CN106714353A - Method and system for determining zero crossing conduction time and electromagnetic heating device - Google Patents
Method and system for determining zero crossing conduction time and electromagnetic heating device Download PDFInfo
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- CN106714353A CN106714353A CN201510484198.XA CN201510484198A CN106714353A CN 106714353 A CN106714353 A CN 106714353A CN 201510484198 A CN201510484198 A CN 201510484198A CN 106714353 A CN106714353 A CN 106714353A
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Abstract
The invention provides a method and system for determining a zero crossing conduction time and an electromagnetic heating device. The method comprises a step of obtaining a sampling signal of a collector in a specified time of applying an electrical load signal of a specified duty ratio to the collector, a step of judging whether a trigger signal is generated according to the sampling signal, a step of determining the threshold range of the zero crossing conduction time according to the size relation between the trigger signal and a first preset trigger signal, the size relation between the sampling signal and a second preset trigger signal, and the size relation between the sampling signal and a third preset trigger signal when the generation of the trigger signal is judged, wherein the first preset trigger signal is smaller than the second preset trigger signal, and the second preset trigger signal is smaller than the third preset trigger signal. Through the technical scheme of the invention, the electromagnetic heating device is matched with a plurality of cooking utensils, the cooking utensils are heated with an optimal working mode, the power consumption is reduced, and the use experience of a user is improved.
Description
Technical field
The present invention relates to household electrical appliance technical field, more specifically, it is related to a kind of passing zero trigger time
Determine method, a kind of determination system of passing zero trigger time and a kind of electromagnetic heater.
Background technology
In the related art, existing electromagnetic oven IGBT (Insulated Gate Bipolar Transistor,
Insulated gate bipolar transistor) drive scheme be all to be solidificated in the program of controller, by sentencing
Pot program determines the type of pan, is found in program by tabling look-up opening when electromagnetic oven is operated
Drive scheme is heated with controlling electromagnetic oven.Pan for commonly using and parameter does not change is usual
Can be with the working time under relatively good matching its correspondence power, but for the material of rarely needed pan
Matter parameter has relatively large deviation with the material parameters of general pan, then the difficult drive by tabling look-up in acquisition program
Dynamic scheme, cause pan can not compatibility well, cause power output deviation to compare larger, product
Poor reliability.
Therefore, the passing zero trigger time for how determining IGBT and then the heating mode for determining different pans
As technical problem urgently to be resolved hurrily.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.
Therefore, it is an object of the present invention to proposing a kind of determination side of new passing zero trigger time
Method.
It is another object of the present invention to propose a kind of determination system of passing zero trigger time.
A further object of the present invention is to propose a kind of electromagnetic heater.
To achieve the above object, a kind of embodiment according to the first aspect of the invention, it is proposed that passing zero trigger
The determination method of time, including：Applying to specify the finger after the electric loading signal of dutycycle to the colelctor electrode
In fixing time, the sampled signal of the colelctor electrode is obtained；Judge whether to produce according to the sampled signal and touch
Signal；When judging to produce the trigger signal, according to the trigger signal and the first default triggering
The magnitude relationship of signal, the magnitude relationship that the sampled signal presets trigger signal with second, Yi Jisuo
The magnitude relationship of sampled signal and the 3rd default trigger signal is stated, the threshold of the passing zero trigger time is determined
Value scope, wherein, the described first default trigger signal is described less than the described second default trigger signal
Second default trigger signal is less than the described 3rd default trigger signal.
The determination method of zero ON time according to an embodiment of the invention, by detecting sampled signal and the
One default trigger signal and the second default trigger signal and magnitude relationship with the 3rd trigger signal,
The scope of passing zero trigger time is determined, so as to improve the reliability of IGBT, makes it as many as possible
Work in passing zero trigger state, and then saved power consumption, improve reliability, wherein, first is pre-
If trigger signal corresponds to advanced Continuity signal, the second default trigger signal corresponds to passing zero trigger signal,
3rd default trigger signal corresponds to delayed Continuity signal.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the time length that preceding thyristor switch is opened,
The intensity of LC (coil panel and resonant capacitance) loop power is determined, energy intensity determines LC concussions
Wave amplitude, and then V can be predictedCEThe voltage change amplitude of (voltage between colelctor electrode and emitter stage), closes
The V of IGCT when the IGCT LC (coil panel and resonant capacitance) that has no progeny shakes naturallyCE(colelctor electrode and hair
Voltage between emitter-base bandgap grading) voltage follow fluctuation, wherein, VCEAmplitude it is larger, and the sampled signal of base stage
With VCEPositive correlation, therefore, using the sampled signal of base stage as the foundation for judging passing zero trigger, reduce
Detection range, improves the reliability of detection process.
