Induction heating pot

Abstract

Disclosed herein are induction pots for cooking food products, such as cooking corn kernels to make popcorn, and associated systems and methods. In some embodiments, an induction pot may include (i) a pot bottom, (ii) an induction assembly including an induction coil, and (iii) a spacer coupling the pot bottom to the induction assembly. A power supply may supply power to the induction coil to inductively heat the pan bottom. During heating, the spacer may maintain a fixed separation distance between the pot bottom and the induction assembly as the pot bottom flexes (e.g., in a disc shape upward or downward) due to thermal expansion. For example, the spacer may compress and flex the induction assembly to flex the induction coil to match flexure of the pot bottom.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 517,514, filed August 3, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure generally relates to apparatus and methods for induction heating of a pot to heat and cook food products (such as corn kernels for making popcorn). Background Technology

[0004] A typical setup for making popcorn usually consists of a popcorn pot with a thick steel bottom and a heating element bolted to the bottom. After the bottom of the pot is heated to about 350 degrees Fahrenheit, a batch of kernels and oil is added. The thermostat turns on the heating element, raising the temperature of the bottom of the pot to about 450 degrees Fahrenheit over about 3 minutes. During this heating period, the starch in the kernels cooks and gelatinizes, and the internal pressure rises as the moisture inside the kernels turns into steam. When the internal pressure reaches about 130 pounds per square inch (psi), the husk (outer shell) of the kernel bursts and the steam expands, then cools as the kernel pops, and the internal pressure drops to atmospheric pressure. The soft, gelatinized cells stretch and cool into the foamy structure commonly associated with popcorn. The popcorn is then poured out of the pot, and the bottom of the pot cools back to about 350 degrees Fahrenheit, at which point another batch of kernels and oil can be added. Attached Figure Description

[0005] Many aspects of this disclosure can be better understood with reference to the following figures. The components in the figures are not necessarily to scale. Rather, the focus is on clearly illustrating the principles of this disclosure.

[0006] Figure 1 This is a perspective view of an induction popcorn pot configured according to an implementation scheme of this technology.

[0007] Figure 2A and Figure 2B It is based on the implementation scheme of this technology. Figure 1 Side view of the induction popcorn pot.

[0008] Figures 3A to 3C It is based on the implementation scheme of this technology. Figure 1 A top view of different parts of an induction popcorn pot.

[0009] Figure 4 This is a flowchart illustrating a method for operating an induction popcorn pot according to an embodiment of the present technology. Detailed Implementation

[0010] This technology generally relates to apparatus and methods for heating and cooking food products, such as corn kernels for making popcorn. In a conventional induction popcorn pot, the pot bottom and the induction coil are provided with an initial fixed separation distance, and the corn kernels are heated and popped on the pot bottom. Specifically, the separation distance between the pot bottom and the induction coil is selected to optimize induction heating. However, as the pot heats up, the pot bottom may warp due to thermal expansion (e.g., becoming disc-shaped downwards or upwards), while the induction coil remains fixed in place, thus changing the separation distance between the pot bottom and the induction coil. The permissible range of the optimal separation distance for induction heating may be narrow, so excessive warping of the pot bottom may cause the separation distance to exceed the range of optimal induction heating. For example, if the separation distance becomes too small, the pot may generate excessive resistance heating via the induction coil, causing the corn kernels on the pot bottom to cook too quickly or burn.

[0011] Implementations of this technology can solve this problem. In some implementations, for example, an induction popcorn pot may include (i) a pot bottom, (ii) an induction assembly including an induction coil, and (iii) a spacer coupling the pot bottom to the induction assembly. A power supply may supply power to the induction coil to inductively heat the pot bottom. During heating, the spacer may maintain a fixed separation distance between the pot bottom and the induction assembly as the pot bottom flexes due to thermal expansion (e.g., into a disc shape, upward or downward). For example, the spacer may press against the induction assembly and cause the induction assembly to flex, thereby causing the induction coil to flex, matching the flexing of the pot bottom. Maintaining a fixed or at least substantially fixed separation distance between the induction coil and the pot bottom in the manner described above during induction heating ensures that the pot bottom is heated to the desired temperature and allows for more precise control of the induction parameters.

[0012] The following description and Figures 1 to 4 Certain details are set forth in this disclosure to provide a thorough understanding of various embodiments of the present technology. In other instances, well-known structures, materials, operations, and / or systems typically associated with popcorn pots, motors, drive systems, induction heating components, and parts are not shown or described in detail in the following disclosure, to avoid unnecessarily obscuring the description of various embodiments of the present technology. However, those skilled in the art will recognize that the present technology can be practiced without one or more of the details set forth herein, or using other structures, methods, components, etc.

[0013] The terms used below are to be interpreted in their broadest and most reasonable manner, even when used in conjunction with a detailed description of certain examples of embodiments of the present technology. In fact, some terms may even be emphasized below; however, any term intended to be interpreted in any limiting manner will also be clearly and specifically defined in this Detailed Description section.

[0014] The accompanying drawings illustrate embodiments of the present invention and are not intended to limit its scope. The various depicted elements are not necessarily drawn to scale, and may be arbitrarily enlarged for improved readability. Component details may be abstracted from the drawings to exclude details such as component locations and precise connections between such components when they are unnecessary for a full understanding of how to manufacture and use the invention. Many details, dimensions, angles, and other features shown in the drawings are merely illustrative of specific embodiments of this disclosure. Therefore, other embodiments may have other details, dimensions, angles, and features without departing from the spirit or scope of the invention. Furthermore, those skilled in the art will understand that further embodiments of the invention can be practiced without the following details.

