Method for detecting cookware through induction cooker and induction cooker

Abstract

The invention relates to the technical field of kitchen and bath electric appliances, and discloses a method for detecting cookware through an induction cooker and the induction cooker. The method for detecting the cookware through the induction cooker comprises the steps that when the cookware is placed on an induction cooker panel, bending waves are generated; an acoustic-electric conversion element arranged on the induction cooker receives the bending waves, converts the bending waves into electric signals and transmits the electric signals to a control processor; and when the control processor receives the electric signal transmitted by the acoustic-electric conversion element, the control processor judges whether the cookware is placed on the panel of the induction cooker. According to the induction cooker, whether the cookware is placed on the panel of the induction cooker or not is detected by detecting the bending waves generated when the cookware is placed on the panel of the induction cooker. The method for detecting the cookware by the induction cooker is not limited by the material of the cookware, and is not influenced by electromagnetic interference and high-temperature radiation of the induction cooker; and the cookware detection parameter error and the cookware detection error rate are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen and bathroom appliances, and particularly relates to a method for an induction cooker to detect cookware and an induction cooker. Background Art

[0002] An induction cooker uses an alternating current passing through a heating coil to generate an alternating magnetic field with a continuously changing direction. When the magnetic field lines of the alternating magnetic field cut a cookware placed on the induction cooker, eddy currents appear at the bottom of the cookware. The eddy currents drive the movement of the charge carriers in the cookware, causing the bottom of the cookware to heat up, thereby achieving the purpose of heating the food in the cookware.

[0003] Some existing induction cookers have the function of detecting cookware. The methods for using an induction cooker to detect cookware generally include: current detection method, pulse number detection method, resonance frequency detection method, etc. The current detection method generally judges whether a cookware is placed on the induction cooker by detecting the magnitude of the current. For the above current detection method for cookware, not only is the error large, but it is also difficult to distinguish the material of the cookware, resulting in a relatively high error rate in detecting cookware. The pulse number detection method generally judges whether a cookware is placed on the induction cooker by detecting the number of pulses. For the above pulse detection method for cookware, although the detection accuracy is relatively high, it is still difficult to distinguish the material of the cookware, resulting in a still relatively high error rate in detecting cookware. The resonance frequency detection method generally judges whether a cookware is placed on the induction cooker by detecting the resonance frequency. For the above resonance frequency detection method for cookware, although the detection accuracy is relatively high, it is still difficult to distinguish the material of the cookware, resulting in a still relatively high error rate in detecting cookware.

[0004] In summary, the existing methods for an induction cooker to detect cookware generally include: a control circuit; because the control circuit is easily affected by the electromagnetic interference and high-temperature radiation of the induction cooker, the detection parameters of the existing cookware detection methods have large errors, it is difficult to distinguish the material of the cookware, and it is difficult to judge whether a cookware is placed on the induction cooker. Summary of the Invention

[0005] In view of this, the present invention provides a method for an induction cooker to detect cookware to solve the problem that the existing methods for an induction cooker to detect cookware generally include: a control circuit; because the control circuit is easily affected by the electromagnetic interference and high-temperature radiation of the induction cooker, the detection parameters of the existing cookware detection methods have large errors, it is difficult to distinguish the material of the cookware, and it is difficult to judge whether a cookware is placed on the induction cooker.

[0006] In a first aspect, the present invention provides a method for an induction cooker to detect cookware, including:

[0007] When a cookware is placed on the panel of the induction cooker, a bending wave is generated;

[0008] The electroacoustic conversion element provided on the induction cooker is adapted to receive the flexural wave, convert it into an electrical signal, and transmit it to the control processor;

[0009] When the control processor receives the electrical signal transmitted by the electroacoustic conversion element, the control processor determines that the cookware is placed on the panel of the induction cooker. Beneficial effects: By adopting the above technical solution, the method for detecting the cookware of the present application detects whether the cookware is placed on the panel of the induction cooker by detecting the flexural wave generated when the cookware is placed on the panel of the induction cooker. The method for detecting the cookware of the induction cooker described in the present application is not limited by the material of the cookware and is not affected by the electromagnetic interference and high-temperature radiation of the induction cooker; the parameter error of cookware detection and the error rate of cookware detection are significantly reduced.

