CN105246182B - Electromagnetic induction heater and its multi-resonant circuit - Google Patents
Electromagnetic induction heater and its multi-resonant circuit Download PDFInfo
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- CN105246182B CN105246182B CN201510691883.XA CN201510691883A CN105246182B CN 105246182 B CN105246182 B CN 105246182B CN 201510691883 A CN201510691883 A CN 201510691883A CN 105246182 B CN105246182 B CN 105246182B
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Abstract
The present invention relates to electromagnetic induction heater and its multi-resonant circuit, which includes：With the first resonance circuit for being connected to the first synchronous circuit, the IGBT1 that the first driver is connected by input terminal drives；With the second resonance circuit for being connected to the second synchronous circuit, the IGBT2 that the second driver is connected by input terminal drives；And conversion circuit, the first synchronous circuit or the second synchronous circuit are selected by the conversion circuit, first, second resonance circuit is converted into parallel connection and is worked at the same time.For electromagnetic induction heater with the multi-resonant circuit, it can be achieved that inner ring coil, outer shroud coil and inner and outer ring three kinds of operating modes of coil heats in parallel, operating mode switching control is reliable, can realize that large area is evenly heated and wide power laser heating.
Description
Technical field
The present invention relates to electromagnetic heating techniques, and in particular to a kind of multi-resonant circuit of electromagnetic induction heater and matches somebody with somebody
Put the electromagnetic induction heater of the multi-resonant circuit, such as double ring fire electromagnetic oven, electric cooker.
Background technology
Only there are one heating units for traditional electromagnetic oven, it is impossible to preferably meet the needs of various culinary arts, such as quick-fried is cooked
Deng.2 problems below this electromagnetic oven generally existing：1st, heating surface (area) (HS is small and firepower is uneven；2nd, continuous power shelves are done not low,
General minimum continuous power shelves are 1000W or so.This can seriously affect culinary art experience of user, and area is small and uneven can cause
It decocts, fry that effect is poor, and the food of the bottom of a pan part is burnt, but most food is still given birth to；Continuous power shelves do it is not low,
It is typically intermittently to be reached in proportion with high-power to reach small-power, this will influence to cook effect, for example, fried egg or cake,
Often it is present with food bottom surface since moment is high-power to have pasted, what upper strata was still given birth to；Baoshang is keeping boiling stage, greatly
Power intervals heating will be not easy to overflow, otherwise soup taste is very light, it is difficult to control Baoshang effect.
The content of the invention
The object of the present invention is to provide a kind of electromagnetic induction heater multi-resonant circuit and be equipped with the multi-resonant electricity
The double ring fire electromagnetic induction heater on road, the drawbacks of to avoid traditional electromagnetic oven with single heating unit, electric cooker etc., more
Meet the needs of various culinary arts well.
The multi-resonant circuit of electromagnetic induction heater of the present invention includes：With the first resonance for being connected to the first synchronous circuit
Circuit, the IGBT1 that the first driver is connected by input terminal drive；With the second resonance circuit for being connected to the second synchronous circuit, by defeated
Enter the IGBT2 drivings of the second driver of end connection；And a conversion circuit, pass through the first synchronous electricity of conversion circuit selection
First resonance circuit and the second resonance circuit are converted into parallel connection and worked at the same time by road or the second synchronous circuit.
Wherein, the first synchronous circuit includes the first sampling slip and comparator that are controlled by the first electronic switch, and first takes
One end of sample branch is connected with the first resonance circuit, and output terminal connects the input terminal of the comparator.Second synchronous circuit include by
The second sampling slip and the comparator of second electronic switch control, one end of the second sampling slip connects with the second resonance circuit
It connects, output terminal connects the input terminal of the comparator.The conversion circuit includes the 3rd electronics for being parallel to the second electronic switch
Switch and the 4th electronic switch, the 4th electronic switch are used to first, second resonance circuit being converted into parallel connection；First drives
Dynamic device allows to set the 5th electronic switch between end and ground, and the second driver allows the 6th electronic cutting of setting between end and ground
It closes.
