CN106162966A - Electromagnetic heater and resonance circuit - Google Patents
Electromagnetic heater and resonance circuit Download PDFInfo
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- CN106162966A CN106162966A CN201510162048.7A CN201510162048A CN106162966A CN 106162966 A CN106162966 A CN 106162966A CN 201510162048 A CN201510162048 A CN 201510162048A CN 106162966 A CN106162966 A CN 106162966A
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- resonance coil
- electromagnetic heater
- over switch
- resonance
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Abstract
The invention discloses the resonance circuit of a kind of electromagnetic heater, comprising: R-T tube, the grounded emitter of described R-T tube；Resonant capacitance, described resonant capacitance is connected in parallel between emitter stage and the colelctor electrode of described R-T tube；N number of resonance coil, described N number of resonance coil is connected with the colelctor electrode of described R-T tube after being connected in series, and wherein, N is the integer more than or equal to 2；N-1 change-over switch, described N-1 change-over switch is in parallel with N-1 resonance coil one_to_one corresponding in described N number of resonance coil；Controller by described N-1 the change-over switch of control to control the quantity of the resonance coil carrying out resonant operational, to change the resonant frequency of described electromagnetic heater.The resonance circuit of this electromagnetic heater uses series resonance mode, can change the resonant frequency of electromagnetic heater, reduces leading voltage when R-T tube is opened, and reduces the temperature rise of R-T tube.The invention also discloses a kind of electromagnetic heater.
Description
Technical field
The present invention relates to electromagnetic heating technique field, resonance circuit and one particularly to a kind of electromagnetic heater have
The electromagnetic heater of this resonance circuit.
Background technology
At present, single IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) EMR electromagnetic resonance electricity
Road typically uses parallel resonance mode, its use operate in realize high-power under the premise of resonant parameter when, if low continuously
Power section runs, then occur the problem that
(1) IGBT is open-minded in advance, opens moment IGBT transient current peak value high, is well over IGBT current peak specification
Limit, thus damage IGBT；
(2) IGBT heating is serious, need to strengthen to IGBT heat radiation (as increased fin, increasing rotation speed of fan etc.) with
Realize the temperature increase requirement of IGBT.
Content of the invention
It is contemplated that one of technical problem solving at least to a certain extent in correlation technique.
To this end, it is an object of the present invention to propose the resonance circuit of a kind of electromagnetic heater using series resonance mode,
The resonant frequency of electromagnetic heater can be changed, reduce leading voltage when R-T tube is opened, and reduce resonant switch
The temperature rise of pipe.
Further object is that a kind of electromagnetic heater of proposition.
For reaching above-mentioned purpose, the resonance circuit of a kind of electromagnetic heater that the embodiment of the present invention proposes, comprising: resonance is opened
Guan Guan, the grounded emitter of described R-T tube；Resonant capacitance, described resonant capacitance is connected in parallel on described R-T tube
Between emitter stage and colelctor electrode；N number of resonance coil, described N number of resonance coil is connected in series rear and described R-T tube
Colelctor electrode is connected, and wherein, N is the integer more than or equal to 2；N-1 change-over switch, described N-1 change-over switch and institute
State N-1 resonance coil one_to_one corresponding in N number of resonance coil in parallel；Controller, described controller is changed with each respectively
The control end of switch is connected, and described controller is by controlling described N-1 change-over switch to control the resonance carrying out resonant operational
The quantity of coil, to change the resonant frequency of described electromagnetic heater.
The resonance circuit of electromagnetic heater according to embodiments of the present invention, controller is by controlling N-1 change-over switch to control
System carries out the quantity of the resonance coil of resonant operational, and the resonance coil carrying out resonant operational is connected in series rear and resonant switch
The colelctor electrode of pipe is connected, and resonant capacitance is connected in parallel between the emitter stage of R-T tube and colelctor electrode, and therefore, the present invention implements
The resonance circuit of the electromagnetic heater of example uses series resonance mode to carry out resonant operational, and resonance coil series connection participates in resonance,
Inductance value is increased, leading voltage when R-T tube is opened and the temperature rise of reduction R-T tube can be reduced well,
R-T tube is avoided to damage so that circuit can reliably and securely work.Further, by changing participation resonant operational
The quantity of resonance coil changes resonant inductance sensibility reciprocal value, thus can change the resonant frequency of electromagnetic heater, to realize electricity
Magnetic heater continuous low power heats, and has widened the heating power scope of electromagnetic heater.
