CN203457342U - Electromagnetic heating device and control circuit thereof - Google Patents
Electromagnetic heating device and control circuit thereof Download PDFInfo
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- CN203457342U CN203457342U CN201320414316.6U CN201320414316U CN203457342U CN 203457342 U CN203457342 U CN 203457342U CN 201320414316 U CN201320414316 U CN 201320414316U CN 203457342 U CN203457342 U CN 203457342U
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Abstract
The utility model discloses an electromagnetic heating device and a control circuit thereof. The control circuit comprises a selection switch, more than two resonance heating modules, a first zero-crossing detection module, a second zero-crossing detection module and a controller. One end of each resonance heating module is connected with the selection switch. The first zero-crossing detection module is used for detecting a zero-crossing signal inputted to an AC commercial power supply. The second zero-crossing detection module is used for detecting a resonance voltage of each resonance heating module. The second zero-crossing detection module is connected with the other end of each resonance heating module. The controller is respectively connected with the selection switch, the first zero-crossing detection module and the second zero-crossing detection module. The controller controls the selection switch to switch according to the zero-crossing signal inputted to the AC commercial power supply when the resonance voltage crosses zero. When the commercial power supply voltage and the resonance voltage both cross zero, the control circuit controls the selection switch to perform coil switching without safety time intervals so that continuity of heating is realized, and heating effect is great. Besides, pans do not need to be detected again, and noise is low.
Description
Technical field
The utility model relates to electromagnetic heating technique field, particularly a kind of control circuit of electromagnetic heater and a kind of electromagnetic heater with this control circuit.
Background technology
Existing electromagnetic oven, in cooking food process, carries out mainly with enclosing mode of heating completely, and pan heating location remains unchanged, and easily causes heating liquid rolling dead angle, causes being heated inhomogeneous, and the nutrition of food is difficult to discharge.
Normally on hardware by two rings alternately the control mode of heating to form convection effects, solve the problems referred to above, but microprocessor is controlled electronic switch and is selected to have certain safety time interval in the selection handoff procedure of different coils participation resonance heating, cause heating to be interrupted, affect heating effect, and in this process when power rises, need to again detect pan, noise is larger.
Utility model content
The purpose of this utility model is intended to solve at least to a certain extent above-mentioned technological deficiency.
For this reason, the utility model need to propose a kind of control circuit of electromagnetic heater, this control circuit is controlled selector switch and is carried out coil switching when line voltage and the equal zero passage of resonance potential, without safety time interval, realize the continuity of heating, heating effect is good, and without again pan being detected, noise is little.
For achieving the above object, the control circuit of a kind of electromagnetic heater the utility model proposes, comprising: selector switch; Power switch; Two above resonance heating modules, each the resonance heating module in described two above resonance heating modules comprises resonance coil and resonant capacitance, and one end of described each resonance heating module is connected with described selector switch, and the other end is connected with described power switch; The first zero passage detection module of zero cross signal for detection of the electric main of input; For detection of the second zero passage detection module of the resonance potential of described resonance heating module, the input of described the second zero passage detection module is connected with the other end of described each resonance heating module; Controller, described controller is connected respectively with described the first zero passage detection module with the output of described selector switch, described the second zero passage detection module, and described controller is controlled described selector switch according to the zero cross signal of described electric main and when the described resonance potential zero passage and switched.
According to the control circuit the utility model proposes, in the first zero passage detection module, the voltage of electric main and resonance potential that the second zero passage detection module detects detected all in zero passage during the period, controlling selector switch switches the resonance coil in resonance heating module, make in the handoff procedure of selective resonance coil heats without switch-off power switch, without safety time interval, and in handoff procedure, power continues output, realize the continuity of heating, heating effect is good, without again pan being detected, noise is less simultaneously.
Wherein, the other end of described each resonance heating module and the line of described power switch are provided with node, and the input of described the second zero passage detection module is connected with described node, and the control end of described power switch is connected with described controller.Preferably, described power switch is IGBT.And, the collector voltage that described resonance potential is IGBT.
