CN106714352B - The determination method of passing zero trigger time determines system and electromagnetic heater - Google Patents
The determination method of passing zero trigger time determines system and electromagnetic heater Download PDFInfo
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- CN106714352B CN106714352B CN201510483998.XA CN201510483998A CN106714352B CN 106714352 B CN106714352 B CN 106714352B CN 201510483998 A CN201510483998 A CN 201510483998A CN 106714352 B CN106714352 B CN 106714352B
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Abstract
The present invention provides the determination method of passing zero trigger time a kind of, determine system and electromagnetic heater, wherein, the determination method of the passing zero trigger time, it include: to obtain the sampled signal of the collector within the specified time after the electric loading signal for applying specified duty ratio to the collector；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；Obtain pre-stored first time value and the second time value, the difference of the first time value is subtracted as the lower limit value of the passing zero trigger time using the duration, the difference of second time value is subtracted as the upper limit value of the passing zero trigger time, to complete the determination process of the threshold range of the passing zero trigger time using the duration.Technical solution through the invention improves cooking efficiency, reduces power consumption, improves the experience of user.
Description
Technical field
The present invention relates to fields of home appliance technology, more specifically, be related to a kind of passing zero trigger time determination method,
The determination system of passing zero trigger time a kind of 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 the determination method of new passing zero trigger time a kind of.
It is another object of the present invention to propose the determination system of passing zero trigger time a kind of.
Yet another object of the invention is that proposing a kind of electromagnetic heater.
To achieve the above object, according to the embodiment of the first aspect of the invention, a kind of passing zero trigger time is proposed
It determines method, is suitable for thyristor switch, the thyristor switch includes emitter and collector, the passing zero trigger time
The method of determination includes: within the specified time after the electric loading signal for applying specified duty ratio to the collector, described in acquisition
The sampled signal of collector；Passing zero trigger signal is judged whether there is according to the sampled signal to occur；Determining the mistake occur
When zero Continuity signal, the duration of the passing zero trigger signal is determined；Obtain pre-stored first time value and the second time
Value, subtracts the difference of the first time value as the lower limit value of the passing zero trigger time, with described using the duration
Duration subtracts upper limit value of the difference of second time value as the passing zero trigger time, is led with completing the zero passage
The determination process of the threshold range of logical time.
The determination method of zero turn-on time of embodiment according to the present invention determines zero passage by the sampled signal of collector
Turn-on time realizes the accurately judgement to the passing zero trigger time, while the load letter that can trigger passing zero trigger has been determined
Number, to improve the reliability of IGBT, so that it is worked in passing zero trigger state as much as possible, and then saved power consumption, mention
Reliability has been risen, namely the type of cookware has been determined according to the passing zero trigger time, and then improve and add to the matching of diversified cookware
Thermal process, meanwhile, it ensure that prompt effect when cookware mismatches, to improve the cooking efficiency of user, wherein be worth at the first time
It can be calculated value or laboratory mean values with the second time value.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding thyristor switch is opened is determined
The intensity of LC (coil panel and resonant capacitance) loop power, energy intensity determine the wave amplitude of LC concussion, and then can predict VCE(collection
Voltage between electrode and emitter) voltage change amplitude, thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristor when swingingCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collect
The sampled signal and V of electrodeCEIt 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 thyristor switch, and resulting sampled signal is inputted into list
The included AD conversion module (D/A converter module) of piece machine first passes through AD conversion chip gained signal is inputed to monolithic again
Machine realizes the conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that
Single-chip microcontroller can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point is become just from zero or negative value
Point when value, single-chip microcontroller pass through identification this point of passing zero trigger, and the self-resonance voltage after shutdown and the benchmark of setting is electric
Pressure is compared, and is allowed single-chip microcontroller to judge 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 that above embodiment of the present invention, also has following additional
Technical characteristic:
According to one embodiment of present invention, it is preferable that the collector apply electric loading signal after it is specified when
In, the sampled signal of the collector is obtained, comprising the following specific steps applying the electric loading signal to the collector
Afterwards, within the specified time for stopping applying the electric loading signal, the signal of the collector is acquired, to the letter of the collector
Number carry out digital-to-analogue conversion processing, to obtain the sampled signal.
