CN106152193A - Electromagnetic heating system and pan testing circuit, detection method - Google Patents
Electromagnetic heating system and pan testing circuit, detection method Download PDFInfo
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- CN106152193A CN106152193A CN201510164715.5A CN201510164715A CN106152193A CN 106152193 A CN106152193 A CN 106152193A CN 201510164715 A CN201510164715 A CN 201510164715A CN 106152193 A CN106152193 A CN 106152193A
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Abstract
The invention discloses the pan testing circuit of a kind of electromagnetic heating system, including: bleeder circuit, bleeder circuit is connected with the resonance circuit in electromagnetic heating system respectively, and the high-frequency oscillation signal that bleeder circuit produces for detecting resonance circuit is to generate the first low-voltage signal synchronized；Peaker, peaker carries out phase shift and processes to generate the second low-voltage signal the first low-voltage signal；Comparison circuit, output switching activity signal when comparison circuit judges that in resonance circuit, the collector voltage of R-T tube is minimum according to the second low-voltage signal,；Microprocessor, microprocessor counts according to energizing signal, and judges whether there is pan in electromagnetic heating system according to upset number of times in Preset Time.This pan testing circuit can accurately determine whether pan and exist, and circuit is simple and reliable.The invention also discloses the pan detection method of a kind of electromagnetic heating system and a kind of electromagnetic heating system.
Description
Technical field
The present invention relates to household electrical appliance technical field, the pan particularly to a kind of electromagnetic heating system is examined
The pan detection method of slowdown monitoring circuit, a kind of electromagnetic heating system and a kind of electromagnetic heating system.
Background technology
In electromagnetic heating system, if existing without pan and opening triggering signal and begin to warm up, can make
All power consumptions, on resonance coil, cause the phenomenon that resonance coil burns.
Existing electromagnetic heating system generally use resonance coil two ends intrinsic standoff ratio compared with mode, by record
Umber of pulse exists to determine whether pan, and testing circuit is more complicated.
Summary of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
To this end, it is an object of the present invention to propose the pan testing circuit of a kind of electromagnetic heating system,
Can accurately determine whether pan to exist, circuit is simple and reliable.
Further object is that a kind of electromagnetic heating system of proposition.Another mesh of the present invention
Be to propose the pan detection method of a kind of electromagnetic heating system.
For reaching above-mentioned purpose, one aspect of the present invention embodiment proposes the pot of a kind of electromagnetic heating system
Tool testing circuit, including bleeder circuit, described bleeder circuit humorous with electromagnetic heating system respectively
The circuit that shakes be connected, described bleeder circuit for detect described resonance circuit produce high-frequency oscillation signal with
Generate the first low-voltage signal synchronized；Peaker, described peaker is connected with described bleeder circuit,
Described peaker carries out phase shift and processes to generate the second low-voltage signal described first low-voltage signal；Ratio
Relatively circuit, described comparison circuit is connected with described peaker, and described comparison circuit is according to described second
Low-voltage signal judges output switching activity letter when the collector voltage of R-T tube is minimum in described resonance circuit
Number；Microprocessor, described microprocessor is connected with described comparison circuit, and described microprocessor is according to institute
State energizing signal to count, and judge described Electromagnetic Heating system according to upset number of times in Preset Time
Whether system exists pan.
The pan testing circuit of electromagnetic heating system according to embodiments of the present invention, bleeder circuit detection is humorous
The high-frequency oscillation signal that the circuit that shakes produces is to generate the first low-voltage signal synchronized, and peaker is to first
Low-voltage signal carries out phase shift and processes to generate the second low-voltage signal, and comparison circuit is according to the second low-voltage signal
Judge output switching activity signal, microprocessor when the collector voltage of R-T tube is minimum in resonance circuit
Count according to energizing signal, and judge electromagnetic heating system according to upset number of times in Preset Time
In whether there is pan.Therefore, the pan testing circuit energy of the electromagnetic heating system of the embodiment of the present invention
Enough accurately determining whether pan to exist, circuit is simple and reliable.
