CN106714353B - 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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- CN106714353B CN106714353B CN201510484198.XA CN201510484198A CN106714353B CN 106714353 B CN106714353 B CN 106714353B CN 201510484198 A CN201510484198 A CN 201510484198A CN 106714353 B CN106714353 B CN 106714353B
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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 passing zero trigger time, comprising: within the specified time after the electric loading signal for applying specified duty ratio to collector, obtain the sampled signal of collector；Judged whether to generate trigger signal according to sampled signal；When determining to generate trigger signal, according to the size relation of trigger signal and the first default trigger signal, the size relation of trigger signal and the second default trigger signal, and trigger signal and third preset the size relation of trigger signal, determine the threshold range of passing zero trigger time, wherein, less than the second default trigger signal, the second default trigger signal is less than third and presets trigger signal the first default trigger signal.Technical solution through the invention heats cooking apparatus with optimal operating mode, reduces power consumption so that electromagnetic heater is matched with diversified cooking apparatus, improves the usage 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
Determine method, comprising: 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；Judged whether to generate trigger signal according to the sampled signal；Determining to generate the trigger signal
When, according to the size relation of the trigger signal and the first default trigger signal, the trigger signal and the second default triggering letter
Number size relation and the trigger signal and third preset the size relation of trigger signal, when determining the passing zero trigger
Between threshold range, wherein the first default trigger signal is less than the described second default trigger signal, the described second default touching
It signals to be less than the default trigger signal of the third.
The determination method of zero turn-on time of embodiment according to the present invention passes through detection trigger signal and the first default touching
Signalling and the second default trigger signal and the size relation with third trigger signal, it is determined that the model of passing zero trigger time
It encloses, 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 is risen, wherein the first default trigger signal corresponds to advanced Continuity signal, and the second default trigger signal corresponds to zero passage
Continuity signal, third preset trigger signal and correspond to lag Continuity signal.
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 base
The sampled signal and V of poleCEIt is positively correlated, therefore, using the trigger signal of base stage 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 base stage of thyristor switch, and resulting sampled signal is inputted into monolithic
The included AD conversion module (D/A converter module) of machine first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again,
The conversion between analog signal and digital signal is realized, and by obtained digital signal indirect assignment to program, so that single
Piece machine can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point becomes positive value from zero or negative value
When point, single-chip microcontroller is by identification this point of passing zero trigger, and by the reference voltage of the self-resonance voltage after shutdown and setting
It is compared, single-chip microcontroller is allowed 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 when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, including
Step in detail below: it is determining that the trigger signal is greater than or equal to the described first default trigger signal, and is being less than described second
When default trigger signal, the trigger signal is determined as the first trigger signal, at the time of recording first trigger signal, with
Using at the time of first trigger signal as the lower limit value of the threshold range.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining the first default trigger signal,
The lower limit value of passing zero trigger time has been determined, has improved the control to the passing zero trigger time of IGBT, thereby reduces power consumption.
According to one embodiment of present invention, it is preferable that when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, also wrap
It includes step in detail below: determining that the trigger signal is greater than or equal to the described second default trigger signal, and be less than described the
When three default trigger signals, the trigger signal is determined as the second trigger signal, records continuing for second trigger signal
Time, using the duration of second trigger signal as passing zero trigger time reference value.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining the second default trigger signal,
The a reference value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, also wrap
It includes step in detail below: determining the trigger signal more than or equal to the default trigger signal of the third, by triggering letter
Number it is determined as third trigger signal, at the time of recording the third trigger signal, makees at the time of by the third trigger signal
For the upper limit value of the threshold range.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining that third presets trigger signal,
The upper limit value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that judged whether to generate trigger signal, packet according to the sampled signal
It includes step in detail below: when determining not generate the trigger signal, increasing the duty ratio of electric loading signal, and duty will be increased
Electric loading signal of the electric loading signal of ratio as the specified duty ratio.
The determination method of the passing zero trigger time of embodiment according to the present invention, by when trigger signal is not detected,
The duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to step value is preset, or be tested according to preset power curve,
Until generating trigger signal.
