CN106413161B - The IGBT driving method and electromagnetic heater of electromagnetic heater - Google Patents
The IGBT driving method and electromagnetic heater of electromagnetic heater Download PDFInfo
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- CN106413161B CN106413161B CN201510484197.5A CN201510484197A CN106413161B CN 106413161 B CN106413161 B CN 106413161B CN 201510484197 A CN201510484197 A CN 201510484197A CN 106413161 B CN106413161 B CN 106413161B
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Abstract
The present invention provides a kind of driving method, drive system and electromagnetic heaters, wherein driving method, comprising: within the specified time after the electric loading signal for applying specified duty ratio to the base stage, obtains the sampled signal of collector；Passing zero trigger signal is judged whether there is according to sampled signal to occur；When determining passing zero trigger signal occur, the duration of passing zero trigger signal is determined；After determining duration and accordingly specified duty ratio, the different driving signal of at least two duty ratio of superposition processing, to generate mixing driving signal, specified duty ratio is within the duty cycle range that at least two duty ratios determine；Mixing driving signal is applied to base stage, to work in multiple assigned work modes with driving IGBT periodic cycle, multiple assigned work modes include advanced ON operation mode, passing zero trigger operating mode and lag ON operation mode.Technical solution through the invention improves cooking efficiency, and the user experience is improved.
Description
Technical field
The present invention relates to fields of home appliance technology, more specifically, are related to a kind of IGBT driving of electromagnetic heater
Method and a kind of electromagnetic heater.
Background technique
In the related art, existing electromagnetic oven IGBT (Insulated Gate Bipolar Transistor, insulated gate
Bipolar junction transistor) drive scheme be all to be solidificated in the program of controller, the type of cookware is determined by sentencing pot program,
It is heated when opening electromagnetic oven and being worked by the drive scheme found in program of tabling look-up with controlling electromagnetic oven.For normal
With and parameter do not have matching that changed cookware usually can be relatively good it correspond to the working time under power, but for seldom
The material parameters of the material parameters of the cookware used and general cookware have relatively large deviation, then difficult to pass through the drive obtained in program of tabling look-up
Dynamic scheme, causes cookware that cannot be compatible with well, causes output power deviation to compare larger, product reliability is poor.
Therefore, how to determine the passing zero trigger time of IGBT and then determine that the heating mode of different cookwares becomes urgently to be resolved
The technical issues of.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.
For this purpose, it is an object of the present invention to proposing a kind of IGBT driving method of new electromagnetic heater.
It is another object of the present invention to propose a kind of electromagnetic heater.
To achieve the above object, according to the embodiment of the first aspect of the invention, a kind of electromagnetic heater is proposed
IGBT driving method, the IGBT include emitter, collector and base stage, and the driving method includes: to apply to the base stage
In specified time after adding the electric loading signal of specified duty ratio, the sampled signal of the collector is obtained；According to the sampling
Signal judges whether there is the appearance of passing zero trigger signal；When determining to occur the passing zero trigger signal, the passing zero trigger is determined
The duration of signal；After determining the duration and the corresponding specified duty ratio, superposition processing at least two is accounted for
Sky is than different driving signal, to generate mixing driving signal, wherein the specified duty ratio is in described at least two and accounts for
Sky than determining duty cycle range within；The mixing driving signal is applied to the base stage, to drive the IGBT period
Property cyclically works in multiple assigned work modes, and the multiple assigned work mode includes advanced ON operation mode, zero passage
ON operation mode and lag ON operation mode.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the way that mixing voltages are applied to base
Pole keeps IGBT cycle operation a variety of in advanced ON operation mode, passing zero trigger operating mode and lag ON operation mode etc.
Operating mode releases the inner accumulation stress of IGBT, improves damage accumulation, reduces failure rate.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding IGBT is opened determines LC (line
Enclose disk and resonant capacitance) intensity of loop power, energy intensity determines the wave amplitude of LC concussion, and then can predict VCE(collector
Voltage between emitter) voltage change amplitude, when thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristorCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collector
Sampled signal and VCEIt is positively correlated, therefore, using the sampled signal of collector as the foundation for judging passing zero trigger, reduces inspection
Journey is measured, the reliability of detection process is improved.
