CN108513382A - Electromagnetic heating device and power control method - Google Patents
Electromagnetic heating device and power control method Download PDFInfo
- Publication number
- CN108513382A CN108513382A CN201810136093.9A CN201810136093A CN108513382A CN 108513382 A CN108513382 A CN 108513382A CN 201810136093 A CN201810136093 A CN 201810136093A CN 108513382 A CN108513382 A CN 108513382A
- Authority
- CN
- China
- Prior art keywords
- heating
- circuit
- power
- zero cross
- electronic switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 272
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 238000004093 laser heating Methods 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000020169 heat generation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 206010037660 Pyrexia Diseases 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention provides an electromagnetic heating device and a power control method, wherein the electromagnetic heating device comprises an alternating current power supply circuit (10), a rectifying circuit (20), a filter circuit (30), a heating loop (40), a controller (50), an electronic switch (60) and a zero-crossing detection circuit (70), wherein the filter circuit (30) comprises a filter capacitor (31), the filter capacitor (31) is connected in series with the electronic switch (60) and then connected in parallel between the rectifying circuit (20) and the heating loop (40), and the input end of the zero-crossing detection circuit (70) is connected between the alternating current power supply circuit (10) and the heating loop (40); the controller (50) is respectively and electrically connected with the heating circuit (40), the control end of the electronic switch (60) and the output end of the zero-crossing detection circuit (70). The technical scheme provided by the invention can reduce the heat generation of the IGBT during low-power heating and improve the power range of the low-power heating.
Description
Technical field
The present invention relates to family's electro-technical field more particularly to a kind of electromagnetic heaters and Poewr control method.
Background technology
Electromagnetic heater is to generate vortex current, the coke of vortex current using the magnetic force line cutting cookware that coil panel generates
Effect of having burning ears makes cookware heat up, to realize heating.Electromagnetic heater is convenient and efficient due to heating, and excellent without open fire etc.
A kind of point, it has also become the very high cooking apparatus of frequency of use in people's life.
Electromagnetic heater usually has multiple power gears, and when realizing low-power heating, circuit implementations are relatively more,
Realization method relatively common at present has switching resonant capacitance and using relay+diode copped wave etc..Wherein, switching resonance electricity
The mode of appearance is that the resonant capacitance work using large capacity, low-power are switched to the humorous of low capacity when heating in high-power heating
The capacitance that shakes works；The mode of relay+diode copped wave is the unilateal conduction characteristic by diode, closes half period,
Make electromagnetic heater work 10ms, stop 10ms, realizes that power halves.
But the mode of above-mentioned switching resonant capacitance, when low-power heats, resonant frequency is very high, insulated gate bipolar
Transistor (Insulated Gate Bipolar Transistor, IGBT) loss is very big, causes IGBT calorific values very big, is
Ensure that the trouble free service of circuit, power can not be done too small；It is above-mentioned by the way of relay+diode copped wave, also due to
IGBT calorific values big reason when low-power heats, causes power that can not do too small.
Invention content
In view of this, a kind of electromagnetic heater of present invention offer and Poewr control method, for reducing IGBT low-power
Fever when heating improves the power bracket of low-power heating.
To achieve the goals above, the present invention provides a kind of electromagnetic heater, including AC power circuit, rectified current
Road, filter circuit, heating circuit and controller, AC power circuit connect the two-phase input terminal of rectification circuit, and heating circuit is simultaneously
It is associated in two phase output terminals of rectification circuit；Filter circuit includes filter capacitor, and electromagnetic heater further includes：Electronic switch and mistake
Zero detection circuit, filter capacitor are connected in parallel on after connecting with electronic switch between rectification circuit and heating circuit, zero cross detection circuit
Input terminal be connected between AC power circuit and resonance circuit；
Controller is electrically connected with the output end of heating circuit, the control terminal of electronic switch and zero cross detection circuit respectively, is used
In turning on and off according to current desired heating power control electronic switch, and when electronic switch turns off, according to current institute
Need the zero cross signal control heating circuit intermittent-heating that heating power and zero cross detection circuit export.
By increasing electronic switch and zero cross detection circuit in major loop, after electronic switch is connected with filter capacitor simultaneously
It is associated between rectification circuit and heating circuit, the input terminal of zero cross detection circuit is connected to AC power circuit and resonance circuit
Between；Turning on and off for electronic switch is controlled according to current desired heating power by controller, and when electronic switch turns off,
The zero cross signal exported according to current desired heating power and zero cross detection circuit controls heating circuit intermittent-heating, heating circuit
Output power can be always held at high-power output state, thus can be effective moreover, heating circuit does not have to continuous work
Reduction heating circuit in fever of the power switch tube when low-power heats, and then improve low-power heating power bracket；
Also, when low-power heats, filter capacitor is had turned off, thus avoids the storage of electricity, the power in heating circuit is made to open
Closing pipe can be open-minded in the corresponding zero crossing of zero cross signal under the cooperation of zero cross detection circuit, so as to avoid power switch
Pipe is opened firmly and the loss generated and noise, extends the service life of electromagnetic heater, and improve user experience.
