CN105816023A - Electric pressure cooker and control method for same - Google Patents
Electric pressure cooker and control method for same Download PDFInfo
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- CN105816023A CN105816023A CN201610393424.8A CN201610393424A CN105816023A CN 105816023 A CN105816023 A CN 105816023A CN 201610393424 A CN201610393424 A CN 201610393424A CN 105816023 A CN105816023 A CN 105816023A
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- cooking saucepan
- oscillating circuit
- pressure cooking
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/086—Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/0802—Control mechanisms for pressure-cookers
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cookers (AREA)
Abstract
The invention relates to the field of cooking equipment and discloses an electric pressure cooker and a control method for the same. The electric pressure cooker comprises a pressure detection switch, a second coil, an oscillating circuit, an oscillating circuit parameter detection circuit and a control circuit, wherein the second coil is in a parallel connection with the pressure detection switch; mutual inductance effects can be generated between the first coil in the oscillating circuit and the second coil; the oscillating circuit parameter detection circuit is used to detect oscillating circuit parameters of the oscillating circuit; and the control circuit determines whether a pressure in the electric pressure cooker reaches a preset value according to the detected oscillating circuit parameters. The electric pressure cooker and the method provided by the invention have the advantages that a layout position of the pressure detection switch in the electric pressure cooker will not be limited, so that structural design and structural optimization of the electric pressure cooker can be implemented easily.
Description
Technical field
The present invention relates to cooking equipment field, in particular it relates to a kind of electric pressure cooking saucepan and control method thereof.
Background technology
In current electric pressure cooking saucepan, in order to the on off operating mode of pressure switch is detected, need to use electric wire pressure switch to be electrically connected with testing circuit.But, the existence of electric wire limits pressure switch position in electric pressure cooking saucepan, this structure design being unfavorable for electric pressure cooking saucepan and structure optimization.
Summary of the invention
It is an object of the invention to provide a kind of electric pressure cooking saucepan and control method thereof, pressure detection switch position in electric pressure cooking saucepan will not be caused restriction by it, thus the beneficially structure design of electric pressure cooking saucepan and structure optimization.
To achieve these goals, the present invention provides a kind of electric pressure cooking saucepan, it is characterised in that this electric pressure cooking saucepan includes: pressure detection switch；Second coil, this second coil is in parallel with described pressure detection switch；Oscillating circuit, can produce mutual inductance effect between first coil and described second coil in this oscillating circuit；Oscillating circuit electrical parameter detection circuit, for detecting the oscillating circuit parameter of described oscillating circuit；And control circuit, it is used for according to the oscillating circuit parameter detected to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
The present invention also provides for the control method of a kind of described electric pressure cooking saucepan, and the method includes: detected the oscillating circuit parameter of described oscillating circuit by described oscillating circuit electrical parameter detection circuit；And by described control circuit according to the oscillating circuit parameter that detects to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
Pass through technique scheme, owing to make use of the mutual inductance effect between coil to judge whether the pressure in electric pressure cooking saucepan reaches preset value according to the technology of the present invention, this a kind of radio detection mode, therefore pressure detection switch placement location in electric pressure cooking saucepan will not be caused restriction by it, thus the beneficially structure design of electric pressure cooking saucepan and structure optimization.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below.In the accompanying drawings:
Fig. 1 is the structural representation of the electric pressure cooking saucepan according to one embodiment of the present invention；
Fig. 2 is the structural representation of the electric pressure cooking saucepan according to a further embodiment of this invention；
Fig. 3 is the another example according to the oscillating circuit in the electric pressure cooking saucepan of the present invention；
Fig. 4 with Fig. 5 respectively illustrates according to the position relative with the second coil of the first coil in the electric pressure cooking saucepan of present invention exemplary plot；
Fig. 6 is the exemplary circuit figure according to the oscillating circuit electrical parameter detection circuit in the electric pressure cooking saucepan of the present invention；
Fig. 7 is the structural representation of the electric pressure cooking saucepan according to a further embodiment of this invention；