[0010] Optionally, it further includes:

[0011] According to the different times when multiple electroacoustic conversion elements located at different positions transmit electrical signals to the control processor, determine the position of at least one of the cookware on the panel of the induction cooker. Beneficial effects: By adopting the above technical solution, further, due to the different times when the flexural wave signals obtained by the electroacoustic conversion elements located at different positions are transmitted to the control processor, it is further convenient to determine and locate the placement position of the cookware. And, the positions of multiple cookware can be detected simultaneously. As long as the area of the panel of the induction cooker is large enough, there is no limit to the number of cookware detected and located.

[0012] Optionally, the determining the position of at least one of the cookware on the panel of the induction cooker according to the different times when multiple electroacoustic conversion elements transmit electrical signals to the control processor includes:

[0013] The control processor divides the panel of the induction cooker into grids in the X-axis dimension and the Y-axis dimension to form a grid area; the X-axis is perpendicular to the Y-axis; each position on the panel of the induction cooker corresponds to a unique position coordinate in the grid area; each position coordinate uniquely corresponds to a set of time series suitable for being obtained by a set of electroacoustic conversion elements; the time data in the time series are the different times when the corresponding different electroacoustic conversion elements transmit electrical signals to the control processor; each set of time series corresponds to the unique position information of the cookware on the panel of the induction cooker;

[0014] Correspond one by one all the position information of the cookware on the panel of the induction cooker, the time series, and the position coordinates to form a reference database, and store it in the memory;

[0015] When placing a cookware on the panel of an induction cooker, the control processor obtains the position coordinates and the position information of the cookware on the induction cooker panel according to the time series in combination with the reference database. Beneficial effects: By adopting the above technical solution, the present application further divides the panel to form a grid area, which can realize the detection of cookware at any position in the entire area of the panel, and accurately detect and locate the position of the cookware.

[0016] Optionally, it further includes:

[0017] There is at least one heating coil suitable for independent control in the induction cooker, and the heating coil corresponds to the area position on the induction cooker panel; when the induction cooker is started, the heating coil corresponding to the position of the cookware on the induction cooker panel starts to work. Beneficial effects: By adopting the above technical solution, on the basis of accurately detecting and locating the position of the cookware, the present application further achieves accurate control of the corresponding heating coil to heat the cookware, significantly reducing the power consumption.

[0018] Optionally, the number of the heating coils is one, and when the position of the cookware on the induction cooker panel corresponds to the center of the heating coil, the heating coil is started to work. Beneficial effects: By adopting the above technical solution, when the cookware is placed at the central position of the heating coil, the induction cooker performs heating work to achieve the best energy-saving and heating effects.

[0019] Optionally, the number of the heating coils is at least two, and according to the distance between the position of the cookware on the induction cooker panel and different heating coils, the output power of different heating coils after startup is determined. Beneficial effects: By adopting the above technical solution, the heating coil closer to the cookware plays a main heating role, and the heating coil farther from the cookware plays an auxiliary heating role, so as to achieve the best energy-saving and heating effects when the induction cooker performs heating work.

[0020] In the second aspect, the present invention also provides an induction cooker, which applies the method for detecting a cookware by the induction cooker, including:

[0021] A panel;

[0022] An acoustic-electric conversion element is arranged at the bottom and / or side of the panel;

[0023] A control processor, which is signal-connected to the acoustic-electric conversion element;

[0024] The induction cooker is adapted to receive the flexural waves generated when a cookware is placed on the panel of the induction cooker through an acoustic-electric conversion element, convert them into electrical signals, and transmit them to a control processor. When the control processor receives the electrical signals transmitted by the acoustic-electric conversion element, the control processor determines that the cookware is placed on the panel of the induction cooker. Beneficial effects: By adopting the above technical solution, the present application detects the flexural waves generated when the cookware is placed on the panel of the induction cooker through the acoustic-electric conversion element to detect whether a cookware is placed on the panel of the induction cooker. The induction cooker described in the present application is not restricted by the material of the cookware when detecting the cookware, and is not affected by the electromagnetic interference and high-temperature radiation of the induction cooker; it significantly reduces the parameter error of cookware detection and the error rate of cookware detection.

