Abstract: It is an object of the present invention to provide an induction heating apparatus that can enable a plurality of heating coil to perform heating by sharing a inverter having semiconductor switches in use, thereby adjusting a power without increasing losses of the semiconductor switches so much with respect to the respective heating coils, the present invention being configured such that the inverter alternately outputs drive signals respectively having each of two operating frequencies to the plurality of heating coils in every predetermined operation lapse of time and the plurality of heating coils are respectively connected to capacitance circuits in the inverter to have the different frequency characteristics.

Abstract: An induction heater includes a plurality of heating coils, a plurality of inverters, a plurality of switching circuits, command unit, sensor group, and container detection unit. The number of inverters supplying a high-frequency current to the heating coils is less than the number of heating coils. Each of the switching circuits switches an electric path of each of the heating coils such that each heating coil is connected or not connected to any of the inverters. The command unit controls driving of the inverters and switching of the switching circuits. Each sensor in the sensor group detects a response of a resonance circuit including the heating coil relative to power supply from the inverters. The container detection unit detects whether or not heating target is placed on the heating coil based on an output of the sensor. This enables to retain safety and reduce cost of the induction heater equipped with the plurality of heating coils.

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: 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: In a non-contact power transmission device according to the present invention, a non-contact power receiving device includes a changeover portion for opening and closing the connection between a power receiving coil and a load device which is supplied with electric power from the power receiving coil, the power receiving coil being adapted to output electric power by receiving a high-frequency magnetic field from an induction heating apparatus used as a feeding apparatus, wherein a power-reception-side control portion for controlling opening/closing operations of the changeover portion is adapted to control the opening/closing operations of the changeover portion, in order to adjust the electric power supplied to the load device from the power receiving coil.

Abstract: A non-contact power receiving device utilizes, as a power-supply device, an induction heating device equipped with a load-temperature detecting function of detecting light from a load to detect the temperature of the load and of controlling an induction heating operation when the temperature of the load is equal to or higher than a predetermined temperature, wherein an electric-power-reception-side control portion in the non-contact power receiving device is adapted to cause a light emitting portion to emit light to operate the load-temperature detecting function in the induction heating device for controlling the supply of electric power from the induction heating device to the non-contact power receiving device, when the value detected by a state detection portion is equal to or more than a set value.

Abstract: A contactless power feeder of the present invention includes: a top plate which is mounted with a load; a primary coil which is arranged below the top plate and generates a high-frequency field; an inverter which feeds high-frequency power to the primary coil; a control part which controls the inverter; and a load discriminating part which determines whether the load is an object to be heated that is a metal container such as a pot and should be induction-heated, or a power receiving device provided with a secondary coil that is electromagnetically coupled with the primary coil, wherein the control part is configured to control the inverter in accordance with a result of determination by the load discriminating part.

Abstract: In an induction heating coil according to the present invention, in order to reduce heat losses for increasing the thermal efficiency and, also, in order to improve the heat resistance for ensuring safety, with a simple structure, a coil portion for performing induction heating on an object to be heated is constituted by a plurality of conductor wires which are made of a metal conductor and are wound spirally in substantially the same plane, and a space portion having at least an adhesive property and an insulation property which is adapted to adhere and secure adjacent conductor wires of the plurality of conductor wires wound spirally, with predetermined spacing provided therebetween, such that the conductor wires form an integrated disk shape.

Abstract: An induction heating apparatus according to the present invention includes: an inverter circuit which outputs an AC signal through ON and OFF operations of a plurality of switching devices; a control portion which drives and controls the plurality of switching devices; and a plurality of resonant circuits which includes respective resonant capacitors and respective heating coils for inductively heating an object to be heated; wherein the switching devices are driven and controlled, by using, as an operating range, a frequency range higher than a highest resonance frequency, or a frequency range lower than lowest resonance frequency, out of respective resonance frequencies of the plurality of resonant circuits, and the respective heating coils in the plurality of resonant circuits are combined to form at least a single induction heating source.

Abstract: It is an object of the present invention to provide an induction heating apparatus that can enable a plurality of heating coil to perform heating by sharing a inverter having semiconductor switches in use, thereby adjusting a power without increasing losses of the semiconductor switches so much with respect to the respective heating coils, the present invention being configured such that the inverter alternately outputs drive signals respectively having each of two operating frequencies to the plurality of heating coils in every predetermined operation lapse of time and the plurality of heating coils are respectively connected to capacitance circuits in the inverter to have the different frequency characteristics.

