CN110410834A - Analog control system and electromagnetic oven for electromagnetic oven - Google Patents
Analog control system and electromagnetic oven for electromagnetic oven Download PDFInfo
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- CN110410834A CN110410834A CN201910623883.4A CN201910623883A CN110410834A CN 110410834 A CN110410834 A CN 110410834A CN 201910623883 A CN201910623883 A CN 201910623883A CN 110410834 A CN110410834 A CN 110410834A
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- 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
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- 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- Ac-Ac Conversion (AREA)
- Electronic Switches (AREA)
Abstract
Provide the analog control system and electromagnetic oven for electromagnetic oven.Analog control system for electromagnetic oven, wherein electromagnetic oven includes switching device and electromagnetic coil, switching device makes electromagnetic coil generate high-frequency alternating magnetic field by being switched on disconnecting, the analog control system includes: switch control component, the input sampling voltage to electromagnetic oven is configured as to be compared with threshold voltage, and according to the comparison result between input sampling voltage and threshold voltage come the connecting and disconnecting of control switch device, wherein, input sampling voltage is that sampling generates after carrying out rectification and voltage division by the AC-input voltage to electromagnetic oven.
Description
The application be the applying date be on January 13rd, 2016, application No. is 201610020531.6, it is entitled " for electromagnetism
The divisional application of the application for a patent for invention of the analog control system and electromagnetic oven of furnace ".
Technical field
The present invention relates to circuit fields, relate more specifically to a kind of analog control system and electromagnetic oven for electromagnetic oven.
Background technique
Electromagnetic oven also known as electromagnetic stove are the products of modern kitchen revolution, it allows hot straight without open fire or conduction-type heating
It connects and is generated in the bottom of a pan, therefore the thermal efficiency is greatly improved.Electromagnetic oven mainly includes following two part: for generating height
The electronics systems of frequency alternating magnetic field；And for fixing electronics systems and carrying the structural shell of cookware.
Fig. 1 is the schematic diagram for showing the working principle of electromagnetic oven.As shown in Figure 1, electromagnetic oven is vortexed using magnetic field induction
Principle, by the countless magnetic confining fields that loop coil generates making pot body itself using high-frequency current, voluntarily fast heating is realized pair
The heating of food in pot.Specifically, when passing through high-frequency current in loop coil, high-frequency alternating magnetic is generated around loop coil
；When bottom (for example, the bottom of a pan of iron pot) of the magnetic line of force of high-frequency alternating magnetic field by permeability magnetic material, the bottom of a pan is handed in high frequency
Countless small vortex can be generated under the action of varying magnetic field, so that the bottom of a pan discharges rapidly out amount of heat to reach food in heating kettle
Purpose.
Fig. 2 is shown in electromagnetic oven for generating the schematic diagram of the electronics systems of high-frequency alternating magnetic field.Such as Fig. 2 institute
Show, electronics systems 200 include rectifier bridge 202, LC filter 204, electromagnetic coil (that is, loop coil above-mentioned)
206, resonant capacitance 208 and switching device 210 (for example, insulated gate bipolar transistor (IGBT)).Wherein, rectifier bridge 202
With LC filter 204 to AC-input voltage VACFull-wave rectification and LC filtering are carried out, to form the input voltage V after rectificationin；
Switching device 210 is switched on and disconnects, wherein the input voltage V when switching device 210 is connected after rectificationinIt is applied in
206 both ends of electromagnetic coil, the forward current for flowing through electromagnetic coil 206 increase, the electromagnetic coil 206 when switching device 210 disconnects
High-frequency resonant is formed with resonant capacitance 208, the voltage reversal on electromagnetic coil 206, the electric current for flowing through electromagnetic coil 206 reduces；
The variable-current for flowing through electromagnetic coil 206 forms high-frequency alternating magnetic field, and the alternate magnetic force line that high-frequency alternating magnetic field generates passes through pot
Bottom, so that the bottom of a pan generates heat.
Currently, electromagnetic oven mostly uses electronics systems shown in Fig. 2, and utilizes with micro controller unit (MCU) and be
The digital control circuit of core realizes power regulation and protection to electronics systems shown in Fig. 2.It is well known that input
Power is the product of input voltage and input current.The AC-input voltage of electronics systems 200 shown in Fig. 2 is (that is, VAC)
It is network voltage, it is substantially stationary, as long as so the average current that control is input to electronics systems 200 controls electronics
The input power of line system 200.The electric current for being input to electronics systems 200 is the electric current flowed into from power grid end, works as switch
Device 210 has electric current to flow into electronics systems 200 when connecting, when switching device 210 disconnects, no current flows into electronic circuit
System 200.So as long as control switch device 210 switches on and off to control and is input to electronics systems 200
Electric current, to control its input power.