According to one embodiment of present invention, in described Preset Time, described electromagnetic heating system is judged
In when whether there is described pan, wherein, if described upset number of times is less than preset times, described micro-
Processor judges to exist in described electromagnetic heating system described pan；If described upset number of times is more than
In described preset times, there is not described pan in electromagnetic heating system described in described microprocessor judges.
According to one embodiment of present invention, after described electromagnetic heating system is started working, described micro-
Processor sends the pan detection signal extremely described R-T tube of Preset Time width, and described humorous
The switching tube that shakes closes has no progeny, and described resonance circuit produces described high-frequency oscillation signal.
According to one embodiment of present invention, described bleeder circuit specifically includes: the first resistance, described
One end of first resistance is connected with the colelctor electrode of described R-T tube；Second resistance, described second electricity
One end of resistance is connected with the other end of described first resistance, the other end ground connection of described second resistance, institute
State, between one end of the second resistance and the other end of described first resistance, there is primary nodal point.
According to one embodiment of present invention, described peaker includes active differentiator and passive micro-
Parallel circuit.
According to one embodiment of present invention, when described peaker is described passive peaker,
Described passive peaker specifically includes: the first electric capacity, one end of described first electric capacity and described first
Node is connected；3rd resistance, one end of described 3rd resistance is connected with the other end of described first electric capacity,
The other end ground connection of described 3rd resistance, another of one end of described 3rd resistance and described first electric capacity
Having secondary nodal point between end, described secondary nodal point is connected with described comparison circuit.
According to another embodiment of the invention, when described peaker is described active differentiator,
Described active differentiator specifically includes: the second electric capacity, one end of described second electric capacity and described first
Node is connected；First comparator, the negative input end of described first comparator is another with described second electric capacity
One end is connected, and the positive input terminal of described first comparator passes through the 4th resistance eutral grounding, and described first compares
The outfan of device is connected with described comparison circuit；5th resistance, described 5th resistance is connected to described
Between negative input end and the outfan of described first comparator of one comparator.
According to one embodiment of present invention, described comparison circuit specifically includes: the 6th resistance, described
One end of 6th resistance is connected with default power supply；Second comparator, the positive input of described second comparator
End is connected with described peaker, and the negative input end of described second comparator is another with described 6th resistance
One end is connected, and the ground end ground connection of described second comparator, the power end of described second comparator is with described
Presetting power supply to be connected, the outfan of described second comparator is connected with described microprocessor；7th resistance,
Described 7th resistance is connected to the negative input end of described second comparator and the ground end of described second comparator
Between.
Additionally, embodiments of the invention also proposed a kind of electromagnetic heating system, it includes above-mentioned electricity
The pan testing circuit of magnetic heating system.
This electromagnetic heating system can accurately be sentenced by the pan testing circuit of above-mentioned electromagnetic heating system
Disconnected with or without pan existence, improve the reliability of system.
For reaching above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of electromagnetic heating system
Pan detection method, comprises the following steps: the high frequency that in detection electromagnetic heating system, resonance circuit produces
Oscillator signal is to generate the first low-voltage signal synchronized；Described first low-voltage signal is carried out phase shift process
To generate the second low-voltage signal；Judge that in described resonance circuit, resonance is opened according to described second low-voltage signal
Output switching activity signal when the collector voltage of pass pipe is minimum；Count according to described energizing signal, and
In Preset Time, judge whether described electromagnetic heating system exists pan according to upset number of times.