Wherein, by obtaining the sampled signal of the collector of IGBT, and certainly by resulting sampled signal input single-chip microcontroller
The AD conversion module (D/A converter module) of band first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, realizes
Conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that single-chip microcontroller
It can quickly determine that with the presence or absence of passing zero trigger point, i.e., when the electric signal of trigger point becomes positive value from zero or negative value
Point, single-chip microcontroller are carried out by identification this point of passing zero trigger, and by the self-resonance voltage after shutdown and the reference voltage of setting
Compare, single-chip microcontroller is allowed to judge and is automatically found the optimal passing zero trigger time of IGBT.
In addition, the IGBT driving method of the electromagnetic heater provided according to that above embodiment of the present invention, also has as follows
Additional technical feature:
According to one embodiment of present invention, it is preferable that in the electric loading signal for applying specified duty ratio to the base stage
In specified time afterwards, the sampled signal of the collector is obtained, comprising the following specific steps applying the electricity to the base stage
After load signal, within the specified time for stopping applying the electric loading signal, the signal of the collector is acquired, to the collection
The signal of electrode carries out digital-to-analogue conversion processing, to obtain the sampled signal.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the stopping pair of electric loading signal
Collector signal is acquired in specified time after base stage power supply, detection range is reduced, improves the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of IGBT, and resulting sampled signal is inputted into single-chip microcontroller
Included AD conversion module (D/A converter module) first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, will
Obtained digital signal indirect assignment enables single-chip microcontroller to judge there are passing zero trigger point, that is, the voltage triggered to program
To point when becoming positive value from zero, the passing zero trigger time may thereby determine that.
According to one embodiment of present invention, it is preferable that passing zero trigger signal is judged whether there is according to the sampled signal
Occur, comprising the following specific steps judging whether the sampled signal is greater than or equal to preset reference signal；It adopts described in the judgement
When sample signal is greater than or equal to the preset reference signal, determining has the passing zero trigger signal to occur.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by judging whether sampled signal is big
In or be equal to preset reference signal, with determine passing zero trigger signal occur, realize and rapidly judge and be automatically found IGBT's
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetic heating
The matching process of device and the heating mode of different cookwares, reduces power consumption.
According to one embodiment of present invention, it is preferable that judge whether the sampled signal is greater than or equal to preset reference
Signal, comprising the following specific steps determining when determining that the sampled signal is less than the preset reference signal without the zero passage
Continuity signal occurs.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by being set in judgement sampled signal
It when less than preset reference signal, determines and occurs without passing zero trigger signal, further assured that the determining passing zero trigger time can
By property and accuracy, meanwhile, convenient for improving the efficiency of detection passing zero trigger signal.
According to one embodiment of present invention, it is preferable that also include the following specific steps: determining not generating the zero passage
When Continuity signal, increase the duty ratio of electric loading signal, and the electric loading signal of duty ratio will be increased as the specified duty
The electric loading signal of ratio.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the way that passing zero trigger is being not detected
When signal triggers, the duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, was determined to accelerate
The efficiency of zero turn-on time, wherein the raising of duty ratio can be according to default step value, or according to preset power curve
It is tested, until generating the triggering of passing zero trigger signal.
Embodiment according to a second aspect of the present invention, it is also proposed that a kind of electromagnetic heater, including IGBT, the IGBT
Including emitter, collector and base stage, the electromagnetic heater further include: acquiring unit, for applying to the base stage
In specified time after the electric loading signal of specified duty ratio, the sampled signal of the collector is obtained；Judging unit is used for root
Passing zero trigger signal is judged whether there is according to the sampled signal to occur；Determination unit, for determining the passing zero trigger occur
When signal, the duration of the passing zero trigger signal is determined；Superpositing unit, for determining duration and corresponding
After the specified duty ratio, the different driving signal of at least two duty ratio of superposition processing, to generate mixing driving signal,
In, the specified duty ratio is within the duty cycle range that at least two duty ratio determines；Driving unit is used for institute
It states mixing driving signal and is applied to the base stage, to work in multiple assigned work moulds with driving the IGBT periodic cycle
Formula, the multiple assigned work mode include advanced ON operation mode, passing zero trigger operating mode and lag ON operation mould
Formula.