[0025] Optionally, it further includes:

[0026] A memory, which is signal-connected to the control processor; the memory is adapted to store a reference database; the control processor divides the panel of the induction cooker into segments in the X-axis dimension and the Y-axis dimension according to regions, forming a grid-like region; the X-axis is perpendicular to the Y-axis; each position on the panel of the induction cooker respectively corresponds to a unique position coordinate in the grid-like region; each position coordinate respectively corresponds uniquely to a set of time series that an acoustic-electric conversion element is adapted to obtain; the time data in the time series are different times corresponding to different acoustic-electric conversion elements transmitting electrical signals to the control processor; each set of time series respectively corresponds to the unique position information of the cookware on the panel of the induction cooker; the position information of the cookware at all positions on the panel of the induction cooker, the time series, and the position coordinates are put into one-to-one correspondence to form the reference database;

[0027] When the induction cooker is further adapted to place the cookware on the panel of the induction cooker, the control processor obtains the position coordinates and the position information of the cookware on the panel of the induction cooker according to the time series in combination with the reference database. Beneficial effects: By adopting the above technical solution, the present application further divides the panel to form a grid-like region, and the control processor combines the reference database in the memory, etc., so as to realize the detection of cookware at any position in the entire region of the panel, and accurately detect and locate the position of the cookware.

[0028] Optionally, it further includes:

[0029] At least one independently controllable heating coil, which is arranged under the panel of the induction cooker;

[0030] A power driving board, which is signal-connected to the heating coil and the control processor; the power driving board is adapted to start the corresponding heating coil for heating under the control of the control processor, and respectively control the output power of the started heating coil. Beneficial effects: By adopting the above technical solution, in combination with the control processor and the power driving board, etc., it is convenient to control the output power of different heating coils to achieve the best energy-saving and heating effects.

[0031] Optionally, the acoustic-electric conversion element is a piezoelectric sensor; a band-pass filter, a signal amplification circuit, and an analog-to-digital conversion unit are provided between the piezoelectric sensor and the control processor; the piezoelectric sensor is connected to the band-pass filter, the band-pass filter is connected to the signal amplification circuit, the signal amplification circuit is connected to the analog-to-digital conversion unit, and the analog-to-digital conversion unit is connected to the control processor. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Side-sectional schematic of the propagation of bending waves on the induction cooker in the method for the induction cooker to detect cookware provided in the embodiment of the present invention Figure One ;

[0034] Figure 2 Side-sectional schematic of the propagation of bending waves on the induction cooker in the method for the induction cooker to detect cookware provided in the embodiment of the present invention Figure Two ;

[0035] Figure 3 Schematic diagram of the arrangement of the piezoelectric sensor at the bottom of the panel provided in the embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the arrangement of the piezoelectric sensor on the side of the panel provided in the embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the grid area of the panel provided in the embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the placement of the cookware when there is one heating coil in the induction cooker provided in the embodiment of the present invention;

[0039] Figure 7 Schematic diagram of the placement of the cookware when there are fifteen heating coils in the induction cooker provided in the embodiment of the present invention;

[0040] Figure 8 Schematic block diagram of the connection of some components of the induction cooker provided in the embodiment of the present invention.

[0041] Description of the Reference Numerals:

[0042] 1. Panel; 2. Cookware; 3. Piezoelectric sensor; 4. Bending wave; 5. Heating coil. Detailed implementation mode

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] For existing induction cookers, generally only some parts of the panel are provided with heating areas, and heating coils are only arranged in the heating areas. Since the existing methods for detecting cookware are difficult to detect tiny iron materials, when the cookware is too far away from the heating coil, it is equivalent to detecting tiny iron materials, resulting in difficulty in determining whether the cookware is placed on the induction cooker. For existing induction cookers with multiple heating areas, the cookware at the junction of the heating areas is also equivalent to detecting tiny iron materials, resulting in difficulty in determining whether the cookware is placed on the induction cooker. For the above reasons, this application proposes a method for detecting cookware by an induction cooker and an induction cooker.

[0045] Reference Figures 1 to 8 A specific implementation mode of the method for detecting cookware by an induction cooker shown in the figure includes the following steps:

[0046] S1. When the cookware 2 is placed on the panel 1 of the induction cooker, a bending wave 4 is generated, as shown in Figure 1 and Figure 2 shown in the figure.

[0047] S2. The electro-acoustic conversion element provided on the induction cooker is adapted to receive the bending wave 4, convert it into an electrical signal, and transmit it to the control processor. Specifically, the electro-acoustic conversion element can be a piezoelectric sensor 3. The bending wave 4 can also be called a bending sound wave, as shown in Figure 1 and Figure 2 shown in the figure.

