CN106211392B - Electromagnetic heating system and its switching tube open control device and method - Google Patents
Electromagnetic heating system and its switching tube open control device and method Download PDFInfo
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- CN106211392B CN106211392B CN201510217237.XA CN201510217237A CN106211392B CN 106211392 B CN106211392 B CN 106211392B CN 201510217237 A CN201510217237 A CN 201510217237A CN 106211392 B CN106211392 B CN 106211392B
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Abstract
Control device and method are opened the invention discloses a kind of electromagnetic heating system and its switching tube, the electromagnetic heating system includes the driving circuit of the resonance circuit being made of heating coil, resonant capacitance and switching tube and the driving switching tube, the control device of opening includes: current detection circuit, the current detection circuit is connected with the emitter of the switching tube, and the current detection circuit is for detecting the immediate current for flowing through the switching tube；Main control unit, the main control unit is respectively connected with the driving circuit and the current detection circuit, the main control unit is used to adjust the heating power of the electromagnetic heating system according to the immediate current for flowing through the switching tube, so that the switching tube meets and preset opens requirement, to, can by switching tube adjustment to it is default open it is open-minded under requirement, better adapt to different cookwares, it meets the needs of users, and can be avoided switching tube and generate heat and even damage because advanced or lag is opened.
Description
Technical field
The present invention relates to living electric apparatus technical field, in particular to switching tube opens control in a kind of electromagnetic heating system
Switching tube opens control method in device, a kind of electromagnetic heating system and a kind of electromagnetic heating system.
Background technique
Optimal state is Uce ' (voltage between the collector and emitter of IGBT pipe) to IGBT pipe when opening is zero
And reversed freewheel current is also zero, but due to the limitation of physical condition, Uce ' can not oscillate to zero in many cases, add
Thermal power is smaller, and Uce ' is more difficult to oscillate to zero, and it is advanced open-minded for opening IGBT at this time；Reversed freewheel current is in many cases
It is difficult to zero, heating power is bigger, and reversed freewheel current may be bigger, opens at this time open-minded to lag.
In the related art, the minimum value and maximum value that heating power is generally determined by testing, so that Uce ' is less than
Predeterminated voltage, reversed freewheel current are less than predetermined current.But its disadvantages are that Uce ' and reversed freewheel current only exist
It is just adjustable in preset range using when known cookware, and for unknown some cookwares, it not can guarantee Uce ' and reversely continue
Galvanic electricity stream all within a preset range, may cause IGBT pipe overheat, or even the problem of be damaged in this way.Therefore, the relevant technologies
There are improved needs.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
What one purpose was to propose switching tube in a kind of electromagnetic heating system opens control device, which can be by switching tube intelligence
Be adjusted to it is default open it is open-minded under requirement.
It is another object of the present invention to propose a kind of electromagnetic heating system.Yet another object of the invention is that proposing
Switching tube opens control method in a kind of electromagnetic heating system.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of the open-minded of switching tube in electromagnetic heating system
Control device, the electromagnetic heating system include the resonance circuit being made of heating coil, resonant capacitance and switching tube and drive
The driving circuit of the switching tube is moved, the control device of opening includes: current detection circuit, the current detection circuit and institute
The emitter for stating switching tube is connected, and the current detection circuit is for detecting the immediate current for flowing through the switching tube；Master control list
Member, the main control unit are respectively connected with the driving circuit and the current detection circuit, and the main control unit is used for basis
The immediate current for flowing through the switching tube adjusts the heating power of the electromagnetic heating system, presets so that the switching tube meets
Open requirement.
Switching tube opens control device in the electromagnetic heating system proposed according to embodiments of the present invention, passes through current detecting
Circuit detects the immediate current for flowing through switching tube, and main control unit adjusts electromagnetic heating system according to the immediate current for flowing through switching tube
Heating power so that switching tube meet it is preset open requirement, thus, it is possible to which switching tube adjustment is wanted to default open
It asks lower open-minded, better adapts to different cookwares, meet the needs of users, and can be avoided switching tube because advanced or lag is opened
Lead to and generates heat and even damage.
