Abstract: An induction cooking system with an induction heating system, a cooktop, and cool touch cookware that has a target that is heated by induction. An absolute cookware temperature is directly sensed at one or more locations of the cookware, for example at the target. A relative cookware temperature can be determined based on the value of an electrical variable of a circuit that includes the target. The cookware can include a layer of thermal insulation directly below and spaced from the target by a gap. The insulation and gap act as the major heat insulating elements to keep the outer surface of the cookware cool. This allows the induction coil to be placed just below the cooktop, without any insulation between the coil and the cooktop. The cooktop can be cooled by placing a cooling chamber just below the cooktop and drawing air through the cooling chamber. The induction coil can be located in the cooling chamber.

Abstract: Plural induction heating coils for inductively heating to-be-heated object are provided under a top plate on which to-be-heated object is placed, and plural inverter circuits for supplying high-frequency currents to the plural induction heating coils, respectively, are adapted to be cooled by cooling air flows from cooling portions, and placed in a longitudinal row along the cooling air flows, in air-flow blowing path spaces through which cooling air flows from the cooling portions are blown, so as to facilitate cooling designing for an induction heating device and to improve the cooling performance of the induction heating device.

Abstract: Apparatus and method are provided for an electric induction brazing process in an inert atmosphere using a substantially oxygen-free copper alloy filler or preform under an inert atmosphere within a brazing chamber minimally sized for containment of the brazed joint region and an induction coil. The inert atmosphere may be nitrogen gas supplied from a liquid nitrogen source. For brazing of an open-interior fitting around a hole in a tubular material a nesting area is provided around the hole for seating of the filler or preform and the fitting.

Abstract: Disclosed is an apparatus for altering the temperature of a liquid, comprising: a pipe having a first end for receiving a liquid and a second end for discharging the liquid; and a thermal element for altering the temperature of the liquid, wherein the thermal element is located in the pipe such that the volume available for the liquid within the pipe is in the range 0 to 20% of the pipe volume.

Abstract: A heating cooker of the present invention includes a plurality of light emitting indicator units. The light emitting indicator units each have a temperature sensing unit that senses an ambient temperature of a light emission source. Therefore, deterioration of the light emission source of each of the light emitting indicator units can be suppressed to realize a further reduction in thickness, and to improve visibility of the indicator sheet.

Abstract: A device wherein food can be warmed by means of induction, said device comprising at least one secondary coil which is formed from a current conductor, whereon at least one heating element is connected. The invention also relates to a device which is used to transfer energy in a device in order to warm food by means of induction, said device comprising a primary coil which is connected to a voltage source and which is formed from a current conductor. According to the invention, the primary and secondary coil is cast into a coil body by casting means, and the insulating casting means exhibits a coefficient of thermal expansion which essentially corresponds to the coil body.

Abstract: A method of fabricating a thermoplastic component using inductive heating is described. The method includes positioning a plurality of induction heating coils to define a process area for the thermoplastic component, wherein the plurality of induction heating coils comprises a first set of coils and a second set of coils. The method also includes controlling a supply of electricity provided to the plurality of inductive heating coils to intermittently activate the coils. The intermittent activation is configured to facilitate prevention of electromagnetic interference between adjacent coils.

Abstract: An induction heating cooker in which a size of heating coils can be freely set without being restricted by a size of an opening of a cabinet of a kitchen unit. The induction heating cooker has an outer casing including a flange extending in an outward direction from a top portion of a container receptacle, with a heating coil container space being provided between the flange and a plate, such that one portion of each of the heating coils is disposed in the heating coil container space.

Abstract: An induction heating cooking apparatus includes a magnetic flux-shielding plate 28 to restrain magnetic flux leakage from a heating coil 24 and define a cooling air trunk 33, through which cooling air from a fan 32 passes. An infrared sensor 26 for detecting infrared rays emitted from a cooking container 22 and a control circuit 27 for controlling an output of a heating coil 24 depending on an output from the infrared sensor 26 are accommodated within the same space with respect to the magnetic flux-shielding plate 28 to thereby enhance assemblage. Also, the infrared sensor 26 is mainly cooled by cooling air passing through a cooling air trunk 33 to thereby enhance the cooling efficiency of the infrared sensor 26 and conduct correct temperature detection.

