CN104284464A - Control method for seamlessly switching multiple electromagnetic heating units - Google Patents
Control method for seamlessly switching multiple electromagnetic heating units Download PDFInfo
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Abstract
The invention discloses a control method for seamlessly switching multiple electromagnetic heating units. The control method for seamlessly switching multiple electromagnetic heating units comprises the steps that S1, when an electromagnetic heating device works, zero-crossing detection is carried out on the voltage of alternating-current mains supply input into the electromagnetic heating device so that a first detection signal can be obtained; S2, whether the voltage of the alternating-current mains supply crosses zero or not is judged according to the first detection signal; S3, when the voltage of the alternating-current mains supply crosses zero, interrupt processing is carried out; S4, whether the current time meets preset conditions or not is judged, and if the current time meets the preset conditions, a selector switch of the electromagnetic heating device is controlled to carry out switching on a currently heating resonance coil. According to the control method, when the voltage of the mains supply crosses zero, the resonance coil is controlled to be switched, no safety time interval is needed, continuous heating is achieved, a heating effect is good, a pot does not need to be detected again, and noise is low.
Description
Technical field
The present invention relates to electromagnetic heating technique field, particularly a kind of control method of electromagnetic heater.
Background technology
Existing electromagnetic oven is in cooking food process, and carry out mainly with completely circle mode of heating, pan heating location remains unchanged, and easily causes heating liquid to roll dead angle, and cause being heated uneven, the nutrition of food is difficult to release.
Normally on hardware, solve the problems referred to above by the control mode of two rings alternately heating to form convection effects, but Microprocessor S3C44B0X electronic switch selects different coil to participate in there is certain safe time interval in the selection handoff procedure of resonance heating, heating is caused to be interrupted, affect heating effect, and in this process when power rises, need again to detect pan, noise is larger.
Summary of the invention
Object of the present invention is intended to solve above-mentioned technological deficiency at least to a certain extent.
For this reason, the present invention needs the control method proposing a kind of electromagnetic heater, this control method controls resonance coil when line voltage and the equal zero passage of resonance potential and switches, without the need to safe time interval, realize the continuity of heating, heating effect is good, and without the need to again detecting pan, noise is little.
For achieving the above object, the control method of a kind of electromagnetic heater that the embodiment of the present invention proposes, comprise the steps: S1, when described electromagnetic heater work, zero passage detection is carried out to obtain the first detection signal to the voltage of the electric main inputing to described electromagnetic heater; S2, judges the voltage whether zero passage of described electric main according to described first detection signal; S3, enters interrupt processing when the voltage zero-cross of described electric main; S4, judges whether current time meets pre-conditioned, if meet described pre-conditioned, then the resonance coil of selector switch to current heating controlling described electromagnetic heater switches.
According to the control method that the embodiment of the present invention proposes, judge when the voltage zero-cross of electric main being detected, and when judging to satisfy condition, control resonance coil switches, and makes switching coil carry out at line voltage zero crossing, without the need to switch-off power switch in handoff procedure, without the need to safe time interval, and in handoff procedure, power continues to export, and realize the continuity of heating, heating effect is good, simultaneously without the need to again detecting pan, noise is less.
In one embodiment of the invention, described step S4 following steps replace: the number of times calculating interrupt processing according to described current time, and when the number of times of described interrupt processing is more than or equal to preset times, the resonance coil of selector switch to current heating controlling described electromagnetic heater switches.
Wherein, judge whether zero passage specifically comprises for the voltage of described electric main according to described first detection signal: judge whether the voltage of described electric main is less than or equal to the first predeterminated voltage, if the voltage of described electric main is less than or equal to described first predeterminated voltage, then judge the voltage zero-cross of described electric main.Described first predeterminated voltage can be more than or equal to 1V and be less than or equal to 100V.
In described step S4, when described current time is more than or equal to Preset Time, be judged as that described current time meets described pre-conditioned; When described current time is less than described Preset Time, original resonance coil is kept to participate in resonance to heat.Wherein, described Preset Time can be more than or equal to 1S and be less than or equal to 60S.
Further, in one embodiment of the invention, when the number of times of described interrupt processing is less than described preset times, original resonance coil is kept to participate in resonance to heat.
