CN104939666B - Upward pressure detection method for pressure container and electric pressure cooker - Google Patents
Upward pressure detection method for pressure container and electric pressure cooker Download PDFInfo
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Abstract
The invention discloses a method for detecting the upper pressure of a pressure container and an electric pressure cooker. Wherein, the method comprises the following steps: a switching circuit for opening or closing according to an input pulse signal; the electromagnetic induction circuit is connected with the switching circuit and used for generating induced electromotive force according to the disconnection or the connection of the switching circuit; when a magnetic conduction device of the pressure container is close to the electromagnetic induction circuit, the currently generated induced electromotive force is reduced, and the electromagnetic induction circuit outputs a first voltage signal; when the magnetic conduction device is far away from the electromagnetic induction circuit, the currently generated induced electromotive force is increased, and the electromagnetic induction circuit outputs a second voltage signal, wherein the first voltage signal indicates that the pressure container is in an upper pressure state, and the second voltage signal indicates that the pressure container is in a non-pressure state. The invention solves the technical problem of detection error caused by small volume and small action surface of the reed switch in the prior art.
Description
Technical Field
The invention relates to the field of pressure detection, in particular to an upward pressure detection method of a pressure container and an electric pressure cooker.
Background
At present, in the conventional pressure detecting device for pressure cooker, as shown in fig. 1, a permanent magnet 104 is disposed at the top end of a check valve 102, when pressure is generated in the cooker, the pressure pushes the check valve 102 to rise, and the permanent magnet 104 closes a reed pipe 106 by magnetic force, so as to detect the pressure in the cooker; similarly, when the pressure in the cooker is exhausted, the pressure in the cooker is insufficient, the check valve 102 falls off due to gravity, and at this time, the reed switch 106 is disconnected due to no magnetic force, so that no pressure in the cooker is detected.
However, the reed switch has a small volume and a small action surface, and the magnetic force discreteness of the permanent magnet is large, so that an upper pressure signal cannot be detected when a production workshop is slightly biased, detection errors are easy to cause, and the reed switch is provided with a mechanical contact, is packaged by glass, is easy to break under the impact condition, and causes machine cooking hour reporting faults with a certain probability. In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a pressure vessel upward pressure detection method and an electric pressure cooker, which at least solve the technical problem of detection errors caused by small volume and small acting surface of a reed switch in the prior art.
According to an aspect of an embodiment of the present invention, there is provided an electric pressure cooker including: a switching circuit for opening or closing according to an input pulse signal; the electromagnetic induction circuit is connected with the switching circuit and used for generating induced electromotive force according to the disconnection or the connection of the switching circuit; when a magnetic conduction device of the pressure container is close to the electromagnetic induction circuit, the currently generated induced electromotive force is reduced, and the electromagnetic induction circuit outputs a first voltage signal; when the magnetic conduction device is far away from the electromagnetic induction circuit, the currently generated induced electromotive force is increased, and the electromagnetic induction circuit outputs a second voltage signal, wherein the first voltage signal indicates that the pressure container is in an upper pressure state, and the second voltage signal indicates that the pressure container is in a non-pressure state.
Optionally, the electromagnetic induction circuit includes an inductor connected to the switching circuit, and a charge storage element connected to an output of the inductor.
Optionally, the electromagnetic induction circuit further includes a rectifying circuit connected to an output end of the inductor, and a filtering circuit connected to an output end of the rectifying circuit; the rectifier circuit is used for converting a first sine wave signal generated by the inductor into a first direct current signal; the filter circuit is used for filtering the first direct current signal to obtain a first voltage signal; the rectifying circuit is further used for converting a second sine wave signal generated by the inductor into a second direct current signal; the filter circuit is further configured to filter the second direct current signal to obtain the second voltage signal.
Optionally, the rectifier circuit includes a rectifier diode, wherein an anode of the rectifier diode is connected to the output terminal of the inductor, and a cathode of the rectifier diode is connected to the input terminal of the filter circuit.
Optionally, the filter circuit includes a filter capacitor, wherein one end of the filter capacitor is connected to the output end of the rectifier circuit, and the other end of the filter capacitor is grounded.
Optionally, the electromagnetic induction circuit further includes a load resistor, wherein one end of the load resistor is connected to the output end of the rectifying circuit, and the other end of the load resistor is grounded.