When carrying out power regulation and protection to electronics systems shown in Fig. 2 with Digital Way, by exchange
Input voltage and the average current for flowing through switching device 210 sample come to AC-input voltage with flow through switching device 210
Average current carry out analog/digital (A/D) conversion, to form digital voltage signal and digital current signal, MCU pass through by
Digital voltage signal is multiplied with digital current signal to carry out power calculation and relatively adjusts calculated result compared with setting power
The turn-on time (Ton) of switching device 210.Because digital control operation needs the time, for immediate current and moment electricity
The control of pressure often lags.
Summary of the invention
The present invention provides a kind of analog control systems and electromagnetic oven for electromagnetic oven.
Analog control system according to an embodiment of the present invention for electromagnetic oven, wherein electromagnetic oven includes switching device and electricity
Magnetic coil, switching device make electromagnetic coil generate high-frequency alternating magnetic field, simulation control system by being switched on disconnecting
System includes: switch control component, is configured as the input sampling voltage to electromagnetic oven and is compared with threshold voltage, and according to defeated
Enter the connecting and disconnecting that the comparison result between sampling voltage and threshold voltage carrys out control switch device, wherein input sampling electricity
Pressure is that sampling generates after carrying out rectification and voltage division by the AC-input voltage to electromagnetic oven.
Electromagnetic oven according to an embodiment of the present invention, comprising: switching device；Electromagnetic coil；And above-described simulation control
System processed.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In:
Fig. 1 is the schematic diagram for showing the working principle of electromagnetic oven；
Fig. 2 is shown in electromagnetic oven for generating the schematic diagram of the electronics systems of high-frequency alternating magnetic field；
Input voltage after being rectified when Fig. 3 shows the driving signal of switching device 210 shown in Fig. 2, is struck by lightning
The waveform diagram of Vin and voltage and current when being struck by lightning on switching device 210；
Fig. 4 is the circuit diagram for showing the electronics systems of electromagnetic oven according to an embodiment of the present invention；
Fig. 5 a is the circuit diagram for showing another embodiment for the circuit part that first control signal is generated shown in Fig. 4；
Figure 5b shows that the driving signal of switching device 210, for the connecting and disconnecting of switch S1 in control figure 5a
The waveform diagram of S1 signal, input sampling voltage Vac_in, lightning strike protection threshold value Vth_H and Vth_L；
Fig. 6 a is the circuit diagram for showing the another embodiment for the circuit part that first control signal is generated shown in Fig. 4；
Fig. 6 b shows the waveform diagram of the driving voltage of switching device 210, S2 signal, S3 signal.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention never limits
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown
Art is unnecessary fuzzy to avoid causing the present invention.
Input voltage V after being rectified when Fig. 3 shows the driving signal of switching device 210 shown in Fig. 2, is struck by lightningin、
And the waveform diagram of voltage and current when being struck by lightning on switching device 210.As shown in figure 3, being in work shape in electromagnetic oven
Input voltage V in the case where being struck by lightning when state, after rectificationinIt leaps high, so that being added in the voltage liter at 206 both ends of electromagnetic coil
The slope of height, the inductive current that electromagnetic coil 206 generates increases；However, due to the lag of digital control operation, switching device
210 turn-on time Ton does not have any variation；Because the slope for the inductive current that electromagnetic coil 206 generates increases,
At the end of the turn-on time Ton of switching device 210, the peak point current I of switching device 210 is flowed throughpkIt can be more much larger than a upper period；
According toVoltage V on switching device 210IGBTIt will will increase；If the voltage V on switching device 210IGBTIt is super
Its pressure resistance is crossed, switching device 210 will demolish.Even if MCU is detected defeated after rectifying by applied input voltage circuit for detecting
Enter voltage VinIt leaps high, but MCU passes through operation, the operation time of most fast protective switch device 210 is 1.3us, makes switching device 210
Disconnection has been the thing after 1.3us, so carrying out overcurrent protection to switching device 210 using MCU is a bottleneck.
In view of above situation, the present invention provides a kind of real time lightning strike protections that electromagnetic oven is realized by simulation control
Method.Fig. 4 is the circuit diagram for showing the electronics systems of electromagnetic oven according to an embodiment of the present invention.
