CN109511188A - Electromagnetic heater, electromagnetic heating system and its control method - Google Patents
Electromagnetic heater, electromagnetic heating system and its control method Download PDFInfo
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- CN109511188A CN109511188A CN201710828930.XA CN201710828930A CN109511188A CN 109511188 A CN109511188 A CN 109511188A CN 201710828930 A CN201710828930 A CN 201710828930A CN 109511188 A CN109511188 A CN 109511188A
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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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Abstract
The invention discloses a kind of electromagnetic heating system and its control method, electromagnetic heating system includes resonant heating circuit, synchronous circuit, power switch tube and driving circuit, method is the following steps are included: control electromagnetic heating system enters current heating cycle, current heating cycle includes discharge regime, heating period and stop phase, wherein, multiple first pulse signals are exported to power switch tube in discharge regime control driving circuit；By not meeting the umber of pulse of preset condition in multiple first pulse signals of counter records to obtain current count value；The initial pulse width and/or pulse width increment of multiple first pulse signals in next heating cycle are adjusted, according to current count value so as to the driving pulse width and/or pulse width increment of adjust automatically driving circuit, effective suppressor pulse electric current.The invention also discloses a kind of electromagnetic heaters.
Description
Technical field
The present invention relates to living electric apparatus technical field, in particular to a kind of control method of electromagnetic heating system, Yi Zhong electricity
Magnetic heating system and a kind of electromagnetic heater.
Background technique
Relevant electromagnetic heating system such as electromagnetic oven usually drives IGBT pipe by driving circuit, i.e., driving circuit can mention
The on or off of IGBT pipe is controlled to IGBT pipe for driving signal.The electromagnetic oven of a kind of low-power heating, using losing wave side
Formula realizes low-power heating, in lower power stage, carries out discharge treatment in normal drive voltage using being less than, and require pulse wide
It spends small.Heating period is driven using normal width normal voltage.However the IGBT of different model pipe or peripheral drive circuit parameter
It causes in the low power discharge stage, since pulse width is small, some model IGBT to be caused to deposit PPG width responsiveness difference
It is insufficient in conducting, thus cause electric discharge to be not thorough, and excessive easy fever is lost in IGBT.And normal heating phases are being switched to,
The C pole tension of IGBT is excessively high, and it is excessive and burn to easily lead to IGBT electric current.
Therefore, there are improved needs for the relevant technologies.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose be to propose a kind of control method of electromagnetic heating system, and the driving pulse for capableing of adjust automatically driving circuit is wide
Degree, effective suppressor pulse electric current.
Second object of the present invention is to propose a kind of electromagnetic heating system, and third object of the present invention is to propose
A kind of electromagnetic heater.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of control method of electromagnetic heating system,
The electromagnetic heating system includes resonant heating circuit, synchronous circuit, power switch tube and driving circuit, the method includes with
Lower step: the electromagnetic heating system is controlled into current heating cycle, the current heating cycle includes discharge regime, heating
Stage and stop phase, wherein control the driving circuit in the discharge regime and export multiple first pulse signals to described
Power switch tube；Umber of pulse by not meeting preset condition in the multiple first pulse signal of counter records is worked as with obtaining
Preceding count value；The inceptive impulse of multiple first pulse signals described in next heating cycle is adjusted according to the current count value
Width and/or pulse width increment.
The control method of the electromagnetic heating system proposed according to embodiments of the present invention, first control electromagnetic heating system enter
Current heating cycle, and multiple first pulse signals are exported to power in the discharge regime of current heating cycle control driving circuit
Switching tube, then by not meeting the umber of pulse of preset condition in multiple first pulse signals of counter records to obtain in terms of currently
Numerical value, so according to current count value adjust in next heating cycle the initial pulse width of multiple first pulse signals and/
Or pulse width increment, so as to the driving pulse width and/or pulse width increment of adjust automatically driving circuit, with matching
The power switch tube of different model or different peripheral circuits effectively inhibit the pulse current of power switch tube, prevent power from opening
Pipe heating burnout is closed, the loss of power switch tube is reduced, improves the reliability of power switch tube.
In addition, the control method of the electromagnetic heating system proposed according to that above embodiment of the present invention can also have it is following attached
The technical characteristic added:
According to one embodiment of present invention, it is adjusted according to the current count value multiple described in next heating cycle
The initial pulse width and/or pulse width increment of first pulse signal, comprising: if the current count value is pre- less than first
If threshold value, then reduce the initial pulse width of multiple first pulse signals and/or pulse described in next heating cycle
Width increment；If the current count value is greater than the second preset threshold, increase more described in next heating cycle
The initial pulse width and/or pulse width increment of a first pulse signal, wherein second preset threshold is greater than or equal to
First preset threshold.
According to one embodiment of present invention, first preset threshold is 2-4, and second preset threshold is 9-
11。
According to one embodiment of present invention, the synchronous circuit meets default open in the state of the resonant heating circuit
It is flipped when gating condition, the control driving circuit exports multiple first pulse signals to the power switch tube packet
It includes: controlling the driving circuit and export i-th of first pulse signals to the power switch tube；In i-th of first pulses
Judge whether the turn-off time of the power switch tube reaches the default turn-off time or described synchronize electricity after the completion of signal output
Whether road is flipped；If the turn-off time of the power switch tube reaches the default turn-off time, the drive is controlled
Dynamic a first pulse signal of circuit output (i+1) is to the power switch tube, and the count value for controlling the counter increases；
If the synchronous circuit is flipped, controls the driving circuit and export (i+1) a first pulse signal to the function
Rate switching tube, and the count value for controlling the counter remains unchanged, wherein i is positive integer.
According to one embodiment of present invention, the range of the initial pulse width be more than or equal to 0.1us and be less than etc.