As a kind of optional embodiment of the present invention, controller is specifically used for：It is more than in current desired heating power pre-
If when power, control electronic switch is open-minded, and controls heating circuit and use current desired heating power laser heating；In current institute
When heating power being needed to be less than or equal to predetermined power, control electronic switch shutdown, and electricity is determined according to current desired heating power
Then output power and the heating duty ratio of magnetic heating device are used according to zero cross signal and heating duty ratio control heating circuit
Output power intermittent-heating.
As a kind of optional embodiment of the present invention, the input terminal of zero cross detection circuit be connected to AC power circuit with
Between rectification circuit.
By the way that the input terminal of zero cross detection circuit to be connected between AC power circuit and rectification circuit, can reduce
Zero detection circuit fights interfering requirement.
As a kind of optional embodiment of the present invention, the input terminal of zero cross detection circuit is connected to the positive of rectification circuit
Between output end and heating circuit.
It, can by the way that the input terminal of zero cross detection circuit to be connected between the positive output end of rectification circuit and heating circuit
To improve control accuracy when controller works according to the output control electromagnetic heater that zero cross detection circuit detects.
As a kind of optional embodiment of the present invention, heating circuit includes：Resonance circuit and insulated gate bipolar crystal
Pipe IGBT, resonance circuit are connected between the positive output end of rectification circuit and the collector of IGBT, the emitter of IGBT with it is whole
The reversed-phase output of current circuit connects, and the base stage of IGBT is connect by IGBT drive circuit with controller.
As a kind of optional embodiment of the present invention, filter circuit further includes filter inductance, one end of filter inductance with
The positive output end of rectification circuit connects, and the other end of filter inductance is connect with filter capacitor and resonance circuit respectively.
By increasing filter inductance in filter circuit, the filter effect of filter circuit can be improved.
As a kind of optional embodiment of the present invention, controller is specifically used for control IGBT in the corresponding mistake of zero cross signal
Zero is open-minded.
It is open-minded in the corresponding zero crossing of zero cross signal by controlling IGBT, it can be to avoid the loss that IGBT is opened firmly and is generated
And noise.
As a kind of optional embodiment of the embodiment of the present invention, electromagnetic heater is electromagnetic oven.
Second aspect, the present invention provide a kind of Poewr control method, are applied to above-mentioned first aspect any embodiment institute
The electromagnetic heater stated, this method include：
Turning on and off for electronic switch is controlled according to current desired heating power；
When electronic switch turns off, the zero cross signal exported according to current desired heating power and zero cross detection circuit controls
Heating circuit intermittent-heating.
As a kind of optional embodiment of the present invention, according to current desired heating power control electronic switch open and
Shutdown, specifically includes：
When current desired heating power is more than predetermined power, control electronic switch is open-minded；
When current desired heating power is less than or equal to predetermined power, control electronic switch shutdown.
As a kind of optional embodiment of the present invention, exported according to current desired heating power and zero cross detection circuit
Zero cross signal controls heating circuit intermittent-heating, specifically includes：
The output power and heating duty ratio of heating circuit are determined according to current desired heating power；
Output power intermittent-heating is used according to zero cross signal and heating duty ratio control heating circuit.
As a kind of optional embodiment of the present invention, this method further includes：
When electronic switch is opened, control heating circuit uses current desired heating power laser heating.
As a kind of optional embodiment of the present invention, heating circuit includes resonance circuit and IGBT, is heated back in control
When road is heated, control IGBT is open-minded in the corresponding zero crossing of zero cross signal.
The Poewr control method that each possible embodiment of above-mentioned second aspect and above-mentioned second aspect is provided,
Advantageous effect may refer to advantageous effect caused by each possible embodiment of above-mentioned first aspect and first aspect, herein
It repeats no more.
The construction of the present invention and its other goals of the invention and advantageous effect will be in conjunction with the accompanying drawings to preferred real
Apply the description of example and more obvious and easy to understand.
Description of the drawings
Fig. 1 is the structural schematic diagram of electromagnetic heater provided in an embodiment of the present invention；
Fig. 2 is the circuit theory schematic diagram of electromagnetic heater provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of Poewr control method provided in an embodiment of the present invention.
Reference sign：
10- AC power circuits；20- rectification circuits；
30- filter circuits；40- heating circuits；
50- controllers；60- electronic switches；
70- zero cross detection circuits；80-IGBT driving circuits；
31- filter capacitors；32- filter inductances；
41- resonance circuits； 42-IGBT.