The pan detection method of electromagnetic heating system according to embodiments of the present invention, first detection electromagnetism adds
The high-frequency oscillation signal that in hot systems, resonance circuit produces is to generate the first low-voltage signal synchronized, then
First low-voltage signal carries out phase shift process to generate the second low-voltage signal, and according to the second low-voltage signal
Judge output switching activity signal when the collector voltage of R-T tube is minimum in resonance circuit, and according to
Energizing signal counts, and in Preset Time according to upset number of times judge electromagnetic heating system is
No there is pan.Therefore, the pan detection method of the electromagnetic heating system of the embodiment of the present invention can be accurate
Really determining whether pan to exist, method is simple and reliable.
According to one embodiment of present invention, in Preset Time, described electromagnetism is judged according to upset number of times
Whether heating system exists pan, specifically includes: if described upset number of times is less than preset times,
Electromagnetic heating system described in described microprocessor judges exists described pan；If described upset number of times
More than or equal to described preset times, there is not institute in electromagnetic heating system described in described microprocessor judges
State pan.
According to one embodiment of present invention, after described electromagnetic heating system is started working, send pre-
If the pan detection signal of time width is to described R-T tube, and turns off at described R-T tube
After, described resonance circuit produces described high-frequency oscillation signal.
Aspect and advantage that the present invention adds will part be given in the following description, and part will be from following
Description in become obvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Present invention aspect that is above-mentioned and/or that add and advantage are from retouching embodiment below in conjunction with the accompanying drawings
Will be apparent from easy to understand in stating, wherein:
Fig. 1 is the circuit of the pan testing circuit of the electromagnetic heating system according to one embodiment of the invention
Figure；
Fig. 2 be the peaker according to another embodiment of the present invention be the circuit of active differentiator
Figure；
Fig. 3 is according to the signal waveforms in the electromagnetic heating system of one embodiment of the invention；And
Fig. 4 is the pan detection method flow chart of the electromagnetic heating system according to the embodiment of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, its
In the most same or similar label represent same or similar element or there is same or like merit
The element of energy.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this
Bright, and be not construed as limiting the claims.
Following disclosure provides many different embodiments or example for realizing the different knots of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.
Certainly, they are the most merely illustrative, and are not intended to limit the present invention.Additionally, the present invention is permissible
Repeat reference numerals and/or letter in different examples.This repetition is to simplify and clearly mesh
, itself do not indicate the relation between discussed various embodiment and/or setting.Additionally, the present invention
The various specific technique provided and the example of material, but those of ordinary skill in the art can anticipate
Know the property of can be applicable to other techniques and/or the use of other materials.It addition, described below first
Feature second feature it " on " structure can include what the first and second features were formed as directly contacting
Embodiment, it is also possible to include the embodiment that other feature is formed between the first and second features, this
Sample the first and second feature is not likely to be directly contact.
In describing the invention, it should be noted that unless otherwise prescribed and limit, term " installs ",
" be connected ", " connection " should be interpreted broadly, for example, it may be mechanically connected or electrical connection, it is also possible to
It is the connection of two element internals, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
For the ordinary skill in the art, the concrete of above-mentioned term can be understood as the case may be
Implication.
The pan inspection of the electromagnetic heating system proposed according to embodiments of the present invention is described with reference to the accompanying drawings
The pan inspection of slowdown monitoring circuit, the electromagnetic heating system with this pan testing circuit and electromagnetic heating system
Survey method.
Fig. 1 is the circuit of the pan testing circuit of the electromagnetic heating system according to one embodiment of the invention
Figure.As it is shown in figure 1, the pan testing circuit of this electromagnetic heating system includes bleeder circuit 10, differential
Circuit 20, comparison circuit 30 and microprocessor 40.
Wherein, bleeder circuit 10 is connected with the resonance circuit in electromagnetic heating system respectively, bleeder circuit
The first low-voltage signal that 10 high-frequency oscillation signals produced for detecting resonance circuit synchronize with generation.Micro-
Parallel circuit 20 is connected with bleeder circuit 10, and peaker 20 carries out phase shift process to the first low-voltage signal
To generate the second low-voltage signal, comparison circuit 30 is connected with peaker 20, comparison circuit 30 basis
Second low-voltage signal judges that when the collector voltage of R-T tube Q1 is minimum in resonance circuit, output is turned over
Rotaring signal, microprocessor 40 is connected with comparison circuit 30, and microprocessor 40 is carried out according to energizing signal
Counting, and judge whether electromagnetic heating system exists pan according to upset number of times in Preset Time.