In 2us, the range of the pulse width increment is more than or equal to 0.05us and to be less than or equal to 2us.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electromagnetic heating system, comprising: resonance adds
Heater circuit；Power switch tube；Synchronous circuit, the synchronous circuit are connected with the resonant heating circuit, and the synchronous circuit is used
It is flipped in when the state of the resonant heating circuit meets and presets and open condition；Driving circuit, the driving circuit with
The power switch tube is connected, and the driving circuit is used to drive the on or off of the power switch tube；Control unit, institute
It states control unit to be connected with the synchronous circuit and the driving circuit respectively, described control unit adds for controlling the electromagnetism
Hot systems enter current heating cycle, and the current heating cycle includes discharge regime, heating period and stop phase, described
Discharge regime controls the driving circuit and exports multiple first pulse signals to the power switch tube, and passes through counter records
The umber of pulse of preset condition is not met in the multiple first pulse signal to obtain current count value, and according to described current
Count value adjusts the initial pulse width of multiple first pulse signals described in next heating cycle and/or pulse width increases
Amount.
The electromagnetic heating system proposed according to embodiments of the present invention, first control electromagnetic heating system enter current heating week
Phase, and multiple first pulse signals are exported to power switch tube in the discharge regime of current heating cycle control driving circuit, it connects
By not meeting the umber of pulse of preset condition to obtain current count value, in turn in multiple first pulse signals of counter records
The initial pulse width and/or pulse width of multiple first pulse signals in next heating cycle are adjusted according to current count value
Increment, so as to the driving pulse width and/or pulse width increment of adjust automatically driving circuit, to match different model
Power switch tube or different peripheral circuits effectively inhibit the pulse current of power switch tube, prevent power switch tube fever from burning
It ruins, and reduces the loss of power switch tube, improve the reliability of power switch tube.
In addition, the electromagnetic heating system proposed according to that above embodiment of the present invention can also have following additional technology special
Sign:
According to one embodiment of present invention, if the current count value is less than the first preset threshold, the control is single
Member then reduces the initial pulse width and/or pulse width of multiple first pulse signals described in next heating cycle
Increment；If the current count value is greater than the second preset threshold, described control unit then increases next heating cycle
Described in multiple first pulse signals initial pulse width and/or pulse width increment, wherein second preset threshold is big
In or equal to first preset threshold.
According to one embodiment of present invention, first preset threshold is 2-4, and second preset threshold is 9-
11。
According to one embodiment of present invention, the synchronous circuit meets default open in the state of the resonant heating circuit
It is flipped when gating condition, described control unit is further used for: controlling the driving circuit and export i-th of first pulse signals
To the power switch tube, and judge after the completion of i-th of first output of pulse signal the shutdown of the power switch tube
Whether the time reaches the default turn-off time or whether the synchronous circuit is flipped, if the shutdown of the power switch tube
Time reaches the default turn-off time, then controls the driving circuit and export (i+1) a first pulse signal to the function
Rate switching tube, and the count value for controlling several devices increases, if the synchronous circuit is flipped, controls the driving electricity
Road exports (i+1) a first pulse signal to the power switch tube, and the count value for controlling the counter remains unchanged,
Wherein, i is positive integer.
According to one embodiment of present invention, the range of the initial pulse width be more than or equal to 0.1us and be less than etc.
In 2us, the range of the pulse width increment is more than or equal to 0.05us and to be less than or equal to 2us.In order to achieve the above objectives, this hair
Bright third aspect embodiment proposes a kind of electromagnetic heater, and the electromagnetic heater includes the electromagnetic heating system
System.
The electromagnetic heater proposed according to embodiments of the present invention is capable of the driving pulse width of adjust automatically driving circuit
And/or pulse width increment, with match different model power switch tube or different peripheral circuits, effectively inhibition power switch
The pulse current of pipe prevents power switch tube heating burnout, and reduces the loss of power switch tube, and that improves power switch tube can
By property.
According to one embodiment of present invention, the electromagnetic heater can be electromagnetic oven, electromagnetic stove or electromagnetism electricity meal
Stew etc..
Detailed description of the invention
Fig. 1 is the flow chart of the control method of electromagnetic heating system according to an embodiment of the present invention；
Fig. 2 is the waveform diagram of the control method of electromagnetic heating system according to an embodiment of the invention；
Fig. 3 is the drive waveforms enlarged drawing of discharge regime in Fig. 2, heating period and stop phase；
Fig. 4 is the output of PPG pulse signal in the control method of electromagnetic heating system according to an embodiment of the invention
Schematic illustration；
Fig. 5 is the control principle drawing of the control method of electromagnetic heating system according to an embodiment of the invention；
Fig. 6 is the drive waveforms figure of discharge regime in Fig. 2；
Fig. 7 is the block diagram of electromagnetic heating system according to an embodiment of the present invention；
Fig. 8 is the circuit diagram of electromagnetic heating system accord to a specific embodiment of that present invention；And
Fig. 9 is the block diagram of electromagnetic heater according to an embodiment of the present invention.
Specific embodiment
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 is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawing come describe first aspect present invention embodiment proposition electromagnetic heating system control method.
Fig. 1 is the flow chart of the control method of electromagnetic heating system according to an embodiment of the present invention.Wherein, electromagnetic heating system
System includes resonant heating circuit, synchronous circuit, power switch tube and driving circuit.
As shown in Figure 1, the control method of the electromagnetic heating system of the embodiment of the present invention the following steps are included:
S101: control electromagnetic heating system enters current heating cycle, and current heating cycle includes discharge regime D1, heating
Stage D2 and stop phase D3, wherein export multiple first pulse signals to power in discharge regime D1 control driving circuit and open
Guan Guan.