A kind of embodiment according to a second aspect of the present invention, it is also proposed that determination system of passing zero trigger time, comprising: obtain
Unit is taken, for obtaining the collection within the specified time after the electric loading signal for applying specified duty ratio to the collector
The sampled signal of electrode；Judging unit generates trigger signal for judging whether according to the sampled signal；Determination unit is used
In determine generate the trigger signal when, it is described according to the size relation of the trigger signal and the first default trigger signal
The size relation and the trigger signal and third of trigger signal and the second default trigger signal preset the size of trigger signal
Relationship determines the threshold range of the passing zero trigger time, wherein it is default that the first default trigger signal is less than described second
Trigger signal, the second default trigger signal are less than the third and preset trigger signal.
The determination system of the passing zero trigger time of embodiment according to the present invention, it is default with first by detection trigger signal
Trigger signal and the second default trigger signal and the size relation with third trigger signal, it is determined that the passing zero trigger time
Range makes it work in passing zero trigger state as much as possible, and then saved power consumption to improve the reliability of IGBT,
Improve reliability, wherein the first default trigger signal corresponds to advanced Continuity signal, and the second default trigger signal corresponded to
Zero Continuity signal, third preset trigger signal and correspond to lag Continuity signal.
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 base
The sampled signal and V of poleCEIt is positively correlated, therefore, using the trigger signal of base stage 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 base stage of thyristor switch, and resulting sampled signal is inputted into monolithic
The included AD conversion module (D/A converter module) of machine first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again,
The conversion between analog signal and digital signal is realized, and by obtained digital signal indirect assignment to program, so that single
Piece machine can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point becomes positive value from zero or negative value
When point, single-chip microcontroller is by identification this point of passing zero trigger, and by the reference voltage of the self-resonance voltage after shutdown and setting
It is compared, single-chip microcontroller is allowed 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 determination unit further include: recording unit, in determination
The trigger signal be greater than or equal to the described first default trigger signal, and be less than the second default trigger signal when, by institute
It states trigger signal and is determined as the first trigger signal, at the time of recording first trigger signal, by first trigger signal
At the time of lower limit value as the threshold range.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining the first default trigger signal,
The lower limit value of passing zero trigger time has been determined, has improved the control to the passing zero trigger time of IGBT, thereby reduces power consumption.
According to one embodiment of present invention, it is preferable that the recording unit is also used to, and is determining that the trigger signal is big
In or be equal to the described second default trigger signal, and be less than the third preset trigger signal when, the trigger signal is determined
For the second trigger signal, the duration of second trigger signal is recorded, by the duration of second trigger signal
As passing zero trigger time reference value.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining the second default trigger signal,
The a reference value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that the recording unit is also used to, and is determining that the trigger signal is big
Trigger signal is preset in or equal to the third, the trigger signal is determined as third trigger signal, records the third touching
At the time of signalling, using at the time of the third trigger signal as the upper limit value of the threshold range.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining that third presets trigger signal,
The upper limit value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that further include: increasing unit, for determining not generating the touching
When signalling, increase the duty ratio of electric loading signal, and the electric loading signal of duty ratio will be increased as the specified duty ratio
Electric loading signal.
The determination system of the passing zero trigger time of embodiment according to the present invention, by when trigger signal is not detected,
The duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to step value is preset, or be tested according to preset power curve,
Until generating 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, comprising: step 102, right
In specified time after the electric loading signal of the specified duty ratio of collector application, the sampled signal of the collector is obtained；
Step 104, judge whether to generate trigger signal according to the sampled signal；Step 106, when the raw trigger signal, according to described
The size of the size relation of trigger signal and the first default trigger signal, the trigger signal and the second default trigger signal is closed
System and the trigger signal and third preset the size relation of trigger signal, determine the threshold value model of the passing zero trigger time
It encloses, wherein the first default trigger signal is less than the described second default trigger signal, and the second default trigger signal is less than
The third presets trigger signal.
The determination method of zero turn-on time of embodiment according to the present invention passes through detection trigger signal and the first default touching
Signalling and the second default trigger signal and the size relation with third trigger signal, it is determined that the model of passing zero trigger time
It encloses, 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 is risen, wherein the first default trigger signal corresponds to advanced Continuity signal, and the second default trigger signal corresponds to zero passage
Continuity signal, third preset trigger signal and correspond to lag Continuity signal.