According to one embodiment of present invention, as N=2, described N number of resonance coil is the first resonance coil and the second resonance
Coil, described N-1 change-over switch is the first change-over switch.
On the one hand, described first change-over switch is in parallel with described first resonance coil, wherein, when described first change-over switch breaks
When opening, after described first resonance coil and described second resonance coil series connection, carry out resonant operational again, so that described Electromagnetic Heating
Device carries out low-power heating；When described first change-over switch Guan Bi, described second resonance coil individually carries out resonant operational,
So that described electromagnetic heater carries out high power heating.
On the other hand, described first change-over switch is in parallel with described second resonance coil, wherein, when described first change-over switch
During disconnection, after described first resonance coil and described second resonance coil series connection, carry out resonant operational again, so that described electromagnetism adds
Thermal carries out low-power heating；When described first change-over switch Guan Bi, described first resonance coil individually carries out resonance work
Make, so that described electromagnetic heater carries out high power heating.
In some embodiments of the invention, described change-over switch can be relay, metal-oxide-semiconductor, controllable silicon or IGBT.
According to one embodiment of present invention, described R-T tube can be IGBT.
Additionally, embodiments of the invention also proposed a kind of electromagnetic heater, it includes the humorous of above-mentioned electromagnetic heater
Shake circuit.
The electromagnetic heater of the embodiment of the present invention, uses series resonance mode to carry out resonance heating work, wherein resonance circuit
In resonance coil series connection participate in resonance so that inductance value increases, and that can reduce when R-T tube is opened well is advanced
Voltage and the temperature rise reducing R-T tube, it is to avoid R-T tube damages so that whole circuit can reliably and securely work
Make.Further, it is possible to change resonant inductance sensibility reciprocal value by the quantity changing the resonance coil participating in resonant operational, thus can
Change resonant frequency, to realize that electromagnetic heater continuous low power heats, widen the heating power model of electromagnetic heater
Enclose.
Wherein, described electromagnetic heater can include electromagnetic rice cooker, prevention electromagnetic pressure cooker and electromagnetic oven.
Brief description
The circuit diagram of the resonance circuit for the electromagnetic heater according to the embodiment of the present invention for the Fig. 1；
The circuit of the resonance circuit of electromagnetic heater when Fig. 2 disconnects for the first change-over switch according to one embodiment of the invention
Figure；
The circuit of the resonance circuit of electromagnetic heater when Fig. 3 closes for the first change-over switch according to one embodiment of the invention
Figure；And
The electricity of the resonance circuit of electromagnetic heater when Fig. 4 disconnects for the first change-over switch according to another embodiment of the present invention
Lu Tu.
Reference:
Resonance circuit 100；
R-T tube 10, controller 20, resonant capacitance C1, N number of resonance coil L1, L2, L3 ..., Ln,
N-1 change-over switch S1, S2, S3 ..., Sn-1；
Filter circuit 200；
Filter inductance L0, filter capacitor C0.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, wherein identical from start to finish
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings describe the resonance circuit of the electromagnetic heater that the embodiment of the present invention proposes and there is this resonance circuit
Electromagnetic heater.
The circuit diagram of the resonance circuit for the electromagnetic heater according to the embodiment of the present invention for the Fig. 1.As it is shown in figure 1, this electromagnetism
The resonance circuit 100 of heater includes: R-T tube 10, controller 20, resonant capacitance C1, N number of resonance coil
L1, L2, L3 ..., Ln, and N-1 change-over switch S1, S2, S3 ..., Sn-1.Wherein, N is big
In the integer equal to 2.
As it is shown in figure 1, the grounded emitter of R-T tube 10, resonant capacitance C1 is connected in parallel on sending out of R-T tube 10
Between emitter-base bandgap grading and colelctor electrode.N number of resonance coil L1, L2, L3 ..., Ln are connected in series rear and R-T tube 10
Colelctor electrode is connected, N-1 resonance line in N-1 change-over switch S1, S2, S3 ..., Sn-1 and N number of resonance coil
Circle one_to_one corresponding is in parallel.Controller 20 is connected with the control end of each change-over switch respectively, and controller 20 is by control N-1
Individual change-over switch S1, S2, S3 ..., Sn-1 are to control the quantity of the resonance coil carrying out resonant operational, to change electromagnetism
The resonant frequency of heater.Wherein, resonance coil is generally coil panel.