Wherein, it is by obtaining the sampled signal of the base stage of thyristor switch and the sampled signal of gained is defeated
Enter AD conversion module (D/A converter module) that single-chip microcomputer carries or first pass through AD conversion chip and again will
Gained signal input realizes the conversion between analog signal and data signal, and will obtain to single-chip microcomputer
Data signal indirect assignment to program so that single-chip microcomputer can be quickly determined that with the presence or absence of passing zero trigger
The electric signal of point, i.e. trigger point from null value or negative value be changed on the occasion of when point, single-chip microcomputer is by recognizing zero passage
Turn on this point, and the self-resonance voltage after shut-off is compared with the reference voltage of setting, allow monolithic
Machine judges and is automatically found the optimal passing zero trigger time of thyristor switch.
In addition, the determination method of the passing zero trigger time provided according to the above embodiment of the present invention, also has
Following additional technical feature：
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, according to institute
The magnitude relationship of trigger signal and the first default trigger signal is stated, the sampled signal and second are preset and touch
The magnitude relationship of signalling, and the magnitude relationship that the sampled signal presets trigger signal with the 3rd,
Determine the threshold range of the passing zero trigger time, including step in detail below：It is determined that the triggering
Signal presets trigger signal more than or equal to described first, and during less than the described second default trigger signal,
The trigger signal is judged to the first trigger signal, the moment of first trigger signal is recorded, with
Using the moment of first trigger signal as the threshold range lower limit.
The determination method of passing zero trigger time, touches by the way that judgement first is default according to an embodiment of the invention
Signal, it is determined that the lower limit of passing zero trigger time, improve the passing zero trigger time to IGBT
Control, and then reduce power consumption.
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, root
According to the magnitude relationship of the trigger signal and the first default trigger signal, the sampled signal and second pre-
If the magnitude relationship of trigger signal, and the sampled signal is closed with the size of the 3rd default trigger signal
System, determines the threshold range of the passing zero trigger time, also including step in detail below：It is determined that institute
Trigger signal is stated more than or equal to the described second default trigger signal, and less than the described 3rd default triggering
During signal, the trigger signal is judged to the second trigger signal, records second trigger signal
Duration, using the duration of second trigger signal as passing zero trigger time reference value.
The determination method of passing zero trigger time, touches by the way that judgement second is default according to an embodiment of the invention
Signal, it is determined that a reference value of passing zero trigger time, further increasing the zero passage to IGBT
The control of ON time, create a further reduction power consumption.
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, root
According to the magnitude relationship of the trigger signal and the first default trigger signal, the sampled signal and second pre-
If the magnitude relationship of trigger signal, and the sampled signal is closed with the size of the 3rd default trigger signal
System, determines the threshold range of the passing zero trigger time, also including step in detail below：It is determined that institute
Trigger signal is stated more than or equal to the described 3rd default trigger signal, the trigger signal is judged to the
Three trigger signals, record the moment of the 3rd trigger signal, by the 3rd trigger signal when
Carve as the higher limit of the threshold range.
The determination method of passing zero trigger time, touches by the way that judgement the 3rd is default according to an embodiment of the invention
Signal, it is determined that the higher limit of passing zero trigger time, further increasing the zero passage to IGBT
The control of ON time, further reduces power consumption.
According to one embodiment of present invention, it is preferable that judged whether to produce according to the sampled signal
Trigger signal, including step in detail below：When judging not producing the trigger signal, increase electricity is negative
The dutycycle of information carrying number, and the electric loading signal of dutycycle as the electricity of the specified dutycycle will be increased
Load signal.
The determination method of passing zero trigger time according to an embodiment of the invention, by being not detected by triggering
During signal, the dutycycle of electric loading signal is improved, namely improve the power for putting on IGBT, so that plus
The fast efficiency for determining the passing zero trigger time, wherein, the raising of dutycycle can be according to default step value,
Or tested according to default power curve, untill trigger signal is produced.
A kind of embodiment according to a second aspect of the present invention, it is also proposed that determination system of passing zero trigger time
System, including：Acquiring unit, for applying to specify the electric loading signal of dutycycle to the colelctor electrode
In the specified time afterwards, the sampled signal of the colelctor electrode is obtained；Judging unit, for according to described
Sampled signal judges whether to produce trigger signal；Determining unit, for judging to produce the triggering letter
Number when, according to the magnitude relationship of the trigger signal and the first default trigger signal, the sampled signal
With the magnitude relationship of the second default trigger signal, and the sampled signal and the 3rd default trigger signal
Magnitude relationship, determine the threshold range of the passing zero trigger time, wherein, described first default touches
Signal less than the described second default trigger signal, the described second default trigger signal is less than the described 3rd
Default trigger signal.