The determination method of the passing zero trigger time of embodiment according to the present invention, by stopping in electric loading signal to base stage
Base signal is acquired in specified time after power supply, is reduced detection range, is improved the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of thyristor switch, and resulting sampled signal is inputted
The included AD conversion module (D/A converter module) of single-chip microcontroller first passes through AD conversion chip gained signal is inputed to list again
Obtained digital signal indirect assignment to program is enabled single-chip microcontroller to judge to trigger there are passing zero trigger point by piece machine
Voltage to positive value is become from zero when point, may thereby determine that the passing zero trigger time.
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 determination method of the passing zero trigger time of embodiment according to the present invention, by judge sampled signal whether be greater than or
It realizes to determine that passing zero trigger signal occurs equal to preset reference signal and rapidly judges and be automatically found thyristor switch
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetism and add
The matching process of thermal 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 determination method of the passing zero trigger time of embodiment according to the present invention determines that sampled signal is less than by being set in
When preset reference signal, determines and occur without passing zero trigger signal, further assured that the reliability of determining passing zero trigger time
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 determination method of the passing zero trigger time of embodiment according to the present invention, by the way that passing zero trigger signal is being not detected
When, the duty ratio of electric loading signal is improved, namely improve the power for being applied to IGBT, thus when accelerating determining passing zero trigger
Between efficiency, wherein the raising of duty ratio can be according to step value is preset, or be surveyed according to preset power curve
Examination, until generating passing zero trigger signal.
Embodiment according to a second aspect of the present invention, it is also proposed that a kind of determination system of passing zero trigger time is suitable for
Thyristor switch, the thyristor switch include emitter and collector, and the determination system of passing zero trigger time includes: to obtain list
Member, for obtaining the collector within the specified time after the electric loading signal for applying specified duty ratio to the collector
Sampled signal；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；The determination unit
It is also used to, obtains pre-stored first time value and the second time value, the first time value is subtracted with the duration
Lower limit value of the difference as the passing zero trigger time subtracts the difference of second time value as institute using the duration
The upper limit value of passing zero trigger time is stated, to complete the determination process of the threshold range of the passing zero trigger time.
The determination system of the passing zero trigger time of embodiment according to the present invention, was determined by the sampled signal of collector
Zero turn-on time realizes the accurately judgement to the passing zero trigger time, while the load that can trigger passing zero trigger has been determined
Signal makes it work in passing zero trigger state as much as possible, and then saved power consumption to improve the reliability of IGBT,
Reliability is improved, namely the type of cookware has been determined according to the passing zero trigger time, and then improve the matching to diversified cookware
Heating process, meanwhile, it ensure that prompt effect when cookware mismatches, to improve the cooking efficiency of user, wherein at the first time
Value and the second time value can be calculated value or laboratory mean values.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding thyristor switch is opened is determined
The intensity of LC (coil panel and resonant capacitance) loop power, energy intensity determine the wave amplitude of LC concussion, and then can predict VCE(collection
Voltage between electrode and emitter) voltage change amplitude, thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristor when swingingCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collect
The sampled signal and V of electrodeCEIt 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 thyristor switch, and resulting sampled signal is inputted into list
The included AD conversion module (D/A converter module) of piece machine first passes through AD conversion chip gained signal is inputed to monolithic again
Machine realizes the conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that
Single-chip microcontroller can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point is become just from zero or negative value
Point when value, single-chip microcontroller pass through identification this point of passing zero trigger, and the self-resonance voltage after shutdown and the benchmark of setting is electric
Pressure is compared, and is allowed single-chip microcontroller to judge 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 acquiring unit further include: acquisition unit, for described
After collector applies the electric loading signal, within the specified time for stopping applying the electric loading signal, the current collection is acquired
The signal of pole carries out digital-to-analogue conversion processing to the signal of the collector, to obtain the sampled signal.
The determination system of the passing zero trigger time of embodiment according to the present invention, by stopping in electric loading signal to base stage
Base signal is acquired in specified time after power supply, is reduced detection range, is improved the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of thyristor switch, and resulting sampled signal is inputted
The included AD conversion module (D/A converter module) of single-chip microcontroller first passes through AD conversion chip gained signal is inputed to list again
Obtained digital signal indirect assignment to program is enabled single-chip microcontroller to judge to trigger there are passing zero trigger point by piece machine
Voltage to positive value is become from zero when point, may thereby determine that the passing zero trigger time.
