CN203457344U - Electromagnetic heating device and control circuit thereof - Google Patents
Electromagnetic heating device and control circuit thereof Download PDFInfo
- Publication number
- CN203457344U CN203457344U CN201320414318.5U CN201320414318U CN203457344U CN 203457344 U CN203457344 U CN 203457344U CN 201320414318 U CN201320414318 U CN 201320414318U CN 203457344 U CN203457344 U CN 203457344U
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- resonance
- control circuit
- switch
- selector switch
- capacitor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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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 capacitor and a second capacitor. One end of each resonance heating module is connected with one end of the selection switch. Each resonance heating module comprises a resonance capacitor and a resonance coil which are connected in parallel. One end of the first capacitor is connected with the other end of the selection switch. The other end of the first capacitor is connected with one end of the second capacitor and then grounded. The other end of the second capacitor is connected with the other end of each resonance heating module. When a first resonance loop is formed by the resonance capacitor and the resonance coil in each resonance heating module, a second resonance loop is formed by the resonance coil and the first capacitor and the second capacitor. When the electromagnetic heating device is in use, a dual-loop resonance circuit can be formed so that a C-electrode voltage of a power switch, e.g. an IGBT, is effectively reduced, then the power switch is stable and reliable in working, and thus efficiency is enhanced.
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
Along with constantly popularizing of electromagnetic oven application, its security reliability is had to more and more higher requirement.Traditional electromagnetic oven, its resonant circuit generally adopts inductance coil and the independent resonant capacitance scheme coordinating in parallel, adopt electromagnetic oven power switch IGBT(Insulated Gate Bipolar Transistor when work of this resonant circuit, insulated gate bipolar transistor) C pole tension is higher, the electric current that flows through IGBT is excessive, easily cause IGBT due to overvoltage or overheated damage, especially adopting a plurality of inductance coils and a plurality of resonant capacitance to form in the electromagnetic oven of a plurality of Electromagnetic Heatings unit, when work in a plurality of Electromagnetic Heatings unit simultaneously, the C pole tension of power switch IGBT can become higher, the as easy as rolling off a log IGBT that causes damages.
For solving the problem of above-mentioned appearance, in prior art, be mostly to adopt the method for the enhancing components and parts design parameters such as compressive resistance that improve IGBT, the too high problem of C pole tension of IGBT in the time of can not fundamentally solving resonance.
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, and this control circuit can form dual loopback resonant circuit when electromagnetic heater is worked, and effectively reduces for example C pole tension of IGBT of power switch, make power switch working stability reliable, raising efficiency.
For achieving the above object, the control circuit of a kind of electromagnetic heater the utility model proposes, comprising: selector switch; Two above resonance heating modules, one end of each resonance heating module and one end of described selector switch in described two above resonance heating modules are connected, and described each resonance heating module comprises resonant capacitance in parallel and resonance coil; The first electric capacity and the second electric capacity, one end of described the first electric capacity is connected with the other end of described selector switch, ground connection after the other end of described the first electric capacity is connected with one end of described the second electric capacity, the other end of described the second electric capacity is connected with the other end of described each resonance heating module, wherein, when the resonant capacitance in described each resonance heating module and resonance coil form the first resonant tank, described resonance coil and described the first electric capacity and the second electric capacity form the second resonant tank.
According to the control circuit the utility model proposes, by controlling selector switch, control the number of the resonance heating module that carries out heating work, and the resonant capacitance in each resonance heating module and resonance coil are while forming the first resonant tank, this resonance coil and the first electric capacity and the second electric capacity form the second resonant tank, form dual loopback resonant circuit.When using the resonant capacitance of identical parameters, equivalent capacitance value in resonant circuit is greater than the capacitance of the single resonant tank of prior art, therefore calutron in the situation that power is identical, can effectively reduce for example C pole tension of IGBT of power switch, thereby effectively protects power switch; And control circuit of the present utility model power switch voltage that for example IGBT opens when low-power is lower, can effectively reduce turn-on consumption, makes power switch working stability reliable, raising efficiency.
Wherein, described the second Capacitance parallel connection is at the two ends of the power switch of electromagnetic heater, and the control end of described power switch is connected with the controller of described electromagnetic heater.And described controller is also connected with the control end of described selector switch, described controller is controlled the closed of described selector switch and is turn-offed.Preferably, described power switch is IGBT.
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, described selector switch 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 described each resonance heating module.
Preferably, described control circuit also comprises the output of the rectification module that is connected to described electromagnetic heater and the choking-winding between described selector switch.
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.
Reference numeral:
Two above resonance heating modules 10, selector switch 20, the first capacitor C 1 and the second capacitor C 2, resonant capacitance C0 and resonance coil L0, controller 30, power switch 40, rectification module 50 and choking-winding L.
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 and the first capacitor C 1 and the second capacitor C 2.And in embodiment of the present utility model, this control circuit also comprises controller 30, power switch 40, rectification module 50, choking-winding L.
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 each resonance heating module 10 comprises resonant capacitance C0 in parallel and resonance coil L0.One end of the first capacitor C 1 is connected with the other end of selector switch 20, ground connection after the other end of the first capacitor C 1 is connected with one end of the second capacitor C 2, and the other end of the second capacitor C 2 is connected with the other end of each resonance heating module 10.And the second capacitor C 2 is connected in parallel on the two ends of the power switch 40 of electromagnetic heater, the control end of power switch 40 is connected with the controller of electromagnetic heater 30, and controller 30 is for exporting the turn-on and turn-off of control signal power ratio control switch 40.In addition, controller 30 is also connected with the control end of selector switch 20, and controller 30 is also for controlling the closed of selector switch 20 and turn-offing, thereby selects corresponding resonance heating module 10 to carry out resonance heating work.