The determination system of passing zero trigger time according to an embodiment of the invention, by detecting sampled signal
With the first default trigger signal and the second default trigger signal and size with the 3rd trigger signal
Relation, it is determined that the scope of passing zero trigger time, so as to improve the reliability of IGBT, uses up it
Passing zero trigger state may more be worked in, and then save power consumption, improve reliability, wherein,
First default trigger signal corresponds to advanced Continuity signal, and the second default trigger signal is led corresponding to zero passage
Messenger, the 3rd default trigger signal corresponds to delayed Continuity signal.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the time length that preceding thyristor switch is opened,
The intensity of LC (coil panel and resonant capacitance) loop power is determined, energy intensity determines LC concussions
Wave amplitude, and then V can be predictedCEThe voltage change amplitude of (voltage between colelctor electrode and emitter stage), closes
The V of IGCT when the IGCT LC (coil panel and resonant capacitance) that has no progeny shakes naturallyCE(colelctor electrode and hair
Voltage between emitter-base bandgap grading) voltage follow fluctuation, wherein, VCEAmplitude it is larger, and the sampled signal of base stage
With VCEPositive correlation, therefore, using the sampled signal of base stage as the foundation for judging passing zero trigger, reduce
Detection range, improves the reliability of detection process.
Wherein, it is by obtaining the sampled signal of the base stage of thyristor switch and the sampled signal of gained is defeated
Enter AD conversion module (D/A converter module) that single-chip microcomputer carries or first pass through AD conversion chip and again will
Gained signal input realizes the conversion between analog signal and data signal, and will obtain to single-chip microcomputer
Data signal indirect assignment to program so that single-chip microcomputer can be quickly determined that with the presence or absence of passing zero trigger
The electric signal of point, i.e. trigger point from null value or negative value be changed on the occasion of when point, single-chip microcomputer is by recognizing zero passage
Turn on this point, and the self-resonance voltage after shut-off is compared with the reference voltage of setting, allow monolithic
Machine judges and is automatically found the optimal passing zero trigger time of thyristor switch.
According to one embodiment of present invention, it is preferable that the determining unit also includes：Recording unit,
For it is determined that the trigger signal is more than or equal to the described first default trigger signal, and less than described
During the second default trigger signal, the trigger signal is judged to the first trigger signal, records described the
The moment of one trigger signal, using the moment of first trigger signal as under the threshold range
Limit value.
The determination system of passing zero trigger time, is preset by judging first according to an embodiment of the invention
Trigger signal, it is determined that the lower limit of passing zero trigger time, when improve the passing zero trigger to IGBT
Between control, and then reduce power consumption.
According to one embodiment of present invention, it is preferable that the recording unit is additionally operable to, it is determined that institute
Trigger signal is stated more than or equal to the described second default trigger signal, and less than the described 3rd default triggering
During signal, the trigger signal is judged to the second trigger signal, records second trigger signal
Duration, using the duration of second trigger signal as passing zero trigger time reference value.
The determination system of passing zero trigger time, is preset by judging second according to an embodiment of the invention
Trigger signal, it is determined that a reference value of passing zero trigger time, further increasing the mistake to IGBT
The control of zero ON time, create a further reduction power consumption.
According to one embodiment of present invention, it is preferable that the recording unit is additionally operable to, it is determined that institute
Trigger signal is stated more than or equal to the described 3rd default trigger signal, the trigger signal is judged to the
Three trigger signals, record the moment of the 3rd trigger signal, by the 3rd trigger signal when
Carve as the higher limit of the threshold range.
The determination system of passing zero trigger time, is preset by judging the 3rd according to an embodiment of the invention
Trigger signal, it is determined that the higher limit of passing zero trigger time, further increasing the mistake to IGBT
The control of zero ON time, further reduces power consumption.
According to one embodiment of present invention, it is preferable that also include：Increase unit, for judging
When not producing the trigger signal, increase the dutycycle of electric loading signal, and the electricity of dutycycle will be increased
Load signal as the specified dutycycle electric loading signal.