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 determination system of the passing zero trigger time of embodiment according to the present invention, by judge sampled signal whether be greater than or
It realizes to determine that passing zero trigger signal occurs equal to preset reference signal and rapidly judges and be automatically found thyristor switch
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetism and add
The matching process of thermal and the heating mode of different cookwares, reduces 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 determination system of the passing zero trigger time of embodiment according to the present invention determines that sampled signal is less than by being set in
When preset reference signal, determines and occur without passing zero trigger signal, further assured that the reliability of determining passing zero trigger time
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 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 determination system of the passing zero trigger time of embodiment according to the present invention, by the way that passing zero trigger signal is being not detected
When, the duty ratio of electric loading signal is improved, namely improve the power for being applied to IGBT, thus when accelerating determining passing zero trigger
Between efficiency, wherein the raising of duty ratio can be according to step value is preset, or be surveyed according to preset power curve
Examination, until generating passing zero trigger signal.
Embodiment according to a third aspect of the present invention, it is also proposed that a kind of electromagnetic heater, including such as any of the above-described
The determination system of passing zero trigger time described in technical solution.
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 schematic flow diagram of the determination method of passing zero trigger time according to an embodiment of the invention；
Fig. 2 shows the schematic block diagrams of the determination system of passing zero trigger time according to an embodiment of the invention；
Fig. 3 shows the structural block diagram of electromagnetic heater according to an embodiment of the invention；
Fig. 4 shows the schematic flow diagram of the control method of electromagnetic heater according to an embodiment of the invention；
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 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 schematic flow diagram of the determination method of passing zero trigger time according to an embodiment of the invention.
As shown in Figure 1, the determination method of passing zero trigger time according to an embodiment of the present invention, the thyristor switch include
The determination method of emitter, collector and collector, the passing zero trigger time includes: step 102, is applied to the collector
In specified time after adding the electric loading signal of specified duty ratio, the sampled signal of the collector is obtained；Step 104, according to
The sampled signal judges whether there is the appearance of passing zero trigger signal；Step 106, when determining to occur the passing zero trigger signal,
Determine the duration of the passing zero trigger signal；Step 108, pre-stored first time value and the second time value are obtained, with
The duration subtracts lower limit value of the difference of the first time value as the passing zero trigger time, when with described continuing
Between subtract upper limit value of the difference of second time value as the passing zero trigger time, to complete the passing zero trigger time
Threshold range determination process.
The determination method of zero turn-on time of embodiment according to the present invention determines zero passage by the sampled signal of collector
Turn-on time realizes the accurately judgement to the passing zero trigger time, while the load letter that can trigger passing zero trigger has been determined
Number, to improve the reliability of IGBT, so that it is worked in passing zero trigger state as much as possible, and then saved power consumption, mention
Reliability has been risen, namely the type of cookware has been determined according to the passing zero trigger time, and then improve and add to the matching of diversified cookware
Thermal process, meanwhile, it ensure that prompt effect when cookware mismatches, to improve the cooking efficiency of user, wherein be worth at the first time
It can be calculated value or laboratory mean values with the second time value.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding thyristor switch is opened is determined
The intensity of LC (coil panel and resonant capacitance) loop power, energy intensity determine the wave amplitude of LC concussion, and then can predict VCE(collection
Voltage between electrode and emitter) voltage change amplitude, thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristor when swingingCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collect
The sampled signal and V of electrodeCEIt 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 thyristor switch, and resulting sampled signal is inputted into list
The included AD conversion module (D/A converter module) of piece machine first passes through AD conversion chip gained signal is inputed to monolithic again
Machine realizes the conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that
Single-chip microcontroller can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point is become just from zero or negative value
Point when value, single-chip microcontroller pass through identification this point of passing zero trigger, and the self-resonance voltage after shutdown and the benchmark of setting is electric
Pressure is compared, and is allowed single-chip microcontroller to judge 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 that above embodiment of the present invention, also has following additional
Technical characteristic:
According to one embodiment of present invention, it is preferable that the collector apply electric loading signal after it is specified when
In, the sampled signal of the collector is obtained, comprising the following specific steps applying the electric loading signal to the collector
Afterwards, within the specified time for stopping applying the electric loading signal, the signal of the collector is acquired, to the letter of the collector
Number carry out digital-to-analogue conversion processing, to obtain the sampled signal.