The electromagnetic heater of embodiment according to the present invention recycles IGBT by the way that mixing voltages are applied to base stage
Work in the multiple-working modes such as advanced ON operation mode, passing zero trigger operating mode and lag ON operation mode, release
The inner accumulation stress of IGBT improves damage accumulation, reduces failure rate.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that IGBT is opened determines LC (coil
Disk and resonant capacitance) loop power intensity, energy intensity determines the wave amplitude of LC concussion, and then can predict VCE(collector with
Voltage between emitter) voltage change amplitude, it is brilliant when thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of brake tubeCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collector
Sampled signal and VCEIt is positively correlated, therefore, using the sampled signal of collector as the foundation for judging passing zero trigger, reduces detection
Range improves the reliability of detection process.
Wherein, by obtaining the sampled signal of the collector of IGBT, and certainly by resulting sampled signal input single-chip microcontroller
The AD conversion module (D/A converter module) of band first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, realizes
Conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that single-chip microcontroller
It can quickly determine that with the presence or absence of passing zero trigger point, i.e., when the electric signal of trigger point becomes positive value from zero or negative value
Point, single-chip microcontroller are carried out by identification this point of passing zero trigger, and by the self-resonance voltage after shutdown and the reference voltage of setting
Compare, single-chip microcontroller is allowed to judge and is automatically found the optimal passing zero trigger time of IGBT.
According to one embodiment of present invention, it is preferable that the acquiring unit further include: acquisition unit, for described
After base stage applies the electric loading signal, within the specified time for stopping applying the electric loading signal, the collector is acquired
Signal, digital-to-analogue conversion processing is carried out to the signal of the collector, to obtain the sampled signal.
The electromagnetic heater of embodiment according to the present invention, by stopping in electric loading signal to the finger after base stage power supply
It fixes time interior acquisition collector signal, reduces detection range, improve the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of IGBT, and resulting sampled signal is inputted into single-chip microcontroller
Included AD conversion module (D/A converter module) first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, will
Obtained digital signal indirect assignment enables single-chip microcontroller to judge there are passing zero trigger point, that is, the voltage triggered to program
To point when becoming positive value from zero, the passing zero trigger time may thereby determine that.
According to one embodiment of present invention, it is preferable that the judging unit is also used to, and whether judges the sampled signal
More than or equal to preset reference signal；The determination unit is also used to, and is determining that it is described pre- that the sampled signal is greater than or equal to
If when reference signal, determining has the passing zero trigger signal to occur.
The electromagnetic heater of embodiment according to the present invention, by judging whether sampled signal is greater than or equal to default base
Calibration signal realizes the optimal passing zero trigger for rapidly judging and being automatically found IGBT to determine that passing zero trigger signal occurs
Time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetic heater and different cookwares
Heating mode matching process, reduce power consumption.
According to one embodiment of present invention, it is preferable that the determination unit is also used to, and is determining that the sampled signal is small
When the preset reference signal, determines and occur without the passing zero trigger signal.
The electromagnetic heater of embodiment according to the present invention determines that sampled signal is believed less than preset reference by being set in
Number when, determine without passing zero trigger signal occur, further assured that the reliability and accuracy of determining passing zero trigger time, together
When, convenient for improving the efficiency of detection passing zero trigger signal.
According to one embodiment of present invention, it is preferable that further include: increasing unit, for determining not generating the mistake
When zero Continuity signal, increase the duty ratio of electric loading signal, and account for the electric loading signal for increasing duty ratio as described specify
The electric loading signal of empty ratio.