Optionally, the electromagnetic induction circuit further comprises: and the current limiting resistor is arranged between the inductor and the rectifying circuit.
Optionally, the switching circuit includes a first switching tube and a second switching tube connected in parallel with each other; when the pulse signal is at a high level, the first switch tube is closed, and the second switch tube is opened; when the pulse signal is at a low level, the first switch tube is opened, and the second switch tube is closed.
Optionally, the first switching tube is an NPN-type triode, wherein a collector of the first switching tube is connected to a working power supply, a base of the first switching tube is connected to an external single chip microcomputer, the base of the first switching tube is used for receiving the pulse signal, and an emitter of the first switching tube is connected to the input end of the electromagnetic induction circuit; the second switch tube is a PNP type triode, wherein a collector of the second switch tube is grounded, a base of the second switch tube is connected with the external single chip microcomputer, the base of the second switch tube is used for receiving the pulse signal, and an emitting electrode of the second switch tube is connected with an emitting electrode of the first switch tube.
Optionally, the device further comprises a first resistor, wherein one end of the first resistor is connected with the switch circuit, and the other end of the first resistor is connected with an external single chip microcomputer.
Optionally, the magnetic conducting device is a permanent magnet or a magnetic core.
Optionally, the charge storage element is a capacitor.
Optionally, the magnetic conduction device is arranged at the top end of the valve.
According to another aspect of the embodiments of the present invention, there is also provided a method for detecting an upward pressure of a pressure vessel, including: the electric pressure cooker receives the pulse signal to generate induced electromotive force; when the magnetic conduction device is close to the electric pressure cooker, the currently generated induced electromotive force is reduced, and the electric pressure cooker outputs a first voltage signal, wherein the first voltage signal indicates that the pressure container is in an upper pressure state; when the magnetic conduction device is far away from the electric pressure cooker, the currently generated induced electromotive force is increased, and the electric pressure cooker outputs a second voltage signal, wherein the second voltage signal indicates that the pressure container is in a non-pressure state.
In the embodiment of the invention, an electromagnetic induction mode is adopted, and by arranging the switch circuit and the electromagnetic induction circuit, when the magnetic conduction device is close to the electromagnetic induction circuit, the electromagnetic induction circuit outputs a first voltage signal indicating that the pressure container is in a pressure-up state, and when the magnetic conduction device is far away from the electromagnetic induction circuit, the electromagnetic induction circuit outputs a second voltage signal indicating that the pressure container is in a pressure-free state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a partial structure of a pressure cooker according to the prior art;
FIG. 2 is a schematic structural view of an alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 3 is a schematic view of another alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of another alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 5 is a schematic view of a further alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of another alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of another alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of yet another alternative electric pressure cooker according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of yet another alternative electric pressure cooker according to an embodiment of the present invention;
fig. 10 is a schematic structural view of another alternative electric pressure cooker according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, there is provided an electric pressure cooker, as shown in fig. 2, the apparatus including:
a switching circuit 202 for opening or closing according to an input pulse signal;
the electromagnetic induction circuit 204 is connected with the switch circuit 202 and is used for generating induced electromotive force according to the opening or closing of the switch circuit 202; wherein,
when a magnetic conduction device of the pressure container is close to the electromagnetic induction circuit 204, the currently generated induced electromotive force is reduced, and the electromagnetic induction circuit 204 outputs a first voltage signal; when the magnetic conducting device is far away from the electromagnetic induction circuit 204, the currently generated induced electromotive force is increased, and the electromagnetic induction circuit 204 outputs a second voltage signal, wherein the first voltage signal indicates that the pressure container is in an upper pressure state, and the second voltage signal indicates that the pressure container is in a non-pressure state.
In the embodiment of the invention, the external singlechip sends the pulse signal to the switching circuit, so that the switching circuit is opened or closed according to the pulse signal. The Pulse signal may be a PWM (Pulse Width Modulation) signal, where PWM is a technology in which an analog control module performs Pulse Width Modulation to control an analog circuit by using a digital output of a microprocessor; the external single chip may be an MCU (Micro Control Unit) or any single chip having an a/D (Analog/Digital) conversion function, and the embodiment of the present invention is not limited thereto.
Optionally, as shown in fig. 3, the electromagnetic induction circuit 204 includes an inductor 302 connected to the switching circuit 202, and a power storage element 304 connected to an output of the inductor 302.