[0048] S3. When the control processor receives the electrical signal transmitted by the electro-acoustic conversion element, the control processor determines that the cookware 2 is placed on the panel 1 of the induction cooker; when the control processor does not receive the electrical signal transmitted by the electro-acoustic conversion element, the control processor determines that the cookware 2 is not placed on the panel 1 of the induction cooker.

[0049] As shown in Figure 1 and Figure 2 shown in the figure, the panel 1 of the induction cooker can be square. Figure 1 and Figure 2They respectively show the schematic propagation of the bending wave 4 on two mutually perpendicular cross-sections. The method for the induction cooker of the present application to detect cookware is to detect whether there is a cookware 2 placed on the induction cooker panel 1 in a simple sound recognition manner. The principle is that when the cookware 2 contacts any position on the panel 1, a unique sound will be generated. By detecting the above unique sound, it is judged whether the cookware 2 is placed on the panel 1. After the cookware 2 is placed on the panel 1, the panel 1 will have a certain degree of bending deformation, and the above bending deformation will emit a unique sound. The unique sound will spread to the surroundings of the panel 1. The piezoelectric sensors 3 arranged around the panel 1, after receiving the bending wave 4, convert the sound signal of the bending wave 4 into an electrical signal and input it into the control processor. When the control processor receives the electrical signal transmitted by the piezoelectric sensor 3, the control processor judges that the cookware 2 is placed on the panel 1 of the induction cooker.

[0050] Further, the method for the induction cooker of the present application to detect cookware further includes:

[0051] S4. Determine the position of at least one of the cookware 2 on the induction cooker panel 1 according to the different times when the electro-acoustic conversion elements located at different positions transmit electrical signals to the control processor.

[0052] As Figure 1 and Figure 2 shown, the method for the induction cooker of the present application to detect the position of the cookware 2 placed on the panel 1 further uses the sound recognition method. The principle is to locate the position of the cookware 2 placed on the panel 1 by detecting the above unique sound. After the cookware 2 is placed on the panel 1, the panel 1 will have a certain degree of bending deformation, and the above bending deformation will emit a unique sound. The unique sound will spread to the surroundings of the panel 1. The piezoelectric sensors 3 arranged around the panel 1, after receiving the bending wave 4, convert the sound signal of the bending wave 4 into an electrical signal and input it into the control processor. The control processor determines the specific position of the cookware 2 on the panel 1 by comparing the times when the electrical signals of, for example, four piezoelectric sensors 3 located at different positions are input into the control processor.

[0053] Specifically, the above step S4 specifically includes the following steps:

[0054] S41. The control processor divides the induction cooker panel 1 in the X-axis dimension and the Y-axis dimension according to regions to form a grid-like region; the X-axis is perpendicular to the Y-axis; each position on the induction cooker panel 1 respectively corresponds to a unique position coordinate in the grid-like region; each position coordinate respectively corresponds uniquely to a set of time series suitable for being obtained by a set of electro-acoustic conversion elements; the time data in the time series are the different times when the electrical signals are transmitted by different electro-acoustic conversion elements to the control processor; each set of time series respectively corresponds to the unique position information of the cookware 2 on the induction cooker panel 1. As Figure 5As shown, on the grid area of the panel 1, 9*16 coordinates are formed, corresponding to the X-axis horizontally and the Y-axis vertically. The sizes of the X-axis and the Y-axis can be divided in units of 1 millimeter. Combining Figure 3 , Figure 4 and Figure 5 shown, after the cookware 2 is placed on the panel 1 of the induction cooker, the piezoelectric sensor 3 at the position of the horizontal number "1" and the vertical number "1" in the upper left corner of the panel 1 is the closest to the cookware 2; therefore, the bending wave 4 at the above position is received by the piezoelectric sensor 3 in the shortest time, and the receiving times of the other three piezoelectric sensors 3 are relatively long.