[0015] In the figures, the same reference numerals identify the same or at least replace similar elements. For ease of discussion of any particular element, one or more of the most significant digits of any reference numeral refer to the figure in which that element is first introduced. For example, element... 1 10 is the first time for reference. Figure 1 It is for introduction and discussion.

[0016] Figure 1 This is a perspective view of an induction popcorn pot 100 (“pot 100”) configured according to an embodiment of the present technology. In the illustrated embodiment, the pot 100 includes a pot wall 110 and a pot bottom 120 fixed within / to the pot wall 110. The pot wall 110 and the pot bottom 120 may together define a container 121 for receiving food products (such as corn kernels) therein. The pot 100 may further include a stirring assembly 122 disposed within the container 121 above / on the pot bottom 120. The stirring assembly 122 may include: a hub 124 disposed at or near the central portion of the pot bottom 120 and positioned above the central portion of the pot bottom 120; and a plurality of stirring blades 126 coupled to the hub 124 via, for example, one or more fasteners 125. In some embodiments, the hub 124 may include a protrusion, for example, a cylindrical boss, extending downward from a lower portion of the hub and rotatably received in a corresponding circular opening in the central portion of the pot bottom 120. Hub 124 can be operably coupled to the motor via a drive shaft. Figure 1(A motor and drive shaft are not shown in the diagram) This drive shaft rotates the hub 124 and the attached stirring blades 126 within the container 121 to, for example, stir food products in the container. For example, in some embodiments, the upper portion of the hub 124 may include a feature (e.g., a crosspin) that releasably engages the lower portion of the drive shaft extending downward from the motor positioned above the bottom of the pot 120. In the illustrated embodiment, four stirring blades 126 are present, and each of the stirring blades 126 has an elongated shape extending generally radially from the hub 124 toward the pot wall 110. In other embodiments, fewer or more stirring blades 126 may be present, and / or the stirring blades 126 may have different shapes and sizes.

[0017] See below for reference Figures 2A to 4 In more detail, the pot 100 includes an induction assembly below the pot bottom 120, configured to inductively heat the pot bottom 120 to heat and cook food products received in a container 121 on / above the pot bottom 120. Therefore, the pot bottom 120 can be made of a conductive material suitable for induction heating, such as steel, stainless steel, carbon steel, cast iron, brass, aluminum, copper, etc. A stirring blade 126 can rotate during heating to agitate the food products, thereby achieving more uniform heating and cooking. In some embodiments, a lid or other cover (not shown) can be placed above the container 121 (e.g., coupled to the upper portion of the pot wall 110) to maintain the food products therein and / or retain the heat therein. In some aspects of this technology, the pot 100 may be relatively large, and / or the bottom 120 of the pot may reach very high temperatures (e.g., 300–500 degrees Fahrenheit) during and / or after an induction heating cycle, making it possible to require a handle or other tool to lift the pot 100 and pour out the prepared food product (e.g., popcorn). The pot wall 110 may include wall openings 112 for receiving such handles or tools.

[0018] Figure 2A It is based on the implementation scheme of this technology. Figure 1A side view of an induction popcorn pot 100, wherein the pot wall 110 is omitted for clarity. In the illustrated embodiment, the pot 100 includes an induction assembly 235 located below the pot bottom 120 and having an induction wall 230 and an induction base 240. The induction wall 230 and the induction base 240 may be made of metal (e.g., aluminum), ceramic, and / or other suitable rigid and / or heat-resistant materials. The induction assembly 235 may be secured to the pot bottom 120. For example, in the illustrated embodiment, the induction assembly 235 is clamped to the bottom surface 220 of the pot bottom 120 via a clamp 244. The clamp 244 may be spaced around the periphery of the pot 100 and may be securely mounted to corresponding rods or studs 243 on the bottom surface 220 of the pot bottom 120. The clamp 244 may extend at least partially below the induction base 240 to support the induction assembly 235 and may be tightened (e.g., via bolt 245) against the pot bottom 120 to clamp and secure the induction assembly 235. In some embodiments, the induction wall 230 is annular and does not include a top portion or lid, such that when the induction assembly 235 is clamped to the pot bottom 120, the pot bottom 120, the induction wall 230, and the induction base 240 define an enclosed space 232. Figure 2B ).

[0019] In the illustrated embodiment, the pot 100 further includes a pot base 250 disposed below the induction base 240. A pot bottom 120 may be coupled to the pot base 250 and supported by a plurality of bottom support posts 228 extending between the periphery of the pot bottom 120 and the pot base 250. In some embodiments, the induction base 240 is coupled to and supported by a plurality of induction support posts 242 extending between the induction base 240 and the pot base 250. The induction support posts 242 may support the induction base 240 at a location radially outward from the center of the induction base 240, thereby allowing the center of the induction base 240 to move or flex (e.g., downward), as discussed in further detail below. The pot 100 may further include one or more lifting structures 280, each having an aperture 282 configured to receive a handle or tool for lifting and tilting the pot 100, as referenced above. Figure 1 As described above. In some embodiments, orifice 282 and... Figure 1 The wall opening 112 shown is aligned. In the illustrated embodiment, a gap exists between the sensing base 240 and the lifting structure 280 to allow the sensing base 240 to flex downwards.