Preferably, in one embodiment of the invention, after described step S3, described control method also comprises: carry out zero passage detection to obtain the second detection signal to the resonance potential of described resonance coil; Judge described resonance potential whether zero passage according to described second detection signal, and perform described step S4 when described resonance potential zero passage.Wherein, described resonance potential is the C pole tension of IGBT in described electromagnetic heater.
Also zero passage detection is carried out to resonance potential when the voltage zero-cross of input AC civil power, make power switch more safe and reliable in resonance coil handoff procedure.
Particularly, judge whether zero passage specifically comprises described resonance potential according to described second detection signal: judge whether described resonance potential is less than or equal to the second predeterminated voltage, if described resonance potential is less than or equal to described second predeterminated voltage, then judge described resonance potential zero passage.Wherein, described second predeterminated voltage can be more than or equal to 1V and be less than or equal to 100V.
Preferably, in one embodiment of the invention, in step s 4 which, when described current time meet described pre-conditioned time, time delay second Preset Time controls the resonance coil of selector switch to current heating and switches.
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 control circuit schematic diagram of electromagnetic heater according to an embodiment of the invention;
Fig. 2 is the control circuit schematic diagram of electromagnetic heater in accordance with another embodiment of the present invention
Fig. 3 is the flow chart of the control method of electromagnetic heater according to the embodiment of the present invention;
Fig. 4 is the flow chart of the control method of electromagnetic heater according to the present invention's concrete example; And
Fig. 5 is the flow chart according to the present invention one preferably control method of the electromagnetic heater of concrete example.
Reference numeral:
Two or more resonance heating module 10, selector switch 20, controller 30, first zero passage detection module 40 and the second zero passage detection module 50, power switch 60, rectification module 70, filtration module 80, input AC civil power AC, resonant capacitance C0 and resonance coil L0, choking-winding L ' and filter capacitor C ', the first resistance R1, the first electric capacity C1, the first triode Q1, the second electric capacity C2, the second triode Q2, the second resistance R2 and the 3rd electric capacity C3.
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.
The control circuit of electromagnetic heater once was first described with reference to accompanying drawing below before the control method describing the electromagnetic heater proposed according to the embodiment of the present invention.
Fig. 1 is the control circuit schematic diagram of electromagnetic heater according to an embodiment of the invention.As shown in Figure 1, the control circuit of this electromagnetic heater comprises two or more resonance heating module 10, selector switch 20, controller 30, first zero passage detection module 40 and the second zero passage detection module 50.Further, in an embodiment of the present invention, this control circuit also comprises power switch 60, rectification module 70, filtration module 80.
Wherein, one end of each resonance heating module 10 in two or more resonance heating module is connected with one end of selector switch 20, and each resonance heating module 10 comprises resonant capacitance C0 in parallel and resonance coil L0.As shown in Figure 1, between the output that filtration module 80 is connected to the rectification module 70 of electromagnetic heater and selector switch 20, and the input of rectification module 70 is connected with input AC civil power AC, filtration module 80 comprises choking-winding L ' and filter capacitor C ', have node between choking-winding L ' and filter capacitor C ', node is connected with the other end of selector switch 20.
In one embodiment of the invention, as shown in Figure 1, one end of the first zero passage detection module 40 is connected between the output of rectification module 70 and the input of filtration module 80, and the other end of the first zero passage detection module 40 is connected with controller 30.That is, one end of first zero passage detection module 40 is connected with the first output of rectification module 70 respectively with one end of choking-winding L ', the other end of choking-winding L ' is connected with one end of filter capacitor C ', the other end of filter capacitor C ' and the second output of rectification module 70 ground connection respectively.
In another embodiment of the present invention, as shown in Figure 2, one end of the first zero passage detection module 40 can also be connected to the input of input AC civil power AC, and the other end of the first zero passage detection module 40 is connected with controller 30.
As shown in Figure 1 or 2, second zero passage detection module 50 is connected with the other end of each resonance heating module 10, for carrying out zero-crossing examination to the resonance potential of each resonance heating module 10 to detect the zero cross signal of the resonance potential of each resonance heating module 10.Wherein, second zero passage detection module 40 is also connected with one end of the power switch 60 of electromagnetic heater, the control end of power switch 60 is connected with controller 30, the other end ground connection of power switch 60, and controller 30 controls the turn-on and turn-off of power switch 60 for exporting control signal.In an example of the present invention, power switch 60 can be IGBT, namely says, the collector electrode C of IGBT is connected with the second zero passage detection module 50, and the gate pole G of IGBT is connected with controller 30, the emitter E ground connection of IGBT.