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 base
The sampled signal and V of poleCEIt is positively correlated, therefore, using the trigger signal of base stage 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 base stage of thyristor switch, and resulting sampled signal is inputted into monolithic
The included AD conversion module (D/A converter module) of machine first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again,
The conversion between analog signal and digital signal is realized, and by obtained digital signal indirect assignment to program, so that single
Piece machine can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point becomes positive value from zero or negative value
When point, single-chip microcontroller is by identification this point of passing zero trigger, and by the reference voltage of the self-resonance voltage after shutdown and setting
It is compared, single-chip microcontroller is allowed 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 when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, including
Step in detail below: it is determining that the trigger signal is greater than or equal to the described first default trigger signal, and is being less than described second
When default trigger signal, the trigger signal is determined as the first trigger signal, at the time of recording first trigger signal, with
Using at the time of first trigger signal as the lower limit value of the threshold range.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining the first default trigger signal,
The lower limit value of passing zero trigger time has been determined, has improved the control to the passing zero trigger time of IGBT, thereby reduces power consumption.
According to one embodiment of present invention, it is preferable that when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, also wrap
It includes step in detail below: determining that the trigger signal is greater than or equal to the described second default trigger signal, and be less than described the
When three default trigger signals, the trigger signal is determined as the second trigger signal, records continuing for second trigger signal
Time, using the duration of second trigger signal as passing zero trigger time reference value.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining the second default trigger signal,
The a reference value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that when determining to generate the trigger signal, believed according to the triggering
Size relation number with the first default trigger signal, the size relation of the trigger signal and the second default trigger signal, and
The trigger signal and third preset the size relation of trigger signal, determine the threshold range of the passing zero trigger time, also wrap
It includes step in detail below: determining the trigger signal more than or equal to the default trigger signal of the third, by triggering letter
Number it is determined as third trigger signal, at the time of recording the third trigger signal, makees at the time of by the third trigger signal
For the upper limit value of the threshold range.
The determination method of the passing zero trigger time of embodiment according to the present invention, by determining that third presets trigger signal,
The upper limit value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that judged whether to generate trigger signal, packet according to the sampled signal
It includes step in detail below: when determining not generate the trigger signal, increasing the duty ratio of electric loading signal, and duty will be increased
Electric loading signal of the electric loading signal of ratio as the specified duty ratio.
The determination method of the passing zero trigger time of embodiment according to the present invention, by when trigger signal is not detected,
The duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to step value is preset, or be tested according to preset power curve,
Until generating 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, comprising: acquiring unit
202, 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 204 generates trigger signal for judging whether according to the sampled signal；Determination unit 206,
For determine generate the trigger signal when, according to the size relation of the trigger signal and the first default trigger signal, institute
The size relation and the trigger signal and third for stating trigger signal and the second default trigger signal preset the big of trigger signal
Small relationship determines the threshold range of the passing zero trigger time, wherein it is pre- that the first default trigger signal is less than described second
If trigger signal, the second default trigger signal is less than the third and presets trigger signal.
The determination system of the passing zero trigger time of embodiment according to the present invention, it is default with first by detection trigger signal
Trigger signal and the second default trigger signal and the size relation with third trigger signal, it is determined that the passing zero trigger time
Range makes it work in passing zero trigger state as much as possible, and then saved power consumption to improve the reliability of IGBT,
Improve reliability, wherein the first default trigger signal corresponds to advanced Continuity signal, and the second default trigger signal corresponded to
Zero Continuity signal, third preset trigger signal and correspond to lag Continuity signal.
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
The voltage change amplitude of (voltage between collector and emitter), thyristor LC (coil panel and resonant capacitance) is natural after shutdown
VCE (voltage between collector and emitter) the voltage follow fluctuation of thyristor when concussion, wherein the amplitude of VCE is larger, and
The sampled signal and VCE of base stage are positively correlated, and therefore, using the trigger signal of base stage as the foundation for judging passing zero trigger, are reduced
Detection range, improves the reliability of detection process.