The electromagnetic heater of embodiment according to the present invention, by mentioning when the triggering of passing zero trigger signal is not detected
The duty ratio of high electric loading signal, namely the power for being applied to IGBT is improved, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to default step value, or be tested according to preset power curve, directly
Until generating the triggering of passing zero trigger signal.
A kind of electromagnetic heater proposed by the present invention, can be electromagnetic oven, be also possible to electromagnetic heating rice cooker or electromagnetism
The electromagnetic heatings cooker such as heated pressure pot.
Additional aspect and advantage according to the present invention will provide in following description section, partially will be from following description
In become obvious, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the exemplary flow of the IGBT driving method of electromagnetic heater according to an embodiment of the invention
Figure；
Fig. 2 shows the schematic block diagrams of electromagnetic heater according to an embodiment of the invention；
Fig. 3 shows the schematic flow diagram of the control method of electromagnetic heater according to an embodiment of the invention；
Fig. 4 shows the real-time testing figure of electromagnetic heating control according to an embodiment of the invention；
Fig. 5 shows the real-time testing figure of the control of electromagnetic heating according to another embodiment of the invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implement in a manner of using other than the one described here, therefore, protection scope of the present invention is not by following public tool
The limitation of body embodiment.
Fig. 1 shows the exemplary flow of the IGBT driving method of electromagnetic heater according to an embodiment of the invention
Figure.
As shown in Figure 1, the IGBT driving method of electromagnetic heater according to an embodiment of the present invention, the IGBT includes hair
Emitter-base bandgap grading, collector and base stage, the driving method include: step 102, in the electric loading for applying specified duty ratio to the base stage
In specified time after signal, the sampled signal of the collector is obtained；Step 104, judged whether according to the sampled signal
There is the appearance of passing zero trigger signal；Step 106, when determining to occur the passing zero trigger signal, the passing zero trigger signal is determined
Duration；Step 108, after determining the duration and the corresponding specified duty ratio, superposition processing at least two
The kind different driving signal of duty ratio, to generate mixing driving signal, wherein the specified duty ratio is in described at least two
Within the duty cycle range that kind duty ratio determines；Step 110, the mixing driving signal is applied to the base stage, with driving
Multiple assigned work modes are worked in the IGBT periodic cycle, the multiple assigned work mode includes advanced conducting work
Operation mode, passing zero trigger operating mode and lag ON operation mode.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the way that mixing voltages are applied to base
Pole keeps IGBT cycle operation a variety of in advanced ON operation mode, passing zero trigger operating mode and lag ON operation mode etc.
Operating mode releases the inner accumulation stress of IGBT, improves damage accumulation, reduces failure rate.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that IGBT is opened determines LC (coil
Disk and resonant capacitance) loop power intensity, energy intensity determines the wave amplitude of LC concussion, and then can predict VCE(collector with
Voltage between emitter) voltage change amplitude, it is brilliant when thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of brake tubeCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collector
Sampled signal and VCEIt is positively correlated, therefore, using the sampled signal of collector as the foundation for judging passing zero trigger, reduces detection
Range improves the reliability of detection process.
Wherein, by obtaining the sampled signal of the collector of IGBT, and certainly by resulting sampled signal input single-chip microcontroller
The AD conversion module (D/A converter module) of band first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, realizes
Conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that single-chip microcontroller
It can quickly determine that with the presence or absence of passing zero trigger point, i.e., when the electric signal of trigger point becomes positive value from zero or negative value
Point, single-chip microcontroller are carried out by identification this point of passing zero trigger, and by the self-resonance voltage after shutdown and the reference voltage of setting
Compare, single-chip microcontroller is allowed to judge and is automatically found the optimal passing zero trigger time of IGBT.