[0055] S42. One-to-one correspondence of all position information of the cookware 2 on the induction cooker panel 1, the time series, and the position coordinates is formed to establish a reference database and stored in the memory. Specifically, when calibrating the position of the cookware 2 with coordinates, place the cookware 2 at the position of the horizontal number "1" and the vertical number "1", and by comparing the lengths of the times when the four piezoelectric sensors 3 receive the bending wave 4, determine the position coordinates of the horizontal number "1" and the vertical number "1", and save the position data of the horizontal number "1" and the vertical number "1", the corresponding times when the four piezoelectric sensors 3 receive the bending wave 4, and the position information of the corresponding cookware 2 in the memory; the remaining digital coordinate positions are calibrated in the same way as above to form a reference database, referring to Figure 5 shown.

[0056] S43. When the cookware 2 is placed on the panel 1 of the induction cooker, the control processor obtains the position coordinates and the position information of the cookware 2 on the induction cooker panel according to the time series and in combination with the reference database. Specifically, for example, as Figure 5 shown, when the cookware 2 is placed at the position of the horizontal number "3" and the vertical number "3", the piezoelectric sensor 3 detects the bending wave 4, and the control processor compares the obtained time series with the reference database inside the memory to determine that the cookware 2 is placed at the position of the horizontal number "3" and the vertical number "3". Through the above solution, the position of the cookware 2 can be accurately detected and positioned.

[0057] Furthermore, the method for the induction cooker of the present application to detect the cookware further includes:

[0058] S5. There is at least one heating coil 5 provided in the induction cooker, which is suitable for independent control. The heating coil 5 corresponds to the area position on the induction cooker panel 1. When the induction cooker is started, the heating coil 5 corresponding to the position of the cookware 2 on the induction cooker panel 1 starts to work. The heating coil 5 is also called an electromagnetic wire coil or a heating wire coil. For example, when the cookware 2 is placed at the position of the horizontal number "3" and the vertical number "3", after determining that the cookware 2 is placed at the position of the horizontal number "3" and the vertical number "3", the control processor can send an instruction to the heating coil 5 at the position of the horizontal number "3" and the vertical number "3" to work and heat the cookware 2. The heating coils 5 at the remaining coordinate positions may not work. Through the above solution, on the basis of accurately detecting and positioning the position of the cookware 2, the corresponding heating coil 5 can be further accurately controlled to heat the cookware 2.

[0059] Specifically, when the number of the heating coils 5 is one, and when the position of the cookware 2 on the induction cooker panel 1 corresponds to the center of the heating coil 5, the heating coil 5 is started to work. The induction cooker with one heating coil is also called a single-head induction cooker. As Figure 6 shown, the heating coil 5 occupies the areas of 2*5 to 2*7, 3*5 to 3*9, 4*6 to 4*10, 5*6 to 5*11, 6*7 to 6*11, 7*8 to 7*12, 8*9 to 8*12, and 9*11 to 9*12 that extend horizontally on the panel 1. The control processor compares the position of the cookware 2 with the areas occupied by the above heating coils 5. When the control processor determines that the cookware 2 is just placed at the central position of the heating coil 5, the control processor can send an instruction to the power drive board to drive the heating coil 5 to work and heat. When the position where the cookware 2 is placed is not at the central position of the heating coil 5, the control processor does not send a working instruction to the power drive board, and the induction cooker will not work, so as to achieve the best energy-saving and heating effects.

[0060] Specifically, when the number of the heating coils 5 is at least two, according to the distance between the position of the cookware 2 on the induction cooker panel 1 and different heating coils 5, the output power of different heating coils 5 after startup is determined. Generally, the heating coil 5 closer to the position of the cookware 2 has the largest output power, and the heating coil 5 farther from the position of the cookware 2 has the smallest output power. The induction cooker with more than two heating coils 5 is also called a multi-head induction cooker. As Figure 7As shown in the figure, on the panel 1 of the induction cooker, three rows and five columns of heating coils 5 with the same size are evenly arranged. The cookware 2 is basically located in the area between the diagonal of the first heating coil 5 in the second row and the second heating coil 5 in the third row. Then, the heating output power allocated to the first heating coil 5 in the second row and the second heating coil 5 in the third row is relatively large, and the output power of the first heating coil 5 in the third row and the second heating coil 5 in the second row is relatively small.

[0061] Figures 1 to 8 A specific implementation manner of the induction cooker shown in the figure includes a panel 1, a sound-electricity conversion element, and a control processor. Specifically, the sound-electricity conversion element is a piezoelectric sensor 3. The panel 1 can be square.