Fig. 8 is according to the first coil in the electric pressure cooking saucepan of the present invention, the second coil and the scheme of installation of pressure detection switch；And
Fig. 9 is the flow chart of the control method of the electric pressure cooking saucepan according to one embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
The present invention provides a kind of electric pressure cooking saucepan, as it is shown in figure 1, this electric pressure cooking saucepan can include pressure detection switch the 10, second coil 20, oscillating circuit 30, oscillating circuit electrical parameter detection circuit 40 and control circuit 50.Wherein: the second coil 20 is in parallel with pressure detection switch 10；Mutual inductance effect can be produced between first coil 301 and described second coil 20 in oscillating circuit 30；Oscillating circuit electrical parameter detection circuit 40 is for detecting the oscillating circuit parameter of described oscillating circuit 30；And control circuit 50 is used for according to the oscillating circuit parameter detected to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
Pass through technique scheme, owing to make use of the mutual inductance effect between coil to judge whether the pressure in electric pressure cooking saucepan reaches preset value according to the technology of the present invention, this a kind of radio detection mode, therefore the pressure detection switch 10 placement location in electric pressure cooking saucepan will not be caused restriction by it, thus the beneficially structure design of electric pressure cooking saucepan and structure optimization.Such as, by using according to the structure of the present invention, pressure detection switch 10 can be placed on any position in electric pressure cooking saucepan, such as on the bottom of a pan, in pot or pot cover is first-class.It addition, also advantageously improve the performances such as the pressure control precision of electric pressure cooking saucepan according to the electric pressure cooker structure of the present invention.
The operation principle of the electric pressure cooking saucepan shown in Fig. 1 is as follows: after electric pressure cooking saucepan is started working, when electric pressure cooking saucepan does not plays pressure, pressure detection switch 10 closes, when oscillating circuit 30 resonance, mutual inductance effect can be produced between first coil 301 and the second coil 20, therefore the second coil 20 in parallel with pressure detection switch 10 can produce faradic current, make the second coil 20 that the state of first coil 301 is created impact, mainly show as have impact on the inductance value of first coil 301, namely the inductance value of first coil 301 can be made to diminish；After electric pressure cooking saucepan plays pressure and reaches preset pressure, pressure detection switch 10 disconnects, second coil 20 now in parallel with pressure detection switch 10 is opened a way, therefore will not produce mutual inductance effect between the first coil 301 in the second coil 20 and oscillating circuit 30, the second coil 20 will not produce impact to the parameter of oscillating circuit 30.So, i.e. can detect that whether the pressure in electric pressure cooking saucepan reaches preset value by the inductance value change of detection first coil 301, and then the pressure control precision of electric pressure cooking saucepan can be improved, and improve the performance of electric pressure cooking saucepan.
Although being above the operation principle that pressure detection switch 10 when electric pressure cooking saucepan pressure closes, electric pressure cooking saucepan plays pressure and pressure detection switch 10 describes electric pressure cooking saucepan as a example by disconnecting after reaching preset pressure, but pressure detection switch 10 is also configured to when electric pressure cooking saucepan does not plays pressure disconnect, and closes after electric pressure cooking saucepan plays pressure and reaches preset pressure.
It addition, the change of the inductance value of first coil 301, influence whether a lot of parameters of oscillating circuit 30 in turn: (1) influences whether the resonant frequency of oscillating circuit 30；(2), be applied in the excitation of fixed frequency at oscillating circuit 30 in the case of, the power of oscillating circuit 30 is influenced whether.Therefore, by the change of these parameters of detection oscillating circuit 30, it is also possible to accurately determine whether the pressure in electric pressure cooking saucepan reaches preset value.Sum it up, preset value whether can be reached by the pressure that the change of at least one parameter following of detection oscillating circuit 30 determines in electric pressure cooking saucepan according to the electric pressure cooking saucepan of the present invention: the inductance value of described first coil 301, the frequency of oscillation (because the change of frequency of oscillation also reflects the change of the inductance value of first coil 301) of described oscillating circuit 30 and oscillating circuit 30 have been applied in the power (reflecting the change of the inductance value of first coil 301 because of the change of power) of described oscillating circuit 30 in the case of the excitation of fixed frequency.