In the embodiment of the present invention, the Inductor 302 is also called an Inductor (Inductor), and an element capable of converting electric energy into magnetic energy to be stored is composed of a winding (also called a coil). When a current flows through the coil, a magnetic field induction is formed in the coil, and the induced magnetic field can generate an induced current to resist the current flowing through the coil, and the interaction relationship between the current and the coil is called an electric inductive reactance, namely inductance, and the inductance is a property of a closed loop, namely when the current flowing through the closed loop changes, an electromotive force can be generated to resist the change of the current, namely, the inductance 302 is formed, and the power storage element 304 connected with the output end of the inductance 302 generates the induced electromotive force according to the opening or closing of the switch circuit 202.
Optionally, as shown in fig. 4, the electromagnetic induction circuit 204 further includes a rectifying circuit 402 connected to the output terminal of the inductor 302, and a filtering circuit 404 connected to the output terminal of the rectifying circuit 402; wherein:
as an implementation manner, the rectifier circuit 402 is configured to convert a first sine wave signal generated by the inductor 302 into a first dc signal; the filter circuit 404 is configured to filter the first direct current signal to obtain the first voltage signal;
as another implementation manner, the rectifier circuit 402 is further configured to convert a second sine wave signal generated by the inductor 302 into a second direct current signal; the filter circuit 404 is further configured to filter the second direct current signal to obtain the second voltage signal.
In the embodiment of the invention, when a magnetic conduction device of a pressure container is close to an inductor, the magnetic flux of the inductor is reduced, so that the induced electromotive force generated at present is reduced, the inductor outputs a first sine wave signal, a rectifying circuit rectifies the first sine wave signal and converts the first sine wave signal into a first direct current signal, and a filter circuit filters the first direct current signal to obtain a first voltage signal; when the magnetic conduction device of the pressure container is far away from the inductor, the magnetic flux of the inductor is increased, so that the induced electromotive force generated at present is increased, the inductor can output a second sine wave signal, the rectifying circuit rectifies the second sine wave signal, the second sine wave is converted into a second direct current signal, and further the filtering circuit filters the second direct current signal to obtain a second voltage signal.
Optionally, as shown in fig. 5, the rectifying circuit 402 includes a rectifying diode 502, wherein an anode of the rectifying diode is connected to the output terminal of the inductor 302, and a cathode of the rectifying diode 502 is connected to the input terminal of the filtering circuit 404.
In the embodiment of the invention, the rectifying circuit is a circuit for converting alternating current electric energy into direct current electric energy, and is used for converting alternating current into unidirectional pulsating direct current. One important characteristic of a rectifying diode is one-way conductivity, and in a circuit, current can only flow in from the anode and flow out from the cathode of the rectifying diode. It may comprise a PN junction having two terminals, a positive and a negative terminal. The P region is a hole of a carrier, the carrier of the N region is an electron, a certain barrier is formed between the P region and the N region, and when a voltage for making the P region relative to the N region is applied, the barrier is lowered, and stored carriers are generated near two sides of the barrier, and the barrier can pass a large current, has a low voltage drop, and is called a forward conduction state. When a reverse voltage is applied, the potential barrier is increased, a high reverse voltage can be borne, and a small reverse current flows, which is called a reverse blocking state. The rectifier diode may be made of semiconductor germanium or silicon, and the embodiments of the present invention are not limited thereto.
Optionally, as shown in fig. 6, the filter circuit 404 includes a filter capacitor 602, wherein one end of the filter capacitor 602 is connected to the output end of the rectifier circuit 404, and the other end of the filter capacitor 602 is grounded.
In the embodiment of the invention, the filter capacitor is an energy storage device which is arranged at two ends of the rectifying circuit and used for reducing the coefficient of alternating current pulsating wave and improving high-efficiency smooth current output. In all circuits which need to convert alternating current into direct current, the filter capacitor is arranged, so that the working performance of the electronic circuit is more stable, and meanwhile, the interference of alternating ripple waves to the electronic circuit is reduced.
Optionally, as shown in fig. 7, the electromagnetic induction circuit 204 further includes a load resistor 702, wherein one end of the load resistor 702 is connected to the output end of the rectifying circuit 402, and the other end of the load resistor 702 is grounded. In the embodiment of the invention, the output end of the rectifying circuit is connected with the load resistor, so that the electromagnetic induction circuit forms a loop.
