CN104244481B - The method for heating and controlling of electromagnetic induction heater and electromagnetic induction heater - Google Patents
The method for heating and controlling of electromagnetic induction heater and electromagnetic induction heater Download PDFInfo
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- CN104244481B CN104244481B CN201310238922.1A CN201310238922A CN104244481B CN 104244481 B CN104244481 B CN 104244481B CN 201310238922 A CN201310238922 A CN 201310238922A CN 104244481 B CN104244481 B CN 104244481B
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Abstract
The invention discloses a kind of method for heating and controlling of electromagnetic induction heater, wherein, described electromagnetic induction heater comprises power switch, and described method comprises the steps: S1, detects the electric current of described power switch in real time; S2, when the average current of power switch is more than or equal to the first current threshold, controls after described electromagnetic induction heater carries out heating first preset time T 1 with described first current threshold, to reduce the duty ratio of the signal controlling described power switch; S3, when described average current is less than or equal to the second current threshold, control after described electromagnetic induction heater carries out heating second preset time T 2 with described second current threshold, improve the duty ratio of the signal controlling described power switch, wherein, described second current threshold is less than described first current threshold.This method for heating and controlling effectively can reduce the temperature rise of power switch, without the need to increasing cost, practical.The invention also discloses a kind of electromagnetic induction heater.
Description
Technical field
The present invention relates to electromagnetic induction heating technology field, particularly a kind of method for heating and controlling of electromagnetic induction heater and a kind of electromagnetic induction heater.
Background technology
Current electromagnetic induction heater such as electromagnetic oven is reducing the IGBT (InsulatedGateBipolarTransistor of electromagnetic oven, insulated gate bipolar transistor) in temperature rise solution, mainly take to strengthen radiator, increase fan delivery, change these measures of air channel realize.Although these methods also can reduce IGBT temperature rise, strengthen radiator, increase fan delivery can increase cost, change air channel does not have again rule to seek, and different types needs to make different amendments, and increase the complexity of work, production cost is high.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this reason, the present invention need to propose a kind of effectively can reduce power switch temperature rise, without the need to increase cost electromagnetic induction heater and method for heating and controlling.
For achieving the above object, the method for heating and controlling of a kind of electromagnetic induction heater of the embodiment proposition of one aspect of the present invention, wherein, described electromagnetic induction heater comprises power switch, described method comprises the steps: S1, detects the electric current of described power switch in real time; S2, the average current of power switch according to the described Current calculation presetting the secondary described power switch detected, when described average current is more than or equal to the first current threshold, control after described electromagnetic induction heater carries out heating first preset time T 1 with described first current threshold, to reduce the duty ratio of the signal controlling described power switch; S3, when described average current is less than or equal to the second current threshold, control after described electromagnetic induction heater carries out heating second preset time T 2 with described second current threshold, improve the duty ratio of the signal controlling described power switch, wherein, described second current threshold is less than described first current threshold.
According to the method for heating and controlling of the electromagnetic induction heater of the embodiment of the present invention, the fluctuation of the heating power of electromagnetic induction heater is realized by the service time of the control break power switch single when electromagnetic induction heater works, effectively can reduce the temperature rise of power switch, control method of the present invention is applicable to the electromagnetic induction heater of any type, highly versatile.In addition, this method for heating and controlling is simple.
In one embodiment of the invention, 0 minute≤T1≤5 minute, 0 minute≤T2≤5 minute.
Wherein, in described step S2 and S3, the average heating power controlling described electromagnetic induction heater is within the scope of the default positive and negative deviation of rated power.
In one embodiment of the invention, described default positive and negative deviation scope is 5% ~-20%.
In one embodiment of the invention, described default time is 5 ~ 20 times.
In an embodiment of the present invention, described first current threshold is the current value corresponding when being in maximum overgauge of described rated power, and described second current threshold is the current value corresponding when being in minimal negative deviation of described rated power.
For achieving the above object, a kind of electromagnetic induction heater that the present invention's embodiment on the other hand proposes, comprising: power switch, current detection module, described current detection module is connected with described power switch, for detecting the electric current of described power switch, driver module, described driver module is connected with described power switch, control module, described control module is connected with described current detection module respectively with described driver module, described control module presets the average current of power switch described in time Current calculation of the described power switch of detection according to described current detection module, the first control signal is exported to control the service time of described power switch when described average current is more than or equal to the first current threshold, and after described first control signal keeps the first preset time T 1 with identical duty ratio, described control module reduces the duty ratio of described first control signal, and export the second control signal when described average current is less than or equal to the second current threshold to control the service time of described power switch, and after described second control signal keeps the second preset time T 2 with identical duty ratio, described control module improves the duty ratio of described second control signal, wherein, described second current threshold is less than described first current threshold.