In addition, the IGBT driving method of the electromagnetic heater provided according to that above embodiment of the present invention, also has as follows
Additional technical feature:
According to one embodiment of present invention, it is preferable that in the electric loading signal for applying specified duty ratio to the base stage
In specified time afterwards, the sampled signal of the collector is obtained, comprising the following specific steps applying the electricity to the base stage
After load signal, within the specified time for stopping applying the electric loading signal, the signal of the collector is acquired, to the collection
The signal of electrode carries out digital-to-analogue conversion processing, to obtain the sampled signal.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the stopping pair of electric loading signal
Collector signal is acquired in specified time after base stage power supply, detection range is reduced, improves the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of IGBT, and resulting sampled signal is inputted into single-chip microcontroller
Included AD conversion module (D/A converter module) first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, will
Obtained digital signal indirect assignment enables single-chip microcontroller to judge there are passing zero trigger point, that is, the voltage triggered to program
To point when becoming positive value from zero, the passing zero trigger time may thereby determine that.
According to one embodiment of present invention, it is preferable that passing zero trigger signal is judged whether there is according to the sampled signal
Occur, comprising the following specific steps judging whether the sampled signal is greater than or equal to preset reference signal；It adopts described in the judgement
When sample signal is greater than or equal to the preset reference signal, determining has the passing zero trigger signal to occur.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by judging whether sampled signal is big
In or be equal to preset reference signal, with determine passing zero trigger signal occur, realize and rapidly judge and be automatically found IGBT's
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetic heating
The matching process of device and the heating mode of different cookwares, reduces power consumption.
According to one embodiment of present invention, it is preferable that judge whether the sampled signal is greater than or equal to preset reference
Signal, comprising the following specific steps determining when determining that the sampled signal is less than the preset reference signal without the zero passage
Continuity signal occurs.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by being set in judgement sampled signal
It when less than preset reference signal, determines and occurs without passing zero trigger signal, further assured that the determining passing zero trigger time can
By property and accuracy, meanwhile, convenient for improving the efficiency of detection passing zero trigger signal.
According to one embodiment of present invention, it is preferable that also include the following specific steps: determining not generating the zero passage
When Continuity signal, increase the duty ratio of electric loading signal, and the electric loading signal of duty ratio will be increased as the specified duty
The electric loading signal of ratio.
The IGBT driving method of the electromagnetic heater of embodiment according to the present invention, by the way that passing zero trigger is being not detected
When signal triggers, the duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, was determined to accelerate
The efficiency of zero turn-on time, wherein the raising of duty ratio can be according to default step value, or according to preset power curve
It is tested, until generating the triggering of passing zero trigger signal.
Fig. 2 shows the schematic block diagrams of electromagnetic heater according to an embodiment of the invention.
As shown in Fig. 2, electromagnetic heater 200 according to an embodiment of the present invention, including IGBT, the IGBT include transmitting
Pole, collector and base stage, the electromagnetic heater 200 further include: acquiring unit 202, for referring to base stage application
In specified time after determining the electric loading signal of duty ratio, the sampled signal of the collector is obtained；Judging unit 204, is used for
Passing zero trigger signal is judged whether there is according to the sampled signal to occur；Determination unit 206, for determining the zero passage occur
When Continuity signal, the duration of the passing zero trigger signal is determined；Superpositing unit 208, for determining the duration
After the corresponding specified duty ratio, the different driving signal of at least two duty ratio of superposition processing is driven with generating mixing
Dynamic signal, wherein the specified duty ratio is within the duty cycle range that at least two duty ratio determines；Driving unit
210, it is multiple to work in driving the IGBT periodic cycle for the mixing driving signal to be applied to the base stage
Assigned work mode, the multiple assigned work mode include advanced ON operation mode, passing zero trigger operating mode and lag
ON operation mode.
The electromagnetic heater of embodiment according to the present invention recycles IGBT by the way that mixing voltages are applied to base stage
Work in the multiple-working modes such as advanced ON operation mode, passing zero trigger operating mode and lag ON operation mode, release
The inner accumulation stress of IGBT improves damage accumulation, reduces failure rate.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding IGBT is opened determines LC (line
Enclose disk and resonant capacitance) intensity of loop power, energy intensity determines the wave amplitude of LC concussion, and then can predict VCE(collector
Voltage between emitter) voltage change amplitude, when thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristorCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collector
Sampled signal and VCEIt is positively correlated, therefore, using the sampled signal of collector as the foundation for judging passing zero trigger, reduces inspection
Journey is measured, the reliability of detection process is improved.
