Abstract: An inverter circuit of an induction heating rice cooker which controls a switching frequency of an inverter in a variable manner according to a variation in an input voltage and drives the inverter at the controlled switching frequency. The inverter circuit comprises a power supply circuit for rectifying and filtering a commercial alternating current (AC) voltage to supply the input voltage to the induction heating rice cooker. The inverter performs a switching operation based on the input voltage from the power supply circuit to heat the rice cooker. The inverter circuit further comprises an inverter driving circuit for outputting a drive pulse to control the switching frequency of the inverter in the variable manner according to the input voltage from the power supply circuit and drive the inverter at the controlled switching frequency.

Abstract: A microwave sealing structure prevents leakage of microwave to the outside of the cavity in which microwave resonates, in an apparatus using microwave which includes a cavity in which an internal space is formed so that microwave can resonate having an opening, and a door for opening/closing the opening. In the structure, an equivalent impedance circuit, formed with a rim of the opening and a cross-section of the rim of the door to prevent leakage of microwave out of the cavity, is a LC resonant circuit.

Abstract: Microwave oven with a toaster comprising a main case forming an outer shape, a cavity in the main case for cooking food therein with a microwave, an electronic chamber in one side part of the main case having different electronic components for providing the microwave to an inside of the cavity, and a toaster comprising a toaster case in front of the electronic chamber having slits in opposite sides respectively, a tray assembly mounted on the slits of the toaster case for introducing/taking out pieces of bread into/out of the toaster, a heater assembly in the toaster case for heating the pieces of bread, a toaster door on the toaster case, a door lock for holding the door, and a power source device for supplying power to the heater assembly, thereby providing a cooking function with a microwave, and toasting function with a toaster.

Abstract: A mountable type microwave oven including a blower fan assembly installed at a rear-upper portion of a cabinet to cool a machine room and ventilate a cooking chamber.

Abstract: Disclosed is an electric oven which increases temperature fast and reduces heat loss in accordance with that a cavity surface generates its own heat by using an induction heating. The electric oven comprises: a case having a door at a front side and having a cavity for receiving food therein; a magnetron installed at one side of an upper portion of the cavity for generating microwave of high frequency and supplying heat to the cavity; an inverter for generating high frequency at a space between the case and the cavity; first, second, third, and fourth heating units installed each side of the cavity for supplying heat. Since temperature of a cooking chamber can be set as wanted uniformly and faster, preheating time and actual cooking time can be reduced. Also, since inner temperature of the cavity rises faster and simultaneously, an automatic cleaning in the cavity using pyrolysis can be performed faster and uniformly, thereby reducing power consumption.

Abstract: A microwave oven incorporating toaster includes a tray provided on a tray support. The tray support moves forward and backward in inside the toaster. The tray support includes a bushing for moving within moving slots provided at both sidewalls of a toaster case. A connecting lever connects the bushing to a toaster door and translates a motion generated by operation of the toaster door when it opens and closes into a moving motion exhibited by the tray. A food item (e.g., a slice of bread, bagel, etc.) arranged on the tray may be inserted into, or removed from, the inside of the toaster by operating the toaster door.

Abstract: A plurality of slots are provided so as to be located between a thin plate flexible opening section screen member and a heating chamber wall surface 1 for allowing insertion of the opening section screen member. A gently-curved bulging surface exists in an area where the heating chamber wall surface 1 and the opening section screen member 5 are mated together. As a result, residual warpage which would otherwise remain when the opening section screen member is warped for attachment becomes invisible, thereby preventing occurrence of clearance, which would cause sparking or the like.

Abstract: A microwave oven which has a simple structure, and steams food placed in a cooking cavity without having a separate steaming container. The microwave oven includes the cooking cavity provided in a cabinet, a magnetron provided outside the cooking cavity to irradiate microwaves into the cooking cavity, and a microwave inlet hole formed on a predetermined portion of the cooking cavity to irradiate the microwaves from the magnetron into the cooking cavity. A steaming plate is provided in the cooking cavity so as to partition the cooking cavity into upper and lower sections, and blocks the microwaves and allows water vapor to pass therethrough. The microwave inlet hole communicates with a bottom of the steaming plate provided in the cooking cavity.

Abstract: An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil, a grounded heating roller magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

Abstract: A delivery apparatus is provided by the invention. The delivery apparatus includes a container for holding an article to be delivered and a heater. The container includes a housing forming an interior area and an opening. The opening is provided with a size sufficient to allow movement of the article from outside the container to within the interior area, and from within the interior area to outside the container. The heater is provided for placement within the interior area for heating the article. The heater includes an electrically conductive coil for providing an electric current when exposed to a magnetic field, and an electrical resistance heating element for generating heat. The electrical resistance heating element is provided in electrical connectivity with the electrically conductive coil. A delivery apparatus assembly is provided which includes an induction range for generating a magnetic field. A heater and a method for delivering food are provided by the invention.

Abstract: A microwave heating system is provided which uses a heat conductive medium. The heat conductive medium is heated in a heater. The heater includes a shell which forms an enclosure. The enclosure has an upper end and a lower end. A heating coil is located in the enclosure. The heating coil has an upper end and a lower end and has an inverted frusto-conical shape. The upper end of the heating coil is larger than the lower end. Three magnetrons are mounted adjacent the heating coil. One magnetron is located at the upper end of the heating coil and the other two magnetrons are located on opposite sides of the heating coil for directing microwave energy into the heating coil. An electrical distribution system is connected to the magnetron. A return line supplies the heat conductive medium into the heating coil adjacent the lower end of the shell. The heat conductive medium is fed through a feed line to a storage tank and into a two-stage domestic hot water heater.

