CN108076549A - Electromagnetic heating system and household electrical appliance - Google Patents
Electromagnetic heating system and household electrical appliance Download PDFInfo
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- CN108076549A CN108076549A CN201611096779.7A CN201611096779A CN108076549A CN 108076549 A CN108076549 A CN 108076549A CN 201611096779 A CN201611096779 A CN 201611096779A CN 108076549 A CN108076549 A CN 108076549A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 230000005611 electricity Effects 0.000 claims description 12
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- 230000033228 biological regulation Effects 0.000 description 4
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- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
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Classifications
-
- 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
-
- 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
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/129—Cooking devices induction ovens
-
- 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
- H05B6/36—Coil arrangements
-
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electronic Switches (AREA)
- General Induction Heating (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
The embodiment of the present invention provides a kind of electromagnetic heating system and household electrical appliance, belongs to electronic circuit technology field.Wherein the electromagnetic heating system includes：Coil panel, control circuit and power circuit, the coil panel include inner ring terminal and outer ring terminal, and power circuit includes wave filter；And the inner ring terminal of coil panel is connected to the control circuit；And the outer ring terminal of the coil panel is connected to the wave filter.Thereby, it is possible to shake that is simple, inexpensively realizing the ground signal for reducing electromagnetic heating circuit, and the interference to other circuits in power grid and power grid is reduced, to improve the advantageous effect of the Electro Magnetic Compatibility of circuit.
Description
Technical field
The present invention relates to technical field of electromagnetic compatibility, and in particular, to a kind of electromagnetic heating system and household electrical appliance.
Background technology
Electrical equipment is connected to power grid by power cord, and the interference signal that electrical equipment itself generates can pass through power cord
It passes on power grid, online other equipment is formed and is endangered.For this purpose, household electrical appliances EMC (Electro Magnetic are formulated
Compatibility Electro Magnetic Compatibilities) test regulation define conduction test frequency range, with ensure electrical equipment access power grid
Signal contamination will not be caused to power grid.EMC includes the requirement of two aspects：One refers to equipment in normal course of operation to institute
In the electromagnetic interference that environment generates no more than certain limit value；The second is finger device tool is to electromagnetic interference present in the environment of place
With a degree of immunity to interference, i.e. electromagnetic susceptibility.
On the one hand, in order to be tested by household electrical appliances EMC, household electrical appliances business men needs to add EMC filter circuit for household appliances.It is existing
Multiple-order low-pass filter circuit is added generally by power end in technology, and the multiple-order low-pass filter circuit is used more and is based on
The mode of the second-order filter of common mode inductance so that household appliances can be tested by EMC；But merely using multiple-order low-pass
Filter circuit can cause production cost to increase, while also increase circuit design in household appliances to promote the EMC surpluses of household electrical appliances
Complexity.
On the other hand, with the revision of new household electrical appliances EMC test regulation in 2016, by the frequency range of conduction test by
150kHz~30MHz is changed to 9KHz~30MHz.Obviously, filtered for the EMC designed by old household electrical appliances EMC test laws and regulations requirements
Circuit can not meet the requirement of EMC test regulations compared with the filter effect of household appliances.
It follows that it is a design it is simple, of low cost and promoted circuit EMC surpluses circuit design be current industry
The popular research direction on boundary.
It is found it should be noted that Yi Shang technical problem is the present inventor during the present invention is put into practice.
The content of the invention
The object of the present invention is to provide a kind of design ground signals simple, of low cost and can reducing electromagnetic heating circuit
Shake, reduce the interference to other circuits in power grid and power grid, improve the Electro Magnetic Compatibility of circuit electromagnetic heating system and
Household electrical appliance, at least solve in background technology elaboration the technical issues of.
To achieve these goals, on the one hand the embodiment of the present invention provides a kind of electromagnetic heating system, the electromagnetic heating system
System includes coil panel, control circuit and power circuit,
The coil panel includes inner ring terminal and outer ring terminal, and above-mentioned power circuit includes wave filter；And
The inner ring terminal of above-mentioned coil panel is connected to above-mentioned control circuit；And the outer ring terminal of above-mentioned coil panel is connected to
Above-mentioned wave filter.