Specific implementation mode
Current electromagnetic heater is realized in the mode of low-power heating, switches the mode of resonant capacitance, in low-power
When heating, resonant frequency is very high, causes IGBT fevers very big；Power is lower, and resonant capacitance is smaller, then resonant frequency is higher,
IGBT fevers are bigger, therefore, in specific implementation, in order to ensure that the trouble free service of circuit, power minimum can only accomplish 300W；And
And IGBT overheating protections are susceptible to when line voltage is higher, reliability is low, and actual power will be significantly larger than 300W.Relay
The mode of+diode copped wave closes half period, electromagnetic heater is made to work by the unilateal conduction characteristic of diode
10ms stops 10ms, realizes that power halves；When realizing lower-wattage heating, need that electromagnetic heater is greatly lowered
Output power, such as when realization 300W, need the output power for reducing electromagnetic heater to 600W, need significantly to change in this way
Become switching frequency, make frequency of oscillation off-resonance, to which IGBT is just in hard switching state, switching loss is very big, leads to IGBT
Calorific value is very big, therefore, likewise, in order to ensure that the trouble free service of circuit, power can not also be done too small；Moreover, this side
Method stopping heating time is longer, both influences user experience, and culinary art effect is also bad.
In view of the above technical problems, a kind of electromagnetic heater of offer of the embodiment of the present invention and Poewr control method, mainly
It is that zero cross detection circuit and is increased in main circuit by an electronic switch of connecting on the filter capacitor of filter circuit, it will
The input terminal of zero cross detection circuit is connected between AC power circuit and resonance circuit, and the output end of zero cross detection circuit is connected
Connect controller；Turning on and off for electronic switch is controlled according to current desired heating power by controller, and is closed in electronic switch
When disconnected, the zero cross signal exported according to current desired heating power and zero cross detection circuit controls heating circuit intermittent-heating, comes
It realizes the calorific value for reducing IGBT when low-power heats, improves the power bracket of low-power heating.
Electromagnetic heater described in the embodiment of the present invention can be electromagnetic oven, electromagnetic heating rice cooker or electromagnetic heating pressure
Power pot etc..
Below in conjunction with the accompanying drawings, technical scheme of the present invention is described in detail.Below with reference to the reality of attached drawing description
It applies example to be exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Fig. 1 is the structural schematic diagram of electromagnetic heater provided in an embodiment of the present invention, and Fig. 2 provides for the embodiment of the present invention
Electromagnetic heater circuit theory schematic diagram.As depicted in figs. 1 and 2, electromagnetic heater provided in this embodiment includes
AC power circuit 10, rectification circuit 20, filter circuit 30, heating circuit 40 and controller 50, AC power circuit 10 connect
The two-phase input terminal of rectification circuit 20, heating circuit 40 are connected in parallel on two phase output terminals of rectification circuit 20；Filter circuit 30 includes
Filter capacitor 31, electromagnetic heater further include：Electronic switch 60 and zero cross detection circuit 70, filter capacitor 31 and electronic switch
It is connected in parallel between rectification circuit 20 and heating circuit 40 after 60 series connection, the input terminal of zero cross detection circuit 70 is connected to AC power
Between circuit 10 and resonance circuit 41；
Controller 50 is electric with the output end of heating circuit 40, the control terminal of electronic switch 60 and zero cross detection circuit 70 respectively
Connection, for controlling turning on and off for electronic switch 60 according to current desired heating power, and when electronic switch 60 turns off,
The zero cross signal exported according to current desired heating power and zero cross detection circuit 70 controls 40 intermittent-heating of heating circuit.
Specifically, AC power circuit 10 provides power supply for entire circuit, may include AC power AC, to provide electricity
Source can also include the safety devices such as fuse and varistor.Wherein, AC power has firewire and zero curve, and fuse can
To be arranged on firewire, and it is arranged in the upstream of varistor；The both ends of varistor can be connect with firewire and zero curve respectively.
Corresponding circuit structure, this implementation in existing electromagnetic heater may be used in 10 specific circuit structure of AC power circuit
Example is not specially limited this.
Rectification circuit 20 connects the firewire and zero curve of alternating current, for mains AC to be converted to Rectified alternating current.Such as Fig. 2
Shown, rectification circuit 20 can be rectifier bridge BG1.Existing electromagnetic heating may be used in the particular circuit configurations of rectification circuit 20
Rectification circuit 20 in device, the present embodiment is not specially limited this.
Heating circuit 40 includes resonance circuit 41 and power switch tube, wherein power switch tube is specifically as follows IGBT42.
Resonance circuit 41 can be by coil panel L1 in parallel and capacitance C1 realizations, the fire being connected between rectification circuit 20 and IGBT42
On line, i.e., resonance circuit 41 is connected between the positive output end of rectification circuit 20 and the collector (poles C) of IGBT42.IGBT42
Emitter (poles E) connect with the reversed-phase output of rectification circuit 20, the base stage (poles G) of IGBT42 is connect with controller 50,
When specific implementation, the G of IGBT42 can extremely be connect by IGBT drive circuit 80 with controller 50, in order to which controller 50 is right
The control of IGBT42.
The Rectified alternating current that filter circuit 30 is used to export rectification circuit 20 is filtered, as shown in Fig. 2, it can be wrapped
Filter capacitor 31 (C2) is included, can also include filter inductance 32 (L2), wherein filter capacitor 31 (C2) is connected in parallel on rectification circuit 20
Between heating circuit 40, filter inductance 32 (L2) is connected on the firewire between rectification circuit 20 and filter capacitor 31 (C2),
That is one end of filter inductance 32 (L2) is connect with the positive output end of rectification circuit 20, the other end of filter inductance 32 respectively with filter
Wave capacitance 31 (C2) and resonance circuit 41 connect.