Particularly, described the second zero passage detection module comprises: the first resistance, and one end of described the first resistance is connected with the collector electrode of described IGBT; The first electric capacity, one end of described the first electric capacity is connected with the other end of described the first resistance, the other end ground connection of described the first electric capacity; The first triode, the base stage of described the first triode is connected with one end of described the first electric capacity, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the power supply of predetermined level; The second electric capacity, one end of described the second electric capacity is connected with the collector electrode of described the first triode, the other end ground connection of described the second electric capacity; The second triode, the base stage of described the second triode is connected with the collector electrode of described the first triode, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with the power supply of described predetermined level; The second resistance, one end of described the second resistance is connected with the collector electrode of described the second triode, and the other end of described the second resistance is connected with described controller; The 3rd electric capacity, one end of described the 3rd electric capacity is connected with the other end of described the second resistance, the other end ground connection of described the 3rd electric capacity.
And, described control circuit also comprises the output of the rectification module that is connected to described electromagnetic heater and the filtration module between described selector switch, the input of described rectification module is connected with described electric main, one end of described the first zero passage detection module is connected between the output of described rectification module and the input of described filtration module, and the other end of described the first zero passage detection module is connected with described controller.
Preferably, one end of described the first zero passage detection module is connected to the input of described electric main, and the other end of described the first zero passage detection module is connected with described controller.
Preferably, described selector switch can be thrown formula switch or a plurality of single-pole single-throw(SPST formula switch for hilted broadsword more.When described selector switch is a plurality of single-pole single-throw(SPST formula switch, each the single-pole single-throw(SPST formula switch in described a plurality of single-pole single-throw(SPST formula switches is corresponding one by one with described each resonance heating module.
In addition, the utility model has also proposed a kind of electromagnetic heater, and it comprises control circuit described above.Wherein, described electromagnetic heater can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
The aspect that the utility model is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the control circuit schematic diagram according to the electromagnetic heater of the utility model embodiment; And
Fig. 2 is the control circuit schematic diagram according to the electromagnetic heater of another embodiment of the utility model.
Reference numeral:
Two above resonance heating modules 10, selector switch 20, controller 30, the first zero passage detection module 40 and the second zero passage detection modules 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 R 1, the first capacitor C 1, the first triode Q1, the second capacitor C 2, the second triode Q2, the second resistance R 2 and the 3rd capacitor C 3.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model 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 utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are for the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.
In description of the present utility model, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
With reference to description and accompanying drawing below, by these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, specifically disclose some specific implementations in embodiment of the present utility model, represent to implement some modes of the principle of embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprises spirit and all changes within the scope of intension, modification and the equivalent that falls into additional claims.
The control circuit of the electromagnetic heater proposing according to the utility model embodiment and the electromagnetic heater with this control circuit are described with reference to the accompanying drawings.
Fig. 1 is the control circuit schematic diagram according to the electromagnetic heater of the utility model embodiment.As shown in Figure 1, the control circuit of this electromagnetic heater comprises two above resonance heating modules 10, selector switch 20, controller 30, the first zero passage detection module 40 and the second zero passage detection modules 50.And in embodiment of the present utility model, this control circuit also comprises power switch 60, rectification module 70, filtration module 80.
Wherein, one end of each the resonance heating module 10 in two above resonance heating modules is connected with one end of selector switch 20, and the other end is connected with power switch 60, and each resonance heating module 10 comprises resonant capacitance C0 in parallel and resonance coil L0.As shown in Figure 1, filtration module 80 is connected between the output and selector switch 20 of rectification module 70 of electromagnetic heater, and the input of rectification module 70 is connected with the electric main AC of input, filtration module 80 comprises choking-winding L ' and filter capacitor C ', between choking-winding L ' and filter capacitor C ', have node, node is connected with the other end of selector switch 20.
In an embodiment of the present utility model, 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 to say, one end of the first zero passage detection module 40 is connected respectively with one end of choking-winding L ' and the first output of rectification module 70, the other end of choking-winding L ' is connected with one end of filter capacitor C ', and the second output of the other end of filter capacitor C ' and rectification module 70 is ground connection respectively.The first zero passage detection module 40 is for carrying out zero crossing detection to detect the zero cross signal of input AC civil power AC to the voltage of the electric main AC of input.
In another embodiment of the present utility model, as shown in Figure 2, one end of the first zero passage detection module 40 can also be connected to the input of the electric main AC of input, and the other end of the first zero passage detection module 40 is connected with controller 30.