Preferably, above-mentioned power circuit is DC power supply circuit, and above-mentioned DC power supply circuit includes rectifier bridge and above-mentioned
Wave filter is additionally coupled to the DC output end of above-mentioned rectifier bridge.
Preferably, above-mentioned wave filter is the LC wave filters comprising inductance and capacitance.
Preferably, which is connected to electricity network, and the output voltage of the inner ring terminal of above-mentioned coil panel is
The output voltage of the outer ring terminal of 310V and above-mentioned coil panel is 1000V.
Preferably, above-mentioned control circuit is included to control the switch of above-mentioned coil panel break-make and connected with above-mentioned switch
The switch driving circuit connect；Wherein above-mentioned switch driving circuit inputs one for receiving control signal according to the control signal
Driving voltage is to above-mentioned switch, so as to control the on or off of above-mentioned switch.
Preferably, above-mentioned switch is managed for IGBT and the collector of above-mentioned IGBT pipes is connected to the inner ring of above-mentioned coil panel
Terminal.
Preferably, which includes：Resistance, in above-mentioned switch driving circuit and/or the above-mentioned switch
The output terminal of driving circuit, for extending above-mentioned switch driving circuit from above-mentioned control signal is received to above-mentioned switch is controlled to move
Time needed for making.
Preferably, when above-mentioned resistance is located at the output terminal of above-mentioned switch driving circuit, the resistance value of above-mentioned resistance is 10 Europe
- 100 ohm of nurse.
On the other hand the embodiment of the present invention provides a kind of household electrical appliance, include electromagnetic heating system described above.
Preferably, which is electromagnetic oven, electric cooker, electric pressure cooking saucepan or insulating pot.
Through the above technical solutions, the outer ring terminal that can export high-voltage signal for limiting coil panel is connected to filtering
The power circuit of device to reduce influence of the coil panel to master control on-board filter part, greatly reduces coil panel and is directly coupled to electricity
Interference signal on the line of source, thus, it is possible to simply, inexpensively realize the shake of the ground signal of reduction electromagnetic heating circuit,
And the interference to other circuits in power grid and power grid is reduced, to improve the advantageous effect of the Electro Magnetic Compatibility of circuit.
The other feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, under
The specific embodiment in face is together for explaining the embodiment of the present invention, but do not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is the structure diagram of the electromagnetic heating system of one embodiment of the invention；
Fig. 2 is the structure diagram of the electromagnetic heating system of another embodiment of the present invention；
Fig. 3 A-3C are the circuit connection diagrams that resistance element is set in switch driving circuit different position；
Fig. 4 A are the switch driving circuit connection figures of one embodiment of the present invention；
Fig. 4 B-4E are the switch driving circuit connection figures that resistance element is set to different position in Figure 4 A；
Fig. 5 is the switch driving circuit connection figure of another embodiment of the present invention；
Fig. 6 is the electromagnetic heating Household appliance control circuit connection figure of one embodiment of the present invention.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Those skilled in the art of the present technique are appreciated that the wording " comprising " used in the specification of the present invention refers to that there are upper
Feature, integer, step, operation, element and/or component are stated, but it is not excluded that other one or more features of presence or addition,
Integer, step, operation, element, component and/or combination thereof.It should be understood that when we claim element to be " connected " or " coupling "
During to another element, it can be directly connected or coupled to other elements or there may also be intermediary elements.In addition, here
" connection " or " coupling " used can include wireless connection or wireless coupling.Wording "and/or" used herein includes one
Or more the whole of associated list items or any cell and all combine.
The structure diagram of the electromagnetic heating system of one embodiment of the invention is illustrated that referring to Fig. 1, the electromagnetic heating system
System 10 includes coil panel 101, control circuit 102 and power circuit 103, which includes inner ring terminal 1011 and outer ring
Terminal 1012, power circuit 103 include wave filter 1031；Wherein outer ring terminal 1011 is connected to wave filter 1031, coil panel
Outer ring terminal 1012 is connected to control circuit 103.Due to coil panel at work, the output voltage of the leading-out terminal of outer ring terminal
Higher than inner ring terminal, such as：When the electromagnetic heating system 20 is accessed alternating current network, in the inner ring terminal of coil panel 201
2011 output voltage is 310V and the output voltage of the outer ring terminal 2012 of coil panel 201 is 1000V, and by this technology
The high voltage output terminal of coil panel is connected to wave filter by scheme by limiting, and inner ring terminal is connected to compared to by wave filter,
The filtering performance of wave filter can be more made full use of, greatly reduces the interference signal that coil panel is directly coupled on power cord,
Promote the EMC surpluses of circuit；It is asked using the terminal connection of coil panel is limited in the present embodiment with solving to be promoted the technology of EMC surpluses
Topic is that current industry is no disclosed, but what the present inventor was had found during the present invention is put into practice.