[0020] Figure 2BThis is a side view of an induction popcorn pot 100 according to an embodiment of the present technology, wherein the sensing wall 230 of the sensing assembly 235 is omitted for clarity. In the illustrated embodiment, the sensing assembly 235 includes an induction coil 260 disposed below the pot bottom 120 within an enclosed space 232 and a plate 270 disposed below the induction coil 260 within the enclosed space 232, such that the induction coil 260 is positioned above / on the plate 270. In some embodiments, the induction coil 260 includes a flexible coil. In some embodiments, the induction coil 260 may be attached to the plate 270 via adhesives, fasteners, and / or other attachment mechanisms. In other embodiments, the induction coil 260 or multiple induction coil portions (e.g., segments) may be directly (e.g., via adhesive) attached to the bottom surface of the pot bottom 120. For example, multiple individual induction coil portions may be bonded to the bottom surface of the pot bottom 120 and connected in series to a power supply 202 or individually to one or more power supplies. The use of multiple induction coil portions in this configuration allows the induction coil portions to move with the pot bottom 120 as it flexes, thereby maintaining a fixed distance between the pot bottom 120 and the coil portions during pot heating. In other embodiments, a single induction coil may be attached to the pot bottom 120, and its shape and size may be configured such that it flexes with the pot bottom 120 during heating to maintain a desired spatial relationship between the induction coil 260 and the pot bottom 120. Attaching the induction coil or individual induction coil portions to the bottom surface of the pot bottom 120 allows the plate 270 to be omitted. The plate 270 may be a phenolic board made of a dielectric material (e.g., a relatively rigid material such as Bakelite), supported by the induction base 240, providing electrical insulation between the induction coil 260 and the induction base 240.

[0021] In some embodiments, the sensing wall 230 and / or sensing base 240 may be omitted, and the plate 270 may be supported by direct contact with the support post 242 and / or clamp 244. For example, the post 242 and / or clamp 244 may hold or support the plate 270 and the sensing coil 260 on it, instead of clamp 244 clamping the sensing base 240 and sensing wall 230 to the bottom of the pot 120. In some embodiments, studs 243 may each include a shoulder that limits the position (e.g., how high) at which a nut or other fastener and / or clamp 244 may be coupled to the stud 243, thereby defining a minimum separation distance between the bottom of the pot 120 and the clamp 244, and therefore between the plate 270 and the sensing coil 260 on it.

[0022] Spacer 290 is operatively disposed between a central portion 222 of the pot bottom 120 and a central portion 272 of the plate 270. That is, spacer 290 may have an upper portion 291 contacting the bottom surface 220 of the pot bottom 120 and a lower portion 292 contacting the upper surface 271 of the plate 270. As described above, in some embodiments, hub 124 may include a central boss (not shown) extending downward through a central orifice in the pot bottom 120. In some embodiments, a portion of the boss (or a protrusion extending from the boss) may extend downward below the pot bottom 120, and the upper portion 291 of spacer 290 may include a central orifice (also not shown) configured to receive the extended portion of the boss. The engagement created between spacer 290 and the boss extending downward from hub 124 ensures that spacer 290 remains in place (e.g., centered or at least substantially centered) during operation of pot 100.

[0023] In other embodiments, the pot 100 may include additional components and / or features (e.g., fasteners) to ensure that the spacer 290 remains centered or at least substantially centered during pot operation. For example, in some embodiments, the pot 100 may further include one or more insulating materials (e.g., one or more circular insulating material pads, such as aerogel) disposed directly on top of the induction coil 260. In some embodiments, the insulating material may include a central aperture that receives the spacer 290 and thereby centers the spacer within the pot 100. As described in more detail below, the spacer 290 may maintain a fixed distance between the pot bottom 120 and the induction coil 260 during operation of the pot 100 to, for example, provide predictable and consistent induction heating. In some embodiments, the induction coil 260 is operatively coupled to a power supply 202, which may be operatively coupled to a controller 204 wirelessly or via a wired connection.

[0024] Figures 3A to 3C These are top views of an induction popcorn pot 100 according to an embodiment of the present technology, showing different portions or layers of the pot 100. More specifically, Figure 3A This is a top view of the pot 100 with the pot wall 110, pot bottom 120 and stirring assembly 122 removed. Figure 3B It is from Figure 3A The embodiment shown further omits the top view of the pot 100 containing the induction coil 260 and spacer 290. Furthermore, Figure 3C It is from Figure 3B The embodiment shown further removes the top view of the pot 100 of the plate 270.

[0025] refer to Figure 3AThe induction coil 260 can be wound in a spiral pattern on top of the plate 270. In the illustrated embodiment, the induction coil 260 is not completely wound around the center portion 272 of the plate 270, so as to leave space for the lower end portion 292 of the spacer 290 ( Figure 2B The upper surface 271 of plate 270 is contacted near the center portion of plate 270. In some aspects of this technology, covering a large cross-sectional area of ​​pot 100 with induction coil 260 can help to evenly distribute induction heating at the bottom 120 of the pot. Figures 1 to 2B In other embodiments, the induction coil 260 may be positioned on top of the plate 270 in different configurations. (See above regarding...) Figure 2B As discussed, the induction coil 260 can be operatively coupled to a power supply 202 controlled by the controller 204. Although Figure 3A A power supply 202 is schematically shown connected only to one end of the induction coil 260, but those skilled in the art will understand that the power supply 202 may be connected to the other end of the induction coil 260 via, for example, a wire extending between the induction coil 260 and an insulating material on top of the induction coil 260, near the central portion of the plate 270. In some embodiments, the spacer 290 includes one or more notches for allowing the wire to pass through and extend between the induction coil 260 and the power supply 202.