Electronic switch 60 is connected with filter capacitor 31, can specifically be connected on positive output end and the filtering of rectification circuit 20
Between capacitance 31, it can also be connected between the reversed-phase output of rectification circuit 20 and filter capacitor 31, in the present embodiment, as
A kind of preferred embodiment, electronic switch 60 are connected between the reversed-phase output of rectification circuit 20 and filter capacitor 31, with
Improve the safety of electronic switch 60.
Wherein, electronic switch 60 can be thyristor, transistor, field-effect tube, silicon-controlled or relay etc., control terminal
It is connect with controller 50, controller 50 can control turning on and off for electronic switch 60.
The input terminal of zero cross detection circuit 70 can be connected between AC power circuit 10 and rectification circuit 20, for examining
Survey the zero crossing for the alternating current that AC power circuit 10 exports；Positive output end and the heating of rectification circuit 20 can also be connected to
Between circuit 40, the zero crossing of the Rectified alternating current for detecting the output of rectification circuit 20 exports zero cross signal to controller 50.
Wherein, the input terminal of zero cross detection circuit 70 is connected between AC power circuit 10 and rectification circuit 20, it is possible to reduce resonance
Interference when circuit 41 works to zero cross detection circuit 70, in terms of anti-interference, circuit structure requires relatively low；Zero passage detection electricity
The input terminal on road 70 is connected between the positive output end of rectification circuit 20 and heating circuit 40, and zero cross detection circuit 70 is close
IGBT42 detects the signal of 20 output end of rectification circuit, the output control that controller 50 is detected according to zero cross detection circuit 70
When IGBT42 works, control accuracy higher.As shown in the picture, it in the present embodiment, is connected with the input terminal of zero cross detection circuit 70
The exemplary illustration technical scheme of the present invention between AC power circuit 10 and rectification circuit 20.The tool of zero cross detection circuit 70
The various circuits with zero crossing detection function may be used in body circuit structure, and the present embodiment is not specially limited this.
Controller 50 is specifically as follows the control chip such as micro-control unit (Microcontroller Unit, MCU), control
Device 50 controls electronic switch 60 according to current desired heating power and turns on and off, so according to current desired heating power and
The heating power for the zero cross signal control electromagnetic heater that zero cross detection circuit 70 exports.
In specific implementation, controller 50 can be when current desired heating power be more than predetermined power, i.e., high-power
When heating, control electronic switch 60 is open-minded；When current desired heating power is less than or equal to predetermined power, i.e., add in low-power
When hot, control electronic switch 60 turns off.
Wherein, the gear output order that the power gear that controller 50 can be selected according to user generates obtains corresponding work as
Heating power needed for preceding.Predetermined power can determine that for example, 1000W is specific big according to the power bracket of electromagnetic heater
Small the present embodiment is not specially limited.
When electronic switch 60 is opened, filter capacitor 31 (C2) connect, the operating mode of electromagnetic heater with it is existing
The operating mode of electromagnetic heater circuit is consistent.Synchronous circuit, electronic switch are usually constructed in existing electromagnetic heater
60 when opening, and controller 50 does not consider the zero cross signal that zero cross detection circuit 70 exports, directly according to electromagnetic heater circuit
In synchronous circuit output synchronizing signal, control heating circuit 40 use current desired heating power laser heating.
Specifically, synchronous circuit captures the voltage at the both ends coil panel L1 when resonance circuit 41 works, voltage is transported to ratio
Compared with device both ends, commonly referred to as one end of the poles C of coil panel L1 connections IGBT42 is high-pressure side, and the other end is low-pressure end, when synchronous ratio
Comparator overturning exports synchronizing signal to controller when detecting that the high-pressure side of coil panel L1 is less than the low-pressure end of coil panel compared with device
50, the programmable pulse generator (Programme Pulse Generator, PPG) in trigger controller 50 makes PPG export
Pulse signal is open-minded by the control of IGBT drive circuit 80 IGBT42, at this point, the C pole tensions of IGBT42 are very low, IGBT42 conductings
When loss it is small.
When electronic switch 60 turns off, filter capacitor 31 (C2) shutdown, due to the voltage without filter capacitor 31 (C2)
Smoothing effect, when alternating current zero passage, it may appear that the comparator of synchronous circuit can not work, and be unable to triggered as normal PPG, to
The phenomenon that will appear zero passage failure of oscillation.In the present embodiment, when electronic switch 60 turns off, controller 50 is according to zero cross detection circuit 70
The zero cross signal control heating circuit 40 of output heats, when alternating current zero passage, the retriggered PPG by way of software,
Ensure the continuous work of circuit.
Wherein, the zero cross signal control that controller 50 is exported with specific reference to current desired heating power and zero cross detection circuit 70
40 intermittent-heating of heating circuit processed realizes low-power heating.
