as the second predetermined threshold value.Wherein, two neighboring amplitude is the arteries and veins of the first pulse signal of the first driving voltage V1 The difference for rushing width is also smaller than equal to predetermined width threshold value, and the first pulse that two neighboring amplitude is the second driving voltage V2 is believed Number the difference of pulse width be also smaller than equal to predetermined width threshold value.

It should be understood that pulse width can refer to the duration of high level, it refers to that pulse is wide that pulse width, which gradually increases, The overall trend of degree is incremental, and incremental manner can be a variety of, including but not limited to, gradually increase according to identical preset increments Add, either gradually increases according to different preset increments or continuous multiple pulse widths may make to protect during increasing It holds constant.Similarly, it refers to that the overall trend of pulse width successively decreases that pulse width, which is gradually reduced, decreasing fashion can be it is a variety of, Including but not limited to, it is gradually reduced, or is gradually reduced according to different preset increments, Huo Zhe according to identical preset increments Continuous multiple pulse widths may make to remain unchanged during reducing.

For example, 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, and pulse width be Y1, Y3, Y4, Y6, Y7, Y9, Y10 ..., Yp, The corresponding amplitude of the first pulse signal of Yp+1, Yp+3, Yp+4 ... be the first driving voltage V1, pulse width Y2, Y5, Y8, Y11 ..., the corresponding amplitude of the first pulse signal of Yq, Yq+3 ... be the second driving voltage V2.

By taking pulse width gradually increases as an example, increase trend, such as M pulse letter is integrally presented in M the first pulse signals Number pulse width between can meet following relationship：Yi≤Yi+1≤Yi+n, wherein i=1 to M-1, Yi are i-th of first arteries and veins The pulse width of signal is rushed, Yi+1 is the pulse width of the first pulse signal of i+1, and n is predetermined width threshold value, in other words, often The pulse width difference of two adjacent first pulse signals can be equal, i.e., is gradually increased according to identical preset increments；Or Difference there are the pulse width of two adjacent first pulse signals is zero, you can so that continuous multiple pulse widths are kept not Become.

Alternatively, the pulse for the first pulse signal that only amplitude is the first driving voltage V1 in M the first pulse signals is wide Degree increases in the manner previously described, and the first pulse signal that only amplitude is the second driving voltage V2 in M the first pulse signals Pulse width can remain unchanged.Alternatively, the first pulse that only amplitude is the second driving voltage V2 in M the first pulse signals The pulse width of signal increases in the manner previously described, and only amplitude is the first driving voltage V1's in M the first pulse signals The pulse width of first pulse signal can remain unchanged.Alternatively, amplitude is the first driving voltage V1's in M the first pulse signals The pulse width of first pulse signal individually increases in the manner previously described, and amplitude is the second driving electricity in M the first pulse signals The pulse width of the first pulse signal of V2 is pressed individually to increase in the manner previously described.

The mode that pulse width is gradually reduced and the aforementioned mode gradually increased are essentially identical, no longer repeat one by one.

In addition, the pulse width of multiple first pulse signals 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 is 1us-5us, preferably can be The increasing degree of 2us, i.e. the first pulse signal may be less than or equal to 2us, reduce amplitude and are less than or equal to 2us.Also, first Pulse width, that is, Y1 of first pulse signal can be more than or equal to 0.1us and be less than or equal to 10us.