[0026] In some embodiments, plate 270 may be made of a rigid and relatively brittle dielectric material (e.g., Bakelite), which may not be able to bend sufficiently without breaking. Reference Figure 3B , Plate 270 (for illustrative purposes) Figure 3B(Depicted in dotted mode) may include one or more slots, openings, grooves, cuts, punches, apertures, etc., configured to allow plate 270 to buckle during operation of pot 100 despite the relatively hard and brittle nature of the plate material. In the illustrated embodiment, for example, plate 270 includes / defines a plurality of slots 374 extending at least partially radially outward from a central portion 272 of plate 270 toward a peripheral portion 371 of plate 270. In some embodiments, each slot 374 includes: (i) an inner portion 375 along the central portion 272 of the plate and having a first circumferential width; and (ii) an outer portion 376 extending radially away from the inner portion 375 and / or close to the peripheral portion 371 of plate 270 and having a second circumferential width greater than the first width. The slots 374 may be interconnected at a central aperture 377 in the central portion 272 of plate 270. As described above, slot 374 may define a plurality of wedge-shaped portions or wedges 373 of plate 270, which interconnect at and extend inwardly from the peripheral portion 371 of plate 270. The central portion 272 may include the tips of the plurality of wedge-shaped portions 373. In other embodiments, plate 270 may have other arrangements or patterns of slots, cuts, etc., to allow plate 270 to buckle as needed during pot operation. For example, in some embodiments, plate 270 may include a plurality of wedge-shaped portions or wedges interconnected at and extending outwardly from the central portion 272 of plate 270 and not interconnected along the peripheral portion 371 of plate 270. The slot defining such wedges may further help plate 270 buckle sufficiently without breaking. The thickness of plate 270 may also be selected to allow plate 270 to buckle sufficiently without breaking.

[0027] In the illustrated embodiment, the induction coil 260 has a helical or at least generally helical shape. In other embodiments, the induction coil 260 may be arranged on the plate 270 in other shapes. For example, the induction coil 260 may comprise a plurality of coil portions, each located atop one of a wedge in the wedges 373 of the plate 270. Each coil portion may have a wedge shape factor corresponding to each wedge in the wedges 373. The coil portions may be electrically isolated from each other, or connected in series with each other and connected to a power source.

[0028] Furthermore, in the illustrated embodiment, plate 270 may be made of a single piece of material with a monolithic construction. In other embodiments, plate 270 may comprise multiple separate plate portions. For example, in some embodiments, wedges 373 may be individual pieces that are separate from each other and held in place by means of fastening devices, and / or joined together via fasteners, adhesives, and / or other coupling mechanisms. As a non-limiting example, pot 100 may further include a ring having a diameter similar to that of plate 270, and individual wedges may be independently coupled to the ring and extend inward. As another non-limiting example, pot 100 may further include a component at the center of plate 270 that couples the individual wedges together at their tip portions.

[0029] refer to Figure 3A and Figure 3B Spacer 290 ( Figure 3A The slot 374 may be positioned above the central aperture 377 and / or above at least a portion of the inner portion 375 at the central portion 272. In some embodiments, the outer portion 376 does not extend completely through the peripheral portion 371 of the plate 270, such that the plate 270 defines a continuous annular support portion 378 near its periphery. In the illustrated embodiment, the plate 270 includes eight slots 374 symmetrically arranged in a spoke-like pattern. In other embodiments, the plate 270 may include a different number of slots 374, some or all of which may have different shapes, etc.

[0030] In some embodiments, plate 270 further includes / defines a plurality of holes 372 located between some or all of the slots 374 (e.g., between the outer portions 376 of the slots 374). In the illustrated embodiment, each hole 372 has a circular cross-sectional shape and is arranged in a radially symmetrical pattern across plate 270. In other embodiments, holes 372 may have different shapes and / or sizes, and / or plate 270 may have fewer or more holes 372. For example, holes 372 may have various shapes (e.g., square, triangular, oval) and sizes, and be arranged in different patterns (e.g., axisymmetric, asymmetrical). The holes 372 are used to facilitate cooling of one or more components of pot 100 (such as plate 270 and / or induction base 240) by providing a larger surface area for airflow.

[0031] refer to Figure 3CThe induction base 240 may similarly include one or more slots, openings, recesses, cutouts, punches, orifices, etc., configured to allow the induction base 240 to buckle during operation of the pot 100. In the illustrated embodiment, for example, the plate 270 includes / defines a plurality of slots 344 extending at least partially radially outward from the central portion 340 of the induction base 240 toward the peripheral portion 341 of the induction base 240. In some embodiments, the slots 344 may each have a generally constant circumferential width and may converge at a central orifice 345. Reference Figure 3A and Figure 3C Spacer 290 ( Figure 3A It can be positioned at least partially above the central aperture 345. (Reference) Figure 3B and Figure 3C The slot 374 in plate 270 may be closer to the periphery of pot 100 than the slot 344 in sensing base 240 (e.g., it may be shorter). In some embodiments, the slot 344 in sensing base 240 is aligned or substantially aligned with the slot 374 in plate 270.

[0032] Refer again Figure 3C In some embodiments, the induction base 240 further includes / defines a plurality of holes 342 disposed between and / or around the slots 344. In the illustrated embodiment, each hole 342 has a circular cross-sectional shape and is arranged in a radially symmetrical pattern across the induction base 240. In other embodiments, the holes 342 may have different shapes and / or sizes, and / or the induction base 240 may have fewer or more holes 342. For example, the holes 342 may have various shapes (e.g., square, triangular, oval) and sizes, and be arranged in different patterns (e.g., axisymmetric, asymmetrical). The holes 342 are used to facilitate cooling of one or more components of the pot 100 (such as the plate 270 and / or the induction base 240) by providing a larger surface area for airflow. Reference Figure 3B and Figure 3C In some embodiments, when the plate 270 is positioned on top of the sensing base 240, one or more holes in the holes 372 in the plate 270 can be aligned with one or more holes in the holes 342 in the sensing base 240.