The control terminal of first electronic switch connects the control signal of control unit output with the control terminal of the 5th electronic switch
1, the control terminal of the second electronic switch connected with the control terminal of the 6th electronic switch control unit output control signal 2, the 3rd
The control terminal of electronic switch connects the conversion signal of control unit output with the control terminal of the 4th electronic switch, the comparator
The synchronous input end of output connection control unit；The connection control of the input terminal of the input terminal of first driver and the second driver is single
The drive pulse signal of member output.
When the control signal 1 and conversion signal are low level, and the control signal 2 is high level, first is humorous
The circuit that shakes works；When the control signal 1 is high level, and the control signal 2 and conversion signal are low level, second
Resonance circuit works；When the control signal 1,2 is low level, and the conversion signal is high level, described first,
Second resonance circuit is converted into parallel connection, selects the first synchronous circuit, and first, second resonance circuit is converted into shape in parallel
State works at the same time.
First sampling slip is made of the first resistor, second resistance and 3rd resistor being sequentially connected in series, the first electronic switch
It is connected between the common port and ground of first, second resistance.Second sampling slip is by the 4th resistance, the 5th resistance that are sequentially connected in series
And 3rd resistor, the second electronic switch are connected between the common port and ground of the four, the 5th resistance.
4th electronic switch can be the relay of switching tube driving, and two leading-out terminals of the relay connect described respectively
First, second resonance circuit.
A kind of double ring fire electromagnetic induction heater, including rectifier bridge, control unit and multi-resonant circuit；Multi-resonant electricity
Road has：The first resonance circuit of the first synchronous circuit is configured, the IGBT1 that the first driver is connected with by input terminal drives；Match somebody with somebody
The second resonance circuit of the second synchronous circuit is put, the IGBT2 that the second driver is connected with by input terminal drives；And one turn
Circuit is changed, the first synchronous circuit or the second synchronous circuit are selected by the conversion circuit, and the first resonance circuit and second is humorous
Circuit conversion of shaking is worked at the same time into parallel connection.
In described device, the first synchronous circuit is included by the first sampling slip and control unit of the control of the first electronic switch
Built-in comparator, one end of the first sampling slip are connected with first resonance circuit, and output terminal connects the defeated of the comparator
Enter end.Second synchronous circuit includes the second sampling slip and the comparator by the control of the second electronic switch, the second sampling branch
The one end on road is connected with the second resonance circuit, and output terminal connects the input terminal of the comparator.The conversion circuit includes parallel connection
In the 3rd electronic switch of the second electronic switch and the 4th electronic switch, the 4th electronic switch is used for described first, second
Resonance circuit is converted into parallel connection.First driver allows the 5th electronic switch of setting, the second driver between end and ground
Allow end and ground between set the 6th electronic switch.
The control terminal of first electronic switch connects the control signal of control unit output with the control terminal of the 5th electronic switch
1, the control terminal of the second electronic switch connected with the control terminal of the 6th electronic switch control unit output control signal 2, the 3rd
The control terminal of electronic switch connects the synchronous conversion signal of control unit output, the comparison with the control terminal of the 4th electronic switch
The synchronous input end of the output connection control unit of device；The connection control of the input terminal of the input terminal of first driver and the second driver
The drive pulse signal of unit output processed.
Described device further includes a zero cross detection circuit, and the input terminal of the zero cross detection circuit is connected with AC power,
Output terminal is connected with one input terminal of control unit, at the alternating current zero crossing moment control unit is made to export the control signal for controlling
1st, control signal 2 and conversion signal, ensureing the switching of resonance circuit can only complete at the alternating current zero crossing moment.
Described control unit has comparator etc. preferably with special integrated circuit CHK-IVT120 etc., the built-in chip type.On
Two above-mentioned synchronous circuits of composition can be facilitated by stating the first sampling slip, the second sampling slip and the comparator.