It should be noted that the pulse width of multiple first pulse signals is smaller than predetermined width threshold value and multiple second arteries and veins Predetermined width threshold value can be more than or equal to by rushing the pulse width of signal.That is, the pulse width of any one the first pulse signal Less than the pulse width of each second pulse signal.In other words, the pulse for multiple first pulse signals that discharge regime provides is wide Degree is respectively less than the minimum pulse width in the pulse width for multiple second pulse signals that the heating period provides.Specifically, it is assumed that The pulse width of multiple second pulse signals is 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 figures 8 and 11, the driving circuit of electromagnetic heating system may include drive module and transformation Module, drive module is for output driving pulse signal to power switch tube with driving power switching tube on or off, transformation Module is used to adjust the driving voltage of drive pulse signal.The control unit of electromagnetic heating system have the first control output end and Second control output end, the first control output end are connected with drive module, and the second control output end is connected with voltage changing module, control Unit is exporting first control signal such as PPG signals and by the second control output end output the by the first control output end When two control signal such as high level signals, voltage changing module carries out transformation so that the driving voltage of drive pulse signal is adjusted to the One driving voltage V1, driving circuit can provide the first pulse signal that amplitude is the first driving voltage V1 to power switch tube；Control Unit processed is exporting first control signal such as PPG signals by the first control output end and is being exported by the second control output end When third controls signal such as low level signal, voltage changing module is remained without transformation, the driving voltage of drive pulse signal Second driving voltage V2, driving circuit can provide the second pulse signal that amplitude is the second driving voltage V2 to power switch 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 switches and between the first driving voltage and the second driving voltage The amplitude of one the first pulse signal is the first driving voltage, and the amplitude of the second pulse signal remains the second driving voltage, and First driving voltage is less than the second driving voltage, so as to inhibit the pulse current of power switch tube, and can pass through millisecond pole Duty ratio mode of heating realize low-power heating, improve 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 exporting First driving voltage V1 is operated in magnifying state, or the second driving of output to power switch tube 40 with driving power switching tube 40 Voltage V2 is operated in saturation state to power switch tube 40 with driving power switching tube 40, or exports third driving voltage to work( Rate switching tube 40 is turned off with driving power switching tube 40.

Control unit 30 is connected with driving circuit 10, and control unit 30 is used to obtain the target heating work(of electromagnetic heating system Rate, and judge whether target heating power is less than predetermined power, and when target heating power is less than predetermined power, each Controlling cycle control electromagnetic heating system sequentially enters discharge regime, heating period and stop phase, wherein in discharge regime control Driving circuit 10 processed provides multiple first pulse signals to power switch tube 40 so that the electric current for flowing through power switch tube 40 is less than Pre-set current value, and provide multiple second pulse signals to power switch tube 40 in heating period control driving circuit 10, first The amplitude of pulse signal switches between the first driving voltage V1 and the second driving voltage V2 and first the first pulse signal Amplitude is the first driving voltage V1, and the amplitude of the second pulse signal remains the second driving voltage V2, and the first driving voltage V1 Less than 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.

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.Wherein, when power switch tube 40 is operated in magnifying state, shown in Fig. 5 IGBT pipes driving voltage and electric current between relationship it is found that control unit 30 by adjusting be provided to IGBT pipes driving electricity Pressure can limit the electric current of IGBT pipes, for example, when the driving voltage for being provided to IGBT pipes is 9V, the C electrode currents of IGBT pipes can be permanent Be scheduled on 22A or so, sample the first driving voltage V1 driving IGBT pipes as a result, can by the current limit of IGBT pipes 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 40 can be IGBT, the first driving voltage V1 is preferable For 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 It is operated in magnifying state, to inhibit pulse current well.Second driving voltage V2 is preferably 15V, in the second driving Under the driving of voltage 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 when using the pulse signal driving power 40 such as IGBT pipes of switching tube of narrow spaces, due to The pulse current rising of IGBT pipes needs the regular hour, therefore, can be risen in the pulse current of IGBT pipes using narrow spaces IGBT pipes are turned off before to higher value, to effectively inhibit pulse current.According to a preferred embodiment of the present invention, amplitude is The pulse width of the first pulse signal of second driving voltage V2 is smaller than equal to 1us.

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 into Enter discharge regime D1, control unit 30 controls driving circuit 10 and first exports the pulse signal that an amplitude is the first driving voltage V1 To the control terminal of power switch tube, then output amplitude switch between the first driving voltage V1 and the second driving voltage V2 first Pulse signal (schemes filter capacitor during stop phase in previous controlling cycle to the control terminal of power switch tube 40 C1 in 11) storage electric energy release so that the collector voltage into 40 pipe of power switch when heating period D2 is essentially 0V, Reduce the pulse current of power switch tube 40.Heating period D2 is entered back into after the completion of discharge regime D1, in heating period D2, control Unit 30 processed controls driving circuit 10 and exports the second pulse signal that multiple amplitudes are the second driving voltage V2 to power switch tube 40 control terminal, so that power switch tube 40 is operated in saturation conduction state, electromagnetic heating system can carry out normal humorous at this time It shakes heating.Also, enter stop phase D3 after the completion of heating period D2, in stop phase D3, the control driving of control unit 30 Circuit 10 exports third driving voltage, that is, 0V, not output pulse signal, and power switch tube 40 turns off, and electromagnetic heating system stops at this time Only heat.