Wherein, electromagnetic heating system can be electromagnetic oven, electric cooker and pressure cooker etc., and Preset Time can
To demarcate according to practical situation.
According to one embodiment of present invention, in Preset Time, judge whether electromagnetic heating system is deposited
When pan, wherein, if upset number of times is less than preset times, microprocessor 40 judges Electromagnetic Heating
System exists pan；If upset number of times is more than or equal to preset times, microprocessor 40 judges electromagnetism
Heating system does not exist pan.
Wherein, preset times can be demarcated according to practical situation.
According to one embodiment of present invention, after electromagnetic heating system is started working, microprocessor 40
Send the pan detection signal of Preset Time width to R-T tube Q1, and at R-T tube Q1
Having no progeny in pass, resonance circuit produces high-frequency oscillation signal.
Wherein, R-T tube Q1 can be IGBT (Insulated Gate Bipolar Transistor,
Insulated gate bipolar transistor), and, Preset Time width can be demarcated according to practical situation.
According to one embodiment of present invention, as it is shown in figure 1, bleeder circuit 10 specifically includes the first electricity
Resistance R1 and the second resistance R2, wherein, one end of the first resistance R1 and the current collection of R-T tube Q1
Pole C is connected, and one end of the second resistance R2 is connected with the other end of the first resistance R1, the second resistance
Between one end and the other end of the first resistance R1 of the other end ground connection GND of R2, the second resistance R2
There is primary nodal point J1.
It is understood that by the first resistance R1 and the second resistance R2 of series connection to R-T tube
The voltage of the colelctor electrode C of Q1 carries out the purpose of dividing potential drop and is present to ensure that the electricity through bleeder circuit 10 output
Corrugating is Tong Bu with the voltage waveform of the colelctor electrode C of R-T tube Q1.
In an embodiment of the present invention, peaker 20 can include active differentiator and passive differential
Circuit.
According to one embodiment of present invention, as it is shown in figure 1, working as peaker 20 is passive differential electricity
Lu Shi, passive peaker specifically includes the first electric capacity C1 and the 3rd resistance R3, wherein, the first electricity
The one end holding C1 is connected with primary nodal point J1, and one end of the 3rd resistance R3 is another with the first electric capacity C1's
One end is connected, the other end ground connection GND of the 3rd resistance R3, one end of the 3rd resistance R3 and the first electricity
Between the other end of appearance C1, there is secondary nodal point J2, secondary nodal point J2 to be connected with comparison circuit 30.
According to another embodiment of the invention, as in figure 2 it is shown, working as peaker 20 is active differential
During circuit, active differentiator specifically includes the second electric capacity C2, the first comparator P1, the 4th resistance
R4 and the 5th resistance R5, wherein, one end of the second electric capacity C2 is connected with primary nodal point J1, and first
The negative input end of comparator P1 and the other end of the second electric capacity C2 are connected, and the first comparator P1 is just
Input passes through the 4th resistance R4 ground connection GND, the outfan of the first comparator P1 and comparison circuit
30 are connected, and the 5th resistance R5 is connected to negative input end and the first comparator P1 of the first comparator P1
Outfan between.
According to one embodiment of present invention, as it is shown in figure 1, comparison circuit 30 specifically includes the 6th electricity
Resistance R6, the second comparator P2 and the 7th resistance R7, wherein, one end of the 6th resistance R6 is with default
Power supply VCC is connected, and the positive input terminal of the second comparator P2 is connected with peaker 20, and second compares
The negative input end of device P2 and the other end of the 6th resistance R6 are connected, the ground termination of the second comparator P2
Ground GND, the power end of the second comparator P2 is connected with default power supply VCC, the second comparator P2
Outfan be connected with microprocessor 40, the 7th resistance R7 is connected to the negative input of the second comparator P2
Between end and the ground end of the second comparator P2.