According to the electromagnetic induction heater of the embodiment of the present invention, the fluctuation of the heating power of electromagnetic induction heater is realized by the service time of the control module control break power switch single when electromagnetic induction heater works, effectively can either reduce the temperature rise of power switch, again without the need to increasing the complexity of work, reduce production cost, and be applicable to the electromagnetic induction heater of any type, highly versatile.
In one embodiment of the invention, 0 minute≤T1≤5 minute, 0 minute≤T2≤5 minute.
Wherein, the average heating power that described control module controls described electromagnetic induction heater is within the scope of the default positive and negative deviation of rated power.
In one embodiment of the invention, described default positive and negative deviation scope is 5% ~-20%.
In an embodiment of the present invention, described first current threshold is the current value corresponding when being in maximum overgauge of described rated power, and described second current threshold is the current value corresponding when being in minimal negative deviation of described rated power.
The aspect that the present invention adds 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
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the method for heating and controlling of electromagnetic induction heater according to the embodiment of the present invention;
Fig. 2 is the flow chart of the method for heating and controlling of electromagnetic oven according to the present invention's specific embodiment; And
Fig. 3 is the structural representation of the electromagnetic induction heater according to the embodiment of the present invention.
Reference numeral:
Power switch 10, current detection module 20, driver module 30 and control module 40, heating module 50.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
With reference to description below and accompanying drawing, these and other aspects of embodiments of the invention will be known.Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
Method for heating and controlling and the electromagnetic induction heater of the electromagnetic induction heater proposed according to the embodiment of the present invention are described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the method for heating and controlling of electromagnetic induction heater according to the embodiment of the present invention.Wherein, as shown in Figure 1, electromagnetic induction heater comprises power switch, and the method for heating and controlling of this electromagnetic induction heater comprises the steps:
S1, the electric current of real-time detection power switch.
In one embodiment of the invention, power switch can be IGBT.
S2, according to the average current of the Current calculation power switch of the default secondary power switch detected, when average current is more than or equal to the first current threshold, after control electromagnetic induction heater carries out heating first preset time T 1 with the first current threshold, reduce the duty ratio of the signal controlling power switch.In an example of the present invention, presetting secondary is 5 ~ 20 times.
Wherein, 0 minute≤T1≤5 minute, preferably, T1 can be 2 minutes.Further, in this step S2, the average heating power controlling electromagnetic induction heater is needed to be within the scope of the default positive and negative deviation of rated power.In an example of the present invention, presetting positive and negative deviation scope can be 5% ~-20%, and such as, the overgauge of rated power can be 5% of rated power, and the minus deviation of rated power can be-10% of rated power.
Further, in an embodiment of the present invention, first current threshold is the current value corresponding when being in maximum overgauge of rated power, such as, first current threshold can current value corresponding to P1=Pe (1+5%), wherein, P1 is the accessible maximum power of this electromagnetic induction heater.
S3, when average current is less than or equal to the second current threshold, after control electromagnetic induction heater carries out heating second preset time T 2 with the second current threshold, improve the duty ratio of the signal controlling power switch, wherein, the second current threshold is less than the first current threshold.
Wherein, 0 minute≤T2≤5 minute, preferably, T2 also can be 2 minutes.Further, in this step S3, the average heating power controlling electromagnetic induction heater is needed to be within the scope of the default positive and negative deviation of rated power equally.
Further, in an embodiment of the present invention, second current threshold is the current value corresponding when being in minimal negative deviation of rated power, such as, second current threshold can current value corresponding to P2=Pe (1-10%), wherein, P2 is the accessible minimum power of this electromagnetic induction heater.
Particularly, in one embodiment of the invention, as shown in Figure 2, above-mentioned electromagnetic induction heater is electromagnetic oven, and the method for heating and controlling of electromagnetic oven realizes based on the control circuit of electromagnetic oven, specifically comprises the steps:
S201, starts.Open electromagnetic oven and carry out heating work.
The electric current of S202, repeated detection IGBT, and the average current calculating IGBT.
S203, judges whether the average current of current I GBT is more than or equal to the first current value.If so, step S204 is performed; If not, step S210 is performed.
S204, controls electromagnetic oven and heats with the first current threshold.