Optionally, as shown in fig. 8, the electromagnetic induction circuit 204 further includes: a current limiting resistor 802 disposed between the inductor 302 and the rectifying circuit 402. In the embodiment of the invention, the current-limiting resistor is arranged between the inductor and the rectifying circuit so as to protect electronic devices in the electromagnetic induction circuit from being burnt out due to overlarge current.
Optionally, as shown in fig. 9, the switching circuit 202 includes a first switching tube 902 and a second switching tube 904 connected in parallel; when the pulse signal is at a high level, the first switch tube 902 is closed, and the second switch tube 904 is opened; when the pulse signal is at a low level, the first switch tube 902 is open and the second switch tube 904 is closed.
In the embodiment of the present invention, as shown in fig. 9, the first switching tube is an NPN type triode, wherein a collector of the first switching tube is connected to a working power supply, a base of the first switching tube is connected to an external single chip microcomputer, the base of the first switching tube is configured to receive the pulse signal, and an emitter of the first switching tube is connected to an input end of the electromagnetic induction circuit; the second switch tube is a PNP type triode, wherein a collector of the second switch tube is grounded, a base of the second switch tube is connected with the external single chip microcomputer, the base of the second switch tube is used for receiving the pulse signal, and an emitting electrode of the second switch tube is connected with an emitting electrode of the first switch tube.
The working principle of the PNP transistor and the NPN transistor is the same except that the polarities of the power supplies, and the NPN transistor is described as an example below:
for an NPN type triode, the NPN type triode is formed by clamping a P type semiconductor between two N type semiconductors, a PN junction formed between an emitter region and a base region is called an emitter junction, a PN junction formed between a collector region and the base region is called a collector junction, and three leads are respectively called an emitter electrode e, a base electrode b and a collector electrode c. When the pulse signal is at a high level, the first switch tube is closed, and the second switch tube is opened; when the pulse signal is at a low level, the first switch tube is opened, and the second switch tube is closed. The first switch tube and the second switch tube are opened and closed alternately, so that induced electromotive force is generated between the inductor and the electric quantity storage element.
Optionally, as shown in fig. 10, the electric pressure cooker further includes a first resistor 1002, wherein one end of the first resistor 1002 is connected to the switch circuit 202, and the other end of the first resistor 1002 is connected to an external single chip microcomputer 1004.
Optionally, the magnetic conducting device is a permanent magnet or a magnetic core.
Optionally, the charge storage element is a capacitor.
Optionally, the electric pressure cooker further comprises a valve for stopping opening, and the magnetic conducting device is arranged at the top end of the valve for stopping opening.
In summary, in the electric pressure cooker provided in the embodiment of the present invention, the external single chip inputs the PWM signal to the electric pressure cooker, and controls the first switch tube and the second switch tube to be opened and closed, so that an induced electromotive force is generated between the inductor and the electric quantity storage element, and the voltage at the point a is, for example, 4.5V. When the permanent magnet is close to the inductor, the magnetic flux passing through the inductor is reduced, the induced electromotive force is reduced, the voltage at the point a is reduced to 4V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a first voltage signal to the external single chip microcomputer, the first voltage signal is a low-level voltage signal, the first voltage signal is processed by the external single chip microcomputer and indicates that the pressure container is in an upper-pressure state, and then the external single chip microcomputer can transmit the upper-pressure state to the display device so as to indicate that the pressure container is in the upper-pressure state. When the permanent magnet is far away from the inductor, the magnetic flux of the inductor is increased, the induced electromotive force is increased, the voltage at the point a is increased to 4.5V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a second voltage signal to the external single chip microcomputer, the second voltage signal is a high-level voltage signal, the second voltage signal is processed by the external single chip microcomputer and indicates that the pressure container is in a non-pressure state, and then the external single chip microcomputer can transmit the non-pressure state to the display device to indicate that the pressure container is in the non-pressure state.
The electric pressure cooker of the embodiment of the invention has the following advantages:
1. the coil can be made into any shape, so that the induction surface is large, and the problem of no induction is difficult to occur, so that the induction sensitivity is stable;
2. the device with mechanical contacts is not provided with a reed switch, so that the service life is long;
3. all elements used by the electric pressure cooker provided by the embodiment of the invention are pure electronic elements with low price, and compared with reed pipe elements in the prior art, the cost is lower.