Specifically, as shown in Figure 1, Figure 3, after electromagnetic heating system is started working, microprocessor
40 send the pan that Preset Time width is t1 detects signal to R-T tube Q1, R-T tube
Q1 turns off after opening Preset Time width t1.Have no progeny, by resonant inductance when R-T tube Q1 closes
The resonance circuit of L1 and resonant capacitance C3 composition produces high-frequency oscillation signal S0.
High-frequency oscillation signal S0 produces first Tong Bu with high-frequency oscillation signal S0 through bleeder circuit 10
Low-voltage signal S1, generates the second low-voltage signal S2 after being then passed through peaker 20 phase shift.Second is low
After pressure signal S2 compares with the preset signals in comparison circuit 30, output switching activity signal CMO1
To microprocessor 40.
Microprocessor 40 closes to have no progeny at R-T tube Q1 and starts timing and count, when timing time reaches
During to preset time t 2, the upset number of times of the energizing signal CMO1 of microprocessor 40 record is JS.
If the upset number of times JS of the energizing signal CMO1 of microprocessor 40 record is little in preset time t 2
In preset times, then microprocessor 40 judges to exist in electromagnetic heating system pan；If when default
Between in t2 the upset number of times JS of the energizing signal CMO1 of microprocessor 40 record more than or equal to presetting time
Number, then microprocessor 40 judges not exist in electromagnetic heating system pan.
As seen from Figure 3,10 collector voltages that need to detect R-T tube Q1 of bleeder circuit
For number of times time minimum to determine the number of times of preset time t 2 interior resonance circuit generation resonance, so that it is determined that
With the presence of non-loaded such as pan.Meanwhile, 10 voltages that need to detect resonance circuit one end of this bleeder circuit,
Instead of in correlation technique by resonance coil two ends intrinsic standoff ratio compared with by the way of determine whether pan exist,
Circuit is simple and reliable.
In sum, the pan testing circuit of electromagnetic heating system according to embodiments of the present invention, dividing potential drop
The high-frequency oscillation signal that electric circuit inspection resonance circuit produces is to generate the first low-voltage signal synchronized, differential
Circuit carries out phase shift and processes to generate the second low-voltage signal the first low-voltage signal, and comparison circuit is according to the
Two low-voltage signals judge output switching activity letter when the collector voltage of R-T tube is minimum in resonance circuit
Number, microprocessor counts according to energizing signal, and judges according to upset number of times in Preset Time
Whether electromagnetic heating system exists pan.Therefore, the pot of the electromagnetic heating system of the embodiment of the present invention
Tool testing circuit can accurately determine whether pan and exist, and circuit is simple and reliable.
Additionally, embodiments of the invention also proposed a kind of electromagnetic heating system, it includes above-mentioned electricity
The pan testing circuit of magnetic heating system.
This electromagnetic heating system can accurately be sentenced by the pan testing circuit of above-mentioned electromagnetic heating system
Disconnected with or without pan existence, improve the reliability of system.
Fig. 4 is the pan detection method flow chart of the electromagnetic heating system according to the embodiment of the present invention.As
Shown in Fig. 4, the pan detection method of this electromagnetic heating system comprises the following steps:
S1, the high-frequency oscillation signal that in detection electromagnetic heating system, resonance circuit produces is to generate synchronization
First low-voltage signal.
Wherein, electromagnetic heating system can be electromagnetic oven, electric cooker and pressure cooker etc..
S2, carries out phase shift and processes to generate the second low-voltage signal the first low-voltage signal.
According to the second low-voltage signal, S3, judges that in resonance circuit, the collector voltage of R-T tube is minimum
Time output switching activity signal.
