CN103813556B - Electromagnetic heater and Poewr control method thereof and power control system - Google Patents
Electromagnetic heater and Poewr control method thereof and power control system Download PDFInfo
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- CN103813556B CN103813556B CN201410053453.0A CN201410053453A CN103813556B CN 103813556 B CN103813556 B CN 103813556B CN 201410053453 A CN201410053453 A CN 201410053453A CN 103813556 B CN103813556 B CN 103813556B
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Abstract
The invention provides a kind of Poewr control method, comprising: detect the operating current that described electromagnetic heater is current; When described operating current miss the mark electric current, described operating current is adjusted to described target current; And when described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater; Described operating frequency and target frequency are compared, according to comparative result, described target current is compensated, to obtain new target current; Described operating current is adjusted to described new target current.Correspondingly, present invention also offers a kind of power control system and electromagnetic heater.By technical scheme of the present invention, the error of current sample can be reduced, put forward high-power consistency.
Description
Technical field
The present invention relates to electromagnetic heating technique field, in particular to a kind of Poewr control method of electromagnetic heater, power control system and a kind of electromagnetic heater.
Background technology
In current Electromagnetic Heating product, part adopts flowing through IGBT(transistor) mode of current detecting carrys out detection power, power is controlled by the electric current flowing through IGBT, but in current detecting process, easily be subject to the impacts such as resistance, electric capacity, amplifier, electromagnetic interference, cause current detecting error large, and then cause power error large.
Therefore, how to reduce the error of current detecting, realize power consistency, become technical problem urgently to be resolved hurrily at present.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.
For this reason, one object of the present invention is the Poewr control method proposing a kind of electromagnetic heater.
Another object of the present invention is the power control system proposing a kind of electromagnetic heater.
Another object of the present invention is to propose a kind of electromagnetic heater.
For achieving the above object, embodiment according to a first aspect of the invention, proposes a kind of Poewr control method, comprising: detect the operating current that described electromagnetic heater is current; When described operating current miss the mark electric current, described operating current is adjusted to described target current; And when described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater; Described operating frequency and target frequency are compared, according to comparative result, described target current is compensated, to obtain new target current; Described operating current is adjusted to described new target current.
Poewr control method according to an embodiment of the invention, when operating current reaches target current, the operating frequency of transistor in further detection electromagnetic heater, and this operating frequency and target frequency are compared, according to comparative result, target current is necessarily compensated, and then the new target current after being compensated, thus reduce the error of current sample, put forward high-power consistency.
Wherein, the operating current that electromagnetic heater is current both can be the electric current that electrical network is input to whole electromagnetic heater, can be again the electric current flow through in transistor.
In addition, Poewr control method according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, when described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater, specifically comprise: described operating current and described target current are compared; When the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
Poewr control method according to an embodiment of the invention, when operating current equals target current, or when operating current and target current difference is between the two less than a certain set point, now can think that operating current reaches target current, now obtain the operating frequency of transistor again, and then target current is compensated, thus reduce the sampling error of electric current.
According to one embodiment of present invention, described operating current is adjusted to described target current, specifically comprises: when described operating current is less than described target current, increase the duty ratio exporting the control signal of described transistor to; When described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
Poewr control method according to an embodiment of the invention, the operating current of electromagnetic heater can be regulated by the duty ratio of regulating impulse signal, when operating current is less than target current, increase the duty ratio of pulse signal, improve power, increase operating current, make operating current reach target current, when operating current is greater than target current, reduce the duty ratio of pulse signal, reduce power, reduction operating current, makes operating current reach target current or difference is less than a certain set point.
According to one embodiment of present invention, described operating frequency and target frequency are compared, according to comparative result, described target current is compensated, to obtain new target current, specifically comprise: described operating frequency and described target frequency are compared, when described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and when described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
According to one embodiment of present invention, when described operating frequency is greater than described target frequency, go out described new target current according to following formulae discovery: I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And when described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery: I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
Poewr control method according to an embodiment of the invention, when operating current reaches target current, detects current operating frequency, when operating frequency is higher than target frequency, calculates the poor (f of frequency-splitting f of operating frequency and target frequency
difference=operating frequency-target frequency), according to frequency-splitting f
differencewith certain proportion T, target current is compensated, namely new target current I
newly=I+f
difference/ T (T: proportionality coefficient) (T is program preset value), now, increases the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, improve power; When operating frequency is lower than target frequency, calculate the frequency-splitting f of operating frequency and target frequency
difference(f
difference=target frequency-operating frequency), target current is compensated with certain proportion according to frequency-splitting, new target current I
newly=I-f
difference/ T, now, reduces the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, reduce power.Like this, according to frequency, target current is compensated to the error reducing current sample, improve power consistency.Wherein, according to frequency, target current is compensated and can be carried out once, also can carry out repeatedly according to above-mentioned principle.Then carry out record after the target current that each formation is new, and cover former target current.