More specifically, it is illustrated that a kind of structure diagram of the electromagnetic heating system under specific embodiment referring to Fig. 2, such as
Shown in Fig. 2, which includes coil panel 201, DC power supply circuit 203 and control circuit 202, in direct current
In source circuit 203 outer ring of coil panel 201 is connected to comprising rectifier bridge 2032 and wave filter 2031, the output terminal of wave filter 2031
Terminal 2012, the input terminal of wave filter 2031 are connected to rectifier bridge 2032, can realize in 203 side of DC power supply by fully setting
The wave filter in the high voltage output terminal side of coil panel 201 is put, makes full use of the filtering performance of wave filter to improve the electricity of circuit
Magnetic filtering performance；The switch 2021 for the inner segment terminal for being connected to coil panel 201 is included in control circuit 202 and is connected with switch 2021
The switch driving circuit 2022 connect, wherein switch driving circuit 2022 are used to receive control signal, and defeated according to the control signal
Enter a driving voltage to switching 2021, so as to control the on or off of the switch 2021；It is achieved in based on control circuit 202
Complete the control work to coil panel 201.
In the present invention, in the case where not making explanation on the contrary, when referred to hereinafter, term " switch " refers to can be with
Break-make control is realized by electric signal or the switch of break-make control is realized according to the characteristic of component itself, such as MOSFET,
Triode or IGBT or the IGBT with inverse parallel fly-wheel diode；When referred to hereinafter, term " damping element " refers to arbitrarily
Setting electricity is reached by the control terminal/grid for having flowed inhibition to reduce accumulation speed, extension switchs to electric current
The device of pressure, such as can be resistance etc..
It is necessary to be noted that the switch of the present invention removes the break-make that can be used for control electromagnetic heating coil, may be used also
For controlling the break-make of other components or circuit.
For accessing the circuit of power grid, the electric current of other loads of power grid can be caused in the moment of switch conduction/shut-off
Interference.Electromagnetic heating household electrical appliances generally use control switch conduction/shut-off by DC inverter be high frequency electric, by the high frequency electric
The mode for being passed through electromagnetic heating coil heats, and the frequent break-make of switch makes power grid generation is apparent to shake, disclosed in present invention continuation
Switch driving circuit can further improve Electric Circuit Electromagnetic Compatibility EMC, to reduce interference of the circuit to power grid.
Fig. 3 A-3C are the connection figures of the switch driving circuit of different embodiments of the present invention.This hair as shown in figs. 3 a-3 c
The switch driving circuit of bright three kinds of embodiments, the switch K are used to control the break-make of electromagnetic heating coil, switch drive electricity
Road inputs a driving voltage Ud to the switch K for receiving control signal according to the control signal, so as to control described open
The on or off of K is closed, which includes：Resistance element, in the switch driving circuit and/or this is described
The driving voltage output terminal of switch driving circuit, for extending the switch driving circuit from the control signal is received to control
Make the time needed for the switch motion.Electromagnetic heating system provided by the present invention creatively should by resistance element as a result,
Used in that in switch driving circuit, can realize improvement Electric Circuit Electromagnetic Compatibility to a certain extent, and combination present invention implementation
The example wave filter described above in coil panel high-pressure side one side, realize improves Electric Circuit Electromagnetic Compatibility simultaneously in the both sides of coil panel
Property is effectively improved the Electro Magnetic Compatibility for the EMC system that the embodiment of the present invention is provided, and in the embodiment of the present invention
The implementation of EMC improving countermeasures contributes to the popularization of technical solution of the present invention also without more fringe cost is put into.