S4, counts according to energizing signal, and judges electromagnetism according to upset number of times in Preset Time
Whether heating system exists pan.
According to one embodiment of present invention, in Preset Time, Electromagnetic Heating is judged according to upset number of times
Whether system exists pan, specifically includes: if upset number of times is less than preset times, microprocessor
Judge electromagnetic heating system exists pan；If upset number of times is more than or equal to preset times, micro-process
Device judges not exist in electromagnetic heating system pan.
According to one embodiment of present invention, after electromagnetic heating system is started working, when sending default
Between width pan detection signal to R-T tube, and R-T tube close have no progeny, resonance circuit
Produce high-frequency oscillation signal.
A concrete example according to the present invention, as shown in Figure 1, Figure 3, when electromagnetic heating system is opened
After beginning work, microprocessor sends pan that Preset Time width is t1 detection signal to R-T tube,
R-T tube turns off after opening Preset Time width t1.Have no progeny when R-T tube closes, by resonance electricity
The resonance circuit that sense becomes with resonance capacitance group produces high-frequency oscillation signal S0.
It is low that high-frequency oscillation signal S0 produces first Tong Bu with high-frequency oscillation signal S0 through bleeder circuit
Pressure signal S1, generates the second low-voltage signal S2 after being then passed through peaker phase shift.Second low-voltage signal
After S2 compares with the preset signals in comparison circuit, output switching activity signal CMO1 is to microprocessor.
Microprocessor closes to have no progeny at R-T tube and starts timing and count, when timing time reaches default
During time t2, the upset number of times of the energizing signal CMO1 of microprocessor records is JS.If in advance
If the upset number of times JS of the energizing signal CMO1 of microprocessor records is less than preset times in time t2,
Then there is pan in microprocessor judges electromagnetic heating system；If microprocessor in preset time t 2
The upset number of times JS of the energizing signal CMO1 of record is more than or equal to preset times, then microprocessor judges
Electromagnetic heating system does not exist pan.
The pan detection method of electromagnetic heating system according to embodiments of the present invention, first detection electromagnetism adds
The high-frequency oscillation signal that in hot systems, resonance circuit produces is to generate the first low-voltage signal synchronized, then
First low-voltage signal carries out phase shift process to generate the second low-voltage signal, and according to the second low-voltage signal
Judge output switching activity signal when the collector voltage of R-T tube is minimum in resonance circuit, and according to
Energizing signal counts, and in Preset Time according to upset number of times judge electromagnetic heating system is
No there is pan.Therefore, the pan detection method of the electromagnetic heating system of the embodiment of the present invention can be accurate
Really determining whether pan to exist, method is simple and reliable.
In flow chart or at this any process described otherwise above or method describe it is understood that
For, represent and include one or more performing for the step that realizes specific logical function or process
The module of code, fragment or the part of instruction, and the scope of the preferred embodiment of the present invention includes
Realization additionally, wherein can not be by order that is shown or that discuss, including according to involved function
By basic mode simultaneously or in the opposite order, performing function, these should be by embodiments of the invention
Person of ordinary skill in the field is understood.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is possible to
It is considered as the sequencing list of executable instruction for realizing logic function, may be embodied in and appoint
In what computer-readable medium, for instruction execution system, device or equipment (such as computer based
System, include the system of processor or other can be from instruction execution system, device or equipment instruction fetch
And perform the system of instruction) use, or combine these instruction execution systems, device or equipment and use.