In the embodiment of the invention, an electromagnetic induction mode is adopted, and by arranging the switch circuit and the electromagnetic induction circuit, when the magnetic conduction device is close to the electromagnetic induction circuit, the electromagnetic induction circuit outputs a first voltage signal indicating that the pressure container is in a pressure-up state, and when the magnetic conduction device is far away from the electromagnetic induction circuit, the electromagnetic induction circuit outputs a second voltage signal indicating that the pressure container is in a pressure-free state.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
According to an embodiment of the present invention, there is also provided an electric pressure cooker, including:
the electric pressure cooker comprises a valve for stopping opening, a permanent magnet arranged at the top end of the valve for stopping opening, and the electric pressure cooker with any characteristics arranged above the permanent magnet.
According to the electric pressure cooker provided by the embodiment of the invention, the external singlechip of the electric pressure cooker inputs PWM signals to the electric pressure cooker, and controls the disconnection and the connection of the first switch tube and the second switch tube, so that induced electromotive force is generated between the inductor and the electric quantity storage element, and the voltage at the point a is 4.5V, for example. When the permanent magnet at the top end of the valve for stopping opening is close to the inductor, the magnetic flux passing through the inductor is reduced, the induced electromotive force is reduced, the voltage at the point a is reduced to 4V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a first voltage signal to an external single chip microcomputer, the first voltage signal is a low-level voltage signal, the first voltage signal is processed by the external single chip microcomputer and indicates that the electric pressure cooker is in a pressure-up state, and then the external single chip microcomputer can transmit the pressure-up state to a display device so as to indicate that the electric pressure cooker is in the pressure-up state. When the permanent magnet at the top end of the valve for stopping opening is far away from the inductor, the magnetic flux of the inductor is increased, the induced electromotive force is increased, the voltage at the point a is increased to 4.5V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a second voltage signal to the external single chip microcomputer, the second voltage signal is a high-level voltage signal, the second voltage signal is processed by the external single chip microcomputer and indicates that the electric pressure cooker is in a non-pressure state, and further, the external single chip microcomputer can transmit the non-pressure state to the display device so as to indicate that the electric pressure cooker is in the non-pressure state.
According to the electric pressure cooker disclosed by the embodiment of the invention, as the coil of the electric pressure cooker can be made into any shape, the induction surface is large, and the problem of no induction is difficult to occur, the induction sensitivity is stable; the electric pressure cooker does not use a reed switch which is a device with mechanical contacts, so the service life is longer; all elements used by the electric pressure cooker are cheap pure electronic elements, so that the cost is lower compared with the reed switch elements in the prior art.
In the embodiment of the invention, an electromagnetic induction mode is adopted, and by arranging the switch circuit and the electromagnetic induction circuit, when the permanent magnet is close to the electromagnetic induction circuit, the electromagnetic induction circuit outputs a first voltage signal indicating that the electric pressure cooker is in a pressure-up state, and when the permanent magnet is far away from the electromagnetic induction circuit, the electromagnetic induction circuit outputs a second voltage signal indicating that the electric pressure cooker is in a pressure-free state.
Example 3
According to an embodiment of the present invention, there is also provided a method for detecting an upper pressure of a pressure vessel, including:
the electric pressure cooker receives the pulse signal to generate induced electromotive force;
when the magnetic conduction device is close to the electric pressure cooker, the currently generated induced electromotive force is reduced, and the electric pressure cooker outputs a first voltage signal, wherein the first voltage signal indicates that the pressure container is in an upper pressure state; when the magnetic conduction device is far away from the electric pressure cooker, the currently generated induced electromotive force is increased, and the electric pressure cooker outputs a second voltage signal, wherein the second voltage signal indicates that the pressure container is in a non-pressure state.