The multi-resonant circuit of electromagnetic induction heater of the present invention have the first resonance circuit that can work independently and
First, second resonance circuit can be converted into parallel connection by the second resonance circuit by conversion circuit, can by electronic switch
Two-way driving unit, synchronous circuit and resonance circuit are reliably switched with facilitating.And using electronic switch, service life
It is long, from limitations such as high pressure, electric currents.
The electromagnetic induction heater of above-mentioned multi-resonant circuit, such as double ring fire electromagnetic oven are configured, can realize inner loop-line
Circle, outer shroud coil and inner and outer ring three kinds of operating modes of coil heats in parallel, three kinds of working mode change switchings, control are reliable.Often
The power of heating unit can be controlled individually, and heating surface (area) (HS can also be freely combined, and can finally realize that large area is evenly heated and wide work(
The effect of rate laser heating can solve the FAQs of user power utilization magnetic stove culinary art, the side that user experience science and technology is allowed to bring very well
Just.
Description of the drawings
Fig. 1 is the circuit diagram of one embodiment of the invention double ring fire electromagnetic oven.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
With reference to Fig. 1, embodiment double ring fire electromagnetic oven includes rectifier bridge, control unit, multi-resonant circuit, zero cross detection circuit
And system dc power supply etc..
Multi-resonant circuit includes：The first resonance circuit of the first synchronous circuit is coupled（L2C1, L2 are inner ring coil）, by defeated
Enter the IGBT1 drivings that end is connected with the first driver；The second resonance circuit of the second synchronous circuit is coupled（L3C5, L3 are outer shroud
Coil）, the IGBT2 drivings of the second driver are connected with by input terminal；And a conversion circuit, it is selected by the conversion circuit
First synchronous circuit or the second synchronous circuit, and first, second resonance circuit is converted into parallel connection and is worked at the same time.
The drive pulse signal of the input terminal of the input terminal of first driver and the second driver connection control unit output,
First driver allows to set the 5th electronic switch SW2 between end and ground for allowing or forbidding the defeated of drive pulse signal
Enter.Second driver allow end ground between be also provided with the 6th electronic switch SW3.
First synchronous circuit is included as the ratio built in the first electronic switch SW6 the first sampling slips controlled and control unit
Compared with device（Not shown in Fig. 1）.First sampling slip is made of three resistance R1, R8, R11 being sequentially connected in series, the first electronic switch
SW6 is connected between the common port of R1, R8 and ground, for controlling the shut-off of the first sampling slip or access.First sampling slip
One end（R1 upper ends）With the first resonance circuit（L2C1）Connection, the other end（The free end of R11）Ground connection, the first sampling slip it is defeated
Outlet（That is the common port of R8, R11）The input terminal of the comparator is connected, the synchronization of the output connection of the comparator control unit is defeated
Enter end（Not shown in Fig. 1）.First resonance circuit（L2C1）, the second resonance circuit（L3C5）It is connected with rectifier bridge positive output end
Resistance R4 and resistance R9 bleeder circuits are connected between one end and ground, the reference voltage of bleeder circuit output accesses above-mentioned comparator
Comparison end.The control terminal of first electronic switch SW6 connects the control of control unit output with the control terminal of the 5th electronic switch SW2
Signal 1 processed（P3 ports）.
Second synchronous circuit includes the second sampling slip and above-mentioned comparator by the second electronic switch SW5 controls（In Fig. 1
It is not shown）.Second sampling slip is made of three resistance R3, R7, R11 being sequentially connected in series, and the second electronic switch SW5 is connected to
Between the common port and ground of R3, R7, for controlling the shut-off of the second sampling slip or access.One end of second sampling slip（On R3
End）With the second resonance circuit（L3C5）Connection, the other end（The free end of R11）Ground connection, the second sampling slip output terminal（I.e. R7,
The common port of R11）Signal access the input terminal of above-mentioned comparator.The control terminal and the 6th electronic cutting of second electronic switch SW5
Close the control signal 2 of the control terminal connection control unit output of SW3（P2 ports）.