Additionally, skilled person would appreciate that, although with LC antiresonant circuit for being illustrated oscillating circuit 30 in Fig. 1, but the particular circuit configurations of oscillating circuit 30 is not limited by the present invention, namely comprise and can meet the requirement of the present invention with any oscillating circuit structure of the coil that the second coil 20 produces mutual inductance effect.Such as, oscillating circuit 30 can be LC series resonant circuit as shown in Figure 2, and oscillating circuit 30 can also is that resonance circuit is strangled in west as shown in Figure 3.
According in a preferred embodiment of the present invention, described first coil 301 can be arranged to the relative position of described second coil 20 enable the electromagnetic field of generation in described first coil 301 to pass the coverage of described second coil 20, so that the electromagnetic field of described first coil 301 and described second coil 20 can intercouple.Preferably, spacing between described first coil 301 and described second coil 20 can be that several millimeters is to several centimeters, can be such as 0-200cm, more preferably 0-100cm, so that when pressure detection switch 10 closes, obvious mutual inductance effect can be produced, so that the present invention can judge whether the pressure in electric pressure cooking saucepan reaches preset value to improve pressure control precision more accurately between first coil 301 and the second coil 20.Preferably, in the range of the inductance value of first coil 301 may be located at 0-100mh.
Fig. 4 shows a relative position exemplary plot of first coil 301 and the second coil 20, wherein, described first coil 301 and described second coil 20 are cylindrical coil, one of them cylindrical coil is placed in another cylindrical coil, Fig. 4 such as showing, first coil 301 is placed in the second coil 20, it practice, can also is that and the second coil 20 is placed in first coil 301.Whether preset value is reached of course for the pressure that can judge more accurately in electric pressure cooking saucepan, first coil 301 and the second coil 20 are preferably by coaxial placement, so that when pressure detection switch 10 closes, obvious mutual inductance effect can be produced between first coil 301 and the second coil 20.
Fig. 5 shows another relative position exemplary plot of first coil 301 and the second coil 20, and wherein, described first coil 301 and described second coil 20 are planar coil and staggered relatively.Whether preset value is reached of course for the pressure that can judge more accurately in electric pressure cooking saucepan, first coil 301 and the second coil 20 are preferably by coaxial placement, so that when pressure detection switch 10 closes, obvious mutual inductance effect can be produced between first coil 301 and the second coil 20.
It will be apparent to a skilled person that Fig. 4 with Fig. 5 is only the relative position schematically illustrating first coil 301 with the second coil 20.The arrangement of first coil 301 with the second coil 20 is not limited by the application, as long as when pressure detection switch 10 closes, the electromagnetic field produced in first coil 301 can through the coverage of the second coil 20 so that the electromagnetic field of first coil 301 and the second coil 20 can intercouple, as long as namely the layout of first coil 301 and the second coil 20 parameter that makes the second coil 20 can affect oscillating circuit 30 when pressure detection switch 10 closes can meet the requirement of the application.
Additionally, the concrete structure of oscillating circuit electrical parameter detection circuit 40 is not limited by the present invention, as long as the related parameter (such as, one or more in the inductance value of frequency, power, first coil 301) that has of oscillating circuit 30 can be carried out detecting by it.Fig. 6 shows the circuit diagram of a kind of exemplary oscillating circuit electrical parameter detection circuit 40, its a kind of shaping circuit, this shaping circuit exports the signal relevant with the frequency of oscillation of oscillating circuit 30 by lead-out terminal out1 to control circuit 50, and such control circuit 50 just frequency of oscillation based on oscillating circuit 30 change can judge whether the pressure in electric pressure cooking saucepan reaches preset value.When the oscillating circuit electrical parameter detection circuit 40 shown in Fig. 6 is used in combination with the west Le oscillating circuit shown in Fig. 3, the lead-out terminal out that the west shown in input terminal in Fig. 3 of this oscillating circuit electrical parameter detection circuit 40 can be strangled oscillating circuit electrically connect.