As shown in figure 4, the electronics systems of electromagnetic oven according to an embodiment of the present invention are in addition to including electronics shown in Fig. 2
It further include the simulation control system for realizing the real time lightning strike protection of electromagnetic oven with analog control mode other than line system 200
System 400.
In analog control system 400 shown in Fig. 4, comparator Comp 1 will input sampling voltage Vac_in and threshold value electricity
Press VthIt is compared, to generate the first control signal whether characterization has occurred lightning stroke incident, wherein input sampling voltage Vac_
In is by AC-input voltage VACGeneration is sampled after carrying out rectification and voltage division；Trsanscondutance amplifier gm is to current sample voltage
VcsWith reference voltage VrefIntegral is made the difference, to generate the power meter reference number of the input power of characterization electronics systems 200
Comp, wherein current sample voltage VcsIt is to be adopted by the electric current to the switching device 210 flowed through in electronics systems 200
What sample generated, reference voltage VrefFor characterizing the rated input power of electronics systems 200；Comparator Comp 2 is by power
Characterization signal comp and characterization flow through the Speedometer Drive of the rate of change of the electric current of the switching device 210 in electronics systems 200
Reference ramp is compared, and to generate second control signal, wherein Speedometer Drive reference ramp is in electronics systems 200
In switching device 210 connect during generate；Logic or device carry out logic to first control signal and second control signal
Or operation, to generate the first driving signal；Comparator Comp 3 will characterize VIGBTChange the voltage and threshold voltage V of slopethInto
Row compares, to generate the second driving signal, wherein characterizing VIGBTChange the voltage of slope using in electronics systems 200
Voltage V on switching device 210IGBTIt generates；Trigger drives electricity using the first driving signal or the second driving signal
Switching device 210 in sub- line system 200 connects or disconnects.
In some embodiments, when first control signal is in high level, show that lightning stroke incident has occurred；When the first control
When signal processed is in low level, show that electronics systems 200 are in normal operating conditions；When second control signal is in high electricity
Usually, show current value needed for the input current of electronics systems 200 reaches rated power；When second control signal is in
When low level, show current value needed for the input current of electronics systems 200 does not rise to rated power；When the second driving
When signal is in high level, show the V of electronics systems 200IGBTVoltage resonance is to the lowest point, that is, minimum；When the second driving letter
Number be in low level when, show VIGBTThe non-resonance of voltage cannot connect switching device 210 to the lowest point；When the first driving signal is in
When high level, trigger drives the switching device 210 in electronics systems 200 to disconnect using the first driving signal；When
When two driving signal is in high level, trigger drives electronics systems 200 to connect using the second driving signal.
In some embodiments, current sample voltage VcsReflect the size of the input current of electronics systems 200；In
Switching device 201 when power meter reference comp is more than or equal to Speedometer Drive reference ramp, in electronics systems 200
It connects (that is, the turn-on time Ton for determining switching device 210)；When the switching device 201 in electronics systems 200 disconnects
When, resonance occurs together with resonant capacitance for the electromagnetic coil in electronics systems 200, when the voltage on switching device 210 is humorous
When shaking to the lowest point, switching device 210 is connected.Due to the sensibility reciprocal and resonant capacitance of electromagnetic coil in electronics systems 200
Capacitance size be it is constant, so harmonic period substantially constant, so the time of voltage resonance on switching device 210 to the lowest point
(that is, turn-off time Toff of switching device 210) substantially constant, it is only necessary to which the turn-on time Ton of regulating switch device 210 reaches
To setting power.
Analog control system 400 can input sampling voltage Vac_in with real-time detection, when comparator Comp 1 detects thunder
Percussion disconnects switching device 210 quickly.This is primarily due to, the input voltage V when being struck by lightning, after rectificationin
It quickly increases, inductive current slope increases, and the electric current for flowing through switching device 210 within a very short time is flushed to switching device 210
Rated current；In order to disconnect switching device 210 quickly, input sampling voltage Vac_in can detecte；When input sampling electricity
Pressure Vac_in makes switching device 210 disconnected when being at any time more than threshold value protection voltage Vth (for example, lightning strike protection threshold value)
It opens, so that the electric current for flowing through switching device 210 be avoided to leap high.In this way, both ensure that the electric current for flowing through switching device 210 was switching
Within the scope of the rated current of device 210, and guarantee not exceeding in the turn-off time interior resonance voltage of following switching device 210
The voltage rating of switching device 210.