Wherein, by obtaining the sampled signal of the collector of IGBT, and certainly by resulting sampled signal input single-chip microcontroller
The AD conversion module (D/A converter module) of band first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, realizes
Conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that single-chip microcontroller
It can quickly determine that with the presence or absence of passing zero trigger point, i.e., when the electric signal of trigger point becomes positive value from zero or negative value
Point, single-chip microcontroller are carried out by identification this point of passing zero trigger, and by the self-resonance voltage after shutdown and the reference voltage of setting
Compare, single-chip microcontroller is allowed to judge and is automatically found the optimal passing zero trigger time of IGBT.
According to one embodiment of present invention, it is preferable that the acquiring unit 202 further include: acquisition unit 2022 is used for
After applying the electric loading signal to the base stage, within the specified time for stopping applying the electric loading signal, described in acquisition
The signal of collector carries out digital-to-analogue conversion processing to the signal of the collector, to obtain the sampled signal.
The electromagnetic heater of embodiment according to the present invention, by stopping in electric loading signal to the finger after base stage power supply
It fixes time interior acquisition collector signal, reduces detection range, improve the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of IGBT, and resulting sampled signal is inputted into single-chip microcontroller
Included AD conversion module (D/A converter module) first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again, will
Obtained digital signal indirect assignment enables single-chip microcontroller to judge there are passing zero trigger point, that is, the voltage triggered to program
To point when becoming positive value from zero, the passing zero trigger time may thereby determine that.
According to one embodiment of present invention, it is preferable that the judging unit 204 is also used to, and judges the sampled signal
Whether preset reference signal is greater than or equal to；The determination unit is also used to, and is determining the sampled signal more than or equal to institute
When stating preset reference signal, determining has the passing zero trigger signal to occur.
The electromagnetic heater of embodiment according to the present invention, by judging whether sampled signal is greater than or equal to default base
Calibration signal realizes the optimal passing zero trigger for rapidly judging and being automatically found IGBT to determine that passing zero trigger signal occurs
Time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetic heater and different cookwares
Heating mode matching process, reduce power consumption.
According to one embodiment of present invention, it is preferable that the determination unit 206 is also used to, and is determining the sampling letter
Number be less than the preset reference signal when, determine without the passing zero trigger signal occur.
The electromagnetic heater of embodiment according to the present invention determines that sampled signal is believed less than preset reference by being set in
Number when, determine without passing zero trigger signal occur, further assured that the reliability and accuracy of determining passing zero trigger time, together
When, convenient for improving the efficiency of detection passing zero trigger signal.
According to one embodiment of present invention, it is preferable that further include: increasing unit 212, it is described for not generated in judgement
When passing zero trigger signal, increase the duty ratio of electric loading signal, and the electric loading signal of duty ratio will be increased as described specified
The electric loading signal of duty ratio.
The electromagnetic heater of embodiment according to the present invention, by mentioning when the triggering of passing zero trigger signal is not detected
The duty ratio of high electric loading signal, namely the power for being applied to IGBT is improved, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to default step value, or be tested according to preset power curve, directly
Until generating the triggering of passing zero trigger signal.
Fig. 3 shows the schematic flow diagram of the control method of electromagnetic heater according to an embodiment of the invention.
As shown in figure 3, the control method of electromagnetic heater according to an embodiment of the invention, comprising: step
402, N frequency driving signal, power P=(Um1+Um2+ ...+Umn)/(Im1+Im2 of N frequency driving signal are applied to collector
+ ...+Imn), wherein Umn-Imn signal is the waveform of periodic load, wherein by adjusting for Umn-Imn signal
It is whole, the accurate adjusting of the power P to N frequency driving signal can be fast implemented.