It addition, the concrete structure of control circuit 50 is not limited by the present invention, as long as whether it can reach preset value according to the pressure that the testing result of oscillating circuit electrical parameter detection circuit 40 judges in electric pressure cooking saucepan.Such as, control circuit 50 can be single-chip microcomputer, FPGA, PLC etc..
It addition, the pressure switch of existing electric pressure cooking saucepan is all installed on the bottom of a pan.After electric pressure cooking saucepan plays pressure, pressure switch is applied pressure to detect pot inner pressure by this pressure switch.That is, the pressure shell fragment contact the bottom of a pan of this pressure switch is to experience the displacement that pressure change produces, promoting stream spring assembly, the break-make of a pair silver contact by being riveted on spring assembly realizes the detection to pot inner pressure.But, the shortcoming of this configuration is, pressure switch is indirectly to the detection of pot inner pressure, because pressure switch the most directly contacts the steam in pot；And putting on the pressure in pressure switch is not the whole pressure in electric pressure cooking saucepan, because also having other fixed pivots to assume responsibility for the partial pressure in pot.Therefore, this configuration of existing electric pressure cooking saucepan can cause problems with.One, due to the reason of structure own, the pressure proportional that fixed pivot undertakes cannot guarantee concordance, and the pressure control error causing electric pressure cooking saucepan is very big, and needs to verify one by one when producing, and substantially increases production difficulty.They are two years old, after electric pressure cooking saucepan is used certain time, owing to the high temperature of heat-generating disc affects, fixed pivot can be caused to sink, cause the pressure proportional apportioned by these fixed pivots to decline, pressure proportional apportioned on pressure transducer increases, and then make the pressure of electric pressure cooking saucepan decline, have impact on the performance of electric pressure cooking saucepan.
Disadvantages mentioned above based on existing electric pressure cooking saucepan, according in the another preferred implementation of the present invention, the pressure detection switch 10 steam pressure in directly detection electric pressure cooking saucepan, that is, this pressure detection switch 10 directly contacts with the steam in pot.Therefore, compared to existing electric pressure cooking saucepan, the accuracy of detection according to the pressure detection switch 10 in the electric pressure cooking saucepan of the present invention is higher so that the pressure control precision according to the electric pressure cooking saucepan of the present invention is higher.
According in the another preferred implementation of the present invention, as shown in Figure 7, this electric pressure cooking saucepan can also include the resistance 60 in parallel with described second coil 20, in order to the second coil 20 near first coil 301 time, first coil 301 can sense the close of the second coil 20.
According in the another preferred implementation of the present invention, described pressure detection switch 10 and described second coil 20 are preferably mounted on the pot cover of described electric pressure cooking saucepan and described pressure detection switch 10 directly gos deep in described electric pressure cooking saucepan, described first coil 301 is then preferably mounted in the pot of described electric pressure cooking saucepan, as shown in Figure 8.Owing to pressure detection switch 10 directly gos deep in electric pressure cooking saucepan, therefore the pressure that pressure detection switch 10 is detected is directly the steam pressure in pot, rather than as prior art, the pressure in the bottom of a pan is shared with other fixed pivots, therefore the electric pressure cooking saucepan according to the present invention is the most accurate to the detection of pot inner pressure, therefore, it is possible to improve the performances such as the pressure control precision of electric pressure cooking saucepan.
Additionally, when the embodiment shown in Fig. 7 and Fig. 8 is used in combination, due to the second coil 20 near first coil 301 time, first coil 301 can sense the close of the second coil 20, therefore can also realize detecting the function whether pot cover is covered according to the electric pressure cooking saucepan of the present invention.
Should be understood that, the position in pot is not limited to shown in Fig. 8 in pot covering position and first coil 301 for pressure detection switch 10 and the second coil 20, as long as the electromagnetic field produced in described first coil 301 can be through the coverage of described second coil 20 so that the electromagnetic field of described first coil 301 and described second coil 20 can intercouple and just can meet the requirement of the application.Such as, pressure detection switch the 10, second coil 20 and first coil 301 can be disposed in the pot of electric pressure cooking saucepan, on pot cover or on the bottom of a pan simultaneously.