According to an embodiment of the present invention, when the immediate current for flowing through the switching tube is greater than the first current threshold, institute
It states main control unit and judges that the switching tube is open-minded in advance, and increase the heating power of the electromagnetic heating system, wherein described
One current threshold is greater than zero；When flowing through the immediate current of the switching tube less than the second current threshold, the main control unit is sentenced
The switching tube lag of breaking is open-minded, and reduces the heating power of the electromagnetic heating system, wherein second current threshold is small
In zero.
A specific embodiment according to the present invention, the switching tube be IGBT pipe, the pole C of the IGBT pipe with it is in parallel
The heating coil is connected with resonant capacitance, and the pole E of the IGBT pipe is grounded by the current detection circuit, the IGBT pipe
The pole G be connected with the driving circuit.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of electromagnetic heating system, including described
Switching tube opens control device.
Switching tube adjustment can be opened requirement to default by the electromagnetic heating system proposed according to embodiments of the present invention
Under it is open-minded, better adapt to different cookwares, meet the needs of users.
A specific embodiment according to the present invention, the electromagnetic heating system include electromagnetic oven, electromagnetic rice cooker, electromagnetism
Pressure cooker.
In order to achieve the above objectives, another aspect of the invention embodiment proposes a kind of opening for switching tube in electromagnetic heating system
Logical control method, the electromagnetic heating system include the resonance circuit being made of heating coil, resonant capacitance and switching tube and
Drive the driving circuit of the switching tube, the wink for opening control method the following steps are included: the switching tube is flowed through in detection
Between electric current；The heating power of the electromagnetic heating system is adjusted according to the immediate current for flowing through the switching tube, so that described open
It closes pipe and meets and preset open requirement.
Switching tube opens control method in the electromagnetic heating system proposed according to embodiments of the present invention, flows through out in detection
After the immediate current for closing pipe, the heating power of electromagnetic heating system is adjusted according to the immediate current for flowing through switching tube, so as to open
Close pipe meet it is preset open requirements, thus, it is possible to by switching tube adjustment to it is default open require under it is open-minded, preferably fit
Different cookwares is answered, is met the needs of users, and can be avoided switching tube and generate heat and even damage because advanced or lag is opened.
According to one embodiment of present invention, when the immediate current for flowing through the switching tube is greater than the first current threshold,
Judge that the switching tube is open-minded in advance, and increase the heating power of the electromagnetic heating system, wherein first current threshold
Greater than zero；When flowing through the immediate current of the switching tube less than the second current threshold, judge that the switching tube lag is open-minded, and
Reduce the heating power of the electromagnetic heating system, wherein second current threshold is less than zero.
Detailed description of the invention
Fig. 1 is the schematic diagram for opening control device of switching tube in electromagnetic heating system according to an embodiment of the present invention；
Fig. 2 is the waveform diagram of voltage and current when switching tube occurs to open in advance；
Fig. 3 is the waveform diagram that voltage and current when lag is opened occurs for switching tube；
Fig. 4 is that switching tube opens showing for control device in electromagnetic heating system accord to a specific embodiment of that present invention
It is intended to；And
Fig. 5 is the flow chart for opening control method of switching tube in electromagnetic heating system according to an embodiment of the present invention.
Appended drawing reference:
Heating coil L2, resonant capacitance C2, switching tube Q1, resonance circuit 20, driving circuit 30, open control device 10,
Current detection circuit 101, main control unit 102, filter inductance L1, filter capacitor C1 and rectifier 40.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the control of opening of switching tube fills in the electromagnetic heating system to describe proposition of the embodiment of the present invention
Set, switching tube opens control method in electromagnetic heating system and electromagnetic heating system, wherein electromagnetic heating system for pair
Cookware is heated.