Embodiment according to a second aspect of the invention, also proposed a kind of power control system of electromagnetic heater, for electromagnetic heater, comprising: detecting unit, for detecting the current operating current of described electromagnetic heater; Processing unit, for when described operating current miss the mark electric current, is adjusted to described target current by described operating current, and when described operating current reaches described target current, obtains the operating frequency of transistor in described electromagnetic heater; Described processing unit also for: described operating frequency and target frequency are compared, according to comparative result, described target current are compensated, to obtain new target current, and described operating current is adjusted to described new target current.
Power control system according to an embodiment of the invention, when operating current reaches target current, by detecting the operating frequency of transistor in electromagnetic heater, and this operating frequency and target frequency are compared, according to comparative result, target current is necessarily compensated, and then the new target current after being compensated, thus reduce the error of current sample, put forward high-power consistency.
Wherein, the operating current that electromagnetic heater is current both can be the electric current that electrical network is input to whole electromagnetic heater, can be again the electric current flow through in transistor.
In addition, the power control system of electromagnetic heater according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, described processing unit comprises: compare subelement, described operating current and described target current is compared; Judge subelement, when the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
Power control system according to an embodiment of the invention, when operating current equals target current, or when operating current and target current difference is between the two less than a certain set point, now can think that operating current reaches target current, now obtain the operating frequency of transistor again, and then target current is compensated, thus reduce the sampling error of electric current.
According to one embodiment of present invention, described processing unit also comprises: control subelement, when described operating current is less than described target current, increases the duty ratio exporting the control signal of described transistor to; And when described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
Power control system according to an embodiment of the invention, the operating current of electromagnetic heater can be regulated by the duty ratio of regulating impulse signal, when operating current is less than target current, increase the duty ratio of pulse signal, improve power, increase operating current, make operating current reach target current, when operating current is greater than target current, reduce the duty ratio of pulse signal, reduce power, reduction operating current, makes operating current reach target current or difference is less than a certain set point.
According to one embodiment of present invention, described compare subelement also for: described operating frequency and described target frequency are compared; Described control subelement also for: when described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and when described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
According to one embodiment of present invention, when described operating frequency is greater than described target frequency, go out described new target current according to following formulae discovery: I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And when described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery: I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
Power control system according to an embodiment of the invention, when operating current reaches target current, detects current operating frequency, when operating frequency is higher than target frequency, calculates the frequency-splitting f of operating frequency and target frequency
difference(f
difference=operating frequency-target frequency), according to frequency-splitting f
differencewith certain proportion T, target current is compensated, namely new target current I
newly=I+f
difference/ T (T: proportionality coefficient) (T is program preset value), now, increases the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, improve power; When operating frequency is lower than target frequency, calculate the frequency-splitting f of operating frequency and target frequency
difference(f
difference=target frequency-operating frequency), target current is compensated with certain proportion according to frequency-splitting, new target current I
newly=I-f
difference/ T, now, reduces the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, reduce power.Like this, according to frequency, target current is compensated to the error reducing current sample, improve power consistency.Wherein, according to frequency, target current is compensated and can be carried out once, also can carry out repeatedly according to above-mentioned principle.Then carry out record after the target current that each formation is new, and cover former target current.
Embodiment according to a third aspect of the invention we, also proposed a kind of electromagnetic heater, comprising: transistor: and the power control system according to any one of technique scheme, described power control system is connected with described transistor.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the flow chart of Poewr control method according to an embodiment of the invention;
Fig. 2 shows the block diagram of power control system according to an embodiment of the invention;
Fig. 3 shows the particular flow sheet of Poewr control method according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 shows the flow chart of Poewr control method according to an embodiment of the invention.
As shown in Figure 1, Poewr control method according to an embodiment of the invention, comprising: step 102, detects the operating current that described electromagnetic heater is current; Step 104, when described operating current miss the mark electric current, is adjusted to described target current by described operating current; And step 106, when described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater; Step 108, compares described operating frequency and target frequency, compensates described target current according to comparative result, to obtain new target current; Step 110, is adjusted to described new target current by described operating current.Wherein, the operating frequency of described transistor refers to and controls the frequency of signal of transistor or the switching frequency in the transistor monocycle.