The present invention also provides for the control method of a kind of electric pressure cooking saucepan as above, as it is shown in figure 9, the method may comprise steps of:
Step S1, detected the oscillating circuit parameter of described oscillating circuit 30 by described oscillating circuit electrical parameter detection circuit 40；And
Step S2, by described control circuit 50 according to the oscillating circuit parameter detected to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
Preferably, in the method according to the invention, pressure detection switch 10 directly detects the pressure of the steam in electric pressure cooking saucepan, that is, this pressure detection switch 10 directly contacts with the steam in pot；Pressure switch of the prior art is then that the detection the bottom of a pan is applied to the pressure in this pressure switch, and pressure switch the most of the prior art is indirectly to the detection of pot inner pressure, because it the most directly contacts the steam in pot.Therefore, compared to the control method of existing electric pressure cooking saucepan, the pressure control precision according to the control method of the present invention is higher.
nullAdditionally，Due to after starting working according to the electric pressure cooking saucepan of the present invention，When electric pressure cooking saucepan does not plays pressure，Pressure detection switch 10 closes，When oscillating circuit 30 resonance，Mutual inductance effect can be produced between first coil 301 and the second coil 20，Therefore the second coil 20 in parallel with pressure detection switch 10 can produce faradic current，Make the second coil 20 that the state of first coil 301 is created impact，Mainly show as have impact on the inductance value of first coil 301，Namely the inductance value of first coil 301 can be made to diminish，After playing pressure according to the electric pressure cooking saucepan of the present invention and reaching preset pressure，Pressure detection switch 10 disconnects，Second coil 20 now in parallel with pressure detection switch 10 is opened a way，Therefore mutual inductance effect will not be produced between the first coil 301 in the second coil 20 and oscillating circuit 30，Second coil 20 will not produce impact to the parameter of oscillating circuit 30，Therefore，In the present invention，The second coil 20 can be utilized to judge whether the pressure in electric pressure cooking saucepan reaches preset value on the impact of the state of first coil 301，And then the pressure control precision of electric pressure cooking saucepan can be improved，And improve the performance of electric pressure cooking saucepan.Although being above that pressure detection switch 10 when electric pressure cooking saucepan pressure closes, electric pressure cooking saucepan plays pressure and pressure detection switch 10 being described as a example by disconnecting after reaching preset pressure, but the control method according to the present invention can also be provided in when electric pressure cooking saucepan does not plays pressure at pressure detection switch 10 and disconnect, and judges whether the pressure in electric pressure cooking saucepan reaches preset value and then the heating of control heating module after electric pressure cooking saucepan is pressed and reached preset pressure in the case of Guan Bi.
It addition, the change of the inductance value of first coil 301, influence whether a lot of parameters of oscillating circuit 30 in turn: (1) influences whether the resonant frequency of oscillating circuit 30；(2), be applied in the excitation of fixed frequency at oscillating circuit 30 in the case of, the power of oscillating circuit 30 is influenced whether.Therefore, by the change of these parameters of detection oscillating circuit 30, whether preset value is reached according to the pressure that the control method of the present invention just can accurately determine in electric pressure cooking saucepan.Sum it up, preset value whether can be reached by the pressure that the change of at least one parameter following of detection oscillating circuit 30 determines in electric pressure cooking saucepan according to the control method of the present invention: the inductance value of described first coil 301, the frequency of oscillation (because the change of frequency of oscillation also reflects the change of the inductance value of first coil 301) of described oscillating circuit 30 and oscillating circuit 30 have been applied in the power (reflecting the change of the inductance value of first coil 301 because of the change of power) of described oscillating circuit 30 in the case of the excitation of fixed frequency.