Abstract: An electromagnetic induction heater includes a supporting plate and a plurality of first induction coils. The supporting plate has a heating zone for placing at least one foodstuff container thereon. The heating zone includes a plurality of sub-heating zones. The first induction coils are located at the positions corresponding to the sub-heating zones respectively for heating the at least one foodstuff container. The first induction coils have elliptic profiles, and are located at an inner side of the supporting plate.

Abstract: A method and device for heating or hardening at least an axial segment of a rotationally-symmetric surface of a work piece includes rotating the work piece about its rotational axis and moving a peripheral portion of an inductor along a longitudinal profile of the axial segment of the rotating work piece with a constant spacing between the peripheral portion and the axial segment. At least a portion of the movement of the peripheral portion is composed of a first vector component in the direction of the rotational axis and a second component extending perpendicularly to the first vector component. The peripheral portion has a length in the rotational axis direction that is less the length of the axial segment in the rotational axis direction.

Abstract: A boosting circuit includes a switch element, a first coil, a second coil, and a capacitor. The switch element generates a first alternating current voltage having a first frequency from a direct current voltage. The first coil generates a magnetic field around the first coil with a flow of the first alternating current voltage having the first frequency in the first coil. The first coil also induces an eddy current in the object with the magnetic field to inductively heat the object. The second coil is cumulatively connected to the first coil. The capacitor is connected to the first coil and the second coil in a parallel manner.

Abstract: A reactor is provided with a coil, a core, and a case. The coil generates magnetic flux in response to supply of current thereto. The core is made of magnetic powder-containing resin filled in spaces inside and outside of the core. The case accommodates therein the coil and the core. The reactor is also provided with a cooling pipe (cooling member), which is arranged to be in contact with the core. A power converter is provided with semiconductor modules, a cooler, and the reactor. In the power converter, the cooler is arranged partially being in contact with the core of the reactor.

Abstract: A baking oven for producing baked molded products. The baking oven has an input station, a baking area and an output station. In addition, the oven has baking plates, which are arranged along a circulation path passing through the baking area, and a conveying device for the baking plates. The baking plates are in the form of susceptor plates, which can be heated inductively without contact. An induction heating device is provided in the baking area. This device includes at least one elongated inductor, which is arranged parallel to the circulation path of the baking plates and extends along the circulation path over a plurality of susceptor plates. The elongated inductor produces a large-area, broad magnetic field, which simultaneously inductively heats a plurality of baking plates in the form of susceptor plates without any contact.

Abstract: An induction cooking device includes a heating coil performing induction heating of a cooking container placed on a top plate, an inverter circuit supplying high frequency current to the heating coil, an infrared sensor detecting an amount of infrared light radiated from the cooking container and outputting a detection signal based on the detected amount, a temperature sensor detecting a temperature of the cooking container by thermal conduction through the top plate, and a control unit controlling an output of the inverter circuit so that the outputs of the infrared and temperature sensors do not exceed the respective control temperature. The control unit judges whether or not the infrared sensor is normally detecting the temperature of the cooking container, and when it is judged that the infrared sensor is normally detecting the temperature of the cooking container, the control unit raises the control temperature of the temperature sensor.

Abstract: A heating device includes a first induction coil, a second induction coil, a control panel, a power supply unit and a controlling unit. The control panel issues an adjusting signal. The power supply unit provides a first power and a second power to the first induction coil and the second induction coil, respectively. The controlling unit generates a control signal to the power supply unit according to the adjusting signal, thereby controlling the first power and the second power. Electrical energy is transmitted to the first induction coil and the second induction coil and the frequency difference between the first power and the second power is greater than 15 kHz or smaller than 1 kHz during a first time interval under control of the controlling unit. No electrical energy is transmitted to one of the first induction coil and the second induction coil during a second time interval under control of the controlling unit.

Abstract: A method and cooktop include a cooktop panel, a cooking zone, and an induction heating device disposed below the cooktop panel. First, second and third heat sensor units are disposed beneath the cooktop panel in a region of a measuring spot. The first heat sensor unit is configured to measure heat flow from substantially only the cooktop panel. The second and third heat sensor units are configured to measure heat flow from the cooktop panel and a cooking utensil disposed thereon. A light source is provided for measuring an emissivity of the bottom of the cooking utensil. An auxiliary heater heats the region of the measuring spot. An electrical control system calculates a ratio from signals of the second and third heat sensor units and determines an actual temperature of the bottom of the cooking utensil from the ratio by using a temperature of a lower surface of the cooktop panel measured by the first sensor unit and a value of the emissivity of the cooking utensil bottom.