Wherein, by obtaining the sampled signal of the base stage of thyristor switch, and resulting sampled signal is inputted into monolithic
The included AD conversion module (D/A converter module) of machine first passes through AD conversion chip gained signal is inputed to single-chip microcontroller again,
The conversion between analog signal and digital signal is realized, and by obtained digital signal indirect assignment to program, so that single
Piece machine can quickly determine that with the presence or absence of passing zero trigger point, i.e. the electric signal of trigger point becomes positive value from zero or negative value
When point, single-chip microcontroller is by identification this point of passing zero trigger, and by the reference voltage of the self-resonance voltage after shutdown and setting
It is compared, single-chip microcontroller is allowed 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 determination unit 206: recording unit 2062, in determination
The trigger signal be greater than or equal to the described first default trigger signal, and be less than the second default trigger signal when, by institute
It states trigger signal and is determined as the first trigger signal, at the time of recording first trigger signal, by first trigger signal
At the time of lower limit value as the threshold range.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining the first default trigger signal,
The lower limit value of passing zero trigger time has been determined, has improved the control to the passing zero trigger time of IGBT, thereby reduces power consumption.
According to one embodiment of present invention, it is preferable that the recording unit 2062 is also used to, and is determining the triggering letter
Number be greater than or equal to the described second default trigger signal, and be less than the third preset trigger signal when, by the trigger signal
It is determined as the second trigger signal, the duration of second trigger signal is recorded, by continuing for second trigger signal
Time is as passing zero trigger time reference value.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining the second default trigger signal,
The a reference value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
According to one embodiment of present invention, it is preferable that the recording unit 2062 is also used to, and is determining the triggering letter
Number being greater than or equal to the third presets trigger signal, and the trigger signal is determined as third trigger signal, records described the
At the time of three trigger signals, using at the time of the third trigger signal as the upper limit value of the threshold range.
The determination system of the passing zero trigger time of embodiment according to the present invention, by determining that third presets trigger signal,
The upper limit value of passing zero trigger time has been determined, has further increased the control to the passing zero trigger time of IGBT, further
Reduce power consumption.
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 trigger 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 system of the passing zero trigger time of embodiment according to the present invention, by when trigger signal is not detected,
The duty ratio of electric loading signal is improved, namely improves the power for being applied to IGBT, to accelerate the determining passing zero trigger time
Efficiency, wherein the raising of duty ratio can be according to step value is preset, or be tested according to preset power curve,
Until generating 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, the generation of the first trigger signal is judged whether there is,
If so, thening follow the steps 416, if not (as shown in Figure 5), 408 are thened follow the steps；Step 412, the second triggering letter is judged whether there is
Number generate, if so, thening follow the steps 418, if not (as shown in Figure 5), then follow the steps 408；Step 414, is judged whether there is
One trigger signal generates, if so, thening follow the steps 420, if not (as shown in Figure 5), thens follow the steps 408；Step 422, it determines
The threshold range of passing zero trigger time；Step 424, according to passing zero trigger reference voltage and threshold range, IGBT is driven.
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 of passing zero trigger time a kind of and a kind of electromagnetic heater make electromagnetic oven, by detection trigger signal with
First default trigger signal and the second default trigger signal and the size relation with third trigger signal, it is determined that zero passage is led
The range of logical time makes it work in passing zero trigger state as much as possible, and then save to improve the reliability of IGBT
Power consumption, improves reliability, wherein the first default trigger signal corresponds to advanced Continuity signal, the second default trigger signal
Corresponding to passing zero trigger signal, third presets trigger signal and corresponds to lag Continuity signal.
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, is suitable for thyristor switch, the thyristor switch includes emitter, collection
Electrode and base stage, 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；
Judged whether to generate trigger signal according to the sampled signal；
When determining to generate the trigger signal, according to the size relation of the trigger signal and the first default trigger signal, institute
The size relation and the trigger signal and third for stating trigger signal and the second default trigger signal preset the big of trigger signal
Small relationship determines the threshold range of the passing zero trigger time,
Wherein, the described first default trigger signal is less than the described second default trigger signal, and the second default trigger signal is small
Trigger signal is preset in the third.