For the purpose of this specification, " computer-readable medium " can be any can comprise, store, communicate,
Propagate or transmission procedure for instruction execution system, device or equipment or combine these instruction execution systems,
Device or equipment and the device that uses.(non-exclusive arranges the more specifically example of computer-readable medium
Table) include following: there is the electrical connection section (electronic installation) of one or more wiring, portable meter
Calculation machine tray salver (magnetic device), random access memory (RAM), read only memory (ROM),
Erasable read only memory (EPROM or flash memory) of editing, fiber device, and portable
Formula compact disc read-only memory (CDROM).It addition, computer-readable medium can even is that can be at it
The paper of the described program of upper printing or other suitable media, because can be such as by paper or other Jie
Matter carries out optical scanning, then carries out editing, interpret or processing with other suitable methods if desired
Electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can use hardware, software, firmware or combinations thereof
Realize.In the above-described embodiment, multiple steps or method can be with storing in memory and by closing
Software or firmware that suitable instruction execution system performs realize.Such as, if realized with hardware,
As in another embodiment, any one in available following technology well known in the art or they
Combination realize: have and patrol for the discrete of logic gates that data signal is realized logic function
Collect circuit, there is the special IC of suitable combination logic gate circuit, programmable gate array
(PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that realize that above-described embodiment method carries whole
Or part steps can be by program and completes to instruct relevant hardware, described program can store
In a kind of computer-readable recording medium, this program upon execution, including the step of embodiment of the method
One or a combination set of.
Additionally, each functional unit in each embodiment of the present invention can be integrated in a processing module
In, it is also possible to it is that unit is individually physically present, it is also possible to two or more unit are integrated in
In one module.Above-mentioned integrated module both can realize to use the form of hardware, it would however also be possible to employ soft
The form of part functional module realizes.If described integrated module realizes with the form of software function module
And during as independent production marketing or use, it is also possible to it is stored in an embodied on computer readable storage and is situated between
In matter.
Storage medium mentioned above can be read only memory, disk or CD etc..
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ",
It is concrete that the description of " concrete example " or " some examples " etc. means to combine this embodiment or example describes
Feature, structure, material or feature are contained at least one embodiment or the example of the present invention.?
In this specification, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.
And, the specific features of description, structure, material or feature can be in any one or more realities
Execute in example or example and combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for those of ordinary skill in the art
For, it is possible to understand that without departing from the principles and spirit of the present invention can be to these embodiments
Carry out multiple change, revise, replace and modification, the scope of the present invention by claims and etc.
With limiting.
Claims (12)
1. the pan testing circuit of an electromagnetic heating system, it is characterised in that including:
Bleeder circuit, described bleeder circuit is connected with the resonance circuit in electromagnetic heating system respectively, institute
State bleeder circuit for detecting the high-frequency oscillation signal of described resonance circuit generation to generate first synchronized
Low-voltage signal；
Peaker, described peaker is connected with described bleeder circuit, and described peaker is to described
First low-voltage signal carries out phase shift and processes to generate the second low-voltage signal；
Comparison circuit, described comparison circuit is connected with described peaker, and described comparison circuit is according to institute
State the second low-voltage signal and judge output when the collector voltage of R-T tube is minimum in described resonance circuit
Energizing signal；
Microprocessor, described microprocessor is connected with described comparison circuit, and described microprocessor is according to institute
State energizing signal to count, and judge described Electromagnetic Heating system according to upset number of times in Preset Time
Whether system exists pan.
2. the pan testing circuit of electromagnetic heating system as claimed in claim 1, it is characterised in that
When judging in described Preset Time whether described electromagnetic heating system exists described pan, wherein,
If described upset number of times is less than preset times, Electromagnetic Heating system described in described microprocessor judges
System exists described pan；
If described upset number of times is more than or equal to described preset times, electricity described in described microprocessor judges
Magnetic heating system does not exist described pan.
3. the pan testing circuit of electromagnetic heating system as claimed in claim 1 or 2, its feature exists
In, after described electromagnetic heating system is started working, described microprocessor sends Preset Time width
Pan detection signal is to described R-T tube, and has no progeny in described R-T tube pass, described resonance
Circuit produces described high-frequency oscillation signal.