According to one embodiment of present invention, as shown in Figure 1, Figure 2, shown in Fig. 3 or Fig. 4, R-T tube 10 can be IGBT.
So, the resonance circuit of the electromagnetic heater of the embodiment of the present invention is by by parallel with IGBT for resonant capacitance C1, from
And constitute the mode of series resonance.
Specifically, as shown in Fig. 2, Fig. 3 or Fig. 4, as N=2, N number of resonance coil is the first resonance coil L1 and
Two resonance coil L2, N-1 change-over switch is the first change-over switch S1.
According to one embodiment of present invention, as shown in Figure 2 or Figure 3, the first change-over switch S1 and the first resonance coil
L1 is in parallel.Wherein, when the first change-over switch S1 disconnects, after the first resonance coil L1 and the second resonance coil L2 series connection
Carry out resonant operational again, so that electromagnetic heater carries out low-power heating, specifically as shown in Figure 2；When the first change-over switch
During S Guan Bi, the second resonance coil L2 individually carries out resonant operational, so that electromagnetic heater carries out high power heating, specifically
As shown in Figure 3.
It is to say, by the disconnection and the Guan Bi that control the first change-over switch S1, the resonant inductance that resonance circuit runs can be changed
Value.When the first change-over switch S1 disconnects, L1 and L2 series connection participates in resonance, as shown in Figure 2；When the first change-over switch
During S1 Guan Bi, L1 is in short-circuit condition, is not involved in the operation of resonance circuit, and L2 participates individually in the resonance of circuit, such as Fig. 3
Shown in.Therefore, when the first change-over switch S1 Guan Bi, L2 participates individually in resonance, and resonance circuit can be made to operate in Gao Gong
Rate state, i.e. electromagnetic heater carry out high power heating；When the first change-over switch S1 disconnects, after L1 connects with L2
Participating in resonance again, the inductance value carrying out resonance increases, and can reduce leading voltage when IGBT opens well, reduces IGBT
Temperature rise, can make resonance circuit operate in low power state, i.e. electromagnetic heater carries out low-power heating, thus can widen
The heating power scope of electromagnetic heater.
Specifically, in an example of the present invention, when heating power is less than or equal to 1000W, electromagnetic heater
Main control chip i.e. controller is defaulted as low power state, is otherwise high power state.When user operation electromagnetic heater runs
During certain high-power (such as 2000W) heating, main control chip control the first change-over switch S1 Guan Bi, resonance circuit is joined with L2
Run with the mode of resonance.When user operation electromagnetic heater runs certain small-power (such as 500W) heating, master control core
Piece control the first change-over switch S1 disconnects, and resonance circuit runs in the way of L2+L1 (L2 and L1 series connection) participates in resonance.
According to another embodiment of the invention, as shown in Figure 4, the first change-over switch S1 and the second resonance coil L2 is in parallel,
Wherein, when the first change-over switch S1 disconnects, carry out humorous after the first resonance coil L1 and the second resonance coil L2 series connection again
Shake work, so that electromagnetic heater carries out low-power heating；When the first change-over switch S1 Guan Bi, the first resonance coil
L1 individually carries out resonant operational, so that electromagnetic heater carries out high power heating.
Wherein, as shown in Figure 1, Figure 2, shown in Fig. 3 or Fig. 4, electromagnetic heater also includes by filter inductance L0 and filtered electrical
Hold the filtration module 200 that C0 is constituted, for voltage stabilizing process is filtered to the power supply of 310V.
In an embodiment of the present invention, change-over switch is powerful relay, metal-oxide-semiconductor, controllable silicon or IGBT.
In sum, the resonance circuit of the electromagnetic heater of the embodiment of the present invention is by changing its topological structure, changes resonance
Mode, and the quantity of the resonance coil participating in resonance can be changed by controlling the closed and disconnected of change-over switch, humorous to change
Shake the sensibility reciprocal value of inductance, thus change the resonant frequency of electromagnetic heater.