Fig. 1 is the schematic diagram for opening control device of switching tube in electromagnetic heating system according to an embodiment of the present invention.Such as
Shown in Fig. 1, electromagnetic heating system include by heating coil L2, resonant capacitance C2 and switching tube the Q1 resonance circuit 20 formed and
The driving circuit 30 of driving switch pipe Q1.Wherein, resonance circuit 20 is used to carry out resonance heating to cookware specifically to work as switch
When pipe Q1 is connected under the driving of driving circuit 30, heating coil L2 is charged, to maintain heating coil L2 and resonant capacitance
Oscillation between C2 is prepared, when being turned off under driving of the switching tube Q1 in driving circuit 30, heating coil L2 and resonant capacitance
C2 is vibrated.Thus alternating magnetic field is generated around heating coil L2, the magnetic line of force of alternating magnetic field largely passes through cookware, and
A large amount of vortex are generated in the bottom of a pan of cookware, to generate heat needed for culinary art.
In embodiments of the present invention, as shown in Figure 1, opening control device 10 includes: current detection circuit 101 and master control list
Member 102.Current detection circuit 101 is connected with the emitter of switching tube Q1, and current detection circuit 101 flows through switching tube for detecting
The immediate current of Q1.Flow through the electric current of switching tube Q1 that is, detecting by current detection circuit 101, with to determine whether
Occur to open or lag in advance open-minded.It should be noted that as shown in Figure 1, being flowed through out when switching tube Q1 is in the conductive state
Close pipe Q1 immediate current can refer to the electric current that emitter is flowed to from collector, and flow through switching tube Q1 body diode it is anti-
To freewheel current.
Main control unit 102 is respectively connected with driving circuit 30 and current detection circuit 101, and main control unit 102 is used for basis
The heating power for flowing through the immediate current adjustment electromagnetic heating system of switching tube, so that switching tube Q1 meets preset open and wants
It asks.That is, main control unit 102 can export pwm control signal to driving circuit 30, so that 30 driving switch pipe of driving circuit
Q1 on or off, main control unit 102 can also obtain the immediate current for flowing through switching tube that current detection circuit 101 detects.
It should be noted that the preset voltage opened between the collector and emitter for requiring to specifically refer to switching tube Q1
Uce is less than predeterminated voltage and reversed freewheel current is less than predetermined current.
It should be noted that the factors such as cookware and heating power will affect the open-minded of switching tube Q1.If heating power
Lower, switching tube Q1 may occur advanced open-minded；If heating power is higher, switching tube Q1 may lag it is open-minded,
Can by adjusting heating power so that switching tube Q1 meet it is preset open requirement, and then it is different to adapt to electromagnetic heating system
Cookware.
During electromagnetic heating system is heated, flow through switching tube Q1's when can open by detection switch pipe Q1
Electric current, since to judge whether switching tube Q1 occurs to open or lag in advance open-minded.When switching tube Q1 is opened, main control unit 102
The immediate current of switching tube can be obtained, and it is preset open-minded according to the immediate current of switching tube to can determine whether switching tube Q1 meets
It is required that.If it is satisfied, then maintaining current heating power；If conditions are not met, i.e. switching tube Q1 is advanced or lag is open-minded, then adjust
Heating power.
Switching tube opens control device 10 in the electromagnetic heating system that the embodiment of the present invention proposes as a result, passes through electric current
Detection circuit 101 detects the immediate current for flowing through switching tube Q1, and main control unit 102 is according to the immediate current tune for flowing through switching tube Q1
The heating power of whole electromagnetic heating system so that switching tube Q1 meet it is preset open requirement, thus, it is possible to by switching tube intelligence
It is adjusted to default and opens open-minded under requirement, better adapt to different cookwares, meet the needs of users, and can be avoided switch
Pipe generates heat and even damages because advanced or lag is opened.
A specific example according to the present invention, main control unit 102 can be by adjusting the duties of the pwm control signal of output
Than come achieve the purpose that adjust heating power.