According to the method for detecting the upper pressure of the pressure container, provided by the embodiment of the invention, the external single chip microcomputer inputs PWM signals to the electric pressure cooker and controls the first switch tube and the second switch tube to be opened and closed, so that induced electromotive force is generated between the inductor and the electric quantity storage element, and the voltage of a point a is 4.5V, for example. When the permanent magnet is close to the inductor, the magnetic flux passing through the inductor is reduced, the induced electromotive force is reduced, the voltage at the point a is reduced to 4V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a first voltage signal to the external single chip microcomputer, the first voltage signal is a low-level voltage signal, the first voltage signal is processed by the external single chip microcomputer and indicates that the pressure container is in an upper-pressure state, and then the external single chip microcomputer can transmit the upper-pressure state to the display device so as to indicate that the pressure container is in the upper-pressure state. When the permanent magnet is far away from the inductor, the magnetic flux of the inductor is increased, the induced electromotive force is increased, the voltage at the point a is increased to 4.5V, namely after passing through the rectifier diode and the filter capacitor, the electric pressure cooker outputs a second voltage signal to the external single chip microcomputer, the second voltage signal is a high-level voltage signal, the second voltage signal is processed by the external single chip microcomputer and indicates that the pressure container is in a non-pressure state, and then the external single chip microcomputer can transmit the non-pressure state to the display device to indicate that the pressure container is in the non-pressure state.
The method for detecting the upper pressure of the pressure container has the following advantages:
1. the coil can be made into any shape, so that the induction surface is large, and the problem of no induction is difficult to occur, so that the induction sensitivity is stable;
2. the device with mechanical contacts is not provided with a reed switch, so that the service life is long;
3. all elements used by the electric pressure cooker of the pressure container in the embodiment of the invention are pure electronic elements with low price, and compared with reed pipe elements in the prior art, the cost is lower.
In the embodiment of the invention, an electromagnetic induction mode is adopted, and by arranging the switch circuit and the electromagnetic induction circuit, when the magnetic conduction device is close to the electromagnetic induction circuit, the electromagnetic induction circuit outputs a first voltage signal indicating that the pressure container is in a pressure-up state, and when the magnetic conduction device is far away from the electromagnetic induction circuit, the electromagnetic induction circuit outputs a second voltage signal indicating that the pressure container is in a pressure-free state.
Optionally, the specific examples in this embodiment may refer to the examples described in embodiment 1 and embodiment 2, and this embodiment is not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing one or more computer devices (which may be personal computers, servers, network devices, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (14)
1. An electric pressure cooker, characterized in that, includes:
the switch circuit is used for switching on or off according to a pulse signal input by an external singlechip;
the electromagnetic induction circuit is connected with the switching circuit and used for generating induced electromotive force according to the disconnection or the connection of the switching circuit; wherein,
when a magnetic conduction device of the pressure container is close to the electromagnetic induction circuit, the currently generated induced electromotive force is reduced, and the electromagnetic induction circuit outputs a first voltage signal to the external singlechip; when the magnetic conduction device is far away from the electromagnetic induction circuit, the currently generated induced electromotive force is increased, and the electromagnetic induction circuit outputs a second voltage signal to the external single chip microcomputer, wherein the first voltage signal indicates that the pressure container is in a pressure-up state, and the second voltage signal indicates that the pressure container is in a pressure-free state.
2. The electric pressure cooker according to claim 1, wherein the electromagnetic induction circuit comprises an inductor connected to the switching circuit, and a power storage element connected to an output of the inductor.
3. The electric pressure cooker according to claim 2, wherein the electromagnetic induction circuit further comprises a rectification circuit connected with an output end of the inductor, and a filter circuit connected with an output end of the rectification circuit; wherein,
the rectifier circuit is used for converting a first sine wave signal generated by the inductor into a first direct current signal; the filter circuit is used for filtering the first direct current signal to obtain a first voltage signal;
the rectifying circuit is further used for converting a second sine wave signal generated by the inductor into a second direct current signal; the filter circuit is further configured to filter the second direct current signal to obtain the second voltage signal.
4. The electric pressure cooker according to claim 3, wherein the rectification circuit comprises a rectifier diode, wherein the anode of the rectifier diode is connected with the output end of the inductor, and the cathode of the rectifier diode is connected with the input end of the filter circuit.
5. The electric pressure cooker according to claim 3, wherein the filter circuit comprises a filter capacitor, wherein one end of the filter capacitor is connected with the output end of the rectification circuit, and the other end of the filter capacitor is grounded.
6. The electric pressure cooker according to claim 3, wherein the electromagnetic induction circuit further comprises a load resistor, wherein one end of the load resistor is connected with the output end of the rectification circuit, and the other end of the load resistor is grounded.
7. The electric pressure cooker of claim 3, wherein the electromagnetic induction circuitry further comprises:
and the current limiting resistor is arranged between the inductor and the rectifying circuit.