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.

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 controls the first pulse signal that first 0 output amplitude is the first driving voltage V1 of driving circuit 1 to power switch tube 40, then the first pulse signal for switching between the first driving voltage V1 and the second driving voltage V2 of output amplitude is to power switch Pipe 40, the electric energy that filter capacitor during stop phase is stored discharge.

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.

According to one embodiment of present invention, as shown in fig. 7, the pulse width of multiple first pulse signals gradually increase or Reduce, and the difference of the pulse width of two neighboring first pulse signal is less than or equal to predetermined width threshold value；Alternatively, multiple amplitudes Pulse width for the first pulse signal of the first driving voltage V1 gradually increases or reduces, and at least one amplitude is the second drive The pulse width of the first pulse signal of dynamic voltage V2 is fixed as the second predetermined threshold value；Alternatively, multiple amplitudes are the second driving electricity The pulse width of the first pulse signal of V2 is pressed to gradually increase or reduce, and that at least one amplitude is the first driving voltage V1 The pulse width of one pulse signal is fixed as the first predetermined threshold value；Alternatively, at least one amplitude is the of the first driving voltage V1 The pulse width of one pulse signal is fixed as the first predetermined threshold value, and at least one amplitude is the first pulse of the second driving voltage V2 The pulse width of signal is fixed as the second predetermined threshold value.Wherein, two neighboring amplitude is the first pulse of the first driving voltage V1 The difference of the pulse width of signal is also smaller than equal to predetermined width threshold value, and two neighboring amplitude is the of the second driving voltage V2 The difference of the pulse width of one pulse signal is also smaller than equal to predetermined width threshold value.

It should be understood that pulse width can refer to the duration of high level, it refers to that pulse is wide that pulse width, which gradually increases, The overall trend of degree is incremental, and incremental manner can be a variety of, including but not limited to, gradually increase according to identical preset increments Add, either gradually increases according to different preset increments or continuous multiple pulse widths may make to protect during increasing It holds constant..Similarly, it refers to that the overall trend of pulse width successively decreases that pulse width, which is gradually reduced, decreasing fashion can be it is a variety of, Including but not limited to, it is gradually reduced, or is gradually reduced according to different preset increments, Huo Zhe according to identical preset increments Continuous multiple pulse widths may make to remain unchanged during reducing.

By taking pulse width gradually increases as an example, increase trend, such as M pulse letter is integrally presented in M the first pulse signals Number pulse width between can meet following relationship：YM >=YM-1 >=YM-2 ..., >=Y2 >=Y1.Yi≤Yi+1≤Yi+n, In, i=1 to M-1, Yi are the pulse width of i-th of first pulse signals, and Yi+1 is the pulse of the first pulse signal of i+1 Width, n be predetermined width threshold value, in other words, the pulse width difference of each two adjacent first pulse signal can be equal, i.e., according to Identical preset increments gradually increase；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 remain unchanged.

In addition, the pulse width of multiple first pulse signals also can all same be：YM=YM-1=YM-2 ... ,=Y2= Y1。

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 figures 8 and 11, the driving circuit 10 of electromagnetic heating system may include 11 He of drive module Voltage changing module 12, drive module 11 are connected for output driving pulse signal to power switch tube 30 with driving power switching tube 30 Or shutdown, voltage changing module 12 are used to adjust the driving voltage of drive pulse signal.The control unit 30 of electromagnetic heating system has First control output end PPG and the second control output end EN, the first control output end PPG are connected with drive module 11, the second control Output end EN processed is connected with voltage changing module 12, and control unit 30 is exporting first control signal by the first control output end PPG Such as PPG signals and by the second control output end EN export second control signal such as high level signal when, voltage changing module 12 Transformation is carried out so that the driving voltage of drive pulse signal is adjusted to the first driving voltage V1, driving circuit 10 can provide amplitude and be The first pulse signal of first driving voltage V1 is to power switch tube 40；Control unit 30 is passing through the first control output end PPG It exports first control signal such as PPG signals and third is exported by the second control output end EN and control signal such as low level letter Number when, voltage changing module 12 remains the second driving voltage V2, driving circuit without transformation, the driving voltage of drive pulse signal 10 can provide the second pulse signal that amplitude is the second driving voltage V2 to power switch tube 40.