Further, according to one embodiment of present invention, when the immediate current for flowing through switching tube Q1 is greater than the first electric current
When threshold value, main control unit 102 judges that switching tube Q1 is open-minded in advance, and increases the heating power of electromagnetic heating system, wherein first
Current threshold is greater than zero；When flowing through the immediate current of switching tube Q1 less than the second current threshold, the judgement switch of main control unit 102
Pipe Q1 lag is open-minded, and reduces the heating power of electromagnetic heating system, wherein the second current threshold is less than zero.
It should be noted that when switching tube Q1 occurs to open in advance, between the collector and emitter of switching tube Q1
The waveform of the voltage Uce and electric current Ice for flowing through switching tube Q1 is as shown in Fig. 2, flow through the electric current Ice of switching tube Q1 in one opened
Moment can generate biggish short circuit current i1, can detect short circuit current i1 in this way, if short circuit current i1 is more than the first electric current
It is advanced open-minded then to judge that switching tube Q1 occurs for threshold value；When lag, which occurs, for switching tube Q1 opens, the collector and hair of switching tube Q1
The waveform of the voltage Uce and electric current Ice for flowing through switching tube Q1 between emitter-base bandgap grading is as shown in figure 3, flow through the electric current Ice of switching tube Q1
Larger reversed freewheel current-i2 can be generated in a flash what is opened, can detect the reverse current-i2 in this way, if reversed afterflow
It is open-minded then to judge that lag occurs for switching tube Q1 more than the second current threshold by electric current-i2.
As described above, detecting the immediate current for flowing through switching tube Q1 by current detection circuit 101.It is open-minded in switching tube Q1
When, i.e., when the pwm control signal that main control unit 102 exports becomes high level from low level, if flowing through the wink of switching tube Q1
Between electric current be greater than the first current threshold I1, then main control unit 102 increase electromagnetic heating system heating power, to reduce collector
Voltage Uce between emitter makes voltage Uce deteriorate to less than predeterminated voltage, meets to preset and opens requirement, thus more preferably suitable
Answer cookware.If flowing through the immediate current of switching tube Q1 less than the second current threshold I2, main control unit 102 reduces electromagnetic heating
The heating power of system makes reversed freewheel current deteriorate to less than predetermined current to reduce reversed freewheel current, meets default open
It is logical to require, to better conform to cookware.
The embodiment of the present invention opens control device and can open switching tube adjustment under requirement to default open as a result,
It is logical, different cookwares is better adapted to, is met the needs of users, and can be avoided switching tube and sent out due to advanced or lag is opened
Heat is even damaged.
A specific embodiment according to the present invention is opened as shown in figure 4, heating coil L2 can be in parallel with resonant capacitance C2
Closing pipe Q1 can manage for IGBT, and the pole C of IGBT pipe is connected with heating coil L2 in parallel and resonant capacitance C2, and the E of IGBT pipe is extremely logical
Overcurrent sensing circuit 101 is grounded, and the pole G of IGBT pipe is connected with driving circuit 30.
Further, such as the example of Fig. 4, electromagnetic heating system may also include filter inductance L1, filter capacitor C1 and rectification
Device 40.
Specifically, one end of filter inductance L1 is connected with the heating coil L2 after parallel connection with one end of resonant capacitance C2,
In, the heating coil L2 after parallel connection is extremely connected with the other end of resonant capacitance C2 with the C of IGBT pipe；One end of filter capacitor C1 with
One end of filter inductance L1 is connected, the other end ground connection of filter capacitor C1；The first input end and AC power source AC of rectifier 40
Firewire L be connected, the second input terminal of rectifier 40 is connected with the zero curve N of AC power source AC, the first output end of rectifier 40
It is connected with the other end of filter inductance L1, the second output terminal ground connection of rectifier 40.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heating system, the switching tube including above-described embodiment is opened
Logical control device.
Switching tube adjustment can be opened requirement to default by the electromagnetic heating system proposed according to embodiments of the present invention
Under it is open-minded, better adapt to different cookwares, meet the needs of users.
A specific embodiment according to the present invention, electromagnetic heating system may include electromagnetic oven, electromagnetic rice cooker, electromagnetism pressure
Power pot etc..