As shown in Figure 4 and Figure 5, specifically, control electromagnetic heater is heated under default heating time, is being heated
After electromagnetic heater enter self-resonance state namely above-mentioned self-oscillation state, self-resonance voltage start with self-resonance
The growth of time and constantly reduce so that be lower than reference voltage when carry out time record, using magnetic furnace shut down after (IGBT is opposite
For a long time turn off) LC (coil panel and resonant capacitance) from shake when IGBT VCEThe principle of voltage follow fluctuation is realized.Shutdown
The length of time that preceding IGBT is opened, determines the intensity of LC loop power, and energy intensity determines the wave amplitude of LC concussion, and then VCE's
Amplitude of variation it is also contemplated that.After the preceding IGBT of shutdown, which opens duration, to be reached a certain level, VCEVoltage fluctuation most as low as certain
After degree, passing zero trigger is presented in IGBT, can also generate trigger signal 1 as shown in Figure 5, and IGBT is to lead in advance before
Logical, the low lag that just will appear is connected again certainly, at the beginning of recording trigger signal 1 to self-oscillation state, determines benchmark with this
Heating time then controls if not occurring trigger signal 1 during the self-resonance voltage of IGBT is decreased to zero and increases PPG's
Simultaneously real-time testing whether there is trigger signal 1 to duty ratio.Electromagnetic heating control program according to the present invention seeks to allow single-chip microcontroller
It identifies this point of passing zero trigger, and records the time that IGBT at this time is opened, wherein between different coil panel, resonant capacitance, disk
Keep the time that IGBT is opened when IGBT passing zero trigger different away from the combination from cookware.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, it is contemplated that when how to determine the passing zero trigger of IGBT
Between so the technical issues of determine the heating mode of different cookwares, the invention proposes a kind of IGBT of electromagnetic heater drivings
Method and a kind of electromagnetic heater make IGBT cycle operation in conducting work in advance by the way that mixing voltages are applied to collector
The multiple-working modes such as operation mode, passing zero trigger operating mode and lag ON operation mode, release the inner accumulation of IGBT
Stress improves damage accumulation, reduces failure rate.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of IGBT driving method of electromagnetic heater, the IGBT include emitter, collector and base stage, feature exists
In the driving method includes:
Within the specified time after the electric loading signal for applying specified duty ratio to the base stage, the sampling of the collector is obtained
Signal；
Passing zero trigger signal is judged whether there is according to the sampled signal to occur；
When determining to occur the passing zero trigger signal, the duration of the passing zero trigger signal is determined；
After determining the duration and the corresponding specified duty ratio, at least two duty ratio of superposition processing is different
Driving signal, to generate mixing driving signal, wherein the specified duty ratio is in accounting for at least two duty ratio determination
Within the scope of sky ratio；
The mixing driving signal is applied to the base stage, it is multiple specified to work in driving the IGBT periodic cycle
Operating mode, the multiple assigned work mode include advanced ON operation mode, passing zero trigger operating mode and lag conducting
Operating mode.
2. the IGBT driving method of electromagnetic heater according to claim 1, which is characterized in that applied to the base stage
In specified time after adding the electric loading signal of specified duty ratio, the sampled signal of the collector is obtained, including in detail below
Step:
After applying the electric loading signal to the base stage, within the specified time for stopping applying the electric loading signal, acquisition
The signal of the collector carries out digital-to-analogue conversion processing to the signal of the collector, to obtain the sampled signal.
3. the IGBT driving method of electromagnetic heater according to claim 1, which is characterized in that believed according to the sampling
The appearance of passing zero trigger signal number is judged whether there is, comprising the following specific steps
Judge whether the sampled signal is greater than or equal to preset reference signal；
When determining that the sampled signal is greater than or equal to the preset reference signal, determination has the passing zero trigger signal to go out
It is existing.
4. the IGBT driving method of electromagnetic heater according to claim 3, which is characterized in that judge the sampling letter
Number whether be greater than or equal to preset reference signal, comprising the following specific steps
When determining that the sampled signal is less than the preset reference signal, determines and occur without the passing zero trigger signal.