In one embodiment of the invention, electromagnetic heating system can be used plateau voltage driving and realize low-power heating,
I.e. when target heating power W1 is less than predetermined power W2, electric discharge is sequentially entered in control each heating cycle electromagnetic heating system
Stage D1, heating period D2 and stop phase D3, wherein export multiple first pulse signals to power switch in discharge regime D1
Pipe, so that power switch tube work is in magnifying state, wherein the amplitude of the first pulse signal is the first driving voltage V1, that is, is existed
Discharge regime is open-minded by the first driving voltage V1 driving power switching tube；Multiple second pulse signals are exported in heating period D2
To power switch tube, so that power switch tube work is in saturation state, wherein the amplitude of the second pulse signal is the second driving electricity
Press V2, i.e., it is open-minded by the second driving voltage V2 driving power switching tube in the heating period；It is driven in stop phase D3 by third
Dynamic voltage V3 such as 0V driving power switching tube turns off.It is introduced into discharge regime D1 before entering heating period D2 as a result, is had
Effect inhibits the pulse current of power switch tube, and filter capacitor (i.e. the C1 of Fig. 8) during previous stop phase D3 is stored
Electric energy release, so that the collector voltage of power switch tube is essentially 0V when into heating period D2.
According to one embodiment of present invention, the first driving voltage V1 is more than or equal to 5V and is less than or equal to 14.5V, such as can
It is for example preferably 18V that preferably 9V, the second driving voltage V2, which are more than or equal to 15V,.
Further, as shown in Fig. 2, in each heating cycle, also detection is provided to the alternating current of electromagnetic heating system
Zero crossing, and electromagnetic heating system is controlled according to zero crossing and enters heating period D2 and stop phase D3.
For example, as Figure 2-3, heated using 2/4 duty ratio mode, be a control week with four alternating current half-waves
For phase, discharge regime D1 is advanced into first zero crossing, such as can first estimate first zero crossing, then basis
At the beginning of the duration of first zero crossing and discharge regime D1 that estimate obtains discharge regime D1, when this starts
It carves control electromagnetic heating system and enters discharge regime D1.As a result, after entering discharge regime D1, output amplitude is the first driving electricity
Press the first pulse signal of V1 to the control electrode (such as pole G of IGBT) of power switch tube, so that power switch tube work is being put
Big state.When detecting first zero crossing, control electromagnetic heating system enters heating period D2, i.e. heating period D2's opens
The moment begin in first near zero-crossing point, the second pulse that output amplitude is the second driving voltage V2 after first zero crossing is believed
Number to power switch tube control electrode so that power switch tube work in saturation conduction state.The duration of heating period D2
It can be two half wave cycles, in the case, when detecting third zero crossing, control electromagnetic heating system, which enters, stops rank
Section D3, the control electrode of output third driving voltage such as 0V to power switch tube, so that power switch tube works in off state,
Stop phase D3 continues two half wave cycles.
As a result, in each heating cycle, it is introduced into discharge regime D1, i.e., is driven using multiple first pulse signal such as 9V
To carry out discharge treatment, (wherein, 9V driving voltage makes power switch tube work in magnifying state, electricity to voltage driving power switching tube
Flow constant) wherein, settable smaller of the initial pulse width of multiple first pulse signals, thus effectively inhibit noise, and
And the pulse width of multiple first pulse signals can be gradually increased.Then, near zero-crossing point, heating period D2 is entered back into, i.e.,
Using multiple second pulse signals such as 18V driving voltage driving power switching tube, so that power switch tube work is led in saturation
Logical state.
It should be understood that as shown in figure 3, the pulse width of multiple first pulse signals can be gradually increased, that is to say, that
In discharge regime D1, by turning on and off for multiple first pulse signal driving power switching tubes, to discharge in stop phase
The electric energy that filter capacitor (C1 as shown in Figure 8) stores when D3, wherein multiple first pulse signals can be a with M, then M the first arteries and veins
Rush signal pulse width can for YM, YM-1, YM-2 ..., Y2, Y1, the pulse width of M the first pulse signals can gradually increase
Greatly.
According to one embodiment of present invention, the pulse width of M the first pulse signal can with pulse width increment △ Y into
Row is incremented by, i.e. Y2=Y1+ △ Y, Y3=Y2+ △ Y ..., YM=YM-1+ △ Y.Wherein, △ Y is pulse width increment, and Y1 is first
Initial pulse width, the value range of Y1 may be greater than being equal to 0.1us and be less than or equal to 2us, and the value range of △ Y may be greater than
In 0.05us and it is less than or equal to 2us., wherein when chip basic frequency be 16MHz when, single PPG width be 0.0625us, i.e., 1/
16us.I.e. the value range of △ Y is 1~32 PPG width.
S102: current to obtain by not meeting the umber of pulse of preset condition in multiple first pulse signals of counter records
Count value n.
According to one embodiment of present invention, synchronous circuit is when the state satisfaction of resonant heating circuit is preset and opens condition
It is flipped, it includes: control driving circuit output i-th that control driving circuit, which exports multiple first pulse signals to power switch tube,
A first pulse signal is to power switch tube；The shutdown of power switch tube is judged after the completion of i-th of first output of pulse signal
Whether the time reaches the default turn-off time or whether synchronous circuit is flipped；If the turn-off time of power switch tube reaches
The default turn-off time then controls driving circuit and exports (i+1) a first pulse signal to power switch tube, and control counter
Count value increase；If synchronous circuit is flipped, controls driving circuit and export (i+1) a first pulse signal to function
Rate switching tube, and the count value of control counter remains unchanged, wherein i is positive integer.
It should be noted that one is that program opens as shown in figure 4, the output of pulse signal control of driving circuit has 3
The output of moving pulse signal, that is, first pulse started is by process control；Second is that in subsequent pulse signal, using resonance electricity
The voltage Va and Vb for holding the both ends (C2 in such as Fig. 8) compare overturning and follow output (i.e. synchronous relatively to export)；Third is that subsequent
Pulse signal is forced output, i.e., forces output arteries and veins when the turn-off time reaches the default turn-off time after being arrived using the maximum turn-off time
Rush signal.For example, some special occasions, due to pulse width is too small or in voltage zero-cross stage voltage it is too low, will cause out
Logical energy is insufficient, Va and Vb ratio is less overturn, at this time the turn-off time reach the preset maximum turn-off time after will force output arteries and veins
Rush signal.
That is, preset condition can be pulse signal output when synchronous circuit is flipped.In other words, pass through counting
Device records the quantity for reaching the first pulse signal that the default turn-off time forces output in multiple first pulse signals.