Preferably, in an example of the present utility model, as shown in Figure 1, power switch 40 can be IGBT, and the second electric capacity is connected across the collector electrode C of IGBT and the two ends of emitter E.
As shown in Figure 1, choking-winding L is connected between the output and selector switch 20 of rectification module 50 of electromagnetic heater, one end of choking-winding L is connected with the output of rectification module 50, the other end of choking-winding L is connected respectively with one end of the first capacitor C 1 with one end of selector switch 20, and the input of rectification module 50 is connected with the electric main AC of input.
In embodiment of the present utility model, when the resonant capacitance C0 in each resonance heating module 10 and resonance coil L0 form the first resonant tank, resonance coil L0 and the first capacitor C 1 and the second capacitor C 2 form the second resonant tank.That is to say, when electromagnetic heater is worked, and when controller 30 carries out work by one in two above resonance heating modules of control selector switch 20 selection, resonance coil L0 and resonant capacitance C0 in this resonance heating module form the first resonant tank, and resonance coil L0 in this resonance heating module and the first capacitor C 1 and the second capacitor C 2 form the second resonant tanks.When if controller 30 control selector switches 20 select two above resonance heating modules to carry out work simultaneously, resonance coil L0 and the resonant capacitance C0 in each resonance heating module forms the first resonant tank, and the resonance coil L0 in each resonance heating module and the first capacitor C 1 and second capacitor C 2 formation the second resonant tanks.When power switch 40 turn-offs, the first capacitor C 1 and the second capacitor C 2 participate in resonance; When power switch 40 conducting, the first capacitor C 1 and the second capacitor C 2 play filter action.
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, by controlling selector switch 20, control the number of the resonance heating module 10 that carries out heating work, and the resonant capacitance C0 in each resonance heating module 10 and resonance coil L0 are while forming the first resonant tank, this resonance coil L0 and the first capacitor C 1 and the second capacitor C 2 form the second resonant tank, form dual loopback resonant circuit.When using the resonant capacitance of identical parameters, equivalent capacitance value in resonant circuit is greater than the capacitance of the single resonant tank of prior art, therefore calutron in the situation that power is identical, can effectively reduce for example C pole tension of IGBT of power switch, thereby effectively protects power switch; And control circuit of the present utility model power switch voltage that for example IGBT opens when low-power is lower, can effectively reduce turn-on consumption, makes power switch working stability reliable, raising efficiency.
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;
Two above resonance heating modules, one end of each resonance heating module and one end of described selector switch in described two above resonance heating modules are connected, and described each resonance heating module comprises resonant capacitance in parallel and resonance coil;
The first electric capacity and the second electric capacity, one end of described the first electric capacity is connected with the other end of described selector switch, ground connection after the other end of described the first electric capacity is connected with one end of described the second electric capacity, the other end of described the second electric capacity is connected with the other end of described each resonance heating module, wherein, when the resonant capacitance in described each resonance heating module and resonance coil form the first resonant tank, described resonance coil and described the first electric capacity and the second electric capacity form the second resonant tank.
2. control circuit as claimed in claim 1, is characterized in that, described the second Capacitance parallel connection is at the two ends of the power switch of electromagnetic heater, and the control end of described power switch is connected with the controller of described electromagnetic heater.
3. control circuit as claimed in claim 2, is characterized in that, described controller is also connected with the control end of described selector switch, and described controller is controlled the closed of described selector switch and turn-offed.
4. control circuit as claimed in claim 2, is characterized in that, described power switch is IGBT.
5. 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.
6. control circuit as claimed in claim 5, 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.
7. control circuit as claimed in claim 1, is characterized in that, described selector switch is 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 described each resonance heating module.
8. control circuit as claimed in claim 1, is characterized in that, also comprises the output of the rectification module that is connected to described electromagnetic heater and the choking-winding between described selector switch.
9. an electromagnetic heater, is characterized in that, comprises the control circuit as described in claim 1-8 any one.
10. electromagnetic heater as claimed in claim 9, is characterized in that, described electromagnetic heater is electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320414318.5U CN203457344U (en) | 2013-07-11 | 2013-07-11 | Electromagnetic heating device and control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320414318.5U CN203457344U (en) | 2013-07-11 | 2013-07-11 | Electromagnetic heating device and control circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN203457344U true CN203457344U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320414318.5U Expired - Fee Related CN203457344U (en) | 2013-07-11 | 2013-07-11 | Electromagnetic heating device and control circuit thereof |
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| Country | Link |
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| CN (1) | CN203457344U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039032A (en) * | 2014-05-28 | 2014-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method and control device thereof |
| CN106162963A (en) * | 2015-04-07 | 2016-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| 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 |
| CN114390738A (en) * | 2021-12-22 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Electromagnetic resonance control circuit and electromagnetic heating device |
-
2013
- 2013-07-11 CN CN201320414318.5U patent/CN203457344U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039032A (en) * | 2014-05-28 | 2014-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method and control device thereof |
| CN104039032B (en) * | 2014-05-28 | 2016-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method thereof and control device |
| CN106162963A (en) * | 2015-04-07 | 2016-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| 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 |
| CN114390738A (en) * | 2021-12-22 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Electromagnetic resonance control circuit and electromagnetic heating device |
| WO2023116552A1 (en) * | 2021-12-22 | 2023-06-29 | 广东美的白色家电技术创新中心有限公司 | Electromagnetic resonance control circuit and electromagnetic heating device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20210711 |
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| CF01 | Termination of patent right due to non-payment of annual fee |