2. the determination method of passing zero trigger time according to claim 1, which is characterized in that determining to generate the triggering
When signal, according to the size relation of the trigger signal and the first default trigger signal, the trigger signal and the second default touching
The size relation of signalling and the trigger signal and third preset the size relation of trigger signal, determine that the zero passage is led
The threshold range of logical time, comprising the following specific steps
It is determining that the trigger signal is greater than or equal to the described first default trigger signal, and is being less than the described second default triggering letter
Number when, the trigger signal is determined as the first trigger signal, at the time of recording first trigger signal, by described first
Lower limit value at the time of trigger signal as the threshold range.
3. the determination method of passing zero trigger time according to claim 1, which is characterized in that determining to generate the triggering
When signal, according to the size relation of the trigger signal and the first default trigger signal, the trigger signal and the second default touching
The size relation of signalling and the trigger signal and third preset the size relation of trigger signal, determine that the zero passage is led
The threshold range of logical time, also includes the following specific steps:
It is determining that the trigger signal is greater than or equal to the described second default trigger signal, and is being less than the default triggering letter of the third
Number when, the trigger signal is determined as the second trigger signal, records the duration of second trigger signal, will be described
The duration of second trigger signal is as passing zero trigger time reference value.
4. the determination method of passing zero trigger time according to claim 3, which is characterized in that determining to generate the triggering
When signal, according to the size relation of the trigger signal and the first default trigger signal, the trigger signal and the second default touching
The size relation of signalling and the trigger signal and third preset the size relation of trigger signal, determine that the zero passage is led
The threshold range of logical time, also includes the following specific steps:
Determine the trigger signal be greater than or equal to the third preset trigger signal, the trigger signal is determined as third
Trigger signal, at the time of recording the third trigger signal, using at the time of the third trigger signal as the threshold value model
The upper limit value enclosed.
5. the determination method of passing zero trigger time according to any one of claim 1 to 4, which is characterized in that according to institute
Sampled signal is stated to judge whether to generate trigger signal, comprising the following specific steps
When determining not generate the trigger signal, increase the duty ratio of electric loading signal, and the electric loading that duty ratio will be increased
Electric loading signal of the signal as the specified duty ratio.
6. a kind of determination system of passing zero trigger time, is suitable for thyristor switch, the thyristor switch includes emitter, collection
Electrode and base stage, 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 generates trigger signal for judging whether according to the sampled signal；
Determination unit is used for when determining to generate the trigger signal, according to the trigger signal and the first default trigger signal
Size relation, the size relation and the trigger signal and third of the trigger signal and the second default trigger signal be pre-
If the size relation of trigger signal, the threshold range of the passing zero trigger time is determined,
Wherein, the described first default trigger signal is less than the described second default trigger signal, and the second default trigger signal is small
Trigger signal is preset in the third.
7. the determination system of passing zero trigger time according to claim 6, which is characterized in that the determination unit is also wrapped
It includes:
Recording unit for determining that the trigger signal is greater than or equal to the described first default trigger signal, and is less than described
When the second default trigger signal, the trigger signal is determined as the first trigger signal, record first trigger signal when
Carve, using at the time of first trigger signal as the lower limit value of the threshold range.
8. the determination system of passing zero trigger time according to claim 7, which is characterized in that the recording unit is also used
In determining that the trigger signal is greater than or equal to the described second default trigger signal, and be less than the default triggering letter of the third
Number when, the trigger signal is determined as the second trigger signal, records the duration of second trigger signal, will be described
The duration of second trigger signal is as passing zero trigger time reference value.
9. the determination system of passing zero trigger time according to claim 8, which is characterized in that the recording unit is also used
In, determine the trigger signal be greater than or equal to the third preset trigger signal, the trigger signal is determined as third
Trigger signal, at the time of recording the third trigger signal, using at the time of the third trigger signal as the threshold value model
The upper limit value enclosed.
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 increasing the duty ratio of electric loading signal when determining not generate the trigger signal, and increase is accounted for
Electric loading signal of the electric loading signal of empty ratio 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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| JP4978062B2 (en) * | 2006-06-02 | 2012-07-18 | パナソニック株式会社 | Power control apparatus for high frequency dielectric heating and control method thereof |
| DE112010006045B4 (en) * | 2010-12-03 | 2024-06-20 | MITSUI E&S Co., Ltd. | Induction heating device, induction heating method and program |
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