As shown in Figure 1 or 2, the input of the second zero passage detection module 50 is connected with the other end of each resonance heating module 10, for the resonance potential of resonance heating module 10 being carried out to zero crossing detection to detect the zero cross signal of the resonance potential of each resonance heating module 10.Wherein, the line of the other end of each resonance heating module 10 and power switch 60 is provided with node, the input of the second zero passage detection module 40 is connected with described node, the control end of power switch 60 is connected with controller 30, the other end ground connection of power switch 60, controller 30 is for exporting the turn-on and turn-off of control signal power ratio control switch 60.In an example of the present utility model, power switch 60 can be IGBT, 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.And, the voltage of the collector electrode C utmost point that resonance potential is IGBT.
Particularly, as shown in Figure 1 or 2, the second zero passage detection module 50 comprises the first resistance R 1, the first capacitor C 1, the first triode Q1, the second capacitor C 2, the second triode Q2, the second resistance R 2 and the 3rd capacitor C 3.
Wherein, one end of the first resistance R 1 is connected with the collector electrode C of IGBT, and one end of the first capacitor C 1 is connected with the other end of the first resistance R 1, the other end ground connection of the first capacitor C 1.The base stage of the first triode Q1 is connected with one end of the first capacitor C 1, the grounded emitter of the first triode Q1, the collector electrode of the first triode Q1 by resistance R 3 and predetermined level for example the power supply of 5V be connected, resistance R 4 is connected in parallel on the two ends of the first capacitor C 1.One end of the second capacitor C 2 is connected with the collector electrode of the first triode Q1, the other end ground connection of the second capacitor C 2, 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 R 5; One end of the second resistance R 2 is connected with the collector electrode of the second triode Q2, and the other end of the second resistance R 2 is connected with controller 30, and one end of the 3rd capacitor C 3 is connected with the other end of the second resistance R 2, the other end ground connection of the 3rd capacitor C 3.
Certainly, be understandable that, in the utility model embodiment, the circuit of the second zero passage detection module 50 is not limited in the above, can be anyly can realize the circuit that resonance potential is carried out to zero passage detection.
In embodiment of the present utility model, as shown in Figure 1 or 2, controller 30 is connected respectively with the input of the second zero passage detection module 50 with control end, the first zero passage detection module 40 of selector switch 20, and controller 30 is according to the zero cross signal of the electric main AC of input and control selector switch 20 when the resonance potential zero passage and switch.In a concrete example of the present utility model, controller 30 can be Micro-processor MCV.
Particularly, the switching of resonance coil in carrying out resonance heating module 10 under the low-voltage (comprising no-voltage) that MCU control selector switch 20 is realized when ac commercial power voltage and the equal zero passage of resonance potential, make in handoff procedure without turn-offing IGBT, without safety time interval, in handoff procedure, power continues output, realizes the continuity of heating, and heating effect is good, without again pan being detected, noise is less simultaneously.
In embodiment more of the present utility model, selector switch 20 can be thrown formula switch or a plurality of single-pole single-throw(SPST formula switch for hilted broadsword more, and when selector switch 20 is a plurality of single-pole single-throw(SPST formula switch, each the single-pole single-throw(SPST formula switch in a plurality of single-pole single-throw(SPST formula switches is corresponding one by one with each resonance heating module 10.
In other embodiment of the present utility model, selector switch 20 can also be a plurality of relays, controllable silicon, IGBT or metal-oxide-semiconductor, and each relay, controllable silicon, IGBT or metal-oxide-semiconductor are corresponding one by one with each resonance heating module 10.
According to the control circuit the utility model proposes, in the first zero passage detection module, the voltage of electric main and resonance potential that the second zero passage detection module detects being detected all controls selector switch the resonance coil in resonance heating module is switched during the period in zero passage, make in the handoff procedure of selective resonance coil heats without switch-off power switch, without safety time interval, and in handoff procedure, power continues output, realize the continuity of heating, heating effect is good, without again pan being detected, noise is less simultaneously.
In addition, the utility model has also proposed a kind of electromagnetic heater, and it comprises control circuit described above.Wherein, electromagnetic heater can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker etc.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that in the situation that not departing from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is by claims and be equal to and limit.