The resonance circuit of electromagnetic heater according to embodiments of the present invention, is carried out to control by controlling N-1 change-over switch
The quantity of the resonance coil of resonant operational, and after the resonance coil carrying out resonant operational is connected in series and the collection of R-T tube
Electrode is connected, and resonant capacitance is connected in parallel between the emitter stage of R-T tube and colelctor electrode, therefore, and the electricity of the embodiment of the present invention
The resonance circuit of magnetic heater uses series resonance mode to carry out resonant operational, and resonance coil series connection participates in resonance so that electricity
Sensibility reciprocal increases, and can reduce leading voltage when R-T tube is opened and the temperature rise of reduction R-T tube well, it is to avoid
R-T tube damages so that circuit can reliably and securely work.Further, by changing the resonance participating in resonant operational
The quantity of coil changes resonant inductance sensibility reciprocal value, thus can change the resonant frequency of electromagnetic heater, to realize that electromagnetism adds
Thermal continuous low power heats, and has widened the heating power scope of electromagnetic heater.
Additionally, embodiments of the invention also proposed a kind of electromagnetic heater, it includes the humorous of above-mentioned electromagnetic heater
Shake circuit.
Wherein, electromagnetic heater can include electromagnetic rice cooker, prevention electromagnetic pressure cooker and electromagnetic oven.
The electromagnetic heater of the embodiment of the present invention, uses series resonance mode to carry out resonance heating work, wherein resonance circuit
In resonance coil series connection participate in resonance so that inductance value increases, and that can reduce when R-T tube is opened well is advanced
Voltage and the temperature rise reducing R-T tube, it is to avoid R-T tube damages so that whole circuit can reliably and securely work
Make.Further, it is possible to change resonant inductance sensibility reciprocal value by the quantity changing the resonance coil participating in resonant operational, thus can
Change resonant frequency, to realize that electromagnetic heater continuous low power heats, widen the heating power model of electromagnetic heater
Enclose.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specific example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiment described in this specification or example and different embodiment or example can be combined by art personnel
And combination.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or
The implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or hidden
Include at least one this feature containing ground.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
Any process described otherwise above or method describe and are construed as in flow chart or at this, represent and include one
Or more are for realizing module, fragment or the part of the code of the executable instruction of the step of specific logical function or process,
And the scope of the preferred embodiment of the present invention includes other realization, wherein can not press order that is shown or that discuss,
Including according to involved function while basic in the way of or in the opposite order, perform function, this should be by the present invention's
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is possible to be considered as reality
The sequencing list of the executable instruction of existing logic function, may be embodied in any computer-readable medium, for instruction
Execution system, device or equipment (system such as computer based system, including processor or other can perform from instruction
System, device or equipment instruction fetch the system performing instruction) use, or combine these instruction execution systems, device or set
Standby and use.For the purpose of this specification, " computer-readable medium " can be any can to comprise, store, communicate, propagate
Or transmission procedure for instruction execution system, device or equipment or combines these instruction execution systems, device or equipment and uses
Device.The more specifically example (non-exhaustive list) of computer-readable medium includes following: have one or more cloth
The electrical connection section (electronic installation) of line, portable computer diskette box (magnetic device), random access memory (RAM), only
Reading memory (ROM), erasable read-only storage (EPROM or flash memory) of editing, fiber device, and
Portable optic disk read-only storage (CDROM).In addition, computer-readable medium can even is that can print on it described
The paper of program or other suitable media, because then can carry out for example by carrying out optical scanner to paper or other media
Edit, interpret or be processed to electronically obtain described program with other suitable methods if desired, then stored
In computer storage.
It should be appreciated that each several part of the present invention can be realized by hardware, software, firmware or combinations thereof.In above-mentioned reality
Execute in mode, the software that multiple steps or method can be performed in memory and by suitable instruction execution system by storage or
Firmware realizes.For example, if realized with hardware, and the same in another embodiment, available well known in the art under
Any one in row technology or their combination realize: have the logic gates for realizing logic function to data-signal
Discrete logic, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), existing
Field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that and realize that all or part of step that above-described embodiment method is carried is can
Completing to instruct related hardware by program, described program can be stored in a kind of computer-readable recording medium,
This program upon execution, including one or a combination set of step of embodiment of the method.