The determination method of the passing zero trigger time of embodiment according to the present invention, by stopping in electric loading signal to base stage
Base signal is acquired in specified time after power supply, is reduced detection range, is improved the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of thyristor switch, and resulting sampled signal is inputted
The included AD conversion module (D/A converter module) of single-chip microcontroller first passes through AD conversion chip gained signal is inputed to list again
Obtained digital signal indirect assignment to program is enabled single-chip microcontroller to judge to trigger there are passing zero trigger point by piece machine
Voltage to positive value is become from zero when point, may thereby determine that the passing zero trigger time.
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 determination method of the passing zero trigger time of embodiment according to the present invention, by judge sampled signal whether be greater than or
It realizes to determine that passing zero trigger signal occurs equal to preset reference signal and rapidly judges and be automatically found thyristor switch
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetism and add
The matching process of thermal 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 determination method of the passing zero trigger time of embodiment according to the present invention determines that sampled signal is less than by being set in
When preset reference signal, determines and occur without passing zero trigger signal, further assured that the reliability of determining passing zero trigger time
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 determination method of the passing zero trigger time of embodiment according to the present invention, by the way that passing zero trigger signal is being not detected
When, the duty ratio of electric loading signal is improved, namely improve the power for being applied to IGBT, thus when accelerating determining passing zero trigger
Between efficiency, wherein the raising of duty ratio can be according to step value is preset, or be surveyed according to preset power curve
Examination, until generating passing zero trigger signal.
Fig. 2 shows the schematic block diagrams of the determination system of passing zero trigger time according to an embodiment of the invention.
As shown in Fig. 2, the determination system 200 of passing zero trigger time according to an embodiment of the present invention, is opened suitable for thyristor
It closes, the thyristor switch includes emitter and collector, and the determination system of passing zero trigger time includes: acquiring unit 202, is used
In within the specified time after the electric loading signal for applying specified duty ratio to the collector, the sampling of the collector is obtained
Signal；Judging unit 204 occurs for judging whether there is passing zero trigger signal according to the sampled signal；Determination unit 206,
For determining the duration of the passing zero trigger signal when determining to occur the passing zero trigger signal；The determination unit
206 are also used to, and obtain pre-stored first time value and the second time value, subtract the first time value with the duration
Lower limit value of the difference as the passing zero trigger time, using the duration subtract the difference of second time value as
The upper limit value of the passing zero trigger time, to complete the determination process of the threshold range of the passing zero trigger time.
The determination system of the passing zero trigger time of embodiment according to the present invention, was determined by the sampled signal of collector
Zero turn-on time realizes the accurately judgement to the passing zero trigger time, while the load that can trigger passing zero trigger has been determined
Signal makes it work in passing zero trigger state as much as possible, and then saved power consumption to improve the reliability of IGBT,
Reliability is improved, namely the type of cookware has been determined according to the passing zero trigger time, and then improve the matching to diversified cookware
Heating process, meanwhile, it ensure that prompt effect when cookware mismatches, to improve the cooking efficiency of user, meanwhile, it ensure that pot
Prompt effect when tool mismatches, to improve the cooking efficiency of user, wherein value and the second time value can be reason at the first time
By calculated value or laboratory mean values.
Specifically, for the electromagnetic heaters such as electromagnetic oven, the length of time that preceding thyristor switch is opened is determined
The intensity of LC (coil panel and resonant capacitance) loop power, energy intensity determine the wave amplitude of LC concussion, and then can predict VCE(collection
Voltage between electrode and emitter) voltage change amplitude, thyristor LC (coil panel and resonant capacitance) shakes naturally after shutdown
The V of thyristor when swingingCE(voltage between collector and emitter) voltage follow fluctuation, wherein VCEAmplitude it is larger, and collect
The sampled signal and V of electrodeCEIt 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 thyristor switch, and resulting sampled signal is inputted into list
The included AD conversion module (D/A converter module) of piece machine first passes through AD conversion chip gained signal is inputed to monolithic again
Machine realizes the conversion between analog signal and digital signal, and by obtained digital signal indirect assignment to program, so that
Single-chip microcontroller can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point is become just from zero or negative value
Point when value, single-chip microcontroller pass through identification this point of passing zero trigger, and the self-resonance voltage after shutdown and the benchmark of setting is electric
Pressure is compared, and is allowed single-chip microcontroller to judge 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 acquiring unit 202 further include: acquisition unit 2022 is used for
After applying the electric loading signal to the collector, within the specified time for stopping applying the electric loading signal, institute is acquired
The signal for stating collector carries out digital-to-analogue conversion processing to the signal of the collector, to obtain the sampled signal.