[0062] The sound-electricity conversion element is arranged at the bottom and / or side of the panel 1. For example, as Figure 3 shown, four piezoelectric sensors 3 are arranged at the bottom of the panel 1, and the four piezoelectric sensors 3 are respectively arranged near the four top corners. As Figure 4 shown, four piezoelectric sensors 3 are arranged on the side of the panel 1, and the four piezoelectric sensors 3 are respectively located on different sides. In Figure 3 and Figure 4 the arrows indicate the diffusion direction of the flexural wave 4.

[0063] The control processor is signal-connected to the sound-electricity conversion element, as Figure 8 shown. The induction cooker is adapted to receive the flexural wave generated when the cookware 2 is placed on the panel 1 of the induction cooker through the sound-electricity conversion element, convert it into an electric signal, and transmit it to the control processor. When the control processor receives the electric signal transmitted by the sound-electricity conversion element, the control processor determines that the cookware 2 is placed on the panel of the induction cooker, as Figure 1 and Figure 2 shown.

[0064] Furthermore, the induction cooker of the present application further includes: a memory. The memory is signal-connected to the control processor, as Figure 8As shown; the memory is adapted to store a reference database; the control processor divides the panel 1 of the induction cooker into X-axis dimension segments and Y-axis dimension segments according to regions, forming a grid-like region; the X-axis is perpendicular to the Y-axis; each position on the panel 1 of the induction cooker respectively corresponds to a unique position coordinate in the grid-like region; each position coordinate respectively corresponds uniquely to a set of time series that a set of acoustic-electric conversion elements is adapted to obtain; the time data in the time series are different times corresponding to different acoustic-electric conversion elements transmitting electrical signals to the control processor; each set of time series respectively corresponds to the unique position information of the cookware 2 on the induction cooker panel 1; the position information of the cookware 2 at all positions on the induction cooker panel 1, the time series, and the position coordinates are put into one-to-one correspondence to form the reference database. The induction cooker is further adapted to, when the cookware 2 is placed on the panel 1 of the induction cooker, the control processor obtains the position coordinates and the position information of the cookware 2 on the induction cooker panel 1 according to the time series in combination with the reference database, as Figure 5 shown.

[0065] Further, the induction cooker described in the present application further includes: at least one heating coil 5 adapted to be independently controlled and a power driving board. The heating coil 5 is arranged below the panel 1 of the induction cooker. The power driving board is in signal connection with the heating coil 5 and the control processor, as Figure 8 shown; the power driving board is adapted to start the corresponding heating coil 5 for heating under the control of the control processor and respectively control the output power of the started heating coil 5, as Figure 6 and Figure 7 shown. As Figure 8 shown, the AC 220V power supply is rectified by a rectifier to output a DC 5V voltage to supply power to the control processor.

[0066] Further, a band-pass filter, a signal amplification circuit, and an analog-to-digital conversion unit are provided between the piezoelectric sensor 3 and the control processor; the piezoelectric sensor 3 is connected to the band-pass filter, the band-pass filter is connected to the signal amplification circuit, the signal amplification circuit is connected to the analog-to-digital conversion unit, and the analog-to-digital conversion unit is connected to the control processor. The band-pass filter is a high-gain low-noise band-pass filter for filtering out interference clutter signals; the signal amplification circuit is a high-gain micro-signal amplification circuit; the analog-to-digital conversion unit is a high-speed signal acquisition unit.

[0067] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for an induction cooker to detect cookware, characterized in that, Comprising: When the cookware (2) is placed on the panel (1) of the induction cooker, a bending wave (4) is generated; The electro-acoustic conversion element provided on the induction cooker is adapted to receive the bending wave (4), convert it into an electrical signal, and transmit it to the control processor; When the control processor receives the electrical signal transmitted by the electro-acoustic conversion element, the control processor determines that the cookware (2) is placed on the panel (1) of the induction cooker.

2. The method for an induction cooker to detect cookware according to claim 1, wherein, Further comprising: According to the different times when a plurality of electro-acoustic conversion elements located at different positions transmit electrical signals to the control processor, determine the position of at least one cookware (2) on the induction cooker panel (1).