S205, judges whether heating time reaches T1.If so, step S206 is performed; If not, return step S205 to continue to judge.
S206, controls electromagnetic oven and falls power heating.That is, namely the duty ratio reducing the signal of control IGBT controls progressively to diminish to reduce to the pulse duration of IGBT the time that IGBT single opens, and the heating power of electromagnetic oven is reduced gradually.
S207, judges whether the average current of current I GBT is less than or equal to the second current value.If so, step S208 is performed; If not, step S206 is returned.
S208, controls electromagnetic oven and heats with the second current threshold.
S209, judges whether heating time reaches T2.If so, step S210 is performed; If not, return step S209 to continue to judge.
S210, controls the heating of electromagnetic oven power per liter.That is, namely the duty ratio improving the signal of control IGBT controls progressively to increase to increase to the pulse duration of IGBT the time that IGBT single opens, and the heating power of electromagnetic oven is raised gradually.Further, be heated to detect that the average current of current I GBT repeats above-mentioned steps after being more than or equal to the first current threshold, namely get back to step S203 and continue to judge.
It should be noted that, method for heating and controlling of the present invention can be applicable to multiple employing IGBT as in the electrical equipment of power switch, is specially adapted in the electromagnetic induction heaters such as electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
According to the method for heating and controlling of the electromagnetic induction heater of the embodiment of the present invention, realized the fluctuation of the heating power of electromagnetic induction heater by the service time of the control break power switch single when electromagnetic induction heater works, effectively can reduce the temperature rise of power switch.In addition, this method for heating and controlling is simple, and is applicable to the electromagnetic induction heater of any type, highly versatile, is particularly useful for the household electrical appliance that electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker etc. adopt Electromagnetic Heating.
Fig. 3 is the structural representation of the electromagnetic induction heater according to the embodiment of the present invention.As shown in Figure 3, this electromagnetic induction heater comprises power switch 10, heating module 50, current detection module 20, driver module 30 and control module 40.
Wherein, heating module 50 is connected with power switch 10, and current detection module 20 is connected with power switch 10, for the electric current of detection power switch 10.Driver module 30 is connected with power switch 10, control module 40 is connected with current detection module 20 respectively with driver module 30, control module 40 presets time average current of the Current calculation power switch 10 of the power switch 10 of detection according to current detection module 20, the first control signal is exported to control the service time of power switch 10 when average current is more than or equal to the first current threshold, and after described first control signal keeps the first preset time T 1 with identical duty ratio, control module 40 reduces the duty ratio of the first control signal, and export the second control signal when average current is less than or equal to the second current threshold to control the service time of power switch 10, and after the second control signal keeps the second preset time T 2 with identical duty ratio, control module 40 improves the duty ratio of the second control signal, wherein, second current threshold is less than the first current threshold.
In one embodiment of the invention, as shown in Figure 3, power switch 10 can be IGBT, and control module 40 can be single-chip microcomputer, and this electromagnetic induction heater can be electromagnetic oven.The output of IGBT drive module connects the G pole of IGBT, and input connects single-chip microcomputer, and the input of current detection module 20 connects the E pole of IGBT, and output connects single-chip microcomputer, and the C pole of IGBT connects heating module 50.
When current detection module 20 detects that the E pole average current of IGBT is more than or equal to the first current threshold, after Single-chip Controlling heating module keeps the first current threshold to heat a period of time T1, the pulse duration that Single-chip Controlling IGBT drive module exports to IGBT progressively diminishes to reduce the time that IGBT single is opened, and the power of electromagnetic oven is reduced gradually;
When current detection module 20 detects that the E pole average current of IGBT is less than or equal to the second current threshold, after Single-chip Controlling heating module keeps the second current threshold to heat a period of time T2, Single-chip Controlling IGBT drive module is exported to IGBT pulse duration and is progressively increased to increase the time that IGBT single opens, power is raised gradually, heating until current detection module detects that the E pole average current of IGBT is more than or equal to the first current threshold, thus carries out loop control.
Wherein, 0 minute≤T1≤5 minute, 0 minute≤T2≤5 minute, preferably, T1 can be 2 minutes, and T2 also can be 2 minutes.Further, control module 40 needs the average heating power controlling electromagnetic induction heater to be within the scope of the default positive and negative deviation of rated power.In an example of the present invention, presetting positive and negative deviation scope can be 5% ~-20%, and such as, the overgauge of rated power can be 5% of rated power, and the minus deviation of rated power can be-10% of rated power.