Detect by oscillating circuit electrical parameter detection circuit 40 below and illustrate as a example by the frequency of oscillation of oscillating circuit 30.First, the frequency of oscillation of oscillating circuit 30 is detected by oscillating circuit electrical parameter detection circuit 40, and testing result is sent to control circuit 50, such as, oscillating circuit electrical parameter detection circuit 40 can send the square-wave signal relevant with the frequency of oscillation of oscillating circuit 30 to control circuit 50.Then, according to the testing result that oscillating circuit electrical parameter detection circuit 40 sends, control circuit 50 determines whether the pressure in electric pressure cooking saucepan reaches preset value, such as, if the frequency of the square-wave signal that oscillating circuit electrical parameter detection circuit 40 sends is decreased to second frequency value from first frequency value, then illustrate that the second coil 20 does not produces impact to the state of first coil 301, therefore pressure detection switch 10 disconnects, if the frequency of the square-wave signal that oscillating circuit electrical parameter detection circuit 40 sends increases to first frequency value from second frequency value, then illustrate that the second coil 20 creates impact to the state of first coil 301, therefore pressure detection switch 10 closes, and whether the pressure that the disconnection of pressure detection switch 10 and Guan Bi also reflects in electric pressure cooking saucepan reaches preset value.So, just the performances such as preset value, and then the pressure control precision of raising electric pressure cooking saucepan can whether be reached by the pressure that simple wireless mode judges in electric pressure cooking saucepan according to the control method of the present invention.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can be carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in the case of reconcilable, can be combined by any suitable means.In order to avoid unnecessary repetition, various possible compound modes are illustrated by the present invention the most separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. an electric pressure cooking saucepan, it is characterised in that this electric pressure cooking saucepan includes:
Pressure detection switch；
Second coil, this second coil is in parallel with described pressure detection switch；
Oscillating circuit, can produce mutual inductance effect between first coil and described second coil in this oscillating circuit；
Oscillating circuit electrical parameter detection circuit, for detecting the oscillating circuit parameter of described oscillating circuit；And
Control circuit, is used for according to the oscillating circuit parameter detected to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
Electric pressure cooking saucepan the most according to claim 1, it is characterized in that, described first coil is arranged to the relative position of described second coil enable the electromagnetic field of generation in described first coil to pass the coverage of described second coil, so that the electromagnetic field of described first coil and described second coil can intercouple.
Electric pressure cooking saucepan the most according to claim 2, it is characterised in that described first coil and described second coil are cylindrical coil, and one of them cylindrical coil is placed in another cylindrical coil.
Electric pressure cooking saucepan the most according to claim 2, it is characterised in that described first coil and described second coil are planar coil and staggered relatively.
5. according to the electric pressure cooking saucepan described in claim 3 or 4, it is characterised in that described first coil and described second coil are coaxial.
6. according to the electric pressure cooking saucepan described in claim 3 or 4, it is characterised in that the spacing between described first coil and described second coil is 0-100cm.
Electric pressure cooking saucepan the most according to claim 1, it is characterised in that described oscillating circuit parameter includes following at least one: the inductance value of described first coil, the frequency of oscillation of described oscillating circuit and the power of described oscillating circuit.
Electric pressure cooking saucepan the most according to claim 1, it is characterised in that this electric pressure cooking saucepan also includes and the resistance of described second coils from parallel connection of coils.
9. according to the electric pressure cooking saucepan described in any claim in Claims 1-4,7 and 8, it is characterised in that described pressure detection switch is for detecting the steam pressure in described electric pressure cooking saucepan.
Electric pressure cooking saucepan the most according to claim 9, it is characterized in that, described pressure detection switch and described second coil are installed on the pot cover of described electric pressure cooking saucepan and described pressure detection switch directly gos deep in described electric pressure cooking saucepan, and described first coil is installed in the pot of described electric pressure cooking saucepan.
11. 1 kinds of control methods according to the electric pressure cooking saucepan described in any claim in claim 1 to 10, it is characterised in that the method includes:
The oscillating circuit parameter of described oscillating circuit is detected by described oscillating circuit electrical parameter detection circuit；And
By described control circuit according to the oscillating circuit parameter detected to judge whether the pressure in described electric pressure cooking saucepan reaches preset value.
12. methods according to claim 11, it is characterised in that described oscillating circuit parameter includes following at least one: the inductance value of described first coil, the frequency of oscillation of described oscillating circuit and the power of described oscillating circuit.
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