In specific implementation, controller 50 can determine the output work of electromagnetic heater according to current desired heating power
Then rate and heating duty ratio are added according to zero cross signal and heating duty ratio control electromagnetic heater using output power interval
Heat.When realizing intermittent-heating, between continuous two zero cross signals that controller 50 can export zero cross detection circuit 70
Time interval or the pulse width of zero cross signal are as basic heating time unit, using heating 1 or several basic heating
Time quantum stops the method for 1 or several basic heating time units to realize.
When heated, controller 50 can be using the rising edge of zero cross signal or failing edge as the beginning of output power signal
Time exports the drive signal of certain pulse width to IGBT42, IGBT42 is made to start to work, i.e., controller 50 controls IGBT42
It is open-minded in the corresponding zero crossing of zero cross signal, so that coil panel L1 and capacitance C1 in resonance circuit 41 is generated resonance, and then make electricity
Magnetic heating device output power.
Wherein, heating duty than ratio can be equal to current desired heating power and output power and subtract current desired heating
The ratio of the difference of power can also be equal to the ratio of current desired heating power and output power.In the present embodiment, it is preferred that
Heating duty than ratio be equal to the ratio that current desired heating power and output power subtract the difference of current desired heating power, with
Convenient for the calculating in the intermittent-heating period in later stage.Below also with heating duty than ratio be equal to current desired heating power with it is defeated
Go out the ratio exemplary illustration technical scheme of the present invention that power subtracts the difference of current desired heating power.
By taking domestic alternating current 50Hz as an example, the output end of rectification circuit 20 is the pulsating direct current of 100Hz, period 10ms, base
This heating time unit is 10ms.
Assuming that predetermined power is 1000W, when high-power heating, for example current desired heating power is 2000W, is more than default
Power 1000W, the control electronic switch 60 of controller 50 is open-minded, and controls the work(that heating circuit 40 uses output power as 2000W
Rate laser heating.
When low-power heats, for example current desired heating power is 1000W, is equal to predetermined power 1000W, and controller 50 is controlled
Electronic switch 60 processed turns off, and the intermittent heating is used according to zero cross signal and current desired heating power.When specific implementation, control
Device 50 processed may be used the power intervals that output power is 2000W and heat, and heats 1 basic heating time unit (10ms), stops
Only 1 basic heating time unit (10ms) uses 1:1 heating duty is than realizing, it is of course also possible to use 2:2 plus
Hot duty ratio is realized.
When for another example current desired heating power are 200W, the power intervals that output power is 2000W may be used and heat,
1 basic heating time unit is heated, 9 basic heating time units are stopped, that is, uses 1:9 heating duty is than realizing；
The power intervals that output power is 1200W may be used to heat, heat 1 basic heating time unit, stop 5 basic heating
Time quantum uses 1:5 heating duty is than realizing.Wherein, using the output power of 2000W, stop time of heating compared with
It is long；Using the output power of 1200W, when IGBT42 is opened, certain hard turning-on voltage is might have, IGBT42's opens electric current
It can be somewhat larger.
By the example above it is found that in the present embodiment, when high-power heating, the operating mode of electromagnetic heater with it is existing
Electromagnetic heater operating mode it is consistent, it is ensured that its stablize work.When low-power heats, controller 50 can be with
Electronic switch 60 is turned off, the zero cross signal exported according to current desired heating power and zero cross detection circuit 70 controls heating circuit
The output power of 40 intermittent-heatings, heating circuit 40 can be always held at high-power output state, that is, be not necessarily to significantly alter
Switching frequency moreover, IGBT42 does not have to continuous work, thus can greatly reduce hairs of the IGBT42 when low-power heats
Heat, and then power can be made small, effectively improve power bracket when low-power heating；Also, it when heated, has turned off
Filter capacitor 31 avoids the storage of electricity, and IGBT42 can be controlled under the cooperation of zero cross detection circuit 70 in zero passage
The corresponding zero crossing of signal is open-minded, and C pole tensions when such IGBT42 is opened are just very low, so as to avoid IGBT42 firmly open-minded
And the loss generated and noise；In addition, the time for stopping heating when intermittent-heating is one or several basic heating time units,
The time for stopping heating is Millisecond, and user hardly feels, thus can effectively promote user experience, and can also
It is effective to promote culinary art effect.
Electromagnetic heater provided in this embodiment, by increasing electronic switch and zero cross detection circuit in major loop,
It is connected in parallel between rectification circuit and heating circuit after electronic switch is connected with filter capacitor, by the input terminal of zero cross detection circuit
It is connected between AC power circuit and resonance circuit；By controlling opening and closing for electronic switch according to current desired heating power
It is disconnected, and when electronic switch turns off, the zero cross signal control exported according to current desired heating power and zero cross detection circuit adds
Hot loop intermittent-heating can effectively reduce fevers of the IGBT when low-power heats, and improve the power model of low-power heating
It encloses.
Fig. 3 is the flow diagram of Poewr control method provided in an embodiment of the present invention, and method provided in this embodiment is answered
For the electromagnetic heater described in above-described embodiment, as shown in figure 3, method provided in this embodiment may include walking as follows
Suddenly：
S101, turning on and off for electronic switch is controlled according to current desired heating power.