Conversion circuit includes the 3rd electronic switch SW4 and the 4th electronic switch SW1 that are parallel to the second electronic switch SW5,
4th electronic switch SW1 is used to first, second resonance circuit being converted into parallel connection；The control of 3rd electronic switch SW4
End processed connects the conversion signal of control unit output with the control terminal of the 4th electronic switch SW1（P1 ports）.4th electronic switch
SW1 is the relay of switching tube driving, and two leading-out terminals of the relay connect first, second resonance circuit respectively.
Traditional circuit may be employed in zero cross detection circuit, and the input terminal of zero cross detection circuit is connected with AC power, output
End is connected with one input terminal of control unit, at the alternating current zero crossing moment control unit is made to export the control signal 1 for controlling（P3
Port）, control signal 2（P2 ports）And conversion signal（P1 ports）, ensure that the switching of resonance circuit can only be in alternating current zero crossing
It carves and completes.
Above-mentioned 4th electronic switch SW1 can be the relay of switching tube driving, and two leading-out terminals of relay connect respectively
Connect first, second resonance circuit.Switching transistor, MOS may be employed in above-mentioned electronic switch SW2, SW3, SW4, SW5, SW6
Switching tube etc..The equivalent traditional electromagnetic oven of other circuits such as the current sampling in embodiment, details are not described herein again.
The control unit of double ring fire electromagnetic oven is preferably with special integrated circuit CHK-IVT120 etc..Control unit is according to the
First, the synchronizing signal that the second synchronous circuit provides carries out three kinds of operating mode controls, control logic such as following table：
When control signal 1 and conversion signal are low level, and control signal 2 is high level, the first resonance circuit
（L2C1）Work；When control signal 1 is high level, and control signal 2 and conversion signal are low level, the second resonance circuit
（L3C5）Work；When control signal 1,2 is low level, and conversion signal is high level, the first synchronous circuit is selected, and
First, second resonance circuit is converted into parallel connection and works at the same time.
Three kinds of working mode change processes are as follows：
1. inner ring heats（L2C1）Work
The control signal 2 of the P2 ports output of control unit is high level, and SW3, SW5 short circuit are driven on two and resistance R7
Shorted to earth is held, closes outer shroud resonance circuit（L3C5）Driving and synchronous, off position at outer shroud.The P3 ends of control unit
The control signal 1 of mouth output is low level, and SW2, SW6 open a way, inner ring resonance circuit（L2C1）Driving and synchronizing signal from
It influences, inner ring is in normal operating conditions.The conversion signal of the P1 ports output of control unit is low level, and SW1, SW4 are opened
Road, inner ring resonance（L2C1）With outer shroud resonance（L3C5）In autonomous working state.
2. outer shroud heats（L3C5）Work
The control signal 1 of the P3 ports output of control unit is high level, and SW2, SW6 short circuit are driven on one and resistance R8
Shorted to earth is held, closes inner ring resonance circuit（L2C1）Driving with it is synchronous, inner ring is in off position.The P2 of control unit
The control signal 2 of port output is low level, and SW3, SW5 open a way, outer shroud resonance（L3C5）Driving and synchronizing signal from shadow
It rings, outer shroud is in normal operating conditions.The conversion signal of the P1 ports output of control unit is low level, and SW1, SW4 open circuit are interior
Ring resonance（L2C1）Autonomous working state is in outer shroud resonance.
3. inner and outer rings heating work simultaneously
The P2 ports of control unit and the output of P3 ports are low level（I.e. control signal 2, control signal 1 are low level）,
SW2, SW3, SW5, SW6 open a way, and the driving of inner and outer ring resonance circuit and synchronizing signal are unaffected, and inner and outer rings are in normal
Working condition.The conversion signal of the P1 ports output of control unit is high level, SW1, SW4 short circuit, and SW4 short circuits close wherein the
Two synchronous circuits, only retain first via synchronous circuit, and SW1 short circuits make inner ring resonance（L2C1）With outer shroud resonance（L3C5）Parallel connection,
It is worked at the same time at this time by IGBT1, IGBT2 driving inner and outer ring.