4. the pan testing circuit of electromagnetic heating system as claimed in claim 1 or 2, its feature exists
In, described bleeder circuit specifically includes:
First resistance, one end of described first resistance is connected with the colelctor electrode of described R-T tube；
Second resistance, one end of described second resistance is connected with the other end of described first resistance, described
The other end ground connection of the second resistance, the other end of one end of described second resistance and described first resistance it
Between there is primary nodal point.
5. the pan testing circuit of electromagnetic heating system as claimed in claim 4, it is characterised in that
Described peaker includes active differentiator and passive peaker.
6. the pan testing circuit of electromagnetic heating system as claimed in claim 5, it is characterised in that
When described peaker is described passive peaker, described passive peaker specifically includes:
First electric capacity, one end of described first electric capacity is connected with described primary nodal point；
3rd resistance, one end of described 3rd resistance is connected with the other end of described first electric capacity, described
The other end ground connection of the 3rd resistance, one end of described 3rd resistance and the other end of described first electric capacity it
Between there is secondary nodal point, described secondary nodal point is connected with described comparison circuit.
7. the pan testing circuit of electromagnetic heating system as claimed in claim 5, it is characterised in that
When described peaker is described active differentiator, described active differentiator specifically includes:
Second electric capacity, one end of described second electric capacity is connected with described primary nodal point；
First comparator, the other end phase of the negative input end of described first comparator and described second electric capacity
Even, the positive input terminal of described first comparator passes through the 4th resistance eutral grounding, described first comparator defeated
Go out end to be connected with described comparison circuit；
5th resistance, described 5th resistance is connected to the negative input end of described first comparator and described the
Between the outfan of one comparator.
8. the pan testing circuit of electromagnetic heating system as claimed in claim 1 or 2, its feature exists
In, described comparison circuit specifically includes:
6th resistance, one end of described 6th resistance is connected with default power supply；
Second comparator, the positive input terminal of described second comparator is connected with described peaker, described
The negative input end of the second comparator is connected with the other end of described 6th resistance, described second comparator
Ground end ground connection, the power end of described second comparator is connected with described default power supply, and described second compares
The outfan of device is connected with described microprocessor；
7th resistance, described 7th resistance is connected to the negative input end of described second comparator and described the
Between the ground end of two comparators.
9. an electromagnetic heating system, it is characterised in that include institute as any one of claim 1-8
The pan testing circuit of the electromagnetic heating system stated.
10. the pan detection method of an electromagnetic heating system, it is characterised in that comprise the following steps:
The high-frequency oscillation signal that in detection electromagnetic heating system, resonance circuit produces is to generate first synchronized
Low-voltage signal；
Described first low-voltage signal carries out phase shift process to generate the second low-voltage signal；
The collector voltage of R-T tube in described resonance circuit is judged according to described second low-voltage signal
Output switching activity signal time minimum；
Count according to described energizing signal, and judge described according to upset number of times in Preset Time
Whether electromagnetic heating system exists pan.
The pan detection method of 11. electromagnetic heating systems as claimed in claim 10, it is characterised in that
In Preset Time, judge whether described electromagnetic heating system exists pan, specifically according to upset number of times
Including:
If described upset number of times is less than preset times, Electromagnetic Heating system described in described microprocessor judges
System exists described pan；
If described upset number of times is more than or equal to described preset times, electricity described in described microprocessor judges
Magnetic heating system does not exist described pan.
The pan detection method of 12. electromagnetic heating systems as described in claim 10 or 11, it is special
Levy and be, after described electromagnetic heating system is started working, send the pan detection of Preset Time width
Signal is to described R-T tube, and has no progeny in described R-T tube pass, and described resonance circuit produces
Described high-frequency oscillation signal.
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| CN108738182A (en) * | 2017-04-14 | 2018-11-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its method for heating and controlling |
| CN110049588A (en) * | 2018-01-15 | 2019-07-23 | 佛山市顺德区美的电热电器制造有限公司 | Cookware detection method, device and the electromagnetic oven of electromagnetic oven |
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