In said program, switch that electromagnetic heating coil or other elements is controlled to be connected with control power supply VCC, switch drives
Dynamic circuit receives control signal PPG, and driving voltage VCC is input to switch K according to control signal PPG, so that switch K is led
It is logical, realize control electromagnetic heating coil or other elements access power supply；Switch driving circuit will drive according to control signal PPG
Voltage is disconnected from switch K, so that switch K shut-offs, realize that control electromagnetic heating coil or other elements are disconnected from power supply.
For the on or off of delay switch, the driving voltage in the switch driving circuit or in the driving circuit
Output terminal Ud sets resistance element, to generate inhibition to electric current, makes to receive the control signal PPG from switch driving circuit
To the time lengthening of control switch K ON/OFF, the responsiveness of switch K is reduced, is reduced to other circuit/electric appliances in power grid
Interference, improve the Electro Magnetic Compatibility of circuit.
Fig. 3 A are the circuit connection diagram that resistance element is set in the driving voltage output terminal Ud of switch driving circuit, and Fig. 3 B are
The circuit connection diagram of resistance element is set in switch driving circuit, and Fig. 3 C are the driving voltage output terminal in switch driving circuit
Ud is set and the interior circuit connection diagram for setting resistance element of switch driving circuit.
As shown in figs. 3 a-3 c, the setting of damping element, it is intended to reduce the electric current of driving circuit, reduce charge in circuit
Aggregation velocity makes the time lengthening for the voltage for reaching switch conduction；And the moment in switch OFF, reduce the speed of circuit discharging
Degree extends the switch-off time.
Fig. 3 A are the switch driving circuit connection figure of one embodiment of the present invention.A kind of reality of the present invention as shown in Figure 5
The switch driving circuit of mode is applied, including：The grid of the first transistor T1, the first transistor T1 receive the control signal
PPG, collector connect voltage source (+18V), emitter ground connection；And second transistor T2 and third transistor T3, second crystal
The collector of pipe T2 connects voltage source (+18V), and emitter is connected with the emitter of the third transistor T3, the 3rd crystal
The grid of pipe T2 grounded collectors, second transistor T2 and third transistor T3 are connected to the collection of the first transistor T1
Electrode, wherein the driving voltage, that is, voltage source (+18V) output terminal Ud be located at the emitter of the second transistor T2 with it is described
At the tie point of the emitter of third transistor T3.
In said program, control signal PPG, emitter ground connection are received by the grid of the first transistor T1, collector connects
Voltage source, for voltage source as driving voltage, voltage source may be, for example, the power supply of 18V, and the first transistor T1 grids connect control letter
Number PPG may be, for example, the square wave that high level is 5V, low level is 0V；When control signal PPG is low level, that is, 0V, first crystal
When pipe T1 is turned off, second transistor T2 conductings, driving voltage (+18V) is input to switch K through second transistor T2, leads switch
It is logical；When control signal PPG is high level, the first transistor T1 conductings, second transistor T2 grids are pulled to near-earth voltage, the
Two-transistor T2 is turned off, and third transistor T3 is instantaneously turned on, and is switched and is discharged through third transistor T3, and after electric discharge, switch K is closed
It is disconnected, third transistor T3 shut-offs.
Fig. 4 B-4D are the circuit connection diagrams to setting resistance element on the basis of the embodiment of Fig. 4 A.As shown in Figure 4 B
A kind of embodiment switch driving circuit, including the first resistance element R1, be connected on the driving voltage output terminal and institute
State switch K between.Resistive member is set between the emitter joint and switch of second transistor T2 and third transistor T3
Part R1 is low level in control signal PPG, and when the first transistor T1 shut-offs and second transistor T2 are turned on, driving voltage is through the
Two-transistor T2 and the first resistance element R1 access switches, electric current of the driving voltage through second transistor T2 to switch reduce, electricity
Lotus gathers to obtain the time lengthening of voltage needed for switch K conductings, so as to extend the time of switch K conductings；It is in control signal PPG
During high level, when the first transistor T1 conductings and second transistor T2 are turned off, third transistor T3 is instantaneously turned on, and switch K is through the
One resistance element R1 and third transistor T3 discharges to ground, and because setting the first resistance element R1, discharge current reduces, the velocity of discharge
Slow down, so as to extend the time that electric discharge terminates, make the time lengthening of switch OFF.