Poewr control method according to an embodiment of the invention, when operating current reaches target current, the operating frequency of transistor in further detection electromagnetic heater, and this operating frequency and target frequency are compared, according to comparative result, target current is necessarily compensated, and then the new target current after being compensated, thus reduce the error of current sample, revise power higher or on the low side, prevent the different product phenomenon that emergent power is inconsistent under identical operating current, thus put forward high-power consistency.
Wherein, the operating current that electromagnetic heater is current both can be the electric current that electrical network is input to whole electromagnetic heater, can be again the electric current flow through in transistor.
In addition, Poewr control method according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, described step 106 specifically comprises: described operating current and described target current are compared; When the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
Poewr control method according to an embodiment of the invention, when operating current equals target current, or when operating current and target current difference is between the two less than a certain set point, it can be the value of the positive and negative deviation 5% of target current as this set point, now can think that operating current reaches target current, now obtain the operating frequency of transistor again, and then target current is compensated, thus reduce the sampling error of electric current.
According to one embodiment of present invention, described step 104 specifically comprises: when described operating current is less than described target current, increases the duty ratio exporting the control signal of described transistor to; When described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
Poewr control method according to an embodiment of the invention, the operating current of electromagnetic heater can be regulated by the duty ratio of regulating impulse signal, when operating current is less than target current, increase the duty ratio of pulse signal, improve power, increase operating current, make operating current reach target current, when operating current is greater than target current, reduce the duty ratio of pulse signal, reduce power, reduction operating current, makes operating current reach target current or difference is less than a certain set point.
According to one embodiment of present invention, described step 108 specifically comprises: described operating frequency and described target frequency are compared, when described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and when described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
According to one embodiment of present invention, when described operating frequency is greater than described target frequency, go out described new target current according to following formulae discovery: I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And when described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery: I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
Poewr control method according to an embodiment of the invention, when operating current reaches target current, detects current operating frequency, when operating frequency is higher than target frequency, calculates the frequency-splitting f of operating frequency and target frequency
difference(f
difference=operating frequency-target frequency), according to frequency-splitting f
differencewith certain proportion T, target current is compensated, namely new target current I
newly=I+f
difference/ T (T: proportionality coefficient) (T is program preset value), now, increases the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, improve power; When operating frequency is lower than target frequency, calculate the frequency-splitting f of operating frequency and target frequency
difference(f
difference=target frequency-operating frequency), target current is compensated with certain proportion according to frequency-splitting, new target current I
newly=I-f
difference/ T, now, reduces the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, reduce power.Like this, according to frequency, target current is compensated to the error reducing current sample, improve power consistency.Wherein, according to frequency, target current is compensated and can be carried out once, also can carry out repeatedly according to above-mentioned principle.Then carry out record after the target current that each formation is new, and cover former target current.
Fig. 2 shows the block diagram of power control system according to an embodiment of the invention.
As shown in Figure 2, power control system 200 comprises according to an embodiment of the invention: detecting unit 202, for detecting the current operating current of described electromagnetic heater; Processing unit 204, for when described operating current miss the mark electric current, is adjusted to described target current by described operating current, and when described operating current reaches described target current, obtains the operating frequency of transistor in described electromagnetic heater; Described processing unit 204 also for: described operating frequency and target frequency are compared, according to comparative result, described target current are compensated, to obtain new target current, and described operating current is adjusted to described new target current.
Power control system according to an embodiment of the invention, when operating current reaches target current, by detecting the operating frequency of transistor in electromagnetic heater, and this operating frequency and target frequency are compared, according to comparative result, target current is necessarily compensated, and then the new target current after being compensated, thus reduce the error of current sample, put forward high-power consistency.
Wherein, the operating current that electromagnetic heater is current both can be the electric current that electrical network is input to whole electromagnetic heater, can be again the electric current flow through in transistor.
In addition, power control system according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, described processing unit 204 comprises: compare subelement 2042, described operating current and described target current is compared; Judge subelement 2044, when the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
Power control system according to an embodiment of the invention, when operating current equals target current, or when operating current and target current difference is between the two less than a certain set point, now can think that operating current reaches target current, now obtain the operating frequency of transistor again, and then target current is compensated, thus reduce the sampling error of electric current.