Abstract: An induction heating system (46) for use in cooking with a positive feedback mechanism (54, 56) by means of which the power applied to a cooking utensil (52) can be varied in a wide range by changing its position above an induction coil (10), and by means of which the circuitry (54) is automatically protected against overheating.

Abstract: A method for detecting the pan size and/or position in induction cooking hobs comprises providing at least a sensing circuit associated to a magnetic field concentrator, particularly a ferrite bar, and assessing an electrical parameter thereof correlated to the variation of the magnetic flux.

Abstract: A cooking appliance. The cooking appliance includes a cook top for a kitchen. One side of the cook top includes a cooking area with cooking areas. The cooking areas may be operated via an induction cooker. The bottom side of the cooking appliance has a display. The display can provide useful information thereon such as the time. The cook top can be arranged in a first horizontal position for use of the cooking areas, and folded to a second vertical position during non use to display information on the display. The cooking appliance also includes a data reader, such as an RFID reader or bar code scanner to obtain data from a food product package. The data may include suggested recipes, cooking temperatures, and/or cooking times. The obtained data may be used to assist in controlling the operation of the cooking areas.

Abstract: A method for detecting the presence of a cooking vessel on an induction heating element is disclosed. The induction element is placed below a glass surface and a conductive electrode placed below the glass surface to detect if a cooking utensil is placed on the induction heating element. The electrode measures capacitance, which indicates to the user whether the cooking utensil is present on one or more induction heating elements. After activation by a user, a second detection of the cooking utensil is accomplished by feeding power to the induction heating element and by assessing at least an electrical parameter of a power circuit thereof.

Abstract: In a method for controlling a static power conversion unit to an inductor, particularly for an induction system used in cooking appliances, the value of an electrical parameter of the circuit is monitored at predetermined time intervals and at a predetermined duty cycle of the power transistor switching frequency, and on the basis of the monitored value, the duty cycle is modulated accordingly between the predetermined time intervals in order to keep the delivered power at a predetermined constant value.

Abstract: An induction heating element including a circular inductor coil that has a circular outer contour and a ferrite element arrangement that has at least one ferrite element with a radially outer edge. At least at one curvature point, the radially outer edge of the ferrite element is curved to a greater degree than the circular outer contour of the inductor coil.

Abstract: An induction cookware comprising: a cooking body containing an inner pot inside, an insulation material disposed between the cooking body and the inner pot for maintaining the temperature of the inner pot. An induction coil is disposed in the bottom of the cooking body and with an extra magnetic field, the induction coil can generate AC current. The current flows through an electric heating tube connected to the bottom of the inner pot so as to heat the heating tube. Thereby, the heating tube directly transfer the heat to the inner pot for reducing the heat from transpiration. The structure of a cooking body with an inner pot inside can heat and slow cook the food inside the inner pot simultaneously, thus can add the delicious taste of the food and save the energy.

Abstract: An induction cooker includes a top plate (1) for placing an object to be heated thereon, a heating mode selection key (8) for allowing the user to select one control mode for heating the object to be heated between a manual heating mode in which the heat output is set by the user by using an output adjusting key (9) and at least another control mode in which the heat output is controlled automatically, and a heating off/on key (7) for starting to heat the object to be heated. In the standby mode, the controller starts heating only when the user operates the heating mode selection key (8) to change the mode to the cooking menu selection mode before operating the heating off/on key (7). When a predetermined time has elapsed in the cooking menu selection mode without a change in a selected control mode, the mode is changed to the standby mode.

Abstract: A cooking apparatus performing cooking with a cooking container disposed at any desired position on a cooking plate, and a heating device thereof. The cooking apparatus includes a cooking plate to receive a cooking container thereon, and at least one working coil disposed under the cooking plate to heat the cooking container, the at least one working coil including a first portion and a second portion having a different winding structure of a conducting wire which forms the working coil so that a winding density of the conducting wire at one of the first portion and the second portion is relatively higher than the other of the first portion and the second portion.