Due to input sample voltage Vac_in be sine wave, if lightning strike protection threshold value be fixed value, taken in input
Sample voltage Vac_in can not be protected in time in the case where being struck by lightning when having not yet been reached at the top of sine wave, and different inputs
This threshold value is difficult to set under voltage conditions.So in some embodiments, will not be mutated using input sinusoidal voltage
Principle, a certain fixed time during the switching device 210 of electronics systems 200 disconnects is to input sampling voltage Vac_in
It is sampled, the voltage sampled is superimposed certain DC component △ V again, obtains lightning strike protection threshold value Vth_H and/or Vth_
L.When being struck by lightning, AC-input voltage VACIt increases rapidly, input sample voltage Vac_in can be higher than lightning strike protection threshold value
Vth_H, the reflection delay time of comparator is within 100ns, so switching device 210 can quickly be made to disconnect, guarantees switch
The trouble free service of device 210.Sometimes, lightning stroke voltage and AC-input voltage are reversed, then inputting sampling voltage Vac_in can be lower than
Lightning strike protection threshold value Vth_L also can quickly be such that switching device 210 disconnects at this time, guarantee its trouble free service.
In the following, the specific processing that will combine Fig. 5 a-5b and Fig. 6 a-6b that determining lightning strike protection threshold value is described in detail.
Fig. 5 a is the circuit diagram for showing another embodiment for the circuit part that first control signal is generated shown in Fig. 4.
Figure 5b shows that the driving signal of switching device 210, for the switch S1 in control figure 5a connecting and disconnecting S1 signal, defeated
Enter the waveform diagram of sampling voltage Vac_in and lightning strike protection threshold value Vth_H and Vth_L.It can be seen that in conjunction with Fig. 5 a and Fig. 5 b
By a buffer isolation input sampling voltage Vac_in, then use S1 signal to input during switching device 210 disconnects
Sampling voltage Vac_in is sampled, and the voltage sampled subtracts 0.3V and obtains Vth_L, and the voltage sampled adds 0.3V
For Vth_H.When inputting sampling voltage Vac_in higher than Vth_H or lower than Vth_L, the first control letter of high level is exported
Number.
Fig. 6 a is the circuit diagram for showing the another embodiment for the circuit part that first control signal is generated shown in Fig. 4.
Fig. 6 b show switching device 210 driving voltage, for the switch S2 in control figure 6a connecting and disconnecting S2 signal, with
And the waveform diagram of the S3 signal of the connecting and disconnecting for the switch S3 in control figure 6a.Due to only in embodiment shown in Fig. 5 a
A capacitor has been used, so detection can be missed if be struck by lightning in the shorter pulse times of S1 signal, cannot timely have been sent out
Raw protection.So can using circuit shown in Fig. 6 a, use capacitor C1 write down the voltage of sampling instant as it is non-sampled when sentence
Disconnected reference voltage uses capacitor C2 to write down the voltage before sampling as judgement reference voltage when sampling.Judge that reference voltage subtracts
0.3V is lightning strike protection threshold value Vth_L, judges reference voltage plus 0.3V for lightning strike protection threshold value Vth_H.When input sample electricity
When Vac_in being pressed to be higher than Vth_H or be lower than Vth_L, the first control voltage of high level is exported.
Above-described analog control system is applicable to the electromagnetic oven of various power grades, can when lightning stroke incident occurs
Quickly disconnect switching device, so as to avoid the overcurrent-overvoltage of switching device from damaging.
The present invention can realize in other specific forms, without departing from its spirit and essential characteristics.For example, particular implementation
Algorithm described in example can be modified, and system architecture is without departing from essence spirit of the invention.Therefore, currently
Embodiment be all counted as being exemplary rather than in all respects it is limited, the scope of the present invention by appended claims rather than
Foregoing description definition, also, the meaning of claim and whole changes in the range of equivalent are fallen into all be included in
Among the scope of the present invention.
Claims (7)
1. a kind of analog control system for electromagnetic oven, the electromagnetic oven includes switching device and electromagnetic coil, the switch
Device makes the electromagnetic coil generate high-frequency alternating magnetic field by being switched on disconnecting, which includes:
Switch control component is configured as being compared the input sampling voltage of the electromagnetic oven with threshold voltage, and according to
Comparison result between the input sampling voltage and the threshold voltage controls the connecting and disconnecting of the switching device,
In, the input sampling voltage is that sampling generates after carrying out rectification and voltage division by the AC-input voltage to the electromagnetic oven.