Particularly, as shown in Figure 1 or 2, the second zero passage detection module 50 comprises the first resistance R1, the first electric capacity C1, the first triode Q1, the second electric capacity C2, the second triode Q2, the second resistance R2 and the 3rd electric capacity C3.
Wherein, one end of the first resistance R1 is connected with the collector electrode C of IGBT, and one end of the first electric capacity C1 is connected with the other end of the first resistance R1, the other end ground connection of the first electric capacity C1.The base stage of the first triode Q1 is connected with one end of the first electric capacity C1, the grounded emitter of the first triode Q1, and the collector electrode of the first triode Q1 is connected with the power supply of predetermined level such as 5V by resistance R3, and resistance R4 is connected in parallel on the two ends of the first electric capacity C1.One end of second electric capacity C2 is connected with the collector electrode of the first triode Q1, the other end ground connection of the second electric capacity C2, the base stage of the second triode Q2 is connected with the collector electrode of the first triode Q1, the grounded emitter of the second triode Q2, the collector electrode of the second triode Q2 is connected with the power supply of predetermined level by resistance R5; One end of second resistance R2 is connected with the collector electrode of the second triode Q2, and the other end of the second resistance R2 is connected with controller 30, and one end of the 3rd electric capacity C3 is connected with the other end of the second resistance R2, the other end ground connection of the 3rd electric capacity C3.
Certainly, be understandable that, in the embodiment of the present invention, the circuit of the second zero passage detection module 50 is not limited in the above, can be any circuit that can realize carrying out resonance potential zero passage detection.
In an embodiment of the present invention, as shown in Figure 1 or 2, control end, the first zero passage detection module 40 of controller 30 and selector switch 20 are connected respectively with the second zero passage detection module 50, and controller 30 is according to the zero cross signal of input AC civil power AC and control selector switch 20 when resonance potential zero passage and switch.In a concrete example of the present invention, controller 30 can be Micro-processor MCV.
Specifically, MCU carries out the switching of resonance coil in resonance heating module 10 under controlling the low-voltage (comprising no-voltage) that selector switch 20 realizes when ac commercial power voltage and the equal zero passage of resonance potential, make in handoff procedure without the need to turning off IGBT, without the need to safe time interval, in handoff procedure, power continues to export, and realize the continuity of heating, heating effect is good, simultaneously without the need to again detecting pan, noise is less.
In some embodiments of the invention, selector switch 20 can throw formula switch or multiple single-pole single-throw(SPST formula switch for hilted broadsword more, and when selector switch 20 is multiple single-pole single-throw(SPST formula switch, each single-pole single-throw(SPST formula switch in multiple single-pole single-throw(SPST formula switch and each resonance heating module 10 one_to_one corresponding.
In other embodiments of the present invention, selector switch 20 can also be multiple relay, controllable silicon, IGBT or metal-oxide-semiconductor, and each relay, controllable silicon, IGBT or metal-oxide-semiconductor and each resonance heating module 10 one_to_one corresponding.
Fig. 3 is the flow chart of the control method of electromagnetic heater according to the embodiment of the present invention.As shown in Figure 3, the control method of this electromagnetic heater comprises the steps:
S1, when electromagnetic heater works, zero passage detection is carried out to obtain the first detection signal to the voltage of the electric main inputing to electromagnetic heater, that is, first zero passage detection module carries out zero-crossing examination to detect the zero cross signal of electric main AC to the voltage of electric main AC, and the first detection signal is inputed to controller.
S2, judges the voltage whether zero passage of electric main according to the first detection signal.Controller judges whether zero passage according to the size of the voltage of the electric main of current detection, namely say, judge whether the voltage of electric main AC is less than or equal to the first predeterminated voltage U0, if the voltage of electric main is less than or equal to the first predeterminated voltage U0, then judge the voltage zero-cross of electric main.That is, when the voltage U of input AC civil power is less than or equal to the first predeterminated voltage U0, controller judges the voltage zero-cross of input AC civil power according to detection signal now.Wherein, the first predeterminated voltage U0 can for being more than or equal to 1V and being less than or equal to 100V.
S3, enters interrupt processing when the voltage zero-cross of electric main.
S4, judges whether current time meets pre-conditioned, if meet pre-conditioned, then the resonance coil of selector switch to current heating controlling electromagnetic heater switches.