Claims (8)
1. a kind of multi-resonant circuit of electromagnetic induction heater, it is characterised in that including：With being connected to the first synchronous circuit
First resonance circuit, the IGBT1 that the first driver is connected by input terminal drive；The second resonance electricity of the second synchronous circuit is coupled
Road, the IGBT2 that the second driver is connected by input terminal drive；And a conversion circuit, select first by the conversion circuit
Synchronous circuit or the second synchronous circuit, and first, second resonance circuit is converted into parallel connection and is worked at the same time；
Wherein, the first synchronous circuit includes the first sampling slip and comparator that are controlled by the first electronic switch, the first sampling branch
The one end on road is connected with the first resonance circuit, and output terminal connects the input terminal of the comparator；Second synchronous circuit is included by the
The second sampling slip and the comparator of two electronic switches control, one end of the second sampling slip connects with the second resonance circuit
It connects, output terminal connects the input terminal of the comparator；The conversion circuit includes the 3rd electronics for being parallel to the second electronic switch
Switch and the 4th electronic switch, the 4th electronic switch are used to first, second resonance circuit being converted into parallel connection；First driving
Device allows to set the 5th electronic switch between end and ground, and the second driver allows the 6th electronic cutting of setting between end and ground
It closes.
2. multi-resonant circuit according to claim 1, it is characterised in that：4th electronic switch is the relay of switching tube driving
Device, two leading-out terminals of the relay connect first, second resonance circuit respectively；First sampling slip by be sequentially connected in series first
Resistance, second resistance and 3rd resistor composition, the first electronic switch are connected between the common port and ground of first, second resistance；
Second sampling slip is connected to by the 4th resistance, the 5th resistance and the 3rd resistor that are sequentially connected in series, the second electronic switch
4th, between the common port and ground of the 5th resistance.
3. multi-resonant circuit according to claim 1 or 2, it is characterised in that：The control terminal of first electronic switch and the 5th
The control signal 1 of the control terminal connection output of electronic switch, the control of the control terminal of the second electronic switch and the 6th electronic switch
The control signal 2 of end connection control unit output, the control terminal of the 3rd electronic switch are connected with the control terminal of the 4th electronic switch
The input terminal connection control unit output of the conversion signal of control unit output, the input terminal of the first driver and the second driver
Drive pulse signal, the comparator output connection control unit synchronous input end.
4. multi-resonant circuit according to claim 3, it is characterised in that：When the control signal 1 and conversion signal are low
Level, and the control signal 2 be high level when, the first resonance circuit work；When the control signal 1 be high level, and
And the control signal 2 and conversion signal be when being low level, the work of the second resonance circuit；When the control signal 1,2 is low
Level, and when the conversion signal is high level, the first synchronous circuit is selected, first, second resonance circuit is converted into parallel connection
State works at the same time.
5. a kind of double ring fire electromagnetic induction heater, including rectifier bridge and control unit, it is characterised in that further include multi-resonant
Circuit, the multi-resonant circuit have：With the first resonance circuit for being connected to the first synchronous circuit, the first driver is connected by input terminal
IGBT1 driving；With the second resonance circuit for being connected to the second synchronous circuit, the IGBT2 that the second driver is connected by input terminal drives
It is dynamic；And a conversion circuit, the first synchronous circuit or the second synchronous circuit are selected by the conversion circuit, and by first, the
Two resonance circuits are converted into parallel connection and work at the same time；
Wherein, the first synchronous circuit is included as the comparison built in the first sampling slip and control unit of the first electronic switch control
Device, one end of the first sampling slip are connected with the first resonance circuit, and output terminal connects the input terminal of the comparator；Second is synchronous
Circuit includes the second sampling slip and the comparator by the control of the second electronic switch, one end of the second sampling slip and second
Resonance circuit connects, and output terminal connects the input terminal of the comparator；The conversion circuit includes being parallel to the second electronic switch
The 3rd electronic switch and the 4th electronic switch, the 4th electronic switch is used to first, second resonance circuit being converted into shape in parallel
State；First driver allows to set the 5th electronic switch between end and ground, and the second driver allows to set between end and ground
6th electronic switch.