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 provide multiple first pulse signals to electromagnetic heating system in discharge regime Resonance circuit power switch tube so that flow through power switch tube electric current be less than pre-set current value, and the heating period provide Multiple second pulse signals to power switch tube, the amplitude of the first pulse signal the first driving voltage and the second driving voltage it Between switch and the amplitude of first the first pulse signal is the first driving voltage, the amplitude of the second pulse signal remains the second drive Dynamic voltage, and the first driving voltage is less than the second driving voltage.As a result, by pre-arcing mode, power switch tube can be inhibited Pulse current, 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 be suitable for electromagnetic oven, electromagnetic stove, electromagnetic rice cooker or Prevention electromagnetic pressure cooker etc..

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, electromagnetic heating apparatus can be electromagnetic oven, electromagnetic stove, electromagnetic rice cooker or electromagnetism Pressure cooker etc..

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

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 that the electric current for flowing through power switch tube is less than predetermined current Value, and multiple second pulse signals are provided to the power switch tube, the width of first pulse signal in the heating period It is described the to be worth the amplitude of switching and first the first pulse signal between the first driving voltage and second driving voltage The amplitude of one driving voltage, second pulse signal remains second driving voltage, and first driving voltage is small In 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 or reduces, and the difference of the pulse width of two neighboring first pulse signal is less than or equal to Predetermined width threshold value；

Alternatively, the pulse width that multiple amplitudes are the first pulse signal of the first driving voltage gradually increases or reduces, and at least One amplitude is that the pulse width of the first pulse signal of the second driving voltage is fixed as the second predetermined threshold value；

Alternatively, the pulse width that multiple amplitudes are the first pulse signal of the second driving voltage gradually increases or reduces, and at least One amplitude is that the pulse width of the first pulse signal of the first driving voltage is fixed as the first predetermined threshold value；

Alternatively, the pulse width that at least one amplitude is the first pulse signal of the first driving voltage is fixed as described first and presets Threshold value, at least one amplitude are that the pulse width of the first pulse signal of the second driving voltage is fixed as the described second default threshold Value.

4. the method for heating and controlling of electromagnetic heating system according to claim 3, which is characterized in that wherein, described default The value range of width threshold value is 1us-5us.

5. the method for heating and controlling of electromagnetic heating system according to claim 3, which is characterized in that wherein, described first The pulse width of a first pulse signal is more than or equal to 0.1us and is less than or equal to 10us.

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 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.

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 pre-set current value For 85A.

10. the method for heating and controlling of the electromagnetic heating system according to claim 1 or 9, which is characterized in that described first drives Dynamic 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.

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 exporting the One driving voltage drives the power switch tube to be operated in magnifying state, or the second driving of output to the power switch tube Voltage drives the power switch tube to be operated in saturation state to the power switch tube, or output third driving voltage is extremely The power switch tube is to drive the power switch tube to turn off；

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 driven first The dynamic amplitude of switching and first the first pulse signal between voltage and second driving voltage is first driving voltage, The amplitude of second pulse signal remains second driving voltage, and first driving voltage is less than described second and drives Dynamic 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 or reduces, and the difference of the pulse width of two neighboring first pulse signal be less than etc. In predetermined width threshold value；

14. the heating control apparatus of electromagnetic heating system according to claim 13, which is characterized in that wherein, described pre- If the value range of width threshold value is 1us-5us.

15. the heating control apparatus of electromagnetic heating system according to claim 13, which is characterized in that wherein, described The pulse width of one the first pulse signal is more than or equal to 0.1us and is less than or equal to 10us.

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 Be additionally operable to after entering the discharge regime preset time or the voltage over zero control the electromagnetic heating system into Enter the heating period, so that the discharge regime is in the zero passage voltage section constructed centered on the voltage over zero It is interior.

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 the predetermined current Value is 85A.

20. the heating control apparatus of the electromagnetic heating system according to claim 11 or 19, which is characterized in that described 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.

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.