The determination system of passing zero trigger time according to an embodiment of the invention, by being not detected by triggering
During signal, the dutycycle of electric loading signal is improved, namely improve the power for putting on IGBT, so that plus
The fast efficiency for determining the passing zero trigger time, wherein, the raising of dutycycle can be according to default step value,
Or tested according to default power curve, untill trigger signal is produced.
A kind of embodiment according to a third aspect of the present invention, it is also proposed that electromagnetic heater, including as above
State the determination system of the passing zero trigger time described in any one technical scheme.
Additional aspect of the invention and advantage will be given in following description section, partly will be under
Become obvious in the description in face, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage are from description of the accompanying drawings below to embodiment is combined
Will be apparent and be readily appreciated that, wherein：
Fig. 1 shows the signal of the determination method of passing zero trigger time according to an embodiment of the invention
Flow chart；
Fig. 2 shows the signal of the determination system of passing zero trigger time according to an embodiment of the invention
Block diagram；
Fig. 3 shows the structured flowchart of electromagnetic heater according to an embodiment of the invention；
Fig. 4 shows the signal of the control method of electromagnetic heater according to an embodiment of the invention
Flow chart；
Fig. 5 shows the real-time testing figure of Electromagnetic Heating control according to an embodiment of the invention；
Fig. 6 shows the real-time testing figure of Electromagnetic Heating control according to another embodiment of the invention.
Specific embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, with reference to attached
Figure and specific embodiment are further described in detail to the present invention.It should be noted that not
In the case of conflict, the feature in embodiments herein and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but,
The present invention can also be different from mode described here to implement using other, therefore, guarantor of the invention
Shield scope is not limited by following public specific embodiment.
Fig. 1 shows the signal of the determination method of passing zero trigger time according to an embodiment of the invention
Flow chart.
As shown in figure 1, the determination method of passing zero trigger time according to embodiments of the present invention, including：Step
102, the colelctor electrode is being applied to specify in the specified time after the electric loading signal of dutycycle, obtain institute
State the sampled signal of colelctor electrode；Step 104, judges whether to produce trigger signal according to the sampled signal；
Step 106 is big with the first default trigger signal according to the trigger signal during the raw trigger signal
Small relation, the magnitude relationship that the sampled signal presets trigger signal with second, and the sampling letter
Magnitude relationship number with the 3rd default trigger signal, determines the threshold range of the passing zero trigger time,
Wherein, less than the described second default trigger signal, described second presets the described first default trigger signal
Trigger signal is less than the described 3rd default trigger signal.
The determination method of zero ON time according to an embodiment of the invention, by detecting sampled signal and the
One default trigger signal and the second default trigger signal and magnitude relationship with the 3rd trigger signal,
The scope of passing zero trigger time is determined, so as to improve the reliability of IGBT, makes it as many as possible
Work in passing zero trigger state, and then saved power consumption, improve reliability, wherein, first is pre-
If trigger signal corresponds to advanced Continuity signal, the second default trigger signal corresponds to passing zero trigger signal,
3rd default trigger signal corresponds to delayed Continuity signal.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the time length that preceding thyristor switch is opened,
The intensity of LC (coil panel and resonant capacitance) loop power is determined, energy intensity determines LC concussions
Wave amplitude, and then V can be predictedCEThe voltage change amplitude of (voltage between colelctor electrode and emitter stage), closes
The V of IGCT when the IGCT LC (coil panel and resonant capacitance) that has no progeny shakes naturallyCE(colelctor electrode and hair
Voltage between emitter-base bandgap grading) voltage follow fluctuation, wherein, VCEAmplitude it is larger, and the sampled signal of base stage
With VCEPositive correlation, therefore, using the sampled signal of base stage as the foundation for judging passing zero trigger, reduce
Detection range, improves the reliability of detection process.
Wherein, it is by obtaining the sampled signal of the base stage of thyristor switch and the sampled signal of gained is defeated
Enter AD conversion module (D/A converter module) that single-chip microcomputer carries or first pass through AD conversion chip and again will
Gained signal input realizes the conversion between analog signal and data signal, and will obtain to single-chip microcomputer
Data signal indirect assignment to program so that single-chip microcomputer can be quickly determined that with the presence or absence of passing zero trigger
The electric signal of point, i.e. trigger point from null value or negative value be changed on the occasion of when point, single-chip microcomputer is by recognizing zero passage
Turn on this point, and the self-resonance voltage after shut-off is compared with the reference voltage of setting, allow monolithic
Machine judges and is automatically found the optimal passing zero trigger time of thyristor switch.