8. The electric pressure cooker according to claim 1, wherein the switching circuit comprises a first switching tube and a second switching tube connected in parallel with each other; wherein,
when the pulse signal is at a high level, the first switch tube is closed, and the second switch tube is opened; when the pulse signal is at a low level, the first switch tube is opened, and the second switch tube is closed.
9. The electric pressure cooker according to claim 8,
the first switching tube is an NPN type triode, wherein a collector of the first switching tube is connected with a working power supply, a base of the first switching tube is connected with an external single chip microcomputer, the base of the first switching tube is used for receiving the pulse signal, and an emitter of the first switching tube is connected with the input end of the electromagnetic induction circuit;
the second switch tube is a PNP type triode, wherein a collector of the second switch tube is grounded, a base of the second switch tube is connected with the external single chip microcomputer, the base of the second switch tube is used for receiving the pulse signal, and an emitting electrode of the second switch tube is connected with an emitting electrode of the first switch tube.
10. The electric pressure cooker according to claim 1, characterized in that the electric pressure cooker further comprises a first resistor, wherein one end of the first resistor is connected with the switch circuit, and the other end of the first resistor is connected with an external singlechip.
11. The electric pressure cooker according to claim 1, wherein the magnetic conducting device is a permanent magnet or a magnetic core.
12. The electric pressure cooker of claim 2, wherein the power storage element is a capacitor.
13. The electric pressure cooker according to claim 1, further comprising a valve for stopping opening, wherein the magnetic conducting device is disposed at the top end of the valve for stopping opening.
14. A method for detecting the upward pressure of a pressure vessel is characterized by comprising the following steps:
the electric pressure cooker receives a pulse signal input by an external singlechip to generate induced electromotive force;
when the magnetic conduction device is close to the electric pressure cooker, the currently generated induced electromotive force is reduced, and the electric pressure cooker outputs a first voltage signal to the external singlechip, wherein the first voltage signal indicates that the pressure container is in an upper pressure state;
when the magnetic conduction device is far away from the electric pressure cooker, the currently generated induced electromotive force is increased, and the electric pressure cooker outputs a second voltage signal to the external singlechip, wherein the second voltage signal indicates that the pressure container is in a non-pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510388668.2A CN104939666B (en) | 2015-06-30 | 2015-06-30 | Upward pressure detection method for pressure container and electric pressure cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510388668.2A CN104939666B (en) | 2015-06-30 | 2015-06-30 | Upward pressure detection method for pressure container and electric pressure cooker |
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| Publication Number | Publication Date |
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| CN104939666A CN104939666A (en) | 2015-09-30 |
| CN104939666B true CN104939666B (en) | 2017-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510388668.2A Active CN104939666B (en) | 2015-06-30 | 2015-06-30 | Upward pressure detection method for pressure container and electric pressure cooker |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018145491A1 (en) * | 2017-02-10 | 2018-08-16 | 佛山市顺德区美的电热电器制造有限公司 | Float valve motion detection device, pot cover assembly and pressure cooking appliance |
| CN108851970B (en) * | 2017-05-12 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Overvoltage protection device of cooking appliance and cooking appliance |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2535598A1 (en) * | 1982-11-08 | 1984-05-11 | Levalois Daniel | Device forming an audible alarm which can be associated with a hermetically closed container equipped with a valve. |
| CH688419C1 (en) * | 1992-09-01 | 1999-09-30 | Heinrich Kuhn Metallwarenfabrik Ag | Safety valve for a vapor pressure cooker. |
| CN201253141Y (en) * | 2008-06-27 | 2009-06-10 | 黄振雄 | Pressure displaying device of electric pressure boiler |
| CN201481060U (en) * | 2009-07-26 | 2010-05-26 | 简广 | Pressure detection control device of electric pressure cooker |
| CN202505018U (en) * | 2012-01-18 | 2012-10-31 | 九阳股份有限公司 | Safety cover-closing electric pressure cooker |
| CN203041841U (en) * | 2012-12-07 | 2013-07-10 | 九阳股份有限公司 | Electric pressure cooker capable of displaying pressure rising in cooker |
| CN203789698U (en) * | 2014-03-20 | 2014-08-27 | 奔腾电器（上海）有限公司 | Device for detecting actions of electric pressure appliance float-controlled valve |
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