In above-described embodiment, the first resistance element R1 be arranged to connect simultaneously conducting branches where second transistor T2 and
Shut-off branch where third transistor T3, when conducting branches and shut-off branch work respectively, switch is realized in both accesses
Turn-on and turn-off be delayed by, reduce the turn-on and turn-off speed of switch.
A kind of switch driving circuit of embodiment as shown in Figure 4 C including the second resistance element R2, is connected on described
Between the collector of voltage source and the second transistor T2.The switch driving circuit of the present embodiment sets on conducting branches
Two resistance elements are connected between the collector and driving voltage of second transistor T2, then are low level in control signal PPG,
The first transistor T1 turn off and second transistor T2 turn on when, driving voltage connects through the second resistance element R2 and second transistor T2
Enter switch, electric current of the driving voltage through second transistor T2 to switch reduces, and charge buildup reaches voltage needed for switch conduction
Time lengthening, so as to extend the time of switch K conductings.
A kind of switch driving circuit of embodiment as shown in Figure 4 D including the 3rd resistance element R3, is connected on described
Between the emitter of driving voltage output terminal and the third transistor T3.The switch driving circuit of the embodiment is in shut-off branch
Set resistance element R3, control signal be high level when, the first transistor T1 conducting and second transistor T2 turn off when, the 3rd
Transistor T3 is instantaneously turned on, and is switched and is discharged through the 3rd resistance element R3 and third transistor T3 to ground, because setting the 3rd resistive yuan
Part R3R3, discharge current reduce, and the velocity of discharge slows down, and so as to extend the time that electric discharge terminates, make the time lengthening of switch OFF.
The embodiment for resistance element difference installation position of Fig. 4 B-4D, three kinds of resistance elements can be separately provided, also may be used
Setting is combined according to the design needs, such as simultaneously the first resistance element R1 and the second resistance element R2 is set to set simultaneously
First resistance element R1 and the 3rd resistance element R3 while the second resistance element R2 and the 3rd resistance element R3 or simultaneously is set
First resistance element R1, the second resistance element R2 and the 3rd resistance element R3 are set.
Fig. 4 E are the switch driving circuit connection figures of one embodiment of the present invention, the switch driving circuit of the embodiment,
First resistance element R1, the second resistance element R2 and the 3rd resistance element R3 are set simultaneously.The switch driving circuit of the embodiment,
Control signal be low level, the first transistor T1 shut-off and second transistor T2 turn on when, driving voltage is through second resistive yuan
Part R2, second transistor T2 and the first resistance element R1 access switches, driving voltage is through second transistor T2 to the electric current of switch
Reduce, charge buildup obtains the time lengthening of voltage needed for switch conduction, so as to extend the time of switch K conductings；Believe in control
Number be high level when, the first transistor T1 conducting and second transistor T2 turn off when, third transistor T3 is instantaneously turned on, switch K
Through the first resistance element R1, the 3rd resistance element R3 and third transistor T3 to ground discharge, because set the first resistance element R1 and
3rd resistance element R3, discharge current reduce, and the velocity of discharge slows down, and so as to extend the time that electric discharge terminates, make switch OFF
Time lengthening.
A kind of embodiment according to the present invention, the resistance element are resistance.
A kind of embodiment according to the present invention, the switch can be one kind in IGBT pipes, triode or field-effect tube.
In embodiment shown in Fig. 4 B-4E, the switch of switch driving circuit driving uses IGBT.Driving voltage output terminal Ud
The grid of control IGBT is input to, to control the on or off of IGBT, in said program, R1, R2, R3 is set to optimize electricity
Road improves the Electro Magnetic Compatibility of circuit.R3 is used to adjust the turn-off speed of IGBT, and resistance value is bigger, and the turn-off speed of IGBT is slower,
The effect for improving EMC is better.When R3 be less than 30 ohm, for the improvement unobvious of EMC；More than 100 ohm, the pass of IGBT
Breakdown consumption can be very big, and it is excessively high to be easy to cause IGBT temperature, so, 30 ohm -100 ohm of R3 resistance values range of choice.