6. device according to claim 5, it is characterised in that：The control terminal of first electronic switch and the 5th electronic switch
The control terminal of the control signal 1 of control terminal connection control unit output, the control terminal of the second electronic switch and the 6th electronic switch
The control signal 2 of control unit output is connected, the control terminal of the 3rd electronic switch connects control with the control terminal of the 4th electronic switch
The conversion signal of unit processed output, the synchronous input end of the output connection control unit of the comparator, the first driver it is defeated
Enter the drive pulse signal that end connects control unit output with the input terminal of the second driver.
7. device according to claim 6, it is characterised in that：Further include a zero cross detection circuit, zero passage detection electricity
The input terminal on road is connected with AC power, and output terminal is connected with one input terminal of control unit, for controlling at the alternating current zero crossing moment
Control unit is made to export the control signal 1, control signal 2 and conversion signal.
8. device according to claim 5, it is characterised in that：Described control unit is special integrated circuit CHK-
IVT120。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510691883.XA CN105246182B (en) | 2015-10-23 | 2015-10-23 | Electromagnetic induction heater and its multi-resonant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510691883.XA CN105246182B (en) | 2015-10-23 | 2015-10-23 | Electromagnetic induction heater and its multi-resonant circuit |
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| Publication Number | Publication Date |
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| CN105246182A CN105246182A (en) | 2016-01-13 |
| CN105246182B true CN105246182B (en) | 2018-05-25 |
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| CN201510691883.XA Active CN105246182B (en) | 2015-10-23 | 2015-10-23 | Electromagnetic induction heater and its multi-resonant circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6685859B2 (en) * | 2016-07-12 | 2020-04-22 | 株式会社東芝 | Semiconductor module, vehicle, and elevator |
| CN110338630B (en) * | 2018-04-03 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and heating control circuit and control method thereof |
| EP3749055B1 (en) | 2018-04-03 | 2023-03-08 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd. | Electromagnetically heated cooking utensil, and heating control circuit and method therefor |
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|---|---|---|---|---|
| US4542273A (en) * | 1983-01-28 | 1985-09-17 | Tokyo Shibaura Denki Kabushiki Kaisha | Circuit for inductive heating apparatus with multiple high frequency energy sources |
| CN1086369A (en) * | 1992-10-30 | 1994-05-04 | 台湾速普乐电机企业股份有限公司 | Double-push-pull type electromagnetic heating drive circuit |
| CN101159998A (en) * | 2007-10-30 | 2008-04-09 | 深圳市和而泰电子科技有限公司 | Synchronous control method and circuit of electromagnetic stove |
| CN203407030U (en) * | 2013-07-12 | 2014-01-22 | 深圳市鑫汇科电子有限公司 | Double-ring fire electromagnetic heating apparatus and circuit thereof |
| CN205051902U (en) * | 2015-10-23 | 2016-02-24 | 深圳市鑫汇科股份有限公司 | Electromagnetic induction heating device and many resonance circuit thereof |
-
2015
- 2015-10-23 CN CN201510691883.XA patent/CN105246182B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4542273A (en) * | 1983-01-28 | 1985-09-17 | Tokyo Shibaura Denki Kabushiki Kaisha | Circuit for inductive heating apparatus with multiple high frequency energy sources |
| CN1086369A (en) * | 1992-10-30 | 1994-05-04 | 台湾速普乐电机企业股份有限公司 | Double-push-pull type electromagnetic heating drive circuit |
| CN101159998A (en) * | 2007-10-30 | 2008-04-09 | 深圳市和而泰电子科技有限公司 | Synchronous control method and circuit of electromagnetic stove |
| CN203407030U (en) * | 2013-07-12 | 2014-01-22 | 深圳市鑫汇科电子有限公司 | Double-ring fire electromagnetic heating apparatus and circuit thereof |
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