2. analog control system according to claim 1, wherein the switch control component is additionally configured to described defeated
When entering sampling voltage greater than the threshold voltage, the switching device is disconnected.
3. analog control system according to claim 1, wherein the switch control component is additionally configured to open described
During closing device disconnection, the input sampling voltage sample using sampled signal and utilizes sampled result and predetermined direct current
The stack result of component is as the threshold voltage.
4. analog control system according to claim 1, wherein the switch control component is additionally configured to open described
During closing device disconnection, it is utilized respectively the first sampled signal and the second sampled signal and the input sampling voltage is sampled,
And when non-sampled using the stack result of the sampled result obtained using first sampled signal and predetermined direct current component as
The threshold voltage, in sampling by the sampled result obtained using second sampled signal and the predetermined direct current component
Stack result is as the threshold voltage.
5. analog control system according to claim 3 or 4, wherein the predetermined direct current component includes positive DC component
Both with negative DC component, the switch control component is additionally configured to be utilized respectively the positive DC component and the negative direct current
Component calculates the threshold voltage.
6. analog control system according to claim 5, wherein the switch control component is additionally configured to the electricity
The power meter reference number of magnetic furnace is compared with Speedometer Drive reference number, and is characterized according to the power meter reference number and the rate
The comparison result of signal controls the connecting and disconnecting of the switching device, wherein
The power meter reference number is used to characterize the input power of the electromagnetic oven and is by current sample voltage and ginseng
Examine voltage carry out difference-product it is mitogenetic at, the current sample voltage is by sampling to the electric current for flowing through the switching device
It generating, the reference voltage is used to characterize the rated input power of the electromagnetic oven,
The Speedometer Drive reference number is used to characterize the rate of change for the electric current for flowing through the electromagnetic coil.
7. a kind of electromagnetic oven, comprising:
Switching device；
Electromagnetic coil；And
Analog control system according to claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910623883.4A CN110410834A (en) | 2016-01-13 | 2016-01-13 | Analog control system and electromagnetic oven for electromagnetic oven |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910623883.4A CN110410834A (en) | 2016-01-13 | 2016-01-13 | Analog control system and electromagnetic oven for electromagnetic oven |
| CN201610020531.6A CN105465847A (en) | 2016-01-13 | 2016-01-13 | Analog control system for electromagnetic oven and electromagnetic oven |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610020531.6A Division CN105465847A (en) | 2016-01-13 | 2016-01-13 | Analog control system for electromagnetic oven and electromagnetic oven |
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| Publication Number | Publication Date |
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| CN110410834A true CN110410834A (en) | 2019-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910623883.4A Pending CN110410834A (en) | 2016-01-13 | 2016-01-13 | Analog control system and electromagnetic oven for electromagnetic oven |
| CN201610020531.6A Pending CN105465847A (en) | 2016-01-13 | 2016-01-13 | Analog control system for electromagnetic oven and electromagnetic oven |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610020531.6A Pending CN105465847A (en) | 2016-01-13 | 2016-01-13 | Analog control system for electromagnetic oven and electromagnetic oven |
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| CN (2) | CN110410834A (en) |
| TW (1) | TWI584694B (en) |
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- 2016-01-13 CN CN201910623883.4A patent/CN110410834A/en active Pending
- 2016-01-13 CN CN201610020531.6A patent/CN105465847A/en active Pending
- 2016-03-08 TW TW105107101A patent/TWI584694B/en active
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| US5687065A (en) * | 1994-11-28 | 1997-11-11 | Philips Electronics North America Corporation | Pre-regulator with light switch to limit voltage ringing on turn-off |
| CN104242658A (en) * | 2014-09-19 | 2014-12-24 | 无锡芯朋微电子股份有限公司 | Valley-switching digital control circuit of switch power source |
| CN104703312A (en) * | 2015-03-16 | 2015-06-10 | 昂宝电子（上海）有限公司 | Control circuit and control method for induction cooker and induction cooker |
| CN104850019A (en) * | 2015-03-16 | 2015-08-19 | 昂宝电子（上海）有限公司 | Control circuit, control method thereof, and induction cooker |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105465847A (en) | 2016-04-06 |
| TWI584694B (en) | 2017-05-21 |
| TW201725934A (en) | 2017-07-16 |
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