Specifically, discharge regime D1 of the control driving circuit in the first heating cycle exports multiple first pulse signals for example
Voltage is 9V to power switch tube, after driving circuit exports i-th of first pulse signals to power switch tube, in i-th of arteries and veins
When rushing signal output completion becomes low level from high level, start to carry out timing to the turn-off time of power switch tube, if
Synchronous circuit is not detected always within the default turn-off time to be flipped, then forces a first pulse signal of output (i+1),
And the count value of control counter increases by 1, thus the quantity to the first pulse signal for reaching default turn-off time pressure output
It is counted；Until detect that synchronous circuit is flipped within the default turn-off time, then (i+1) a first pulse signal with
It is exported with energizing signal, control counter stops counting, and records count value at this time, that is, is denoted as n.
Wherein, synchronous circuit may include detection unit and comparator, and detection unit is for detecting resonant capacitance (in such as Fig. 8
C2) both ends voltage, such as the voltage of detectable resonant capacitance left end is to pass through the first output end output the first detection voltage
Va, and the voltage of detectable resonant capacitance right end to be to detect voltage Vb by second output terminal output second, the of detection unit
One output end and second output terminal are connected with the negative input end of comparator and positive input terminal respectively, and comparator can be to the first detection electricity
The detection of pressure Va and second voltage Vb is compared, and exports synchronization signal according to comparison result.Wherein, comparator and control unit
It is integrally disposed.
It should be noted that as shown in Figure 5 and Figure 6, in discharge regime D1, the initial pulse width foot of the first pulse signal
Enough small to be greater than equal to 0.1us and be less than or equal to 2us, the pulse increasing degree △ Y between two neighboring pulse signal also compares
It is smaller, so as to reduce pulse current, and smoothly increase electric current.But pulse width is smaller will to will cause power switch
Pipe opens energy deficiency, and the concussion condition of resonant heating circuit is not achieved, and is forced at this time using the maximum turn-off time after defeated
Out, i.e., the section D11 in Fig. 5-6, record force the umber of pulse of output at this time.With the increase of pulse width, in section D12,
Pulse width is larger to can provide enough energy, reaches the concussion condition of resonant heating circuit, is relatively exported using synchronous at this time,
Pulse signal follows synchronous circuit to compare overturning output.
As shown in Figure 5 and Figure 6, discharge regime D1 can be divided into two sections, i.e. first interval D11 and second interval
D12.In first interval D11, pulse width is smaller, and power switch tube opens energy deficiency, and resonant heating circuit is not up to
Concussion condition, synchronous circuit are not overturn, and after reaching the default turn-off time, force output pulse signal, in other words, are closed default
It can not detect that the synchronization signal of synchronous circuit output is not flipped in the disconnected time, force output pulse signal；In the secondth area
Between D12, pulse width increases, and power switch tube opens energy abundance, and resonant heating circuit reaches concussion condition, synchronous circuit
It is flipped, the output pulse signal in overturning.In other words, the same of synchronous circuit output is able to detect that within the default turn-off time
Step signal is flipped, and the output pulse signal in overturning.In the discharge regime D1 of the first heating cycle, remembered by counter
The umber of pulse n for not meeting preset condition in multiple first pulse signals is recorded, i.e., only record can not make resonant heating circuit reach humorous
The umber of pulse of vibration condition.
S103: the initial pulse width of multiple first pulse signals in next heating cycle is adjusted according to current count value
And/or pulse width increment.
It should be noted that the power switch tube or peripheral drive circuit parameter of different model are caused to PPG pulse width
Responsiveness is different, so that the energy discharged by power switch tube difference, for example, if power switch tube is wide to pulse
Degree response is insensitive, then can be when near zero-crossing point starts the heating period, and the C pole tension of power switch tube cannot be discharged into 0V,
Power switch tube work at this time is in magnifying state, and loss is excessive, and easy heating burnout；For another example, if power switch tube is to pulse
Width response is too sensitive, then can be in discharge regime, and starting current is big or electric current rises fastly, and noise is bigger.
In embodiments of the present invention, according to current heating cycle, do not meet preset condition in multiple first pulse signals
Umber of pulse adjusts the initial pulse width and/or pulse width increment of multiple first pulse signals next heating cycle, thus
The power switch tube or peripheral drive circuit parameter of different model can be matched, the pulse current of power switch tube is effectively inhibited,
Power switch tube heating burnout is prevented, and reduces the loss of power switch tube, improves the reliability of power switch tube.
According to one embodiment of present invention, if current count value n reduces next less than the first preset threshold A
The initial pulse width and/or pulse width increment of multiple first pulse signals in heating cycle；If current count value n is greater than
It is wide then to increase the initial pulse width of multiple first pulse signals and/or pulse in next heating cycle by second preset threshold B
Spend increment, wherein the second preset threshold B is greater than or equal to the first preset threshold A.
Wherein, the first preset threshold A and the second preset threshold B are stored in a control unit in advance.At of the invention one
In specific example, the first preset threshold A is desirable to be greater than 2 and the numerical value less than 4, and the second preset threshold B is desirable greater than 9 and less than 11
Numerical value.
Specifically, the first preset threshold A is preferably 3, and the second preset threshold B is preferably 10, the inceptive impulse of default
Width can be 1us, and the pulse width increment of default can be with value for 3 PPG width.
If current count value n is, for example, 3 less than the first preset threshold A, reduce in next heating cycle multiple
The initial pulse width and/or pulse width increment of first pulse signal, that is to say, that can in next heating cycle with
Three kinds of modes are adjusted the initial pulse width for only reducing multiple first pulse signals or only reduce multiple first pulses
The pulse width increment of signal or the original width and pulse width increment for reducing multiple first pulse signals simultaneously, so that under
The count value increase of one heating cycle reaches reasonable range, and between 3 to 10, thereby, it is possible to adapt to driving
The sensitive IGBT pipe of pulse width response, reduces noise.