In one embodiment of the invention, in step s 4 which, when described current time is more than or equal to Preset Time, be then judged as that current time meets pre-conditioned.And when described current time is less than Preset Time, keep original resonance coil to participate in resonance to heat.
Specifically, in the process of the voltage zero-cross of input AC civil power, the main program of electromagnetic heater enters interrupt processing, and controller detects the current time t of timer, and as t≤Ton, controller output signal drives selector switch to switch resonance coil; Work as t<Ton, keep original resonance coil to participate in resonance to carry out resonance heating.Wherein, be preset with the operating time and preset time T on of often organizing coil single in controller, timer reclocking when every secondary coil switches, preset time T on can be more than or equal to 1S and be less than or equal to 60S.
In another embodiment of the present invention, step S4 can also replace by following steps: the number of times calculating interrupt processing according to current time, and when the number of times of interrupt processing is more than or equal to preset times, the resonance coil of selector switch to current heating controlling electromagnetic heater switches.
In step s 4 which, calculate the number of times of interrupt processing according to current time, and when the number of times of interrupt processing is more than or equal to preset times, controls resonance coil and switch.When the number of times of interrupt processing is less than preset times, original resonance coil is kept to participate in resonance to heat.
That is, compared by the preset times N calculated in interrupt processing times n and microprocessor, as n≤N, microprocessor output signal drives selector switch to switch resonance coil; Work as n<N, keep original resonance coil to participate in resonance to carry out resonance heating.
Preferably, in one embodiment of the invention, after step s 3, the control method of above-mentioned electromagnetic heater also comprises: carry out zero passage detection to obtain the second detection signal to the resonance potential of resonance coil; Judge resonance potential whether zero passage according to the second detection signal, and perform step S4 when resonance potential zero passage.In resonance coil handoff procedure, in order to make power switch IGBT safety and reliability in resonance coil handoff procedure, also need to detect the zero cross signal of resonance potential.After above-mentioned steps S3, also comprise: the second zero passage detection module carries out zero passage detection to resonance potential, and the second detection signal is exported to microprocessor, as resonance potential U1≤U2, U2 is the second predeterminated voltage, microprocessor is judged as resonance potential zero passage according to detection signal now, just enters above-mentioned steps S4.
Wherein, judge whether zero passage specifically comprises resonance potential according to the second detection signal: judge whether resonance potential U1 is less than or equal to the second predeterminated voltage U2, if resonance potential U1 is less than or equal to the second predeterminated voltage U2, then judge resonance potential zero passage.Second predeterminated voltage U2 can be more than or equal to 1V and be less than or equal to 100V.Wherein, resonance potential is the C pole tension of IGBT in electromagnetic heater.
Preferably, in one embodiment of the invention, in step s 4 which, when current time meets pre-conditioned, time delay second Preset Time controls the resonance coil of selector switch to current heating and switches.Wherein, the second Preset Time can be demarcated according to actual conditions.
Because selector switch is when receiving control signal, itself there is certain time delay reaction time, under selector switch actual open or turn off and be in low-voltage, selector switch is made to be in particular phases (under low-voltage or zero passage voltage) by time delay second Preset Time open-minded.
In a concrete example of the present invention, as shown in Figure 4, the control method of above-mentioned electromagnetic heater comprises the steps:
S401, start, electromagnetic heater is started working.
S402, keeps original resonance coil to heat.
S403, judges whether U is less than or equal to U0, namely judges line voltage whether zero passage.If so, then step S404 is performed; If not, then return step S403, continue to judge.
S404, in the process of civil power zero passage, enters interrupt processing.
S405, judges whether current time t is more than or equal to preset time T on.If so, then step S406 is performed; If not, then execution step S402 is returned.
In step S405, can also carry out judging whether to need to switch resonance coil according to the number of times of interrupt processing.
S406, switches resonance coil and heats.
Preferably, in a concrete example of the present invention, as shown in Figure 5, the control method of above-mentioned electromagnetic heater comprises the steps:
S501, start, electromagnetic heater is started working.
S502, keeps original resonance coil to heat.
S503, judges whether U is less than or equal to U0, namely judges line voltage whether zero passage.If so, then step S504 is performed; If not, then return step S503, continue to judge.
S504, judges whether U1 is less than or equal to U2, namely judges resonance potential whether zero passage.If so, then step S505 is performed; If not, then return step S504, continue to judge.