[0033] Let's refer to each other. Figures 2A to 3CDuring the operation of the pot 100 in the induction heating cycle, the controller 204 can control the power supply 202 to output power to the induction coil 260. The current flowing into the induction coil 260 can generate an electromagnetic field for induction heating of the pot bottom 120. As the temperature of the pot bottom 120 rises, the pot bottom 120 can expand due to thermal expansion. However, since the peripheral portion of the pot bottom 120 is fixed in place by the bottom support post 228, the central portion of the pot bottom 120 will flex upward or downward (e.g., into a disc shape). In some embodiments, the pot bottom 120 is initially flexed downward into a disc shape before heating (e.g., at room temperature or ambient temperature, e.g., 59℉ - 77℉), such that during the heating of the pot bottom 120, the flexing of the pot bottom 120 predictably occurs in the downward direction. For example, if the central portion of the pot bottom 120 moves downward, the pot bottom 120 can flex downward into a disc shape to align with the dashed line 221 ( Figure 2B Alignment. In other embodiments, the pot bottom 120 is initially oriented upward in a disc shape, such that during heating of the pot bottom 120, deflection of the pot bottom 120 occurs predictably in the upward direction. The maximum initial deflection distance of the pot bottom 120 (e.g., at the center of the pot bottom 120) can be 1 / 16–1 / 4 ​​inch, such as 1 / 8 inch.

[0034] If the induction coil 260 remains fixed in the position shown when the bottom of the pot 120 flexes upwards or downwards, then the separation distance D1 between the induction coil 260 and the bottom of the pot 120 is... Figure 2B The separation distance D1 will change. In some implementations, the separation distance D1 is selected to optimize induction heating, and the range of the optimal separation distance D1 for induction heating may be narrow. Therefore, excessive deflection of the pot bottom 120 may cause the separation distance D1 to exceed the range of optimal induction heating. For example, if the separation distance D1 becomes too small, the pot 100 may experience excessive resistance heating in the induction coil 260, and this may cause the container 121 ( Figure 1 Food products in the product are cooked too quickly or burnt.

[0035] In some aspects of this technology, the spacer 290 is used to maintain the separation distance D1 (e.g., to keep the separation distance D1 constant) when the pot bottom 120 flexes during heating. For example, when the pot bottom 120 expands thermally as shown by line 221 ( Figure 2B When the bottom of the pot 120 flexes downward as shown, the central portion 222 ( Figure 2B The spacer 290 moves downward and pushes downward. Then, the spacer 290 presses against the center portion 272 of the plate 270. The clamp 244 holds the sensor base 240 and the peripheral portion of the plate 270 in place, thus the spacer 290 causes the plate 270 to flex downward, as shown by the dashed line 241. Figure 2BAs shown in the diagram. More specifically, the slots 374 and orifices 377 in plate 270 allow plate 270 to flex / bend downward in response to downward movement of spacer 290. Thus, in some embodiments, plate 270 can flex into a flattened conical shape.

[0036] The central portion 272 of plate 270 presses against the central portion 340 of induction base 240, causing induction base 240 to also flex downwards. Similarly, slots 344 and orifices 345 in induction base 240 allow induction base 240 to flex / bend downwards in response to downward movement of plate 270 and spacer 290. In some embodiments, induction coil 260 positioned on top of plate 270 comprises a flexible coil that can bend or bend with and along the curvature of the upper surface 271 of plate 270, such that the separation distance D1 between pot bottom 120 and induction coil 260 remains constant. In some embodiments, spacer 290 is used to maintain the separation distance D1 between induction coil 260 and pot bottom 120 within a desired range optimal for induction heating (e.g., between approximately 3–10 mm) during induction heating cycles.

[0037] In the illustrated embodiment, the pot bottom 120, induction coil 260, plate 270, and induction base 240 are bent downwards, so the spacer 290 does not need to be coupled to the plate 270 and can simply be pushed downwards. However, if the pot bottom 120 bends upwards during thermal expansion, the spacer 290 can be coupled to the plate 270 to correspondingly lift the plate 270 and induction coil 260 upwards during thermal expansion. In some embodiments, the pot bottom 120 is mounted to the bottom support post 228 in a downwardly bent state (e.g., before induction heating), such that the pot bottom 120 predictably bends downwards rather than upwards during thermal expansion.

[0038] Lines 221 and 241 only indicate the general direction of deflection of the pot bottom 120 and plate 270, and do not indicate the exact curvature, degree of deflection, etc. See below for more information. Figure 4 As will be described in further detail, in some embodiments, the controller 204 may control the power supply 202 to provide multiple heating profiles to the induction coil 260 to achieve controlled induction heating of the pot bottom 120.

[0039] Figure 4 This is a flowchart illustrating a method 400 for operating an induction cooker to heat a food product (such as popcorn) according to an embodiment of the present technology. Method 400 can be used to operate, for example... Figures 1 to 3C As shown and about Figures 1 to 3C The induction cooker 100 is described. Therefore, refer to... Figures 1 to 3C Describe some aspects of method 400.

[0040] One advantage of induction heating is that it can provide a much higher heating rate than convection and radiation processes. However, in some situations, such rapid heating can be undesirable. For example, when making popcorn, the temperature in a non-induction cooker typically rises from about 350 degrees Fahrenheit to about 450 degrees Fahrenheit within a 3-minute period. This controlled heating process allows the starch in the kernels to gelatinize, and the soft, gelatinized cells stretch to form the foamy structure commonly associated with popcorn. However, induction heating can cook popcorn too quickly, potentially causing the starch in the kernels to harden and densify instead of softening and gelatinizing. Therefore, controlling the heating rate of the induction cooker is necessary.