According to one embodiment of present invention, described processing unit 204 also comprises: control subelement 2046, controls subelement 2046 for when described operating current is less than described target current, increases the duty ratio exporting the control signal of described transistor to; When described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
Power control system according to an embodiment of the invention, the operating current of electromagnetic heater can be regulated by the duty ratio of regulating impulse signal, when operating current is less than target current, increase the duty ratio of pulse signal, improve power, increase operating current, make operating current reach target current, when operating current is greater than target current, reduce the duty ratio of pulse signal, reduce power, reduction operating current, makes operating current reach target current or difference is less than a certain set point.
According to one embodiment of present invention, described compare subelement 2042 also for: described operating frequency and described target frequency are compared; Described control subelement 2046 also for: when described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and when described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
According to one embodiment of present invention, when described operating frequency is greater than described target frequency, go out described new target current according to following formulae discovery: I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And when described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery: I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
Power control system according to an embodiment of the invention, when operating current reaches target current, detects current operating frequency, when operating frequency is higher than target frequency, calculates the frequency-splitting f of operating frequency and target frequency
difference(f
difference=operating frequency-target frequency), according to frequency-splitting f
differencewith certain proportion T, target current is compensated, namely new target current I
newly=I+f
difference/ T (T: proportionality coefficient) (T is program preset value), now, increases the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, improve power; When operating frequency is lower than target frequency, calculate the frequency-splitting f of operating frequency and target frequency
difference(f
difference=target frequency-operating frequency), target current is compensated with certain proportion according to frequency-splitting, new target current I
newly=I-f
difference/ T, now, reduces the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, reduce power.Like this, according to frequency, target current is compensated to the error reducing current sample, improve power consistency.Wherein, according to frequency, target current is compensated and can be carried out once, also can carry out repeatedly according to above-mentioned principle.Then carry out record after the target current that each formation is new, and cover former target current.
Fig. 3 shows the particular flow sheet of Poewr control method according to an embodiment of the invention.
As shown in Figure 3, the idiographic flow of Poewr control method is as follows according to an embodiment of the invention:
Step 302, detects the operating current I that electromagnetic heater is current
work.
Step 304, reads the target current I preset.
Step 306, compares operating current and target current, judges whether I>=I
work.When judged result is no, enters step 308, when judged result is for being, entering step 310.
Step 308, operating current I
workwhen being greater than target current I, judging whether the difference of operating current and target current is greater than preset difference value K, when judged result is for being, enters step 314, when judged result is no, entering step 316.
Step 310, target current I is greater than operating current I
worktime, judging whether the difference of target current and operating current is more than or equal to preset difference value K, when judged result is for being, enters step 312, when judged result is no, entering step 316.
Step 312, when target current I is greater than operating current I
worktime, increase the duty ratio of transistor, improve power, increase operating current, make operating current reach target current.
Step 314, as operating current I
workwhen being greater than target current I, reduce the duty ratio of transistor, reduce power, reduce operating current, make operating current reach target current.
Step 316, detects the operating frequency of transistor.
Step 318, reads the target frequency preset.
Step 320, compares operating frequency and target frequency, judges whether operating frequency is greater than target frequency, when judged result is for being, entering step 322, when judged result is no, entering step 324.
Step 322, when operating frequency A is greater than target frequency B, calculates the frequency-splitting f of operating frequency and target frequency
difference(f
difference=A-B), target current is compensated with certain proportion according to frequency-splitting, new target current: I
newly=I+f
difference/ T (T: proportionality coefficient), now, increases the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, improve power.
Step 324, when operating frequency is lower than target frequency, calculates the frequency-splitting f of operating frequency and target frequency
difference(f
difference=B-A), target current is compensated with certain proportion according to frequency-splitting, new target current I
newly=I-f
difference/ T (T: proportionality coefficient), now, reduces the duty ratio exporting the pulse signal of transistor to, makes the target current that operating current reaches new, reduce power.
Like this, according to frequency, target current is compensated to the error reducing current sample, improve power consistency.Wherein, according to frequency, target current is compensated and can be carried out once, also can carry out repeatedly according to above-mentioned principle.
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, the error of current sample can have been reduced, put forward high-power consistency.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a Poewr control method for electromagnetic heater, is characterized in that, comprising:
Detect the operating current that described electromagnetic heater is current;
When described operating current miss the mark electric current, described operating current is adjusted to described target current; And
When described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater;
Described operating frequency and target frequency are compared, according to comparative result, described target current is compensated, to obtain new target current;
Described operating current is adjusted to described new target current.