In addition, the determination method of the passing zero trigger time provided according to the above embodiment of the present invention, also has
Following additional technical feature：
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, according to institute
The magnitude relationship of trigger signal and the first default trigger signal is stated, the sampled signal and second are preset and touch
The magnitude relationship of signalling, and the magnitude relationship that the sampled signal presets trigger signal with the 3rd,
Determine the threshold range of the passing zero trigger time, including step in detail below：It is determined that the triggering
Signal presets trigger signal more than or equal to described first, and during less than the described second default trigger signal,
The trigger signal is judged to the first trigger signal, the moment of first trigger signal is recorded, with
Using the moment of first trigger signal as the threshold range lower limit.
The determination method of passing zero trigger time, touches by the way that judgement first is default according to an embodiment of the invention
Signal, it is determined that the lower limit of passing zero trigger time, improve the passing zero trigger time to IGBT
Control, and then reduce power consumption.
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, root
According to the magnitude relationship of the trigger signal and the first default trigger signal, the sampled signal and second pre-
If the magnitude relationship of trigger signal, and the sampled signal is closed with the size of the 3rd default trigger signal
System, determines the threshold range of the passing zero trigger time, also including step in detail below：It is determined that institute
Trigger signal is stated more than or equal to the described second default trigger signal, and less than the described 3rd default triggering
During signal, the trigger signal is judged to the second trigger signal, records second trigger signal
Duration, using the duration of second trigger signal as passing zero trigger time reference value.
The determination method of passing zero trigger time, touches by the way that judgement second is default according to an embodiment of the invention
Signal, it is determined that a reference value of passing zero trigger time, further increasing the zero passage to IGBT
The control of ON time, create a further reduction power consumption.
According to one embodiment of present invention, it is preferable that when judging to produce the trigger signal, root
According to the magnitude relationship of the trigger signal and the first default trigger signal, the sampled signal and second pre-
If the magnitude relationship of trigger signal, and the sampled signal is closed with the size of the 3rd default trigger signal
System, determines the threshold range of the passing zero trigger time, also including step in detail below：It is determined that institute
Trigger signal is stated more than or equal to the described 3rd default trigger signal, the trigger signal is judged to the
Three trigger signals, record the moment of the 3rd trigger signal, by the 3rd trigger signal when
Carve as the higher limit of the threshold range.
The determination method of passing zero trigger time, touches by the way that judgement the 3rd is default according to an embodiment of the invention
Signal, it is determined that the higher limit of passing zero trigger time, further increasing the zero passage to IGBT
The control of ON time, further reduces power consumption.
According to one embodiment of present invention, it is preferable that judged whether to produce according to the sampled signal
Trigger signal, including step in detail below：When judging not producing the trigger signal, increase electricity is negative
The dutycycle of information carrying number, and the electric loading signal of dutycycle as the electricity of the specified dutycycle will be increased
Load signal.
The determination method of passing zero trigger time according to an embodiment of the invention, by being not detected by triggering
During signal, the dutycycle of electric loading signal is improved, namely improve the power for putting on IGBT, so that plus
The fast efficiency for determining the passing zero trigger time, wherein, the raising of dutycycle can be according to default step value,
Or tested according to default power curve, untill trigger signal is produced.
Fig. 2 shows the signal of the determination system of passing zero trigger time according to an embodiment of the invention
Block diagram.
As shown in Fig. 2 the determination system 200 of passing zero trigger time according to embodiments of the present invention, including：
Acquiring unit 202, for the colelctor electrode apply specify dutycycle electric loading signal after it is specified when
It is interior, obtain the sampled signal of the colelctor electrode；Judging unit 204, for being sentenced according to the sampled signal
It is disconnected whether to produce trigger signal；Determining unit 206, for judge produce the trigger signal when, according to
The magnitude relationship that the trigger signal presets trigger signal with first, the sampled signal and the second default triggering
The magnitude relationship of signal, and the sampled signal and the magnitude relationship of the 3rd default trigger signal, determine institute
The threshold range of passing zero trigger time is stated, wherein, the described first default trigger signal is preset less than described second
Trigger signal, the described second default trigger signal is less than the described 3rd default trigger signal.