[0041] At block 410, method 400 includes providing a first heating curve to induction cooker 100. In the illustrated embodiment, the first heating curve has a first fixed power output “fixed power output 1” and a first output period “output period 1” during which fixed power output 1 is provided to induction cooker. At block 420, method 400 includes providing a second heating curve to induction cooker 100 after the first heating curve. The second heating curve includes a second fixed power output “fixed power output 2” and a second output period “output period 2” during which fixed power output 2 is provided to induction cooker 100. At block 430, the method includes providing an nth heating curve to induction cooker 100 after the second (or any subsequent) heating curve. The nth heating curve includes an nth fixed power output “fixed power output n” and an nth output period “output period n” during which fixed power output n is provided to induction cooker 100. The heating curves may be provided by a power supply (e.g., power supply 202) according to instructions from a controller (e.g., controller 204). The fixed power outputs (i.e., fixed power output 1, fixed power output 2, fixed power output n) and / or output periods (i.e., output period 1, output period 2, output period n) of the first, second, and n heating curves can be different, allowing variable energy input to be provided to the induction cooker. The heating curves can be configured such that induction heating can simulate the heating rates of other heating methods, such as oil-based heating. In some embodiments, the method includes providing additional heating curves and / or periods of no heating. An example method of providing six different heating curves is shown below.

[0042]

[0043] As shown in the table above, the first fixed power output (i.e., 6000 W) is set high to take advantage of the ability of induction heating to raise the temperature of pot 100 very quickly. After 30 seconds, the power output is reduced to a second fixed power output (i.e., 2100 W) to avoid cooking the food (e.g., popcorn) too quickly. After another 30 seconds, the following three heating curves are used to gradually increase the fixed power output (i.e., from 4100 W to 4850 W to 5600 W) and the corresponding temperature of pot 100. The fifth heating curve has an output period of 60 seconds, while the other heating curves shown each have an output period of 30 seconds. Finally, the heating is reduced to a sixth fixed power output (i.e., 3500 W). As mentioned earlier, various heating curves can be set to simulate or improve other heating methods, such as properly gelatinizing the starch in corn kernels. The total elapsed time can also be controlled to be similar to the total elapsed time when cooking using non-induction heating. In other embodiments, the heating curve may include other fixed power outputs (e.g., 500 W, 1500 W, 3000 W, 6500 W) and other output periods (e.g., 15 seconds, 45 seconds, 90 seconds, 120 seconds).

[0044] Many embodiments of the technology described herein can take the form of computer or machine or controller executable instructions, including routines executed by a programmable computer or controller. Those skilled in the art will understand that this technology can be practiced on computer / controller systems other than those shown and described below. The technology can be embodied in a dedicated computer, controller, or data processor specifically programmed, configured, or constructed to execute one or more of the computer executable instructions described below. Therefore, as commonly used herein, the terms “computer” and “controller” refer to any data processor and can include internet-connected appliances and handheld devices (including PDAs, wearable computers, cellular or mobile phones, multiprocessor systems, processor-based or programmable consumer electronics, network computers, minicomputers, etc.). Information processed by these computers can be presented on any suitable display medium, including liquid crystal displays (LCDs).

[0045] This technology can also be implemented in a distributed environment, where tasks or modules are executed by remote processing devices linked via a communication network. In a distributed computing environment, program modules or subroutines can reside on both local and remote memory storage devices. The aspects of the technology described below can be stored or distributed on computer-readable media (including magnetically or optically readable or removable computer disks) or electronically via a network. The data structures and data transmissions specific to the aspects of this technology are also included within the scope of implementations of this technology.

[0046] For example, for convenience, this technique is illustrated according to aspects of the numbered examples (1, 2, 3, etc.) described below. These are provided as examples and do not limit the technique. It is worth noting that any item in the dependent examples can be combined in any way and placed in the corresponding independent examples. Other examples can be presented in a similar manner.

[0047] 1. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; The sensing assembly includes an induction coil configured to inductively heat the bottom of the pot; and A spacer that couples the bottom of the pot to the sensing component, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes.

[0048] 2. The induction cooker as described in Example 1, further comprising: A pot base, wherein a peripheral portion of the pot bottom is coupled to the pot base at a fixed distance, such that a central portion of the pot bottom is configured to move when the pot bottom flexes, and wherein a spacer is coupled to the central portion of the pot bottom.

[0049] 3. The induction cooker as described in Example 1 or Example 2, wherein the spacer is configured to be coupled to a central portion of the bottom of the cooker.

[0050] 4. The induction cooker as described in any one of Examples 1 to 3, wherein the induction component further comprises: A plate configured to support the induction coil, wherein the spacer is coupled to a central portion of the plate such that the central portion of the plate is configured to move when the bottom of the pot flexes.

[0051] 5. The induction cooker as described in Example 4, wherein the plate includes a plurality of slots extending radially outward from the central portion of the plate.

[0052] 6. The induction cooker as described in Example 4 or Example 5, wherein the induction component further comprises: An induction base configured to support the plate, wherein a peripheral portion of the induction base is coupled to a peripheral portion of the bottom of the pot at a fixed distance.

[0053] 7. The induction cooker as described in Example 6, wherein the induction base includes a plurality of slots extending radially outward from the central portion of the induction base.

[0054] 8. The induction cooker as described in any one of Examples 1 to 7, further comprising an insulating material between the bottom of the cooker and the induction coil.