Claims (10)
1. a control circuit for electromagnetic heater, is characterized in that, comprising:
Selector switch;
Power switch;
Two above resonance heating modules, each the resonance heating module in described two above resonance heating modules comprises resonance coil and resonant capacitance, and one end of described each resonance heating module is connected with described selector switch, and the other end is connected with described power switch;
The first zero passage detection module of zero cross signal for detection of the electric main of input;
For detection of the second zero passage detection module of the resonance potential of described resonance heating module, the input of described the second zero passage detection module is connected with the other end of described each resonance heating module;
Controller, described controller is connected respectively with described the first zero passage detection module with the output of described selector switch, described the second zero passage detection module, and described controller is controlled described selector switch according to the zero cross signal of described electric main and when the described resonance potential zero passage and switched.
2. control circuit as claimed in claim 1, it is characterized in that, the other end of described each resonance heating module and the line of described power switch are provided with node, and the input of described the second zero passage detection module is connected with described node, and the control end of described power switch is connected with described controller.
3. control circuit as claimed in claim 2, is characterized in that, described power switch is IGBT.
4. control circuit as claimed in claim 3, is characterized in that, the collector voltage that described resonance potential is IGBT.
5. control circuit as claimed in claim 3, is characterized in that, described the second zero passage detection module specifically comprises:
The first resistance, one end of described the first resistance is connected with the collector electrode of described IGBT;
The first electric capacity, one end of described the first electric capacity is connected with the other end of described the first resistance, the other end ground connection of described the first electric capacity;
The first triode, the base stage of described the first triode is connected with one end of described the first electric capacity, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the power supply of predetermined level;
The second electric capacity, one end of described the second electric capacity is connected with the collector electrode of described the first triode, the other end ground connection of described the second electric capacity;
The second triode, the base stage of described the second triode is connected with the collector electrode of described the first triode, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with the power supply of described predetermined level;
The second resistance, one end of described the second resistance is connected with the collector electrode of described the second triode, and the other end of described the second resistance is connected with described controller;
The 3rd electric capacity, one end of described the 3rd electric capacity is connected with the other end of described the second resistance, the other end ground connection of described the 3rd electric capacity.
6. control circuit as claimed in claim 1, is characterized in that, one end of described the first zero passage detection module is connected to the input of described electric main, and the other end of described the first zero passage detection module is connected with described controller.
7. control circuit as claimed in claim 1, it is characterized in that, also comprise the output of the rectification module that is connected to described electromagnetic heater and the filtration module between described selector switch, the input of described rectification module is connected with described electric main, one end of described the first zero passage detection module is connected between the output of described rectification module and the input of described filtration module, and the other end of described the first zero passage detection module is connected with described controller.
8. control circuit as claimed in claim 1, is characterized in that, described selector switch is that hilted broadsword is thrown formula switch or a plurality of single-pole single-throw(SPST formula switch more.
9. control circuit as claimed in claim 8, is characterized in that, when described selector switch is a plurality of single-pole single-throw(SPST formula switch, each the single-pole single-throw(SPST formula switch in described a plurality of single-pole single-throw(SPST formula switches is corresponding one by one with described each resonance heating module.
10. an electromagnetic heater, is characterized in that, comprises the control circuit as described in claim 1-9 any one.
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| CN201320414316.6U CN203457342U (en) | 2013-07-11 | 2013-07-11 | Electromagnetic heating device and control circuit thereof |
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| CN201320414316.6U CN203457342U (en) | 2013-07-11 | 2013-07-11 | Electromagnetic heating device and control circuit thereof |
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| CN105530719A (en) * | 2014-09-30 | 2016-04-27 | 深圳市鑫汇科股份有限公司 | Half-bridge multi-burner switching electromagnetic induction heating control device and method |
| CN105992417A (en) * | 2015-02-04 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Heating control circuit for electric cooking device, and electric cooking device |
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| CN107013955B (en) * | 2016-01-27 | 2019-10-29 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking pot and its control method |
| CN107155229A (en) * | 2016-03-03 | 2017-09-12 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooker and its heating control circuit and control method |
| CN107155229B (en) * | 2016-03-03 | 2023-04-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking device and heating control circuit and control method thereof |
| CN108882421A (en) * | 2017-05-11 | 2018-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Method for heating and controlling, heating control apparatus and electromagnetic heating apparatus |
| CN110049590A (en) * | 2018-12-27 | 2019-07-23 | 浙江绍兴苏泊尔生活电器有限公司 | Zero passage is from detection/processing method, electromagnetic heating circuit and electromagnetic heating utensil |
| CN113131761A (en) * | 2019-12-31 | 2021-07-16 | 广东美的生活电器制造有限公司 | Cooking appliance, drive control circuit and control method |
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