Further, in an embodiment of the present invention, first current threshold is the current value corresponding when being in maximum overgauge of rated power, such as, first current threshold can current value corresponding to P1=Pe (1+5%), wherein, P1 is the accessible maximum power of this electromagnetic induction heater.Second current threshold is the current value corresponding when being in minimal negative deviation of rated power, and such as, the second current threshold can current value corresponding to P2=Pe (1-10%), and wherein, P2 is the accessible minimum power of this electromagnetic induction heater.
According to the electromagnetic induction heater of the embodiment of the present invention, the fluctuation of the heating power of heating module is realized by the service time of the control module control break power switch single when electromagnetic induction heater works, effectively can either reduce the temperature rise of power switch, again without the need to increasing the complexity of work, reduce production cost, and be applicable to the electromagnetic induction heater of any type, highly versatile.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (11)
1. a method for heating and controlling for electromagnetic induction heater, is characterized in that, described electromagnetic induction heater comprises power switch, and described method comprises the steps:
S1, detects the electric current of described power switch in real time;
S2, the average current of power switch according to the Current calculation of the default secondary described power switch detected, when described average current is more than or equal to the first current threshold, control after described electromagnetic induction heater carries out heating first preset time T 1 with described first current threshold, to reduce the duty ratio of the signal controlling described power switch;
S3, when described average current is less than or equal to the second current threshold, control after described electromagnetic induction heater carries out heating second preset time T 2 with described second current threshold, improve the duty ratio of the signal controlling described power switch, wherein, described second current threshold is less than described first current threshold.
2. method for heating and controlling as claimed in claim 1, is characterized in that, 0 minute≤T1≤5 minute, 0 minute≤T2≤5 minute.
3. method for heating and controlling as claimed in claim 1, it is characterized in that, in described step S2 and S3, the average heating power controlling described electromagnetic induction heater is within the scope of the default positive and negative deviation of rated power.
4. method for heating and controlling as claimed in claim 3, it is characterized in that, described default positive and negative deviation scope is 5% ~-20%.
5. method for heating and controlling as claimed in claim 1, is characterized in that, described default time is 5 ~ 20 times.
6. method for heating and controlling as claimed in claim 3, it is characterized in that, described first current threshold is the current value corresponding when being in maximum overgauge of described rated power, and described second current threshold is the current value corresponding when being in minimal negative deviation of described rated power.
7. an electromagnetic induction heater, is characterized in that, comprising:
Power switch;
Current detection module, described current detection module is connected with described power switch, for detecting the electric current of described power switch;
Driver module, described driver module is connected with described power switch;
Control module, described control module is connected with described current detection module respectively with described driver module, described control module presets the average current of power switch described in time Current calculation of the described power switch of detection according to described current detection module, the first control signal is exported to control the service time of described power switch when described average current is more than or equal to the first current threshold, and after described first control signal keeps the first preset time T 1 with identical duty ratio, described control module reduces the duty ratio of described first control signal, and export the second control signal when described average current is less than or equal to the second current threshold to control the service time of described power switch, and after described second control signal keeps the second preset time T 2 with identical duty ratio, described control module improves the duty ratio of described second control signal, wherein, described second current threshold is less than described first current threshold.
8. electromagnetic induction heater as claimed in claim 7, is characterized in that, 0 minute≤T1≤5 minute, 0 minute≤T2≤5 minute.
9. electromagnetic induction heater as claimed in claim 7, it is characterized in that, the average heating power that described control module controls described electromagnetic induction heater is within the scope of the default positive and negative deviation of rated power.
10. electromagnetic induction heater as claimed in claim 9, it is characterized in that, described default positive and negative deviation scope is 5% ~-20%.
11. electromagnetic induction heaters as claimed in claim 9, it is characterized in that, described first current threshold is the current value corresponding when being in maximum overgauge of described rated power, and described second current threshold is the current value corresponding when being in minimal negative deviation of described rated power.
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| CN106211393B (en) * | 2015-04-30 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Heating power control method and device of electromagnetic heating system |
| 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 |
| CN108738179B (en) * | 2017-04-14 | 2021-06-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and control method thereof |
| CN108811212B (en) * | 2017-05-02 | 2021-12-24 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, heating control method and heating control device thereof |
| CN109812358A (en) * | 2017-11-21 | 2019-05-28 | 上海汽车集团股份有限公司 | A kind of heating system |
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| JP3443448B2 (en) * | 1994-03-30 | 2003-09-02 | 株式会社東芝 | Inverter device |
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