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: 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 heating device includes a top plate arranged to have an object placed thereon, a heating coil receiving a high-frequency current to inductively heat the object, an infrared ray sensor for outputting a signal in accordance with energy of received infrared ray, a temperature detector for detecting a temperature of the object based on the signal output from the infrared ray sensor, a heating controller for controlling the high-frequency current supplied to the heating coil based on the detected temperature, and a failure determining unit for determining whether the infrared ray sensor has a failure or not. This induction heating device can detect the failure of the infrared ray sensor, and thus stops or suppresses the heating upon detecting the failure of the infrared ray sensor.

Abstract: Timing of zero voltage in zero-voltage detector for detecting zero voltage of a commercial power supply 1 is predicted and input from the zero-voltage detector 6 is received only for a given time before and after the predicted timing, whereby overvoltage and overcurrent caused by a zero point shift can be prevented. Thus, it is provided a magnetron drive power supply which is excellent in stability for change in the power supply environment such as noise or instantaneous power interruption.

Abstract: The present invention provides a boosting transformer for microwave oven, which is low in high-frequency loss, hardly saturated, small in size and easy to produce. The boosting transformer includes a rod-like ferrite core; and primary, secondary and heater windings wound around the rod-like ferrite core and piled up side by side in a direction of an axis of the rod-like ferrite core. It also includes a metal core formed from a long metal thin plate rolled by a plurality of times into a square-ring having one inner diameter larger than each of outer sizes of the primary, secondary and heater windings and the other inner diameter larger than a total size of the three windings piled up side by side, the metal core being arranged opposite to the rod-like ferrite core through a gap so as to be fitted toward the rod-like ferrite core from the outside of the primary, secondary and heater windings.

Abstract: Timing of zero voltage in zero-voltage detector for detecting zero voltage of a commercial power supply 1 is predicted and input from the zero-voltage detector 6 is received only for a given time before and after the predicted timing, whereby overvoltage and overcurrent caused by a zero point shift can be prevented. Thus, it is provided a magnetron drive power supply which is excellent in stability for change in the power supply environment such as noise or instantaneous power interruption.

Abstract: A Hall element (H) is arranged at an air gap of a choke coil (30). Power semiconductor elements (P1) and (P2) are attached to a heat radiation fin (61) directly by soldering. A rectangular-hollow-shaped metal core (27) is formed by winding a long metal thin plate multiple turns into a rectangular-hollow-shape and is fitted to a bar shaped ferrite core (26) from outside of the primary winding (21) and the secondary winding (22). The inner diameter of one side of the rectangular-hollow-shape core is larger than both outer diameters of the primary winding (21) and the secondary winding (22) and the inner diameter of the other side of the rectangular-hollow-shape core is larger than the height of the primary winding (21) and the secondary winding (22). The rectangular-hollow-shape (27) core is arranged such that an air gap (G) exists between the rectangular-hollow-shape core (27) and the bar shaped ferrite core (26).

Abstract: The present invention provides a boosting transformer for microwave oven, which is low in high-frequency loss, hardly saturated, small in size and easy to produce. The boosting transformer includes a rod-like ferrite core; and primary, secondary and heater windings wound around the rod-like ferrite core and piled up side by side in a direction of an axis of the rod-like ferrite core. It also includes a metal core formed from a long metal thin plate rolled by a plurality of times into a square-ring having one inner diameter larger than each of outer sizes of the primary, secondary and heater windings and the other inner diameter larger than a total size of the three windings piled up side by side, the metal core being arranged opposite to the rod-like ferrite core through a gap so as to be fitted toward the rod-like ferrite core from the outside of the primary, secondary and heater windings.

Abstract: An induction heating apparatus can heat aluminum pot etc. with pot vibration noise being suppressed. During a turn-on time of second switching device 57, an energy is accumulated at choke coil 54, and at the same time a resonant current with a shorter period than the turn-on time of second switching device 57 or a driving time of first switching device 55 is generated at heating coil 59, so that during turn-off of second switching device 57, i.e., during on-time of first switching device 55, the energy accumulated at choke coil 54 is transferred to second smoothing capacitor 62. And then the output power is supplied from smoothing capacitor 62 to heating coil 59, thereby reducing the pot vibration noise, which is caused by pulsating current of input voltage.

Abstract: A Hall element (H) is arranged a choke coil (30) having an air gap at the core portion thereof. Power semiconductor elements (P1) and (P2) are attached at a heat radiation fin (61) directly by soldering. A rectangular-hollow-shaped core (27) formed by a metal core winding a long metal thin plate plural turns in rectangular-hollow-shape is fitted to the bar shaped ferrite core (26) from outside of the primary winding (21) and the secondary winding (22). The inner diameter of one side of the rectangular-hollow-shape is larger than both outer diameters of the primary winding (21) and the secondary winding (22) and the inner diameter of the other side of the rectangular-hollow-shape is larger than piled length of the primary winding (21) and the secondary winding (22). At the above state, the rectangular-hollow-shape (27) core is arranged having an air gap (G).