Based on the above embodiment, the invention also provides in a kind of electromagnetic heating system switching tube open control method.
Fig. 5 is the flow chart for opening control method of switching tube in electromagnetic heating system according to an embodiment of the present invention.Electricity
Magnetic heating system includes the driving electricity for the resonance circuit and driving switch pipe being made of heating coil, resonant capacitance and switching tube
Road.As shown in figure 5, open control method the following steps are included:
S1: the immediate current of switching tube is flowed through in detection.
Wherein, the moment electricity of switching tube is flowed through in the current detection circuit detection that can be connected by the emitter with switching tube
Stream.
It should be noted that the immediate current for flowing through switching tube can refer to the electric current for flowing to emitter from collector, Yi Jiliu
Cross the reversed freewheel current of the body diode of switching tube.
S2: adjusting the heating power of electromagnetic heating system according to the immediate current for flowing through switching tube, so that switching tube meets
It is preset to open requirement.
It should be noted that preset open requires to specifically refer to the voltage between the collector of switching tube and emitter
Uce is less than predeterminated voltage and reversed freewheel current is less than predetermined current.
It should be noted that the factors such as cookware and heating power will affect the open-minded of switching tube Q1.If heating power
Lower, switching tube Q1 may occur advanced open-minded；If heating power is higher, switching tube Q1 may lag it is open-minded,
Can by adjusting heating power so that switching tube Q1 meet it is preset open requirement, and then it is different to adapt to electromagnetic heating system
Cookware.
During electromagnetic heating system is heated, when switching tube Q1 is opened, the moment electricity of switching tube can be obtained
Stream, and can determine whether switching tube meets according to the immediate current of switching tube and preset open requirement.If it is satisfied, then maintaining to work as
Preceding heating power；If conditions are not met, i.e. switching tube is advanced or lag is open-minded, then heating power is adjusted.
Switching tube opens control method in the electromagnetic heating system that the embodiment of the present invention proposes as a result, flows through in detection
After the immediate current of switching tube, the heating power of electromagnetic heating system is adjusted according to the immediate current for flowing through switching tube, so that
Switching tube meet it is preset open requirement, thus, it is possible to by switching tube adjustment to it is default open it is open-minded under requirement, preferably
Different cookwares is adapted to, is met the needs of users, and can be avoided switching tube and generate heat and even damage because advanced or lag is opened
It is bad.
According to one embodiment of present invention, when the immediate current for flowing through switching tube is greater than the first current threshold, judgement
Switching tube is open-minded in advance, and increases the heating power of electromagnetic heating system, wherein the first current threshold is greater than zero；When flowing through out
When closing the immediate current of pipe less than the second current threshold, judge that switching tube lag is open-minded, and reduce the heating of electromagnetic heating system
Power, wherein the second current threshold is less than zero.
That is, the immediate current of switching tube is flowed through in detection.If the immediate current for flowing through switching tube is greater than the first electricity
Threshold value I1 is flowed, then increases the heating power of electromagnetic heating system, to reduce the voltage Uce between collector and emitter, makes electricity
Pressure Uce deteriorates to less than predeterminated voltage, meets to preset and opens requirement, to better conform to cookware.When switching tube Q1 is opened, such as
Fruit flows through the immediate current of switching tube less than the second current threshold I2, then reduces the heating power of electromagnetic heating system, to reduce
Reversed freewheel current makes reversed freewheel current deteriorate to less than predetermined current, meets to preset and opens requirement, to better conform to pot
Tool.