Similarly, if it is, for example, 10 that current count value n, which is greater than the second preset threshold B, increase in next heating cycle
The initial pulse width and/or pulse width increment of big multiple first pulse signals, that is to say, that can be in next heating week
It is interim to be adjusted in a manner of three kinds, i.e., only increase the initial pulse width of multiple first pulse signals or only increases multiple
The pulse width increment of one pulse signal or the original width and pulse width increment for increasing multiple first pulse signals simultaneously,
So that the count value reduction of next heating cycle reaches reasonable range, between 3 to 10, thereby, it is possible to adapt to
Insensitive IGBT pipe is responded to driving pulse width, keeps IGBT pipe thorough in discharge regime D1 electric discharge.
Thus, it is possible to be increased according to the umber of pulse for not meeting preset condition in multiple first pulse signals of current heating cycle
The initial pulse width and/or pulse width increment of multiple first pulse signals that are big or reducing next heating cycle, so that
Discharge regime does not meet the pulse number of preset condition within the scope of 3 to 10, to adapt to the power switch tube of different model
To the different responsiveness of the driving pulse width of driving circuit, power switch tube heating burnout is prevented, and reduce power switch
The loss of pipe improves the reliability of power switch tube.
Specifically, as shown in Figure 4 and Figure 5, the control unit of electromagnetic heating system can be controlled by enable signal EN and be driven
The driving voltage of circuit output, such as when enable signal EN is in high level, driving circuit exports the first driving voltage V1, when
When enable signal EN is in low level, driving circuit exports the second driving voltage V2.
As a result, in embodiments of the present invention, first believed in the discharge regime D1 of current heating cycle using multiple first pulses
Number driving power switching tube, the first pulse signal amplitude can be 9V at this time, and pulse width is gradually increased, power switch plumber
Make in magnifying state, the electric current for flowing through power switch tube is constant, passes through in multiple first pulse signals of counter records at this time not
Meet the umber of pulse of preset condition to obtain current count value, and according to multiple in current count value acquisition next heating cycle
The initial pulse width and/or pulse width increment of first pulse signal.Amplitude is used to believe for the pulse of 18V in heating period D2
Number driving power switching tube, and pulse width uses normal width value, and power switch tube works in saturation conduction state, at this time
Power switch tube seems the effect of a conducting switch, the driving voltage of 0V is then used in stop phase D3, so that power is opened
It is in an off state to close pipe.
In conclusion the control method of the electromagnetic heating system proposed according to embodiments of the present invention, control electromagnetism first adds
Hot systems enter current heating cycle, and export multiple first pulses in the discharge regime of current heating cycle control driving circuit
Signal to power switch tube, then by do not meet in multiple first pulse signals of counter records the umber of pulse of preset condition with
Current count value is obtained, and then adjusts the initial arteries and veins of multiple first pulse signals in next heating cycle according to current count value
Width and/or pulse width increment are rushed, is increased so as to the driving pulse width and/or pulse width of adjust automatically driving circuit
Amount effectively inhibits the arteries and veins of power switch tube to match the power switch tube or different peripheral drive circuit parameters of different model
Electric current is rushed, power switch tube heating burnout is prevented, and reduces the loss of power switch tube, improves the reliability of power switch tube.
With reference to the accompanying drawing 7 and Fig. 8 come describe the second aspect of the present invention embodiment proposition electromagnetic heating system.
Fig. 7 is the block diagram of electromagnetic heating system according to an embodiment of the present invention.As shown in fig. 7, the electromagnetic heating
System 100 includes: resonant heating circuit 10, power switch tube 20, synchronous circuit 30, driving circuit 40 and control unit 50.
Wherein, synchronous circuit 30 is connected with resonant heating circuit 10, and synchronous circuit 30 is used in resonant heating circuit 10
State meets to preset to be flipped when opening condition；Driving circuit 40 is connected with power switch tube 20, and driving circuit 40 is for driving
The on or off of dynamic power switch tube 20；Control unit 50 is connected with synchronous circuit 30 and driving circuit 40 respectively, and control is single
For member 50 for controlling electromagnetic heating system into current heating cycle, current heating cycle includes discharge regime D1, heating period
D2 and stop phase D3, wherein export multiple first pulse signals to power switch in discharge regime D1 control driving circuit 40
Pipe 20, and by not meeting the umber of pulse of preset condition in multiple first pulse signals of counter records to obtain current count
Value, and according to current count value adjust in next heating cycle the initial pulse width of multiple first pulse signals and/or
Pulse width increment.
Wherein, in each heating cycle, it is introduced into discharge regime D1, i.e., is driven using multiple first pulse signal such as 9V
To carry out discharge treatment, (wherein, 9V driving voltage makes power switch tube work in magnifying state, electricity to voltage driving power switching tube
Flow constant) wherein, settable smaller of the initial pulse width of multiple first pulse signals, thus effectively inhibit noise, and
And the pulse width of multiple first pulse signals can be gradually increased.Then, near zero-crossing point, heating period D2 is entered back into, i.e.,
Using multiple second pulse signals such as 18V driving voltage driving power switching tube, so that power switch tube work is led in saturation
Logical state.
It should be understood that as shown in figure 3, the pulse width of multiple first pulse signals can be gradually increased, that is to say, that
In discharge regime D1, by turning on and off for multiple first pulse signal driving power switching tubes 20, rank is being stopped with release
The electric energy that filter capacitor (C1 as shown in Figure 8) stores when section D3, wherein multiple first pulse signals can be with M, then and M first
The pulse width of pulse signal can for YM, YM-1, YM-2 ..., Y2, Y1, the pulse width of M the first pulse signals can be gradually
Increase.