Additionally, each functional unit in each embodiment of the present invention can be integrated in a processing module, it is also possible to be each
Individual unit is individually physically present, it is also possible to two or more unit are integrated in a module.Above-mentioned integrated module was both
The form that can use hardware realizes, it would however also be possible to employ the form of software function module realizes.If described integrated module with
The form of software function module realizes and as independent production marketing or when using, it is also possible to be stored in a computer-readable
Take in storage medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although above it has been shown and described that
Embodiments of the invention, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as limitation of the present invention,
Above-described embodiment can be changed, changes, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (8)
1. the resonance circuit of an electromagnetic heater, it is characterised in that include:
R-T tube, the grounded emitter of described R-T tube；
Resonant capacitance, described resonant capacitance is connected in parallel between emitter stage and the colelctor electrode of described R-T tube；
N number of resonance coil, described N number of resonance coil is connected with the colelctor electrode of described R-T tube after being connected in series, wherein,
N is the integer more than or equal to 2；
N-1 change-over switch, described N-1 change-over switch is with N-1 resonance coil in described N number of resonance coil one by one
Corresponding in parallel；
Controller, described controller is connected with the control end of each change-over switch respectively, and described controller is by the described N-1 of control
Individual change-over switch is to control the quantity of the resonance coil carrying out resonant operational, to change the resonant frequency of described electromagnetic heater.
2. the resonance circuit of electromagnetic heater as claimed in claim 1, it is characterised in that as N=2, described N
Individual resonance coil is the first resonance coil and the second resonance coil, and described N-1 change-over switch is the first change-over switch.
3. the resonance circuit of electromagnetic heater as claimed in claim 2, it is characterised in that described first change-over switch with
Described first resonance coil is in parallel, wherein,
When described first change-over switch disconnects, carry out humorous after described first resonance coil and described second resonance coil series connection again
Shake work, so that described electromagnetic heater carries out low-power heating；
When described first change-over switch Guan Bi, described second resonance coil individually carries out resonant operational, so that described electromagnetism adds
Thermal carries out high power heating.
4. the resonance circuit of electromagnetic heater as claimed in claim 2, it is characterised in that described first change-over switch with
Described second resonance coil is in parallel, wherein,
When described first change-over switch disconnects, carry out humorous after described first resonance coil and described second resonance coil series connection again
Shake work, so that described electromagnetic heater carries out low-power heating；
When described first change-over switch Guan Bi, described first resonance coil individually carries out resonant operational, so that described electromagnetism adds
Thermal carries out high power heating.
5. the resonance circuit of the electromagnetic heater as according to any one of claim 1-4, it is characterised in that described conversion
Switch is relay, metal-oxide-semiconductor, controllable silicon or IGBT.
6. the resonance circuit of electromagnetic heater as claimed in claim 1, it is characterised in that described R-T tube is
IGBT。
7. an electromagnetic heater, it is characterised in that include the Electromagnetic Heating dress as according to any one of claim 1-6
The resonance circuit put.
8. electromagnetic heater as claimed in claim 7, it is characterised in that described electromagnetic heater includes electromagnetism electricity meal
Pot, prevention electromagnetic pressure cooker and electromagnetic oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162048.7A CN106162966A (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heater and resonance circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162048.7A CN106162966A (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heater and resonance circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106162966A true CN106162966A (en) | 2016-11-23 |
Family
ID=57335625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510162048.7A Pending CN106162966A (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heater and resonance circuit |
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| Country | Link |
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| CN (1) | CN106162966A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793223A (en) * | 2017-03-31 | 2017-05-31 | 杨作峰 | A kind of single tube drives electromagnetic heating circuit |
| 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 |
| CN113654676A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement circuit and cooking device |
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| CN2822091Y (en) * | 2005-09-02 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Electromagnetic oven resonant circuit for realizing continuous low power to high power output |
| CN203708523U (en) * | 2013-12-20 | 2014-07-09 | 美的集团股份有限公司 | Control circuit for electromagnetic heating device and electromagnetic heating device |
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2015
- 2015-04-07 CN CN201510162048.7A patent/CN106162966A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2822091Y (en) * | 2005-09-02 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Electromagnetic oven resonant circuit for realizing continuous low power to high power output |
| CN203708523U (en) * | 2013-12-20 | 2014-07-09 | 美的集团股份有限公司 | Control circuit for electromagnetic heating device and electromagnetic heating device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793223A (en) * | 2017-03-31 | 2017-05-31 | 杨作峰 | A kind of single tube drives electromagnetic heating circuit |
| 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 |
| CN113654676A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement circuit and cooking device |
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Application publication date: 20161123 |