The determination system of passing zero trigger time according to an embodiment of the invention, by detecting sampled signal and the
One default trigger signal and the second default trigger signal and magnitude relationship with the 3rd trigger signal, really
The scope of passing zero trigger time is determined, so as to improve the reliability of IGBT, it is worked as much as possible
In passing zero trigger state, and then power consumption is saved, improved reliability, wherein, the first default trigger signal
Corresponding to advanced Continuity signal, the second default trigger signal corresponds to passing zero trigger signal, the 3rd default triggering
Signal corresponds to delayed Continuity signal.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the time length that preceding thyristor switch is opened,
The intensity of LC (coil panel and resonant capacitance) loop power is determined, energy intensity determines LC concussions
Wave amplitude, and then the voltage change amplitude of VCE (voltage between colelctor electrode and emitter stage) can be predicted,
When IGCT LC (coil panel and resonant capacitance) shakes naturally after shut-off IGCT VCE (colelctor electrode with
Voltage between emitter stage) voltage follow fluctuation, wherein, the amplitude of VCE is larger, and the sampling of base stage
Signal and VCE positive correlations, therefore, using the sampled signal of base stage as the foundation for judging passing zero trigger,
Detection range is reduced, the reliability of detection process is improve.
Wherein, it is by obtaining the sampled signal of the base stage of thyristor switch and the sampled signal of gained is defeated
Enter AD conversion module (D/A converter module) that single-chip microcomputer carries or first pass through AD conversion chip and again will
Gained signal input realizes the conversion between analog signal and data signal, and will obtain to single-chip microcomputer
Data signal indirect assignment to program so that single-chip microcomputer can be quickly determined that with the presence or absence of passing zero trigger
The electric signal of point, i.e. trigger point from null value or negative value be changed on the occasion of when point, single-chip microcomputer is by recognizing zero passage
Turn on this point, and the self-resonance voltage after shut-off is compared with the reference voltage of setting, allow monolithic
Machine judges and is automatically found the optimal passing zero trigger time of thyristor switch.
According to one embodiment of present invention, it is preferable that the determining unit 206：Recording unit 2062,
For it is determined that the trigger signal is more than or equal to the described first default trigger signal, and less than described second
During default trigger signal, the trigger signal is judged to the first trigger signal, records the first triggering letter
Number moment, using the moment of first trigger signal as the threshold range lower limit.
The determination system of passing zero trigger time, triggering is preset by judging first according to an embodiment of the invention
Signal, it is determined that the lower limit of passing zero trigger time, improves the control to the passing zero trigger time of IGBT,
And then reduce power consumption.
According to one embodiment of present invention, it is preferable that the recording unit 2062 is additionally operable to, it is determined that
The trigger signal is believed more than or equal to the described second default trigger signal less than the described 3rd default triggering
Number when, the trigger signal is judged to the second trigger signal, record second trigger signal it is lasting when
Between, using the duration of second trigger signal as passing zero trigger time reference value.
The determination system of passing zero trigger time, triggering is preset by judging second according to an embodiment of the invention
Signal, it is determined that a reference value of passing zero trigger time, when further increasing the passing zero trigger to IGBT
Between control, create a further reduction power consumption.
According to one embodiment of present invention, it is preferable that the recording unit 2062 is additionally operable to, it is determined that
The trigger signal is judged to the 3rd by the trigger signal more than or equal to the described 3rd default trigger signal
Trigger signal, records the moment of the 3rd trigger signal, using the moment of the 3rd trigger signal as
The higher limit of the threshold range.
The determination system of passing zero trigger time, triggering is preset by judging the 3rd according to an embodiment of the invention
Signal, it is determined that the higher limit of passing zero trigger time, when further increasing the passing zero trigger to IGBT
Between control, further reduce power consumption.
According to one embodiment of present invention, it is preferable that also include：Increase unit 208, for judging
When not producing the trigger signal, increase the dutycycle of electric loading signal, and the electric loading of dutycycle will be increased
Signal as the specified dutycycle electric loading signal.
The determination system of passing zero trigger time according to an embodiment of the invention, by being not detected by triggering letter
Number when, improve the dutycycle of electric loading signal, namely the power for putting on IGBT is improve, so as to accelerate
Determine the efficiency of passing zero trigger time, wherein, the raising of dutycycle can be according to default step value, or
Person is tested according to default power curve, untill trigger signal is produced.
Fig. 3 shows the structured flowchart of electromagnetic heater according to an embodiment of the invention.
As shown in figure 3, electromagnetic heater according to an embodiment of the invention 300, including：As above
State the determination system 200 of the passing zero trigger time described in any one technical scheme.
Fig. 4 shows the signal of the control method of electromagnetic heater according to an embodiment of the invention
Flow chart.