Specifically, after user has selected power gear, controller can receive gear output order；It is stored in controller
It can be according to gear after thering is the correspondence between gear output order and heating power, controller to receive gear output order
Output order and above-mentioned correspondence obtain current desired heating power.
After controller gets current desired heating power, can current desired heating power be more than predetermined power when,
I.e. in high-power heating, control electronic switch is open-minded；When current desired heating power is less than or equal to predetermined power, that is, exist
When low-power heats, control electronic switch shutdown.
S102, when electronic switch turns off, believed according to the zero passage that current desired heating power and zero cross detection circuit export
Number control heating circuit intermittent-heating.
Specifically, when electronic switch turns off, controller can determine the defeated of heating circuit according to current desired heating power
Go out power and heating duty ratio, is then added using output power interval according to zero cross signal and heating duty ratio control heating circuit
Heat realizes low-power heating.
In specific implementation, can be stored in controller between preset current desired heating power and output power
Correspondence, such as：The current desired heating power of 1000W corresponds to the current desired heating work(of the output power of 2000W, 600W
Rate corresponds to the output power of 1200W, the current desired heating power of 100W corresponds to the output power etc. of 1200W.Controller according to
The correspondence determines the output power of heating circuit.
When determining heating duty ratio, heating duty than ratio can be equal to current desired heating power and output power
Subtract the ratio of the difference of current desired heating power, the ratio of current desired heating power and output power can also be equal to.To work as
Heating power needed for preceding is 200W, for output power is 2000W, heating duty than ratio can be equal to 200W and 2000W-
The ratio of 200W is equal to 1/9, specific heating duty ratio can be 1:9 or 2:18 equal ratios are equal to 1/9 duty ratio；
It can be the ratio of 200W and 2000W, that is, be equal to 1/10, specific heating duty ratio can be 1:10 or 2:20 equal ratios are equal to
1/10 duty ratio.
In the present embodiment, it is preferred that heating duty than ratio subtract with output power equal to current desired heating power and work as
The ratio of the difference of heating power needed for preceding.Below also with heating duty than ratio be equal to current desired heating power and output work
Rate subtracts the ratio exemplary illustration technical scheme of the present invention of the difference of current desired heating power.
Time interval between continuous two zero cross signals of zero cross detection circuit output can be determined as base by controller
This heating time unit.After determining heating duty ratio, controller can determine intermittent-heating week according to heating duty ratio
When the quantity X of corresponding basic heating time unit of interim laser heating time is with heating time corresponding basic heating is stopped
Between unit quantity Y；Then control heating circuit is basic using output power laser heating X in each intermittent-heating period
Stop the basic heating time unit of heating Y after heating time unit.
Continue so that current desired heating power is 200W, output power is 2000W as an example, heating duty ratio is 1:9, then between
The quantity X of laser heating time corresponding basic heating time unit in heating cycle of having a rest is 1, stopping heating time is corresponding
The quantity Y of basic heating time unit is 9.Controller is heated with intermittent-heating loop cycle, in each intermittent-heating period
Using stopping after the basic heating time unit of output power laser heating 1 of 1200W, heating 9 is basic to be added control heating circuit
Hot time quantum.
In specific implementation, as in each intermittent-heating period, zero cross signal is detected, when detecting zero cross signal
When, control heating circuit uses output power laser heating, and the quantity of the accumulative zero cross signal detected, namely basic heating
The quantity of time quantum；When the quantity of zero cross signal is X, i.e. when the basic heating time unit of laser heating X, stop heating,
And by the zeroing number of zero cross signal, add up the quantity of the zero cross signal detected again；When again accumulative zero cross signal
Quantity is Y, that is, when stopping Y basic heating time units of heating, by the zeroing number of zero cross signal, into next interval
Heating cycle.
When controlling heating circuit heating, the pulse for specifically exporting duty ratio corresponding to IGBT according to output power is believed
Number, driving IGBT work makes resonant current oscillations, so that electromagnetic heater is exported above-mentioned output power, wherein controller
It is open-minded in the corresponding zero crossing of zero cross signal that IGBT can be controlled.
S103, when electronic switch is opened, control heating circuit use current desired heating power laser heating.
Specifically, when electronic switch is opened, controller controls heating circuit and uses current desired heating power laser heating,
Realize high-power heating, specific control method is similar with existing electromagnetic heater laser heating control method, herein not
It repeats again.
Poewr control method provided in this embodiment is applied to above structure embodiment, specific operation principle and skill
Art effect is similar, and details are not described herein again.
In the present invention unless specifically defined or limited otherwise, term " connection ", " connected ", " fixation ", " installation " etc.