3. The method for detecting cookware of an induction cooker according to claim 2, wherein, The determining the position of at least one cookware (2) on the induction cooker panel (1) according to the different times when a plurality of electro-acoustic conversion elements transmit to the control processor includes: The control processor divides the panel (1) of the induction cooker into X-axis size segments and Y-axis size segments according to regions, forming a grid-like region; the X-axis is perpendicular to the Y-axis; each position on the panel (1) of the induction cooker respectively corresponds to a unique position coordinate in the grid-like region; each position coordinate respectively corresponds uniquely to a set of time series that a set of electro-acoustic conversion elements is adapted to obtain; the time data in the time series is the different times when different electro-acoustic conversion elements transmit electrical signals to the control processor; each set of time series respectively corresponds to the unique position information of the cookware (2) on the induction cooker panel (1); One-to-one correspondence of all the position information of the cookware (2) on the induction cooker panel (1), the time series, and the position coordinates is formed into a reference database and stored in the memory; When the cookware (2) is placed on the panel (1) of the induction cooker, the control processor obtains the position coordinates and the position information of the cookware (2) on the induction cooker panel in combination with the reference database according to the time series.

4. The method for detecting cookware of an induction cooker according to claim 2, characterized in that, Further comprising: At least one heating coil (5) adapted to be independently controlled is provided in the induction cooker, and the heating coil (5) corresponds to the regional position on the induction cooker panel (1); when the induction cooker is started, the heating coil (5) corresponding to the position of the cookware (2) on the induction cooker panel (1) starts to work.

5. The method for an induction cooker to detect cookware according to claim 4, characterized in that, The number of the heating coils (5) is one. When the position of the cookware (2) on the induction cooker panel (1) corresponds to the center of the heating coil (5), the heating coil (5) is started to work.

6. The method for detecting cookware of an induction cooker according to claim 4, characterized in that, The number of the heating coils (5) is at least two. According to the distance of the position of the cookware (2) on the induction cooker panel (1) from different heating coils (5), determine the magnitude of the output power of different heating coils (5) after starting.

7. An induction cooker that applies the method for detecting cookware of the induction cooker according to any one of claims 1-6, characterized in that, Comprising: Panel (1); Electro-acoustic conversion element, provided at the bottom and / or side of the panel (1); Control processor, signal-connected to the electro-acoustic conversion element; The induction cooker is adapted to receive the bending wave generated when the cookware (2) is placed on the panel (1) of the induction cooker through the electro-acoustic conversion element, convert it into an electrical signal, and transmit it to the control processor. When the control processor receives the electrical signal transmitted by the electro-acoustic conversion element, the control processor determines that the cookware (2) is placed on the panel of the induction cooker.

8. The electromagnetic cooker according to claim 7, characterized in that, Further comprising: A memory, which is signal - connected to the control processor; the memory is adapted to store a reference database; The control processor divides the panel (1) of the induction cooker along the X - axis dimension and the Y - axis dimension by region, forming a grid - like region; the X - axis is perpendicular to the Y - axis; each position on the panel (1) of the induction cooker respectively corresponds to a unique position coordinate in the grid - like region; each position coordinate respectively and uniquely corresponds to a set of time series that a set of acoustic - electric conversion elements is adapted to obtain; the time data in the time series is the different times when different acoustic - electric conversion elements transmit electrical signals to the control processor; each set of time series respectively corresponds to the unique position information of the cookware (2) on the induction cooker panel (1); one - to - one correspondence is established among all the position information of the cookware (2) on the induction cooker panel (1), the time series, and the position coordinates to form the reference database; When the induction cooker is also adapted to place the cookware (2) on the panel (1) of the induction cooker, the control processor obtains the position coordinates and the position information of the cookware (2) on the induction cooker panel (1) according to the time series in combination with the reference database.

9. The induction cooker according to claim 8, characterized in that, It further includes: At least one independently - controllable heating coil (5), which is arranged below the panel (1) of the induction cooker; A power driving board, which is signal - connected to both the heating coil (5) and the control processor; the power driving board is adapted to start the corresponding heating coil (5) for heating under the control of the control processor and respectively control the output power of the started heating coil (5).

10. The induction cooker according to any one of claims 7-9, characterized in that, The acoustic - electric conversion element is a piezoelectric sensor (3); a band - pass filter, a signal amplification circuit, and an analog - to - digital conversion unit are provided between the piezoelectric sensor (3) and the control processor; the piezoelectric sensor (3) is connected to the band - pass filter, the band - pass filter is connected to the signal amplification circuit, the signal amplification circuit is connected to the analog - to - digital conversion unit, and the analog - to - digital conversion unit is connected to the control processor.

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