R2 is used to adjust the conducting speed of IGBT, and resistance value is bigger, and the conducting speed of IGBT is slower, and EMC effects are better.Work as R2
Less than 10 ohm, for the improvement unobvious of EMC；More than 100 ohm, the turn-off power loss of IGBT can be very big, easily makes
It is excessively high into IGBT temperature, so, 10 ohm~100 ohm of R2 resistance values range of choice.
R1 is used to adjust the turn-on and turn-off speed of IGBT, and R1 can adjust turn-on and turn-off speed simultaneously, and resistance value is bigger,
The turn-on and turn-off speed of IGBT is slower, and EMC effects are better.When R1 be less than 10 ohm, for the improvement unobvious of EMC；
More than 100 ohm, the loss of the turn-on and turn-off of IGBT can be very big, and it is excessively high to be easy to cause IGBT temperature, so, the selection of R1 resistance values
10 ohm~100 ohm of scope.
When actually debugging, R1, R2, R3 according to test result in the range of above-mentioned choosing value when for optimal value, take into account to EMC
Improvement can't in circuit switch IGBT Wen Sheng cause large effect.
Fig. 5 is the switch driving circuit connection figure of another embodiment of the present invention.A kind of embodiment as shown in Figure 5
Switch driving circuit, wherein, switch K be with inverse parallel fly-wheel diode VD IGBT pipe.
A kind of embodiment according to the present invention further includes current-limiting resistance R4, R5 and R6, R4 connection+18V voltage sources and first
The collector of transistor T1, to when the first transistor T1 is turned on to the conducting branches current limliting where the first transistor T1, it is right
It carries out overcurrent protection, and the grid of R5 connection control signal PPG and the first transistor T1 limit input control signal code
The emitter of system, the grid of R6 one end connecting valve, the other end and IGBT switches is grounded after connecing altogether.
Fig. 6 is the electromagnetic heating Household appliance control circuit of one embodiment of the present invention, includes a kind of as above embodiment
Switch driving circuit is switched and managed for IGBT, and the collector of IGBT pipes is connected to the inner ring terminal of coil panel, and transmitter is connected to electricity
Source circuit.Single phase alternating current power supply exports direct current (V+, V-) after over commutation, after π type filter circuits filter out harmonic wave, through opening
It closes IGBT and is input to electromagnetic coil.The on or off of switch IGBT is controlled through switch driving circuit by control signal, it will be straight
Galvanic electricity (V+, V-) inversion is high frequency electric, such as the high frequency electric of more than 20kHz, is passed through electromagnetic coil and electric signal is changed conclusion of the business
The electromagnetic signal of change generates vortex and magnetic hysteresis movement on heated object in the electromagnetic signal of alternation, thus generates heat.
In the above embodiment, by π types filter circuit and the time by resistance element delay switch IGBT ON/OFF
The mode being combined can meet EMC requirements and optimize cost significantly.
A kind of embodiment according to the present invention, electromagnetic heating household electrical appliances are electromagnetic oven.Such as can be other electromagnetic heatings man
Electricity, such as insulating pot, electric cooker or electric pressure cooking saucepan.
Switch IGBT is the processing units input control signal PPG controls such as the core component of electromagnetic oven, microcontroller IGBT
Switch so that coil disc of electric stove forms resonance with resonant capacitance, and magnetic energy is allowed to be converted into electric energy, and vortex is generated in cookware bottom,
It is converted into thermal energy so that cookware generates heat.The switching frequency of IGBT is probably in 20KHz~30KHz, so high switching frequency, meeting
Very big electromagnetic interference is generated to system.In order to meet EMC requirements, current way is to increase filter circuit, absorbs IGBT productions
Raw electromagnetic interference.
The heating control circuit of the electromagnetic oven of present embodiment uses the switch driving circuit of any of the above-described kind of embodiment,
The ON/OFF of IGBT is controlled, by postponing Zi time of the control signal to IGBT ON/OFF is received, reduces IGBT's
Switching speed reduces and the electromagnetic interference that system generates power grid with caused by is shaken, improves the Electro Magnetic Compatibility of circuit.