It shall be understood in a broad sense, such as can be mechanical connection, can also be electrical connection；Can be directly connected to, centre can also be passed through
Medium is indirectly connected, and can be the interaction relationship of the connection or two elements inside two elements, unless otherwise specific
It limits, for the ordinary skill in the art, can understand the tool of above-mentioned term in the present invention as the case may be
Body meaning.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (13)
1. a kind of electromagnetic heater, including AC power circuit (10), rectification circuit (20), filter circuit (30), heat back
Road (40) and controller (50), the AC power circuit (10) connects the two-phase input terminal of the rectification circuit (20), described
Heating circuit (40) is connected in parallel on two phase output terminals of the rectification circuit (20)；The filter circuit (30) includes filter capacitor
(31), which is characterized in that the electromagnetic heater further includes：Electronic switch (60) and zero cross detection circuit (70), the filter
Wave capacitance (31) be connected in parallel on after connecting with the electronic switch (60) rectification circuit (20) and the heating circuit (40) it
Between, the input terminal of the zero cross detection circuit (70) be connected to the AC power circuit (10) and the heating circuit (40) it
Between；
The controller (50) is examined with the heating circuit (40), the control terminal of the electronic switch (60) and the zero passage respectively
The output end of slowdown monitoring circuit (70) is electrically connected, for according to current desired heating power control the electronic switch (60) open and
Shutdown, and when the electronic switch (60) turn off, according to the current desired heating power and the zero cross detection circuit
(70) zero cross signal exported controls heating circuit (40) intermittent-heating.
2. electromagnetic heater according to claim 1, which is characterized in that the controller (50) is specifically used for：Working as
When heating power needed for preceding is more than predetermined power, it is open-minded to control the electronic switch (60), and controls the heating circuit (40)
Using the current desired heating power laser heating；When current desired heating power is less than or equal to the predetermined power,
The electronic switch (60) shutdown is controlled, and determines the output of the electromagnetic heater according to the current desired heating power
Then power and heating duty ratio control the heating circuit (40) according to the zero cross signal and heating duty ratio and use
The output power intermittent-heating.
3. electromagnetic heater according to claim 1, which is characterized in that the input terminal of the zero cross detection circuit (70)
It is connected between the AC power circuit (10) and rectification circuit (20).
4. electromagnetic heater according to claim 1, which is characterized in that the input terminal of the zero cross detection circuit (70)
It is connected between the positive output end of the rectification circuit (20) and the heating circuit (40).
5. electromagnetic heater according to claim 1, which is characterized in that the heating circuit (40) includes：Resonance electricity
Road (41) and insulated gate bipolar transistor IGBT (42), the resonance circuit (41) are being connected on the rectification circuit (20) just
Between phase output terminal and the collector of the IGBT (42), the emitter of the IGBT (42) is anti-with the rectification circuit (20)
Phase output terminal connects, and the base stage of the IGBT (42) is connect by IGBT drive circuit (80) with the controller (50).
6. electromagnetic heater according to claim 5, which is characterized in that the filter circuit (30) further includes filtered electrical
Feel (32), one end of the filter inductance (32) is connect with the positive output end of the rectification circuit (20), the filter inductance
(32) the other end is connect with the filter capacitor (31) and the resonance circuit (41) respectively.
7. electromagnetic heater according to claim 5, which is characterized in that the controller (50) is specifically used for control institute
It is open-minded in the corresponding zero crossing of the zero cross signal to state IGBT (42).
8. according to claim 1-7 any one of them electromagnetic heaters, which is characterized in that the electromagnetic heater is electricity
Magnetic stove.
9. a kind of Poewr control method is applied to claim 1-8 any one of them electromagnetic heaters, which is characterized in that
The method includes：
Turning on and off for electronic switch is controlled according to current desired heating power；
When the electronic switch turns off, according to the zero cross signal of the current desired heating power and zero cross detection circuit output
Control heating circuit intermittent-heating.
10. according to the method described in claim 9, it is characterized in that, described control electronic cutting according to current desired heating power
What is closed turns on and off, and specifically includes：
When current desired heating power is more than predetermined power, it is open-minded to control the electronic switch；
When current desired heating power is less than or equal to the predetermined power, the electronic switch shutdown is controlled.
11. according to the method described in claim 9, it is characterized in that, described according to the current desired heating power and zero passage
The zero cross signal of detection circuit output controls heating circuit intermittent-heating, specifically includes：
The output power and heating duty ratio of the heating circuit are determined according to the current desired heating power；
The heating circuit, which is controlled, according to the zero cross signal and heating duty ratio uses the output power intermittent-heating.
12. according to the method described in claim 9, it is characterized in that, the method further includes：
When the electronic switch is opened, controls the heating circuit and use the current desired heating power laser heating.