According to one embodiment of present invention, the pulse width of M the first pulse signal can with pulse width increment △ Y into
Row is incremented by, i.e. Y2=Y1+ △ Y, Y3=Y2+ △ Y ..., YM=YM-1+ △ Y.Wherein, △ Y is pulse width increment, and Y1 is first
Initial pulse width, the value range of Y1 may be greater than being equal to 0.1us and be less than or equal to 2us, and the value range of △ Y may be greater than
In 0.05us and be less than or equal to 2us, wherein when chip basic frequency be 16MHz when, single PPG width be 0.0625us, i.e., 1/
16us。
According to one embodiment of present invention, control unit 50 are further used for: control driving circuit 40 exports i-th
First pulse signal judges power switch tube 20 to power switch tube 20 after the completion of i-th of first output of pulse signal
Whether the turn-off time reaches the default turn-off time or whether synchronous circuit 30 is flipped, if the shutdown of power switch tube 20
Time reaches the default turn-off time, then controls driving circuit 40 and export (i+1) a first pulse signal to power switch tube 20,
And the count value of control counter increases, if synchronous circuit 30 is flipped, it is a to control the output of driving circuit 40 (i+1)
First pulse signal is to power switch tube 20, and the count value of control counter remains unchanged, wherein i is positive integer.
It should be noted that one is program as shown in figure 4, the output of pulse signal control of driving circuit 40 has 3
The output of starting impulse signal, that is, first pulse started is by process control；Second is that in subsequent pulse signal, using resonance
The voltage Va and Vb at the both ends capacitor (C2 in such as Fig. 8) compare overturning and follow output (i.e. synchronous relatively to export)；Third is that subsequent
Pulse signal, output is forced after arriving using the maximum turn-off time, i.e., forces output when the turn-off time reaches the default turn-off time
Pulse signal.For example, some special occasions, due to pulse width is too small or in voltage zero-cross stage voltage it is too low, will cause
Open energy deficiency, Va and Vb ratio less overturn, at this point, the turn-off time reach the preset maximum turn-off time after will force output
Pulse signal.
That is, preset condition can be pulse signal output when synchronous circuit 30 is flipped.In other words, pass through meter
Number device records the quantity for reaching the first pulse signal that the default turn-off time forces output in multiple first pulse signals.
Specifically, discharge regime D1 of the control driving circuit 40 in the first heating cycle exports multiple first pulse signal examples
If voltage is 9V to power switch tube 20, after driving circuit 40 exports i-th of first pulse signals to power switch tube 20,
When i-th of output of pulse signal is completed to become low level from high level, start to carry out the turn-off time of power switch tube 20
Timing is flipped if synchronous circuit 30 is not detected always within the default turn-off time, forces output (i+1) a the
One pulse signal, and the count value of control counter increases by 1, to force the first pulse exported to the default turn-off time is reached
The quantity of signal is counted；Until detect that synchronous circuit 30 is flipped within the default turn-off time, then (i+1) a the
One pulse signal follows energizing signal to export, and control counter stops counting, and records count value at this time, that is, is denoted as n.
Wherein, synchronous circuit 30 may include detection unit 70 and comparator 60, and detection unit 70 is for detecting resonant capacitance
The voltage at the both ends (C2 in such as Fig. 8), such as the voltage of detectable resonant capacitance left end is to pass through the first output end output first
Voltage Va is detected, and the voltage of detectable resonant capacitance right end is to pass through second output terminal output the second detection voltage Vb, detection
The first output end and second output terminal of unit 70 are connected with the negative input end of comparator 60 and positive input terminal respectively, comparator 60
First detection voltage Va and the second detection voltage Vb can be compared, and synchronization signal is exported according to comparison result.Wherein, than
It is integrally disposed compared with device 60 and control unit 50.
It should be noted that as shown in Figure 5 and Figure 6, in discharge regime D1, the initial pulse width foot of the first pulse signal
Enough small to be greater than equal to 0.1us and be less than or equal to 2us, the pulse increasing degree △ Y between two neighboring pulse signal also compares
It is smaller, so as to reduce pulse current, and smoothly increase electric current.But pulse width is smaller will to will cause power switch
Pipe 20 opens energy deficiency, and the concussion condition of resonant heating circuit 10 is not achieved, at this time using the maximum turn-off time to it is rear by force
System exports, i.e. section D11 in Fig. 5-6, record forces the umber of pulse of output at this time.With the increase of pulse width, in section
D12, pulse width is larger to can provide enough energy, reaches the concussion condition of resonant heating circuit 10, at this time using synchronous ratio
Compared with output, pulse signal follows synchronous circuit 30 to compare overturning output.
As shown in Figure 5 and Figure 6, discharge regime D1 can be divided into two sections, i.e. first interval D11 and second interval
D12.In first interval D11, pulse width is smaller, and power switch tube 20 opens energy deficiency, and resonant heating circuit 10 is not
Reaching concussion condition, synchronous circuit 30 is not overturn, after reaching the default turn-off time, output pulse signal is forced, in other words,
The synchronization signal that can not detect that synchronous circuit 30 exports in the default turn-off time is not flipped, forces output pulse signal；
In second interval D12, pulse width increases, and power switch tube 20 opens energy abundance, and resonant heating circuit 10 reaches concussion
Condition, synchronous circuit 30 are flipped, the output pulse signal in overturning.In other words, it is able to detect that within the default turn-off time
The synchronization signal that synchronous circuit 30 exports is flipped, and the output pulse signal in overturning.In the electric discharge of the first heating cycle
Stage D1, by not meeting the umber of pulse n of preset condition in multiple first pulse signals of counter records, i.e., only record can not make
Resonant heating circuit 10 reaches the umber of pulse of condition of resonance.
It should be noted that the power switch tube 20 or peripheral drive circuit parameter of different model cause it is wide to PPG pulse
Spend that responsiveness is different, so that the energy discharged by power switch tube 20 difference, for example, if power switch tube 20 is right
Pulse width response is insensitive, then can be when near zero-crossing point starts the heating period, and the C pole tension of power switch tube 20 cannot be released
It is put into 0V, the work of power switch tube 20 at this time is in magnifying state, and loss is excessive, and easy heating burnout；For another example, if power switch
The response of 20 pulse-width of pipe is too sensitive, then can be before near zero-crossing point starts the heating period, the pole C of power switch tube 20
Voltage is discharged into 0V in advance, and the pulse current of power switch tube is larger at this time, and noise is bigger.