Abstract: A cylinder heater useful in fabricating sleeves for high pressure pump liners comprises a support rotatably supporting a hollow circular cylinder having a metallic powder layer contacting a portion of its inner surface. A vibration sensor indicates vibration of the cylinder, and at least one temperature sensor indicates at least one temperature of the cylinder. At least one circumferential induction heating coil around the cylinder is positionable via the support along the longitudinal axis of cylinder rotation. Longitudinal position and power output of at least one heating coil, and cylinder rotational speed, are adjusted by a controller communicating with the support, the vibration sensor, at least one temperature sensor, and at least one heating coil. Controlled heating of the cylinder and the metallic powder layer results in a stratified abrasion-resistant fused metallic layer on the cylinder's inner surface. The fused layer may be honed to make a liner sleeve.

Abstract: Methodology, apparatus and computer programming are provide that permit an induction cooking appliance to evaluate a utensil for use with the appliance. A user may manually initiate an evaluation that will prompt the user to place a utensil on the appliance for evaluation. An evaluation is made based on differences between the expected energy and actual energy delivered. A score related to suitability for use of the utensil may then be displayed to the user.

Abstract: An object of the present invention is to provide an induction heater and an induction heating method capable of heating by induction a work in which a gear portion and a shaft are integrated. An induction heater for a gear portion and a stepped shaft is arranged in such a manner that a first heating coil (annular coil) surrounds the gear portion and that a second heating coil (linear coil) faces the stepped shaft in an axial direction. Alternating currents of different frequencies are supplied to the first heating coil 1 and the second heating coil. Further, a part of the second heating coil is arranged so as to come opposite a boundary between the gear portion and the stepped shaft, thereby connecting a hardened pattern of the gear portion by the first heating coil and a hardened pattern of the stepped shaft by the second heating coil.

Abstract: In an induction heating body 1 in which heat is generated by eddy current induced by a high-frequency magnetic field, when forming a radially-directed separation section 31 separated from the center to the outer periphery, one of end brim parts 31a1 is superimposed on the other end brim parts 31a2 or they are close to each other with the end surfaces thereof 31b1 and 31b2 being abutted.

Abstract: An infrared permeable window 4a, which is surrounded by a light shielding layer 7b and is narrower than an infrared sensor display window 4g, is formed inwardly of the infrared sensor display window 4g, and an infrared incident area 43a for detecting infrared rays of light and a light emitting unit 56a are provided below the infrared permeable window 4a. Also, a light emitting surface 4b is provided inwardly of the infrared permeable window 4a, so that the user can assuredly place a cooking container P on the infrared permeable window 4a.

Abstract: An induction cooking system with an induction heating system, a cooktop, and cool touch cookware that has a target layer that is heated by induction. An absolute cookware temperature is directly sensed at one or more locations of the cookware, for example at the target layer. A relative cookware temperature can be determined based on the value of an electrical variable of a circuit that includes the target layer. The cookware can include a layer of thermal insulation directly below and spaced from the target layer by a gap. The insulation and gap act as the major heat insulating elements to keep the outer surface of the cookware cool. This allows the induction coil to be placed just below the cooktop, without any insulation between the coil and the cooktop. The cooktop can be cooled by placing a cooling chamber just below the cooktop and drawing air through the cooling chamber. The induction coil can be located in the cooling chamber.

Abstract: Methods and devices for securing the bottom of an item of cookware to the burner of a stove top by use of magnetism. The magnet(s) may be permanent magnets or electromagnets. The cookware may comprise a permanent magnet disposed on or in the base of the cookware. The burner comprises a magnetic material such as steel or iron. The magnetic material may be in the grate of the cook top, in the electric coil of an electric burner, in the surface of a vitroceramic or smooth-top stove top, or other component of the cook top in close proximity to the bottom of the cookware when it is on the cooking surface. The magnetic source prevents the cookware from being accidentally knocked off the cook top.

Abstract: An induction heater which has an electrical conductor between a heating coil and a top plate. The electrical conductor has an extended portion formed downward from its outer periphery. The extended portion has a connector at its tip for coupling to a low-potential part. A thermal-connection reducing means is provided on the extended portion. A cross-sectional shape near a bent portion of the extended portion is made uniform. With the above structure, the electrical conductor has both the functions of decreasing the buoyancy and electrostatic shielding. This structure uses a smaller number of components, eliminates the risk of electric shock to the human body, and prevents uplift of an object to be heated. The thermal-connection reducing means reduces heat conduction to a connected part. Accordingly, a highly reliable and compact apparatus becomes available.