The embodiment of the present invention opens control device and can open switching tube adjustment under requirement to default open as a result,
It is logical, different cookwares is better adapted to, is met the needs of users, and can be avoided switching tube and sent out due to advanced or lag is opened
Heat is even damaged.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (7)
1. switching tube opens control device in a kind of electromagnetic heating system, which is characterized in that the electromagnetic heating system includes
The driving circuit of the resonance circuit and the drivings switching tube that be made of heating coil, resonant capacitance and switching tube, it is described to open
Logical control device includes:
Current detection circuit, the current detection circuit are connected with the emitter of the switching tube, and the current detection circuit is used
The immediate current of the switching tube is flowed through in detection；
Main control unit, the main control unit are respectively connected with the driving circuit and the current detection circuit, the master control list
Member is for adjusting the heating power of the electromagnetic heating system according to the immediate current for flowing through the switching tube, so that the switch
Pipe, which meets, preset opens requirement, wherein the main control unit increases the electromagnetism when judging that the switching tube is opened in advance
The heating power of heating system, and when judging that the switching tube lag is opened, reduce the heating of the electromagnetic heating system
Power.
2. switching tube opens control device in electromagnetic heating system as described in claim 1, which is characterized in that
When the immediate current for flowing through the switching tube is greater than the first current threshold, the main control unit judges that the switching tube is super
It is preceding open-minded, wherein first current threshold is greater than zero；And
When flowing through the immediate current of the switching tube less than the second current threshold, the main control unit judges that the switching tube is stagnant
It is open-minded afterwards, wherein second current threshold is less than zero.
3. switching tube opens control device in electromagnetic heating system as described in claim 1, which is characterized in that the switch
Pipe is that IGBT is managed, and the pole C of the IGBT pipe is connected with the heating coil in parallel and resonant capacitance, the pole E of the IGBT pipe
It is grounded by the current detection circuit, the pole G of the IGBT pipe is connected with the driving circuit.
4. a kind of electromagnetic heating system, which is characterized in that including the open-minded of switching tube as claimed in any one of claims 1-3
Control device.
5. electromagnetic heating system as claimed in claim 4, which is characterized in that the electromagnetic heating system includes electromagnetic oven, electricity
Magnetoelectricity rice cooker, prevention electromagnetic pressure cooker.
6. switching tube opens control method in a kind of electromagnetic heating system, which is characterized in that the electromagnetic heating system includes
The driving circuit of the resonance circuit and the drivings switching tube that be made of heating coil, resonant capacitance and switching tube, it is described to open
Logical control method the following steps are included:
The immediate current of the switching tube is flowed through in detection；
The heating power of the electromagnetic heating system is adjusted according to the immediate current for flowing through the switching tube, so that the switching tube
Meet and preset open requirement, wherein when judging that the switching tube is opened in advance, increases the heating of the electromagnetic heating system
Power, and when judging that the switching tube lag is opened, reduce the heating power of the electromagnetic heating system.
7. switching tube opens control method in electromagnetic heating system as claimed in claim 6, which is characterized in that
When the immediate current for flowing through the switching tube is greater than the first current threshold, judge that the switching tube is open-minded in advance, wherein
First current threshold is greater than zero；And
When flowing through the immediate current of the switching tube less than the second current threshold, judge that the switching tube lag is open-minded, wherein
Second current threshold is less than zero.
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| CN201510217237.XA CN106211392B (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and its switching tube open control device and method |
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| CN201510217237.XA CN106211392B (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and its switching tube open control device and method |
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| CN107581919A (en) * | 2016-07-08 | 2018-01-16 | 肇庆市天宇进出口贸易有限公司 | A kind of cooker of controllable temperature and the method for controlling temperature |
| CN108668393A (en) * | 2017-03-29 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control apparatus and method |
| WO2019006753A1 (en) * | 2017-07-07 | 2019-01-10 | 肇庆市天宇进出口贸易有限公司 | Electromagnetic heating system of electromagnetic oven and control method therefor |
| CN110859014B (en) * | 2018-08-22 | 2021-12-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, electromagnetic heating device and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281658A (en) * | 2011-07-25 | 2011-12-14 | 深圳和而泰智能控制股份有限公司 | Synchronous signal acquiring circuit and control device for induction cooker and induction cooker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281658A (en) * | 2011-07-25 | 2011-12-14 | 深圳和而泰智能控制股份有限公司 | Synchronous signal acquiring circuit and control device for induction cooker and induction cooker |
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