2. Poewr control method according to claim 1, is characterized in that, when described operating current reaches described target current, obtains the operating frequency of transistor in described electromagnetic heater, specifically comprises:
Described operating current and described target current are compared;
When the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
3. Poewr control method according to claim 1, is characterized in that, described operating current is adjusted to described target current, specifically comprises:
When described operating current is less than described target current, increase the duty ratio exporting the control signal of described transistor to;
When described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
4. Poewr control method according to claim 1, is characterized in that, described operating frequency and target frequency is compared, and compensates described target current according to comparative result, to obtain new target current, specifically comprises:
Described operating frequency and described target frequency are compared, when described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and
When described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
5. Poewr control method according to claim 4, is characterized in that, when described operating frequency is greater than described target frequency, goes out described new target current according to following formulae discovery:
I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And
When described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery:
I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
6. a power control system for electromagnetic heater, is characterized in that, comprising:
Detecting unit, for detecting the current operating current of described electromagnetic heater;
Processing unit, be connected to described detecting unit, for when described operating current miss the mark electric current, described operating current be adjusted to described target current, and when described operating current reaches described target current, obtain the operating frequency of transistor in described electromagnetic heater;
Described processing unit also for:
Described operating frequency and target frequency are compared, according to comparative result, described target current is compensated, to obtain new target current, and described operating current is adjusted to described new target current.
7. power control system according to claim 6, is characterized in that, described processing unit comprises:
Relatively subelement, for comparing described operating current and described target current;
Judge subelement, for when the difference of described operating current and described target current is in preset range, is judged to be that described operating current reaches target current, and obtains described operating frequency.
8. power control system according to claim 7, is characterized in that, described processing unit also comprises:
Control subelement, for when described operating current is less than described target current, increase the duty ratio exporting the control signal of described transistor to; And when described operating current is greater than described target current, reduce the duty ratio exporting the control signal of described transistor to.
9. power control system according to claim 8, is characterized in that, described compare subelement also for:
Described operating frequency and described target frequency are compared;
Described control subelement also for:
When described operating frequency is greater than described target frequency, according to frequency-splitting and the default proportionality coefficient of described operating frequency and described target frequency, increase described target current, to obtain described new target current, and
When described operating frequency is less than described target frequency, according to frequency-splitting and the default proportionality coefficient of described target frequency and described operating frequency, reduce described target current, to obtain described new target current.
10. power control system according to claim 9, is characterized in that, when described operating frequency is greater than described target frequency, goes out described new target current according to following formulae discovery:
I
newly=I+f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described operating frequency and described target frequency, T is default proportionality coefficient; And
When described operating frequency is less than described target frequency, go out described new target current according to following formulae discovery:
I
newly=I-f
difference/ T, wherein, I
newlyfor described new target current, I is described target current, f
differencefor the frequency-splitting of described target frequency and described operating frequency, T is default proportionality coefficient.
11. 1 kinds of electromagnetic heaters, is characterized in that, comprising:
Transistor: and
Power control system according to any one of claim 6 to 10, described power control system is connected with described transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053453.0A CN103813556B (en) | 2014-02-17 | 2014-02-17 | Electromagnetic heater and Poewr control method thereof and power control system |
Applications Claiming Priority (1)
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| CN107807275B (en) * | 2016-09-08 | 2024-04-12 | 广东美的生活电器制造有限公司 | Power deviation value correction device and method |
| CN108575001B (en) * | 2017-03-13 | 2021-12-21 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and power control method and device thereof |
| CN109548208B (en) * | 2017-09-22 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker and control method and control device thereof |
| CN109688649B (en) * | 2017-10-19 | 2021-02-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, electromagnetic heating system and control method and device thereof |
| CN109842968B (en) * | 2017-11-29 | 2021-09-21 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and heating control method and device thereof |
| CN110366283B (en) * | 2018-04-11 | 2022-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and power control method and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1279376A (en) * | 1999-06-30 | 2001-01-10 | 东芝株式会社 | Heating cooker |
| CN102711297A (en) * | 2011-03-28 | 2012-10-03 | 三星电子株式会社 | Control method of induction heating cooker |
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| JP4748356B2 (en) * | 2005-10-13 | 2011-08-17 | サンケン電気株式会社 | Induction heating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1279376A (en) * | 1999-06-30 | 2001-01-10 | 东芝株式会社 | Heating cooker |
| CN102711297A (en) * | 2011-03-28 | 2012-10-03 | 三星电子株式会社 | Control method of induction heating cooker |
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