Abstract: An induction heating cooker includes a plurality of heating coil blocks including one or more heating coils, a plurality of inverters to supply a high-frequency voltage to each of the heating coils, and a controller to control operations of the plurality of inverters to alternately supply the high-frequency voltage to each heating coil block and detect a heating coil, on which a container is placed, from among the heating coils belonging to each of the plurality of heating coil blocks. Using this configuration, it is possible to reduce the influence of magnetic field interference between adjacent heating coils when detecting the position of the container and to increase container position detection accuracy.

Abstract: Disclosed herein are an induction heating cooker and a control method thereof in which heating coils on which a container is located are sensed, a display unit displays a region corresponding to the heating coils on which the container is located, the displayed region is selected by a user, an output adjustment unit as to the displayed region is displayed, and output of the corresponding heating coils is adjusted by adjusting the output adjustment unit. The induction heating cooker includes heating coils to heat the container, a display unit to display the sensed container or the output adjustment unit of the heating coils, and the output adjustment unit to adjust the output of the heating coils on which the container is located.

Abstract: A heating device includes a first induction coil, a second induction coil, a first phase power unit, a second phase power unit, a power controller and a user interface unit. The second induction coil isn't always concentric with the first induction coil. The first phase power unit is connected with the first induction coil, and configured for receiving a first phase input voltage and outputting a first voltage. The second phase power unit is connected with the second induction coil, and configured for receiving a second phase input voltage and outputting a second voltage. There is a phase difference between the first phase input voltage and the second phase input voltage. The power controller is used for controlling operations of the first phase power unit and the second phase power unit. The user interface unit is connected with the power controller for controlling the power controller.

Abstract: An induction heating cooker includes a top plate adapted to have an object placed thereon, plural heating coils provided below a lower surface of the top plate, an inverter for supplying high-frequency power to the heating coils, a data memory, and a controller controlling the inverter. The data memory stores first and second heating coil patterns. Each of the first and second heating coil patterns defines one or more heatable regions and one or more non-heatable regions. The controller selects a heating coil pattern from the first and second coil patterns. The controller controls the inverter such that high-frequency power can be supplied to one or more first heating coils out of the plural heating coils located in the one or more heatable regions of the selected heating coil pattern.

Abstract: An object of the present invention is to provide an induction heating cooker with which the size of heating coils can freely be set without being restricted by the size of an opening of a cabinet of a kitchen unit. To this end, the induction heating cooker of the present invention has its outer casing 15 structured to have a flange 7 extended in an outward direction from the top portion of a container receptacle 8, with a heating coil container space 16 being provided between the flange 7 and a plate 1, such that one portions of heating coils 2 and 3 are disposed in the space 16.

Abstract: An induction heat cooking device is provided that finishes preheating in a short time and maintains the temperature obtained at the finish of the preheating. When a preheating heating mode is selected as an operation mode, a control unit (8) arranged in the induction heat cooking device starts operation in a preheating mode in which a cooking container is heated with a first heating output. When an increment of an output value of an infrared sensor exceeds a first predetermined increment since the heating starts with the first heating output, the control unit causes a notification unit to notify a user that the preheating is finished, and the operation mode is changed to a waiting mode for performing heating with a second heating output that is lower than the first heating output. Further, when the user sets a heating power by means of a heating power setting unit in the preheating mode, the control unit prohibits changing to the heating power set by the user.

Abstract: This invention relates to a cooking appliance (1), in particular to a household cooking appliance, encompassing a base unit (2) that is mounted on a wall (3) or on a countertop (4), as well as a stove top (5) that can be tilted relative to the base unit (2). For a space-saving implementation of the stove top and to achieve highly efficient food-heating performance, the invention provides for a stove top (5) with at least one induction coil (6) while the electric power supply (14) is housed in the base unit (2).

Abstract: A device for heating food using induction, including a base element having a secondary winding configured from a current conductor and a heating element that is connected to the winding. To reduce the height of the base element, a winding core is located inside the winding. Further, a device for transmitting energy to a device for heating food by induction, the former device including a primary winding that is configured from a current conductor and is connected to a voltage source.

Abstract: A heating device includes a first induction coil, a second induction coil, a control panel, a power supply unit and a controlling unit. The control panel issues an adjusting signal. The power supply unit provides a first power and a second power to the first induction coil and the second induction coil, respectively. The controlling unit generates a control signal to the power supply unit according to the adjusting signal, thereby controlling the first power and the second power. Electrical energy is transmitted to the first induction coil and the second induction coil and the frequency difference between the first power and the second power is greater than 15 kHz or smaller than 1 kHz during a first time interval under control of the controlling unit. No electrical energy is transmitted to one of the first induction coil and the second induction coil during a second time interval under control of the controlling unit.