The determination system of the passing zero trigger time of embodiment according to the present invention, by stopping in electric loading signal to base stage
Base signal is acquired in specified time after power supply, is reduced detection range, is improved the reliability of detection process.
Specifically, when obtaining the sampled signal of collector of thyristor switch, and resulting sampled signal is inputted
The included AD conversion module (D/A converter module) of single-chip microcontroller first passes through AD conversion chip gained signal is inputed to list again
Obtained digital signal indirect assignment to program is enabled single-chip microcontroller to judge to trigger there are passing zero trigger point by piece machine
Voltage to positive value is become from zero when point, may thereby determine that the passing zero trigger time.
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 determination system of the passing zero trigger time of embodiment according to the present invention, by judge sampled signal whether be greater than or
It realizes to determine that passing zero trigger signal occurs equal to preset reference signal and rapidly judges and be automatically found thyristor switch
The optimal passing zero trigger time, and then driving synchronization scheme is adjusted according to the passing zero trigger time, namely realize electromagnetism and add
The matching process of thermal and the heating mode of different cookwares, reduces 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 determination system of the passing zero trigger time of embodiment according to the present invention determines that sampled signal is less than by being set in
When preset reference signal, determines and occur without passing zero trigger signal, further assured that the reliability of determining passing zero trigger time
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 further include: increasing unit 208, 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 determination system of the passing zero trigger time of embodiment according to the present invention, by the way that passing zero trigger signal is being not detected
When, the duty ratio of electric loading signal is improved, namely improve the power for being applied to IGBT, thus when accelerating determining passing zero trigger
Between efficiency, wherein the raising of duty ratio can be according to step value is preset, or be surveyed according to preset power curve
Examination, until generating passing zero trigger signal.
Fig. 3 shows the structural block diagram of electromagnetic heater according to an embodiment of the invention.
As shown in figure 3, electromagnetic heater 300 according to an embodiment of the invention, comprising: such as any of the above-described skill
The determination system 200 of passing zero trigger time described in art scheme.
Fig. 4 shows the schematic flow diagram of the control method of electromagnetic heater according to an embodiment of the invention.
As shown in figure 4, the control method of electromagnetic heater according to an embodiment of the invention, comprising: step
402, sentence a pot program；Step 404, initial laser heating (minimum PPG value)；Step 406, shutdown makes its self-oscillation after work 5ms
(being in power-frequency voltage wave crest)；Step 408, PPG extends certain value；Step 410, trigger signal generation is judged whether there is, if so,
412 are thened follow the steps, if not (as shown in Figure 5), thens follow the steps 408；Step 412, determine that the IGBT zero passage under best PPG is led
The logical time；Step 414, passing zero trigger time and cookware type are matched；Step 416, judge that any power obtained refers to
The type of order；Step 418, low-power instruction control sub-process；Step 420, high power instruction control sub-process；Step 422, base
Quasi- power control sub-process.
Specifically, in step 404, control electromagnetic heater is heated under default heating time, is tied in heating
Electromagnetic heater enters self-resonance state namely above-mentioned self-oscillation state after beam, when self-resonance voltage starts with self-resonance
Between growth and constantly reduce so that be lower than reference voltage when carry out time record, using magnetic furnace shut down after (IGBT is relatively long
Time shutdown) LC (coil panel and resonant capacitance) from shake when IGBT VCEThe principle of voltage follow fluctuation is realized.Before shutdown
The length of time that IGBT is opened, determines the intensity of LC loop power, and energy intensity determines the wave amplitude of LC concussion, and then VCEChange
Change amplitude 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 journey
After degree, passing zero trigger is presented in IGBT, can also generate trigger signal 1 as shown in FIG. 6, and IGBT is to be connected in advance before,
Certainly low again just to will appear lag conducting, at the beginning of recording trigger signal 1 to self-oscillation state, determine that benchmark heats with this
Time then controls the duty for increasing PPG if not occurring trigger signal 1 during the self-resonance voltage of IGBT is decreased to zero
It whether there is trigger signal 1 than simultaneously real-time testing.Electromagnetic heating control program according to the present invention seeks to that single-chip microcontroller is allowed to identify
This point of passing zero trigger, and record the time that IGBT at this time is opened, wherein different coil panel, resonant capacitance, disk spacing with
The combination of cookware keeps the time that IGBT is opened when IGBT passing zero trigger different.