[0055] 9. A method for operating an induction cooker, comprising: Provide the induction cooker with a first heating curve; and A second heating curve is provided to the induction cooker. Each of the first heating curve and the second heating curve has a fixed power output and a fixed output period, and The fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

[0056] 10. The method as described in Example 9, wherein the fixed power output of each of the first heating curve and the second heating curve is in the range of 1500 watts to 6500 watts.

[0057] 11. The method as described in Example 9 or Example 10, wherein the output time period of each of the first heating curve and the second heating curve is between 15 seconds and 90 seconds.

[0058] 12. The method of any one of Examples 9 to 11, wherein the first heating curve and the second heating curve are configured to gelatinize the starch in the corn kernels while the induction cooker is popping popcorn.

[0059] 13. The method of any one of Examples 9 to 12, wherein the first heating curve and the second heating curve are provided by a power supply configured to be controlled by a controller.

[0060] 14. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; A sensing component, the sensing component including an induction coil configured to inductively heat the bottom of the pot; A spacer, the spacer coupling the bottom of the pot to the sensing assembly, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes; and A power supply configured to provide a first heating curve and a second heating curve to the induction coil, wherein each of the first heating curve and the second heating curve has a fixed power output and an output period, and wherein the fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

[0061] 15. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; The sensing assembly includes an induction coil configured to inductively heat the bottom of the pot; and A spacer that contacts the bottom of the pot and the sensing assembly, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes.

[0062] 16. The induction cooker as described in Example 15, further comprising: A pot base, wherein a peripheral portion of the pot bottom is coupled to the pot base at a fixed distance, such that a central portion of the pot bottom is configured to move when the pot bottom flexes, and wherein the spacer contacts the central portion of the pot bottom.

[0063] 17. The induction cooker as described in Example 15 or Example 16, wherein the bottom of the cooker includes a central opening, and wherein the induction cooker further comprises: A hub, disposed above a central portion of the bottom of the pot, wherein the hub includes a protrusion extending through and beyond the central opening of the bottom of the pot, and wherein the spacer includes a feature configured to receive the protrusion of the hub.

[0064] 18. The induction cooker as described in any one of Examples 15 to 17, wherein the induction assembly further comprises: A plate configured to support the induction coil, wherein the spacer contacts a central portion of the plate such that the central portion of the plate is configured to move when the bottom of the pot flexes.

[0065] 19. The induction cooker as described in Example 18, wherein the plate includes a plurality of slots extending radially outward from the central portion of the plate.

[0066] 20. The induction cooker as described in Example 19, wherein the plurality of slots define a plurality of wedges interconnected at a peripheral portion of the plate and extending inwardly from the peripheral portion of the plate, wherein each of the wedges includes a corresponding tip portion, and wherein the central portion of the plate includes the tip portion of the wedge.

[0067] 21. The induction cooker as described in any one of Examples 15 to 20, wherein the induction assembly further comprises: An induction base configured to support the induction coil, wherein a peripheral portion of the induction base is coupled to a peripheral portion of the bottom of the pot at a fixed distance.

[0068] 22. The induction cooker as described in Example 21, wherein the induction component further comprises: A sensing wall extends between the bottom of the pot and the sensing base, wherein the sensing base and the sensing wall are clamped against the bottom surface of the bottom of the pot.

[0069] 23. The induction cooker as described in Example 21, wherein the induction base includes a plurality of slots extending radially outward from the central portion of the induction base.

[0070] 24. The induction cooker as described in any one of Examples 15 to 23, further comprising an insulating material disposed between the bottom of the cooker and the induction coil.

[0071] 25. The induction cooker as described in any one of Examples 15 to 24, wherein the bottom of the cooker is shaped downwards in a disc shape before being heated.

[0072] 26. The induction cooker as described in any one of Examples 15 to 25, wherein the spacer contacts the central portion of the bottom of the cooker and the central portion of the induction assembly.

[0073] 27. A method for operating an induction cooker, comprising: Provide the induction cooker with a first heating curve; and A second heating curve is provided to the induction cooker. Each of the first heating curve and the second heating curve has a fixed power output and a fixed output period, and The fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

[0074] 28. The method as described in Example 27, wherein the fixed power output of each of the first heating curve and the second heating curve is in the range of 1,500 watts to 6,500 watts.

[0075] 29. The method as described in Example 27 or Example 28, wherein the output period of each of the first heating curve and the second heating curve is between 15 seconds and 90 seconds.

[0076] 30. The method of any one of Examples 27 to 29, wherein the first heating curve and the second heating curve are configured to gelatinize the starch in the corn kernels while the induction cooker is popping popcorn.

[0077] 31. The method of any one of Examples 27 to 30, wherein the first heating curve and the second heating curve are provided by a power supply controlled by a controller.

[0078] 32. The method of any one of Examples 27 to 31, wherein the induction pot includes a pot bottom and an induction coil, and wherein the method further includes maintaining a constant distance between the pot bottom and the induction coil while providing both the first heating curve and the second heating curve.

[0079] 33. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; A sensing component, the sensing component including an induction coil configured to inductively heat the bottom of the pot; A spacer operably disposed between the bottom of the pot and the sensing assembly, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes; and A controller configured to modulate the power sent to the induction coil to provide a first heating curve and a second heating curve to the bottom of the pot, wherein each of the first heating curve and the second heating curve has a fixed power output and an output period, and wherein the fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

[0080] 34. The induction cooker as described in Example 33, wherein the fixed power output of each of the first heating curve and the second heating curve is between 1,500 watts and 6,500 watts, and wherein the output time period of each of the first heating curve and the second heating curve is between 15 seconds and 90 seconds.