5. the IGBT driving method of electromagnetic heater according to any one of claim 1 to 4, which is characterized in that also
Comprising the following specific steps
When determining not generating the passing zero trigger signal, increase the duty ratio of electric loading signal, and the electricity that duty ratio will be increased
Electric loading signal of the load signal as the specified duty ratio.
6. a kind of electromagnetic heater, including IGBT, the IGBT includes emitter, collector and base stage, which is characterized in that institute
State electromagnetic heater further include:
Acquiring unit, for obtaining institute within the specified time after the electric loading signal for applying specified duty ratio to the base stage
State the sampled signal of collector；
Judging unit occurs for judging whether there is passing zero trigger signal according to the sampled signal；
Determination unit, for determining the duration of the passing zero trigger signal when determining to occur the passing zero trigger signal；
Superpositing unit, for after determining the duration and the corresponding specified duty ratio, superposition processing at least two
The different driving signal of duty ratio, to generate mixing driving signal, wherein the specified duty ratio is in described at least two
Within the duty cycle range that duty ratio determines；
Driving unit, for the mixing driving signal to be applied to the base stage, with driving the IGBT periodic cycle
Multiple assigned work modes are worked in, the multiple assigned work mode includes advanced ON operation mode, passing zero trigger work
Mode and lag ON operation mode.
7. electromagnetic heater according to claim 6, which is characterized in that the acquiring unit further include:
Acquisition unit, after applying the electric loading signal to the base stage, in the finger for stopping applying the electric loading signal
In fixing time, the signal of the collector is acquired, digital-to-analogue conversion processing is carried out to the signal of the collector, to adopt described in acquisition
Sample signal.
8. electromagnetic heater according to claim 6, which is characterized in that the judging unit is also used to, described in judgement
Whether sampled signal is greater than or equal to preset reference signal；
The determination unit is also used to, and when determining that the sampled signal is greater than or equal to the preset reference signal, determination has
The passing zero trigger signal occurs.
9. electromagnetic heater according to claim 8, which is characterized in that the determination unit is also used to, and is determining institute
When stating sampled signal less than the preset reference signal, determines and occur without the passing zero trigger signal.
10. electromagnetic heater according to any one of claims 6 to 9, which is characterized in that further include:
Increasing unit for when determining not generating the passing zero trigger signal, increasing the duty ratio of electric loading signal, and will increase
Electric loading signal of the electric loading signal of big space rate as the specified duty ratio.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510484197.5A CN106413161B (en) | 2015-08-03 | 2015-08-03 | The IGBT driving method and electromagnetic heater of electromagnetic heater |
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| CN201510484197.5A CN106413161B (en) | 2015-08-03 | 2015-08-03 | The IGBT driving method and electromagnetic heater of electromagnetic heater |
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| CN106413161B true CN106413161B (en) | 2019-10-15 |
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| CN109951910B (en) * | 2017-12-21 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and IGBT drive control circuit and drive control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4448083B2 (en) * | 2005-11-15 | 2010-04-07 | 象印マホービン株式会社 | Induction heating cooker |
| CN204259199U (en) * | 2014-12-16 | 2015-04-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating control circuit, electromagnetic heater and electromagnetic oven |
| CN204442724U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN206807809U (en) * | 2017-03-06 | 2017-12-26 | 浙江亿洋智能装备科技股份有限公司 | Infrared temperature detecting wireless transmission IGBT full-bridge energy-conservation induction heating equipments |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4448083B2 (en) * | 2005-11-15 | 2010-04-07 | 象印マホービン株式会社 | Induction heating cooker |
| CN204259199U (en) * | 2014-12-16 | 2015-04-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating control circuit, electromagnetic heater and electromagnetic oven |
| CN204442724U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN206807809U (en) * | 2017-03-06 | 2017-12-26 | 浙江亿洋智能装备科技股份有限公司 | Infrared temperature detecting wireless transmission IGBT full-bridge energy-conservation induction heating equipments |
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