In embodiments of the present invention, according to current heating cycle, do not meet preset condition in multiple first pulse signals
Umber of pulse adjusts the initial pulse width and/or pulse width increment of multiple first pulse signals next heating cycle, thus
The power switch tube or different peripheral circuits, effective pulse current for inhibiting power switch tube that different model can be matched are prevented
Only power switch tube heating burnout, and the loss of power switch tube is reduced, improve the reliability of power switch tube.
According to one embodiment of present invention, if current count value n reduces next less than the first preset threshold A
The initial pulse width and/or pulse width increment of multiple first pulse signals in heating cycle；If current count value n is greater than
It is wide then to increase the initial pulse width of multiple first pulse signals and/or pulse in next heating cycle by second preset threshold B
Spend increment, wherein the second preset threshold B is greater than or equal to the first preset threshold A.
Wherein, the first preset threshold A and the second preset threshold B are stored in advance in control unit 50.Of the invention one
In a specific example, the first preset threshold A is desirable to be greater than 2 and the numerical value less than 4, and the second preset threshold B is desirable to be greater than 9 and be less than
11 numerical value.
Specifically, the first preset threshold A is preferably 3, and the second preset threshold B is preferably 10, the inceptive impulse of default
Width can be 1us, and the pulse width increment of default can be with value for 3 PPG width.
If current count value n is, for example, 3 less than the first preset threshold A's, reduce in next heating cycle more
The initial pulse width and/or pulse width increment of a first pulse signal, that is to say, that can be in next heating cycle
It is adjusted the initial pulse width for only reducing multiple first pulse signals in a manner of three kinds or only reduces multiple first arteries and veins
It rushes the pulse width increment of signal or reduces the original width and pulse width increment of multiple first pulse signals simultaneously, so that
The count value increase of next heating cycle reaches reasonable range, and between 3 to 10, thereby, it is possible to adapt to drive
The sensitive IGBT pipe of moving pulse width response, reduces noise.
Similarly, if it is, for example, 10 that current count value n, which is greater than the second preset threshold B, increase in next heating cycle
The initial pulse width and/or pulse width increment of big multiple first pulse signals, that is to say, that can be in next heating week
It is interim to be adjusted in a manner of three kinds, i.e., only increase the initial pulse width of multiple first pulse signals or only increases multiple
The pulse width increment of one pulse signal or the original width and pulse width increment for increasing multiple first pulse signals simultaneously,
So that the count value reduction of next heating cycle reaches reasonable range, between 3 to 10, thereby, it is possible to adapt to
Insensitive IGBT pipe is responded to driving pulse width, keeps IGBT pipe thorough in discharge regime D1 electric discharge.
Thus, it is possible to be increased according to the umber of pulse for not meeting preset condition in multiple first pulse signals of current heating cycle
The initial pulse width and/or pulse width increment of multiple first pulse signals that are big or reducing next heating cycle, so that
Pulse number in heating cycle is within the scope of 3 to 10, to adapt to the power switch tube 20 of different model to driving circuit
The different responsiveness of 40 driving pulse width, prevent power switch tube heating burnout, and reduce the loss of power switch tube,
Improve the reliability of power switch tube.
Specifically, as shown in Figure 4 and Figure 5, the control unit 50 of electromagnetic heating system can be controlled by enable signal EN and be driven
The driving voltage that dynamic circuit 40 exports, such as when enable signal EN is in high level, the output of driving circuit 40 first driving electricity
V1 is pressed, when enable signal EN is in low level, driving circuit 40 exports the second driving voltage V2.
As a result, in embodiments of the present invention, first believed in the discharge regime D1 of current heating cycle using multiple first pulses
Number driving power switching tube 20, the first pulse signal amplitude can be 9V at this time, and pulse width is gradually increased, power switch tube
In magnifying state, the electric current for flowing through power switch tube 20 is constant for 20 work, passes through the multiple first pulse letters of counter records at this time
The umber of pulse of preset condition is not met in number to obtain current count value, and next heating cycle is obtained according to current count value
In multiple first pulse signals initial pulse width and/or pulse width increment.Use amplitude for 18V in heating period D2 again
Pulse signal driving power switching tube 20, and pulse width use normal width value, power switch tube 20 work be saturated
On state, power switch tube 20 seems the effect of a conducting switch at this time, and the driving of 0V is then used in stop phase D3
Voltage, so that power switch tube 20 is in an off state.
In conclusion the electromagnetic heating system proposed according to embodiments of the present invention, control electromagnetic heating system first enters
Current heating cycle, and multiple first pulse signals are exported to power in the discharge regime of current heating cycle control driving circuit
Switching tube, then by not meeting the umber of pulse of preset condition in multiple first pulse signals of counter records to obtain in terms of currently
Numerical value, so according to current count value adjust in next heating cycle the initial pulse width of multiple first pulse signals and/
Or pulse width increment, so as to the driving pulse width and/or pulse width increment of adjust automatically driving circuit, with matching
The power switch tube of different model or different peripheral circuits effectively inhibit the pulse current of power switch tube, prevent power from opening
Pipe heating burnout is closed, and reduces the loss of power switch tube, improves the reliability of power switch tube.
With reference to the accompanying drawing 9 come describe the third aspect of the present invention embodiment proposition electromagnetic heater.
Fig. 9 is the block diagram of electromagnetic heater according to embodiments of the present invention.As shown in figure 9, the electromagnetic heating fills
Setting 200 includes above-mentioned electromagnetic heating system 100.
According to one embodiment of present invention, electromagnetic heater 200 can be electromagnetic oven, electromagnetic stove or electromagnetic rice cooker
Deng.