As shown in figure 4, the control method of electromagnetic heater according to an embodiment of the invention,
Including：Step 402, sentences a pot program；Step 404, initial laser heating (minimum PPG values)；Step
Rapid 406, shut-off makes its self-oscillation after work 5ms (in power-frequency voltage crest)；Step 408, PPG
Extension certain value；Step 410, determines whether that the first trigger signal is produced, if so, then performing step
416, if not (as shown in Figure 5), then perform step 408；Step 412, determines whether second
Trigger signal is produced, if so, then performing step 418, if not (as shown in Figure 5), then performs step
408；Step 414, determines whether that the first trigger signal is produced, if so, step 420 is then performed,
If not (as shown in Figure 5), then step 408 is performed；Step 422, determines the threshold of passing zero trigger time
Value scope；Step 424, according to passing zero trigger reference voltage and threshold range, is driven to IGBT.
Specifically, in step 404, control electromagnetic heater is heated under the default heat time,
Electromagnetic heater enters self-resonance state, namely above-mentioned self-oscillation state after heating terminates, from
Resonance potential starts constantly to reduce with the growth of self-resonance time, so that entering when being less than reference voltage
The row time records, (the relatively long shut-offs of IGBT) LC (coil panel and resonance after being shut down using magnetic stove
Electric capacity) V of IGBT when shakingCEThe principle of voltage follow fluctuation is realized.IGBT is open-minded before shut-off
Time length, determine the intensity of LC loop powers, energy intensity determines the wave amplitude of LC concussions, enters
And VCEAmplitude of variation it is also contemplated that.After IGBT opens duration and reaches to a certain degree before shut-off,
VCEVoltage pulsation it is minimum to a certain extent after, IGBT present passing zero trigger, can also produce such as Fig. 6
Shown trigger signal 1, and IGBT is advanced conducting before, it is certainly low again that delayed leading just occurs
It is logical, between recording at the beginning of trigger signal 1 to self-oscillation state, with this determination benchmark heat time, if
It is decreased to during zero in the self-resonance voltage of IGBT, trigger signal 1 does not occur, then control increase
The dutycycle and real-time testing of PPG whether there is trigger signal 1.Electromagnetic Heating control of the invention
Scheme seeks to allow single-chip microcomputer to recognize passing zero trigger this point, and record that now IGBT opens when
Between, wherein, the combination of different coil panel, resonant capacitance, disk spacing and pan leads IGBT zero passages
The time that IGBT is opened when logical is different.
Technical scheme is described in detail above in association with accompanying drawing, it is contemplated that how to determine IGBT's
The technical problem of the heating mode of passing zero trigger time and then the different pans of determination, the present invention proposes one kind
The determination method of passing zero trigger time, a kind of determination system of passing zero trigger time and a kind of Electromagnetic Heating
Device causes electromagnetic oven, is touched by detecting that sampled signal is default with the first default trigger signal and second
Signal and the magnitude relationship with the 3rd trigger signal, it is determined that the scope of passing zero trigger time,
So as to improve the reliability of IGBT, it is set to work in passing zero trigger state as much as possible, and then
Power consumption has been saved, reliability has been improved, wherein, the first default trigger signal corresponds to super preamble communication
Number, the second default trigger signal corresponds to passing zero trigger signal, and the 3rd default trigger signal corresponds to stagnant
Continuity signal afterwards.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for this
For the technical staff in field, the present invention can have various modifications and variations.It is all in spirit of the invention and former
Within then, any modification, equivalent substitution and improvements made etc. should be included in protection scope of the present invention
Within.
Claims (11)
1. a kind of determination method of passing zero trigger time, it is adaptable to which thyristor switch, the IGCT is opened
Pass includes emitter stage, colelctor electrode and base stage, it is characterised in that the determination side of the passing zero trigger time
Method includes：
The colelctor electrode is being applied to specify in the specified time after the electric loading signal of dutycycle, is being obtained
The sampled signal of the colelctor electrode；
Judged whether to produce trigger signal according to the sampled signal；
When judging to produce the trigger signal, according to the trigger signal and the first default trigger signal
Magnitude relationship, the magnitude relationship of the sampled signal and the second default trigger signal, and described adopt
The magnitude relationship of sample signal and the 3rd default trigger signal, determines the threshold value model of the passing zero trigger time
Enclose,
Wherein, the described first default trigger signal is less than the described second default trigger signal, described second
Default trigger signal is less than the described 3rd default trigger signal.