Abstract: A dual coil induction cooking system and method for heating ferrous and non-ferrous cooking vessels. The system includes a first resonant circuit for inducing a current in a ferrous metal cooking vessel at a first frequency and a second resonant circuit, wired in a parallel combination with the first resonant circuit, for inducing a current in a non-ferrous metal cooking vessel at a second frequency. The system also includes a power source for powering the parallel combination, so that one of the first and the second resonant circuits is coupled to supply power through the parallel combination to a respective one of the cooking vessels. A method for coupling power to a load includes sweeping a parallel combination of resonant circuits with a variable frequency power, detecting a resonant frequency response corresponding to a metallic composition of the load, and simultaneously powering the parallel combination of resonant circuits at a frequency corresponding to the detected resonant frequency.

Abstract: An induction heating cooking apparatus includes a top plate on which a cooking pot is placed, a coil, an inverter board, a supporting bed, a board holder and elastic bodies. The coil induction-heats the cooking pot. The inverter board is mounted with components for driving the heating coil. The supporting bed is disposed above the inverter board and supports the heating coil. The supporting bed is provided with a push-up boss, and is pushed upward to the top plate via the push-up boss. The board holder is provided with three or more number of support bosses, and holds the inverter board. Each of the elastic bodies intervenes between the supporting bed and one of the support bosses. The supporting bed is provided with first slide restricting sections, while each support boss with a second slide restricting section.

Abstract: There is provided an induction heating cooker capable of preventing a pan having a pan bottom warped in a convex shape or a pan having a pan bottom with a small thickness from being excessively heated. The induction heating cooker includes a heating coil (2) operable to perform induction heating of a cooking container, an inverter circuit (7) operable to supply a high-frequency current to the heating coil, an infrared ray sensor (3) operable to detect an infrared ray radiated from the cooking container, an electric power integrating section (81) operable to integrate an amount of heating electric power outputted from the inverter circuit, and a heating control section (82) operable to control the output of the inverter circuit.

Abstract: An induction electrical appliance comprising: a first shell, a first pan, a first heating element used fro heating the first pan and a first induction coil. The first shell detachably connected to the first pan, the food can be placed on the first grilling surface of the first pan, the first heating surface of the first pan fixedly connected to a first heating element, which is electrically connected to the induction coil. Thereby, the induction coil generates inducted current by extra magnetic field and inputs the current to the first heating element. Thus the first heating element can generate higher heat energy, and further enlarger the cooking temperature range of the first pan. Moreover, the cooking temperature can be adjusted according to the different food to let the food be more delicious.

Abstract: An improved system and methods useful for the cooking of one or more food items by the application of a non-ambient temperature developed within a temperature retentive element. The temperature retentive element can be sized and shaped to form a cooking box in which cooking at a temperature relative to the non-ambient temperature may proceed and from which the food item, when fully cooked, may be served.

Abstract: An infrared sensor 26 is provided on a lower side of a top plate 2 to detect an amount of infrared light radiated from a heated object 20. The infrared sensor 26 outputs an detection signal having a substantially constant magnitude with respect to the temperature of the heated object 20 when the temperature of the heated object 20 is lower than a detection lower limit temperature, and outputs a detection signal having magnitude and rate of increase which become larger as the temperature of the heated object 20 becomes higher when the temperature of the heated object 20 is not lower than the detection lower limit temperature. The control unit 29 includes a storage unit 29a operable to store the output value of the infrared sensor 26 immediately after start of heating as an initial detection value, and reduces the output of the induction heating coils or stops the heating when an increased amount with respect to the initial detection value becomes greater than or equal to a predetermined value.

Abstract: A frequency converter circuit has at least two outputs that are respectively connected to a load, in particular an induction coil. A first output is operated at a first switching frequency and a second output is simultaneously operated at a second switching frequency that is different from the first, in such a way that noise having a frequency generated by the superposition of the first switching frequency and the second switching frequency is produced. The frequency converter circuit is operated in such a way that the frequency of the noise is lower than a first cutoff frequency and/or is higher than a second cutoff frequency. An induction cooking device includes first and second induction heating elements, and a frequency converter circuit including first and second power outputs electrically coupled to the first and second induction heating elements, respectively.