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 the determination sides of passing zero trigger time a kind of
Method, the determination system for a kind of thyristor switch passing zero trigger time and a kind of electromagnetic heater make electromagnetic oven, pass through
The sampled signal of collector determines the passing zero trigger time, realizes the accurately judgement to the passing zero trigger time, has determined simultaneously
The load signal of passing zero trigger can be triggered, to improve the reliability of IGBT, so that it is worked in zero passage as much as possible and leads
Logical state, and then power consumption has been saved, improve reliability.
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 (11)
1. a kind of determination method of passing zero trigger time, be suitable for thyristor switch, the thyristor switch include emitter and
Collector, which is characterized in that the determination method of the passing zero trigger time includes:
Within the specified time after the electric loading signal for applying specified duty ratio to the collector, adopting for the collector is obtained
Sample 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；
Pre-stored first time value and the second time value are obtained, the difference of the first time value is subtracted with the duration
As the lower limit value of the passing zero trigger time, the difference of second time value is subtracted as the mistake using the duration
The upper limit value of zero turn-on time, to complete the determination process of the threshold range of the passing zero trigger time.
2. the determination method of passing zero trigger time according to claim 1, which is characterized in that apply to the collector
In specified time after the electric loading signal of specified duty ratio, the sampled signal of the collector is obtained, including walk in detail below
It is rapid:
After applying the electric loading signal to the collector, within the specified time for stopping applying the electric loading signal, adopt
The signal for collecting the collector carries out digital-to-analogue conversion processing to the signal of the collector, to obtain the sampled signal.
3. the determination method of passing zero trigger time according to claim 1, which is characterized in that sentenced according to the sampled signal
It is disconnected whether to have the appearance of passing zero trigger signal, 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 determination method of passing zero trigger time according to claim 3, which is characterized in that judge that the sampled signal is
It is no to 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 determination method of passing zero trigger time according to any one of claim 1 to 4, which is characterized in that further include
Step in detail below:
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 determination system of passing zero trigger time, be suitable for thyristor switch, the thyristor switch include emitter and
Collector, which is characterized in that the determination system of the passing zero trigger time includes:
Acquiring unit, for obtaining within the specified time after the electric loading signal for applying specified duty ratio to the collector
The sampled signal of the 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；
The determination unit is also used to, and is obtained pre-stored first time value and the second time value, is subtracted with the duration
Lower limit value of the difference of the first time value as the passing zero trigger time, when subtracting described second with the duration
Between the upper limit value of the difference that is worth as the passing zero trigger time, to complete the determination of the threshold range of the passing zero trigger time
Process.
7. the determination system of passing zero trigger time according to claim 6, which is characterized in that the acquiring unit is also wrapped
It includes:
Acquisition unit is stopping applying the electric loading signal after applying the electric loading signal to the collector
In specified time, the signal of the collector is acquired, digital-to-analogue conversion processing is carried out to the signal of the collector, described in obtaining
Sampled signal.
8. the determination system of passing zero trigger time according to claim 6, which is characterized in that the judging unit is also used
In judging whether the 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. the determination system of passing zero trigger time according to claim 8, which is characterized in that the determination unit is also used
In determining to occur without the passing zero trigger signal when determining that the sampled signal is less than the preset reference signal.
10. the determination system of passing zero trigger time according to any one of claims 6 to 9, which is characterized in that also wrap
It includes:
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.
11. a kind of electromagnetic heater characterized by comprising the passing zero trigger as described in any one of claim 6 to 10
The determination system of time.
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| CN101326857A (en) * | 2005-10-14 | 2008-12-17 | E.G.O.电气设备制造股份有限公司 | Method for operating an induction heating device |
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| CN102313307A (en) * | 2011-09-13 | 2012-01-11 | 深圳麦格米特电气股份有限公司 | Method of switching power for variable frequency microwave oven |
| CN103262648A (en) * | 2010-12-03 | 2013-08-21 | 三井造船株式会社 | Induction heating device, induction heating method, and program |
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| CN101326857A (en) * | 2005-10-14 | 2008-12-17 | E.G.O.电气设备制造股份有限公司 | Method for operating an induction heating device |
| CN101461283A (en) * | 2006-06-02 | 2009-06-17 | 松下电器产业株式会社 | Power control apparatus for high frequency dielectric heating and control method employed by the power control apparatus |
| CN103262648A (en) * | 2010-12-03 | 2013-08-21 | 三井造船株式会社 | Induction heating device, induction heating method, and program |
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