2. the determination method of passing zero trigger time according to claim 1, it is characterised in that
When judging to produce the trigger signal, according to the size that the trigger signal presets trigger signal with first
The magnitude relationship of relation, the sampled signal and the second default trigger signal, and the sampled signal
With the magnitude relationship of the 3rd default trigger signal, the threshold range of the passing zero trigger time is determined, wrap
Include step in detail below：
It is determined that the trigger signal is more than or equal to the described first default trigger signal, and less than described
During the second default trigger signal, the trigger signal is judged to the first trigger signal, records described the
The moment of one trigger signal, using the moment of first trigger signal as under the threshold range
Limit value.
3. the determination method of passing zero trigger time according to claim 1, it is characterised in that
When judging to produce the trigger signal, according to the size that the trigger signal presets trigger signal with first
The magnitude relationship of relation, the sampled signal and the second default trigger signal, and the sampled signal
With the magnitude relationship of the 3rd default trigger signal, the threshold range of the passing zero trigger time is determined, also
Including step in detail below：
It is determined that the trigger signal is more than or equal to the described second default trigger signal, and less than described
During the 3rd default trigger signal, the trigger signal is judged to the second trigger signal, records described the
The duration of two trigger signals, using the duration of second trigger signal as passing zero trigger
Time reference value.
4. the determination method of passing zero trigger time according to claim 3, it is characterised in that
When judging to produce the trigger signal, according to the size that the trigger signal presets trigger signal with first
The magnitude relationship of relation, the sampled signal and the second default trigger signal, and the sampled signal
With the magnitude relationship of the 3rd default trigger signal, the threshold range of the passing zero trigger time is determined, also
Including step in detail below：
It is determined that the trigger signal is more than or equal to the described 3rd default trigger signal, by the triggering
Signal determining is the 3rd trigger signal, the moment of the 3rd trigger signal is recorded, by the described 3rd
The moment of trigger signal as the threshold range higher limit.
5. the determination method of passing zero trigger time according to any one of claim 1 to 4, its
It is characterised by, is judged whether to produce trigger signal, including step in detail below according to the sampled signal：
When judging not producing the trigger signal, increase the dutycycle of electric loading signal, and will increase
The electric loading signal of dutycycle as the specified dutycycle electric loading signal.
6. a kind of determination system of passing zero trigger time, it is adaptable to which thyristor switch, the IGCT is opened
Pass includes emitter stage, colelctor electrode and base stage, it is characterised in that the determination system of the passing zero trigger time
System includes：
Acquiring unit, for applying to specify the finger after the electric loading signal of dutycycle to the colelctor electrode
In fixing time, the sampled signal of the colelctor electrode is obtained；
Judging unit, for being judged whether to produce trigger signal according to the sampled signal；
Determining unit, for when judging to produce the trigger signal, according to the trigger signal and the
The magnitude relationship of one default trigger signal, the sampled signal is closed with the size of the second default trigger signal
System, and the sampled signal and the magnitude relationship of the 3rd default trigger signal, determine that the zero passage is led
The threshold range of logical time,
Wherein, the described first default trigger signal is less than the described second default trigger signal, described second
Default trigger signal is less than the described 3rd default trigger signal.
7. the determination system of passing zero trigger time according to claim 6, it is characterised in that institute
Stating determining unit also includes：
Recording unit, for it is determined that the trigger signal is more than or equal to the described first default triggering letter
Number, and during less than the described second default trigger signal, the trigger signal is judged to that the first triggering is believed
Number, the moment of first trigger signal is recorded, using the moment of first trigger signal as institute
State the lower limit of threshold range.
8. the determination system of passing zero trigger time according to claim 6, it is characterised in that institute
State recording unit to be additionally operable to, it is determined that the trigger signal is more than or equal to the described second default triggering letter
Number, and during less than the described 3rd default trigger signal, the trigger signal is judged to that the second triggering is believed
Number, record the duration of second trigger signal, by second trigger signal it is lasting when
Between as passing zero trigger time reference value.
9. the determination system of passing zero trigger time according to claim 8, it is characterised in that institute
State recording unit to be additionally operable to, it is determined that the trigger signal is more than or equal to the described 3rd default triggering letter
Number, the trigger signal is judged to the 3rd trigger signal, the moment of the 3rd trigger signal is recorded,
Using by the moment of the 3rd trigger signal as the threshold range higher limit.
10. the determination system of the passing zero trigger time according to any one of claim 6 to 9,
Characterized in that, also including：
Increase unit, for when judging not producing the trigger signal, increasing accounting for for electric loading signal
Sky ratio, and the electric loading signal of dutycycle as the electric loading signal of the specified dutycycle will be increased.
A kind of 11. electromagnetic heaters, it is characterised in that including：As appointed in claim 6 to 10
The determination system of the passing zero trigger time described in one.
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| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
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