13. according to claim 9-12 any one of them methods, which is characterized in that the heating circuit include resonance circuit and
It is open-minded in the corresponding zero crossing of the zero cross signal to control the IGBT when controlling the heating circuit heating by IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136093.9A CN108513382A (en) | 2018-02-09 | 2018-02-09 | Electromagnetic heating device and power control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136093.9A CN108513382A (en) | 2018-02-09 | 2018-02-09 | Electromagnetic heating device and power control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108513382A true CN108513382A (en) | 2018-09-07 |
Family
ID=63374943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810136093.9A Pending CN108513382A (en) | 2018-02-09 | 2018-02-09 | Electromagnetic heating device and power control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108513382A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110278622A (en) * | 2019-07-26 | 2019-09-24 | 佛山市顺德区芯科电子有限公司 | A kind of control circuit that electromagnetic heating low-power continuously exports |
| CN113825268A (en) * | 2021-08-02 | 2021-12-21 | 惠州拓邦电气技术有限公司 | Low-power continuously adjustable heating control circuit, method and heating device |
| CN113885615A (en) * | 2020-07-03 | 2022-01-04 | 九阳股份有限公司 | Control method for intermittent heating and cooking appliance |
| WO2022229695A1 (en) * | 2021-04-30 | 2022-11-03 | Zhejiang Supor Electrical Appliances Manufacturing Co., Ltd. | A heating control method and device and an electromagnetic heating cooking utensil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005222728A (en) * | 2004-02-03 | 2005-08-18 | Toshiba Home Technology Corp | Control unit |
| US20060076338A1 (en) * | 2003-07-02 | 2006-04-13 | Valery Kagan | Method and apparatus for providing harmonic inductive power |
| CN201263225Y (en) * | 2008-08-01 | 2009-06-24 | 浙江苏泊尔家电制造有限公司 | Low power continuous heating control circuit for electromagnetic stove |
| CN203645851U (en) * | 2013-12-05 | 2014-06-11 | 东莞市前锋电子有限公司 | Continuous heating control circuit of induction cooker |
| CN204538995U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The electromagnetic heater of cooking apparatus and cooking apparatus |
-
2018
- 2018-02-09 CN CN201810136093.9A patent/CN108513382A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060076338A1 (en) * | 2003-07-02 | 2006-04-13 | Valery Kagan | Method and apparatus for providing harmonic inductive power |
| JP2005222728A (en) * | 2004-02-03 | 2005-08-18 | Toshiba Home Technology Corp | Control unit |
| CN201263225Y (en) * | 2008-08-01 | 2009-06-24 | 浙江苏泊尔家电制造有限公司 | Low power continuous heating control circuit for electromagnetic stove |
| CN203645851U (en) * | 2013-12-05 | 2014-06-11 | 东莞市前锋电子有限公司 | Continuous heating control circuit of induction cooker |
| CN204538995U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The electromagnetic heater of cooking apparatus and cooking apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110278622A (en) * | 2019-07-26 | 2019-09-24 | 佛山市顺德区芯科电子有限公司 | A kind of control circuit that electromagnetic heating low-power continuously exports |
| CN110278622B (en) * | 2019-07-26 | 2024-04-12 | 广东韦奇伍德环保科技有限公司 | Control circuit for electromagnetic heating low-power continuous output |
| CN113885615A (en) * | 2020-07-03 | 2022-01-04 | 九阳股份有限公司 | Control method for intermittent heating and cooking appliance |
| WO2022229695A1 (en) * | 2021-04-30 | 2022-11-03 | Zhejiang Supor Electrical Appliances Manufacturing Co., Ltd. | A heating control method and device and an electromagnetic heating cooking utensil |
| CN113825268A (en) * | 2021-08-02 | 2021-12-21 | 惠州拓邦电气技术有限公司 | Low-power continuously adjustable heating control circuit, method and heating device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108513382A (en) | Electromagnetic heating device and power control method | |
| CN101309529B (en) | Intelligent control apparatus and method for high-power energy saving electromagnetic stove | |
| CN106813269B (en) | Electromagnetic heating equipment | |
| TWI501534B (en) | System and method for controlling quasi-resonant inverter and electric heating device employing the same | |
| CN106813271B (en) | A kind of low-power laser heating electromagnetic oven | |
| CN201119038Y (en) | Control device of electromagnetic oven | |
| CN102984837B (en) | Energy-saving multifrequency electromagnetic induction heating device | |
| CN201238406Y (en) | Intelligent control apparatus of high-power energy-saving electromagnetic range | |
| EP3312511B1 (en) | Electromagnetic heating device | |
| CN103405161A (en) | Electric cooking appliance and heating control method thereof | |
| CN108513381A (en) | Electromagnetic heating device and power control method | |
| CN102252355A (en) | Control method for continuous low-power heating of induction cooker | |
| CN208094825U (en) | heating circuit and induction cooker | |
| CN2792079Y (en) | Electromagnetic stove capable of continuously heating at low poer | |
| CN106813276B (en) | Electromagnetic oven | |
| CN106016386B (en) | A kind of electromagnetic oven that power is continuously adjustable | |
| CN109511189A (en) | Heating circuit, induction cooker and driving voltage adjusting method | |
| CN209120505U (en) | heating circuit and induction cooker | |
| CN209517544U (en) | Electromagnetic heating circuit and electromagnetic oven | |
| CN110505724A (en) | A kind of heating utensil protection circuit, guard method and heating utensil | |
| CN206162237U (en) | Many check electricity rice cooker and electromagnetism electrical pressure cooker's electric power control device | |
| CN208272851U (en) | Electromagnetic compatibility filter circuit, DC power supply and electric heating utensil | |
| CN202281962U (en) | Heating power control circuit | |
| CN214069551U (en) | Electric heating equipment for kitchen and control device thereof | |
| CN208572476U (en) | Electromagnetic heating circuit and electromagnetic heating appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180907 |