S505, in the process of civil power and the equal zero passage of resonance potential, enters interrupt processing.
S506, judges whether current time t is more than or equal to preset time T on.If so, then step S507 is performed; If not, then execution step S502 is returned.
In step S506, can also carry out judging whether to need to switch resonance coil according to the number of times of interrupt processing.
S507, switches resonance coil and heats.
According to the control method that the embodiment of the present invention proposes, judge when the equal zero passage of voltage and resonance potential that electric main detected, and control resonance coil switches when judging to satisfy condition, make without the need to switch-off power switch in handoff procedure, without the need to safe time interval, and in handoff procedure, power continues to export, realize the continuity of heating, heating effect is good, and simultaneously without the need to again detecting pan, noise is less.
Wherein, it should be noted that, electromagnetic heater can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker 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 (12)
1. a control method for electromagnetic heater, is characterized in that, comprises the steps:
S1, when described electromagnetic heater work, carries out zero passage detection to obtain the first detection signal to the voltage of the electric main inputing to described electromagnetic heater;
S2, judges the voltage whether zero passage of described electric main according to described first detection signal;
S3, enters interrupt processing when the voltage zero-cross of described electric main;
S4, judges whether current time meets pre-conditioned, if meet described pre-conditioned, then the resonance coil of selector switch to current heating controlling described electromagnetic heater switches.
2. control method as claimed in claim 1, it is characterized in that, described step S4 following steps replace: the number of times calculating interrupt processing according to described current time, and when the number of times of described interrupt processing is more than or equal to preset times, the resonance coil of selector switch to current heating controlling described electromagnetic heater switches.
3. control method as claimed in claim 1 or 2, is characterized in that, judges whether zero passage specifically comprises for the voltage of described electric main according to described first detection signal:
Judge whether the voltage of described electric main is less than or equal to the first predeterminated voltage, if the voltage of described electric main is less than or equal to described first predeterminated voltage, then judge the voltage zero-cross of described electric main.
4. control method as claimed in claim 1 or 2, is characterized in that, in described step S4, when described current time is more than or equal to Preset Time, be then judged as that described current time meets described pre-conditioned; When described current time is less than described Preset Time, original resonance coil is kept to participate in resonance to heat.
5. control method as claimed in claim 2, is characterized in that, when the number of times of described interrupt processing is less than described preset times, keeps original resonance coil to participate in resonance to heat.
6. control method as claimed in claim 1 or 2, is characterized in that, after described step S3, also comprise:
Zero passage detection is carried out to obtain the second detection signal to the resonance potential of described resonance coil;
Judge described resonance potential whether zero passage according to described second detection signal, and perform described step S4 when described resonance potential zero passage.
7. control method as claimed in claim 6, it is characterized in that, described resonance potential is the C pole tension of IGBT in described electromagnetic heater.
8. control method as claimed in claim 6, is characterized in that, judge whether zero passage specifically comprises described resonance potential according to described second detection signal:
Judge whether described resonance potential is less than or equal to the second predeterminated voltage, if described resonance potential is less than or equal to described second predeterminated voltage, then judge described resonance potential zero passage.
9. control method as claimed in claim 8, it is characterized in that, described second predeterminated voltage is more than or equal to 1V and is less than or equal to 100V.
10. control method as claimed in claim 3, it is characterized in that, described first predeterminated voltage is more than or equal to 1V and is less than or equal to 100V.
11. control methods as claimed in claim 4, it is characterized in that, described Preset Time is more than or equal to 1S and is less than or equal to 60S.
12. control methods as claimed in claim 1, is characterized in that, in step s 4 which, when described current time meet described pre-conditioned time, time delay second Preset Time controls the resonance coil of selector switch to current heating and switches.
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| CN201310292359.6A CN104284464B (en) | 2013-07-11 | 2013-07-11 | The control method of many Electromagnetic Heatings unit seamless switching |
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| CN106211391A (en) * | 2015-04-29 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control apparatus and method |
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| CN109152117A (en) * | 2017-06-28 | 2019-01-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus, electromagnetic heating system and its pulse width modulation method |
| CN112449451A (en) * | 2019-08-29 | 2021-03-05 | 台达电子工业股份有限公司 | Induction cooker and operation method thereof |
| CN112449451B (en) * | 2019-08-29 | 2023-03-21 | 台达电子工业股份有限公司 | Induction cooker and operation method thereof |
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