In conclusion the electromagnetic heater proposed according to embodiments of the present invention, can open according to the power of different model
Close pipe to the driving pulse width of the different responsiveness adjust automatically driving circuits of the driving pulse width of driving circuit and/or
Pulse width increment, with match different model power switch tube or different peripheral circuit, effectively inhibit power switch tube
Pulse current prevents power switch tube heating burnout, and reduces the loss of power switch tube, improves the reliable of power switch tube
Property.
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 the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting 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, " M, N number of " is meant that 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；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
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 in the second feature " on " or " down " can be with
It is that the first and second features directly 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
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height 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
One or M, can be combined in any suitable manner in N number of embodiment or example.In addition, without conflicting with each other, this field
Technical staff can carry out the feature of different embodiments or examples described in this specification and different embodiments or examples
Combination and combination.
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, modifies, replacement and variant.
Claims (12)
1. a kind of control method of electromagnetic heating system, which is characterized in that the electromagnetic heating system include resonant heating circuit,
Synchronous circuit, power switch tube and driving circuit, the described method comprises the following steps:
The electromagnetic heating system is controlled into current heating cycle, the current heating cycle includes discharge regime, heating rank
Section and stop phase, wherein control the driving circuit in the discharge regime and export multiple first pulse signals to the function
Rate switching tube；
By not meeting the umber of pulse of preset condition in the multiple first pulse signal of counter records to obtain current count
Value；
The initial pulse width of multiple first pulse signals described in next heating cycle is adjusted according to the current count value
And/or pulse width increment.
2. the control method of electromagnetic heating system according to claim 1, which is characterized in that according to the current count value
Adjust the initial pulse width and/or pulse width increment of multiple first pulse signals described in next heating cycle, comprising:
If the current count value reduces multiple first described in next heating cycle less than the first preset threshold
The initial pulse width and/or pulse width increment of pulse signal；
If the current count value is greater than the second preset threshold, increase multiple first described in next heating cycle
The initial pulse width and/or pulse width increment of pulse signal, wherein second preset threshold is greater than or equal to described the
One preset threshold.
3. the control method of electromagnetic heating system according to claim 2, which is characterized in that first preset threshold is
2-4, and second preset threshold is 9-11.
4. the control method of electromagnetic heating system according to claim 1, which is characterized in that the synchronous circuit is described
The state of resonant heating circuit meets to preset to be flipped when opening condition, the control driving circuit output multiple first
Pulse signal to the power switch tube includes:
It controls the driving circuit and exports i-th of first pulse signals to the power switch tube；
Judge whether the turn-off time of the power switch tube reaches default after the completion of i-th of first output of pulse signal
Whether turn-off time or the synchronous circuit are flipped；
If the turn-off time of the power switch tube reaches the default turn-off time, driving circuit output the is controlled
(i+1) a first pulse signal is to the power switch tube, and the count value for controlling the counter increases；
If the synchronous circuit is flipped, controls the driving circuit and export (i+1) a first pulse signal to institute
Power switch tube is stated, and the count value for controlling the counter remains unchanged, wherein i is positive integer.
5. the control method of electromagnetic heating system according to claim 1, which is characterized in that the initial pulse width
Range is more than or equal to 0.1us and to be less than or equal to 2us, and the range of the pulse width increment is more than or equal to 0.05us and to be less than
Equal to 2us.
6. a kind of electromagnetic heating system characterized by comprising
Resonant heating circuit；
Power switch tube；
Synchronous circuit, the synchronous circuit are connected with the resonant heating circuit, and the synchronous circuit in the resonance for adding
The state of heater circuit meets to preset to be flipped when opening condition；
Driving circuit, the driving circuit are connected with the power switch tube, and the driving circuit is for driving the power to open
Close the on or off of pipe；
Control unit, described control unit are connected with the synchronous circuit and the driving circuit respectively, and described control unit is used
Enter current heating cycle in controlling the electromagnetic heating system, the current heating cycle includes discharge regime, heating period
And stop phase, wherein control the driving circuit in the discharge regime and export multiple first pulse signals to the power
Switching tube, and it is current to obtain by not meeting the umber of pulse of preset condition in the multiple first pulse signal of counter records
Count value, and adjust according to the current count value the initial arteries and veins of multiple first pulse signals described in next heating cycle
Rush width and/or pulse width increment.
7. electromagnetic heating system according to claim 6, which is characterized in that
If the current count value then reduces next heating cycle less than the first preset threshold, described control unit
Described in multiple first pulse signals initial pulse width and/or pulse width increment；
If the current count value is greater than the second preset threshold, described control unit then increases next heating cycle
Described in multiple first pulse signals initial pulse width and/or pulse width increment, wherein second preset threshold is big
In or equal to first preset threshold.
8. electromagnetic heating system according to claim 7, which is characterized in that first preset threshold is 2-4, and described
Second preset threshold is 9-11.
9. electromagnetic heating system according to claim 6, which is characterized in that the synchronous circuit heats electricity in the resonance
The state on road meets to preset to be flipped when opening condition, and described control unit is further used for, and it is defeated to control the driving circuit
I-th of first pulse signals are to the power switch tube out, and institute is judged after the completion of i-th of first output of pulse signal
The turn-off time for stating power switch tube whether reaches the default turn-off time or whether the synchronous circuit is flipped, if institute
The turn-off time for stating power switch tube reaches the default turn-off time, then controls driving circuit output (i+1) a the
One pulse signal is to the power switch tube, and the count value for controlling the counter increases, if the synchronous circuit occurs
Overturning then controls the driving circuit and exports (i+1) a first pulse signal to the power switch tube, and controls the meter
The count value of number device remains unchanged, wherein i is positive integer.
10. electromagnetic heating system according to claim 6, which is characterized in that the range of the initial pulse width is big
In being equal to 0.1us and being less than or equal to 2us, the range of the pulse width increment is more than or equal to 0.05us and to be less than or equal to 2us.
11. a kind of electromagnetic heater, which is characterized in that including the electromagnetic heating according to any one of claim 6-10
System.
12. electromagnetic heater according to claim 11, which is characterized in that the electromagnetic heater be electromagnetic oven,
Electromagnetic stove or electromagnetic rice cooker.
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