Said program by on-off circuit set resistance element, set-up mode compared with flexibly, circuit structure it is simple, be modified to
This is relatively low.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that the specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of electromagnetic heating system, which includes coil panel, control circuit and power circuit, and feature exists
In：
The coil panel includes inner ring terminal and outer ring terminal, and the power circuit includes wave filter；And
The inner ring terminal of the coil panel is connected to the control circuit；And the outer ring terminal of the coil panel be connected to it is described
Wave filter.
2. electromagnetic heating system according to claim 1, which is characterized in that the power circuit is DC power supply circuit,
The DC power supply circuit includes rectifier bridge and the wave filter is located at the DC output end of the rectifier bridge and the coil
Between the outer ring terminal of disk.
3. electromagnetic heating system according to claim 1, which is characterized in that the wave filter is comprising inductance and capacitance
LC wave filters.
4. electromagnetic heating system according to claim 1, which is connected to electricity network, and feature exists
In the output voltage of the inner ring terminal of the coil panel is 310V and the output voltage of the outer ring terminal of the coil panel is
1000V。
5. electromagnetic heating system according to claim 1, which is characterized in that the control circuit includes to control described
The switch of coil panel break-make and the switch driving circuit with the switch connection；Wherein described switch driving circuit is used to connect
Receive control signal, and a driving voltage inputted to the switch according to the control signal, so as to control the conducting of the switch or
Shut-off.
6. electromagnetic heating system according to claim 5, which is characterized in that it is described switch for IGBT pipe and it is described
The collector of IGBT pipes is connected to the inner ring terminal of the coil panel.
7. electromagnetic heating system according to claim 5, which is characterized in that the switch driving circuit includes：
Resistance, in the switch driving circuit and/or the output terminal of the switch driving circuit, for extending described open
It closes driving circuit and receives the control signal to the time controlled needed for the switch motion certainly.
8. electromagnetic heating system according to claim 7, it is characterised in that：
When the resistance is located at the output terminal of the switch driving circuit, the resistance value of the resistance is 10 ohm -100 ohm.
9. a kind of household electrical appliance include claim 1-8 any one of them electromagnetic heating systems.
10. according to the household electrical appliance described in right pressure request 9, which is characterized in that the household electrical appliance are electromagnetic oven, electric cooker, electricity
Pressure cooker or insulating pot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016110148343 | 2016-11-18 | ||
| CN201611014834 | 2016-11-18 |
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| Publication Number | Publication Date |
|---|---|
| CN108076549A true CN108076549A (en) | 2018-05-25 |
Family
ID=58723242
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096779.7A Pending CN108076549A (en) | 2016-11-18 | 2016-12-02 | Electromagnetic heating system and household electrical appliance |
| CN201611096451.5A Active CN108076548B (en) | 2016-11-18 | 2016-12-02 | Switch driving circuit, control circuit and induction cooker |
| CN201621316270.4U Expired - Fee Related CN206251363U (en) | 2016-11-18 | 2016-12-02 | Electromagnetic heating system and household electrical appliance |
| CN201621316118.6U Active CN206196077U (en) | 2016-11-18 | 2016-12-02 | Switch drive circuit , control circuit and electromagnetism stove |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096451.5A Active CN108076548B (en) | 2016-11-18 | 2016-12-02 | Switch driving circuit, control circuit and induction cooker |
| CN201621316270.4U Expired - Fee Related CN206251363U (en) | 2016-11-18 | 2016-12-02 | Electromagnetic heating system and household electrical appliance |
| CN201621316118.6U Active CN206196077U (en) | 2016-11-18 | 2016-12-02 | Switch drive circuit , control circuit and electromagnetism stove |
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| Country | Link |
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| CN (4) | CN108076549A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108076549A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and household electrical appliance |
| CN110492874A (en) * | 2019-08-20 | 2019-11-22 | 珠海格力电器股份有限公司 | Driving circuit, controller and the electrical equipment of insulated gate bipolar transistor |
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- 2016-12-02 CN CN201621316270.4U patent/CN206251363U/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| CN206196077U (en) | 2017-05-24 |
| CN108076548A (en) | 2018-05-25 |
| CN206251363U (en) | 2017-06-13 |
| CN108076548B (en) | 2024-06-18 |
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