[0081] Generally, the detailed description of embodiments of this technology is not intended to be exhaustive or to limit the invention to the precise forms disclosed above. While specific embodiments and examples of this technology have been described above for illustrative purposes, various equivalent modifications are possible within the scope of this technology, as will be recognized by those skilled in the art. The teachings of this technology provided herein can be applied to other systems, not necessarily those described herein. Elements and actions of the various embodiments described herein can be combined to provide further embodiments. Any patents, applications, and other references (including any that may be listed in the accompanying filings) are incorporated herein by reference. If necessary, modifications may be made to various aspects of this technology to provide further embodiments of this technology by incorporating the systems, functions, and concepts of the various references described above.

[0082] In view of the above specific embodiments, these and other changes can be made to this technology. While the above description details certain embodiments of this technology and describes the intended best mode, this technology can be practiced in many ways, however detailed it may appear in the text. The details of this technology can vary considerably in the details of its implementation, but are still covered by the technology disclosed herein. As noted above, specific terms used in describing certain features or aspects of this technology should not be construed as implying that such terms are being redefined herein as limited to any particular characteristic, feature, or aspect of the technology associated with that term. Generally, unless the foregoing detailed description expressly defines the terms used in the appended claims, such terms should not be construed as limiting the technology to the specific embodiments disclosed in the specification. Therefore, the actual scope of the invention covers not only the disclosed embodiments but also all equivalent ways of practicing or implementing this technology.

Claims

1. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; A sensing component, the sensing component including an induction coil configured to inductively heat the bottom of the pot; and A spacer that couples the bottom of the pot to the sensing component, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes.

2. The induction cooker as described in claim 1, further comprising: A pot base, wherein a peripheral portion of the pot bottom is coupled to the pot base at a fixed distance, such that a central portion of the pot bottom is configured to move relative to the pot base when the pot bottom flexes, and wherein a spacer is coupled to the central portion of the pot bottom.

3. The induction cooker of claim 1, wherein the bottom of the cooker includes a central opening, and wherein the induction cooker further comprises: A rotatable hub carrying one or more stirring blades, wherein the hub includes a protrusion extending downward through the central orifice at the bottom of the pot, and wherein the spacer is operatively coupled to the hub.

4. The induction cooker of claim 1, wherein the induction component further comprises: A plate configured to support the induction coil, wherein the spacer contacts a central portion of the plate such that the central portion of the plate is configured to move when the bottom of the pot flexes.

5. The induction cooker of claim 4, wherein the plate includes a plurality of slots extending radially outward from the central portion of the plate.

6. The induction cooker of claim 5, wherein the plurality of slots are defined as a plurality of wedges interconnected at a peripheral portion of the plate and extending inwardly from the peripheral portion of the plate, wherein each of the wedges includes a corresponding tip portion, and wherein the central portion of the plate includes the tip portion of the wedge.

7. The induction cooker of claim 1, wherein the induction component further comprises: An induction base configured to support the induction coil, wherein a peripheral portion of the induction base is coupled to a peripheral portion of the bottom of the pot at a fixed distance.

8. The induction cooker of claim 7, wherein the induction component further comprises: A sensing wall extends between the bottom of the pot and the sensing base, wherein the sensing base and the sensing wall are clamped against the bottom surface of the bottom of the pot.

9. The induction cooker of claim 7, wherein the induction base includes a plurality of slots extending radially outward from the central portion of the induction base.

10. The induction cooker of claim 1, further comprising an insulating material operably disposed between the bottom of the cooker and the induction coil.

11. The induction cooker of claim 1, wherein the bottom of the cooker is shaped downwards in a disc shape before being heated.

12. The induction cooker of claim 1, wherein the spacer is in contact with the central portion of the bottom of the cooker and the central portion of the induction assembly.

13. A method for operating an induction cooker, comprising: A first heating curve is provided to the induction cooker; as well as A second heating curve is provided to the induction cooker. Each of the first heating curve and the second heating curve has a fixed power output and a fixed output period, and The fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

14. The method of claim 13, wherein the fixed power output of each of the first heating curve and the second heating curve is between 1500 watts and 6500 watts.

15. The method of claim 13, wherein the output time period of each of the first heating curve and the second heating curve is between 15 seconds and 90 seconds.

16. The method of claim 13, wherein the first heating curve and the second heating curve are configured to gelatinize the starch in the corn kernels while the induction cooker is popping popcorn.

17. The method of claim 13, wherein the first heating curve and the second heating curve are provided by a power supply controlled by a controller.

18. The method of claim 13, wherein the induction pot includes a pot bottom and an induction coil, and wherein the method further includes maintaining a constant distance between the pot bottom and the induction coil when providing the first heating curve and the second heating curve.

19. An induction cooker, comprising: The bottom of the pot is configured to flex when heated; A sensing component, the sensing component including an induction coil configured to inductively heat the bottom of the pot; A spacer that couples the bottom of the pot to the sensing assembly, wherein the spacer is configured to maintain a fixed distance between the bottom of the pot and the sensing coil when the bottom of the pot flexes. and A controller configured to modulate the power sent to the induction coil to provide a first heating curve and a second heating curve to the bottom of the pot, wherein each of the first heating curve and the second heating curve has a fixed power output and an output period, and wherein the fixed power output of the first heating curve is different from the fixed power output of the second heating curve.

20. The induction cooker of claim 19, wherein the fixed power output of each of the first heating curve and the second heating curve is between 1500 watts and 6500 watts, and wherein the output time period of each of the first heating curve and the second heating curve is between 15 seconds and 90 seconds.

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