Abstract: The invention concerns a heater made of a material (5) responsive to induction and capable of sustaining high temperatures. It further comprises at least an insulating thickness with low thermal conductivity, in particular a low temperature insulation (3) and a high temperature insulation (4), said thickness being fixed at the back of the material. A field winding (2) is adjacent to the insulating thickness and separated from the material (5) by the latter.

Abstract: A high frequency heating apparatus includes a switch attachment member for mounting switches, a switch operating member rotatably installed at the switch attachment member and a stopper for regulating the rotation of the switch operating member. The switch attachment member has a hole for accommodating therein a hook of a door key and a portion thereof functions to cover at least one switch.

Abstract: Disclosed is a circuit and a method for driving a DC microwave oven. The circuit for driving a DC microwave oven according to the present invention includes: an inverting means to convert DC into AC by a driving pulse; a high voltage transformer to transform the AC from the inverting means, and supply the transformed AC to a magnetron; a pulse driving means to generate the driving pulse; and an over-current detecting means to detect an electric current which is supplied to the inverting means from a DC power source, and output an over-current detect signal if the detected current is determined as an over-current, so as to avoid the generation of the driving pulse by the pulse driving means. According to the present invention, the driving of the magnetron could be stopped when a malfunction of an interlock switch caused by an error or the over-current from the DC power source is detected, and circuit elements can be advantageously prevented from being damaged by the over-current.

Abstract: Microwave oven including a main cabinet having a plurality of air inlet openings and a plurality of air outlet openings, for accommodating and protecting various components, an inner case provided in an upper space of the main cabinet to form a cooking chamber therein, the inner case having a plurality of inlet holes and outlet holes, an outfit chamber in a rear part of a lower space of the main cabinet for fitting electronic components therein, an inverter part in a front part of a lower space of the main cabinet, a magnetron part in a side space of the main cabinet, partition plates for separating a space for the inverter part, a space of the outfit chamber, and a space for the magnetron, respectively, and a single fan device in a part in contact with the spaces in common for circulating external air to the spaces in the main cabinet, thereby cooling the outfit chamber and the magnetron as well as preventing moisture in a cavity by using only one cooling fan and a fan motor.

Abstract: An induction heating roller, a fixing apparatus and an image forming apparatus are disclosed as including a heating roller (TR) comprised of a hollow roller base body (BB), composed of electrically insulating material, and a plurality of secondary coil components (ws), composed of closed circuits, respectively, which are formed over the roller base body. The heating roller (TR) internally receives an induction coil unit (IC) including a primary coil (wp) which is coupled with the secondary coils in a core-less transformer coupling relationship. The secondary coil components (ws) of the heating roller (TR) have a secondary resistance value (Ra) which is nearly equal to a secondary reactance (Xa), i.e. in case of Ra/Xa=?, a formula is expressed as 0.1<?<10. Further, the primary coil (wp) of the induction coil unit (IC) is comprised of a plurality of coil components which are connected between a wire pair (WP) in parallel to one another.

Abstract: A microwave oven incorporating a toaster includes a toaster door provided on a toaster panel for opening and closing at least one toaster entrance and a tray assembly. The tray assembly includes a tray support inside the toaster and at least one tray which is fastened to a top of the tray support for holding a food item. The tray includes at least one elevating bracket for maintaining a predetermined distance between the tray and the tray support. In addition, the tray assembly further includes a support wall provided at a front end of the tray for supporting a front lower portion of the food item so as to stably position the food item at an optimal location for toasting. In the microwave oven incorporating a toaster, each food item is positioned against a heater included therein so as to maximize the toasting performance of the toaster. Also the tray support can be easily disassembled and assembled for the purpose of cleaning and replacing with a new tray.

Abstract: The invention relates to a device for thawing at least one piece of sushi or similar foodstuff formed from a principal element intended to be served warm and at least one accompanying element intended to be served cold with a microwave oven. The device includes a package having at least one bottom, lateral walls and a top wall; and a microwave-reflective layer on an interior surface, wherein the top wall is permeable to microwaves and includes at least one cut-out to receive and hold the sushi or similar foodstuff.

Abstract: A method for the cooking and vacuum packing of food includes placing food that is to be cooked and vacuum packed inside a container; passing the container into a microwave tunnel which is suitable for the application of microwave energy to the container and food for the heating and cooking of the food inside the container; subjecting the container containing the food to microwave energy to heat the food; and ceasing the application of microwave energy such that the venting opening closes and, as the container cools, steam therein condenses, whereupon a vacuum arises inside the container. The cooking and vacuum packing take place in the same operation in the container and the container is flexible such that it molds itself to its contents when a vacuum arises in the container.

Abstract: A microwave oven incorporating toaster includes a tray provided on a tray support. The tray support moves forward and backward in inside the toaster. The tray support includes a bushing for moving within moving slots provided at both sidewalls of a toaster case. A connecting lever connects the bushing to a toaster door and translates a motion generated by operation of the toaster door when it opens and closes into a moving motion exhibited by the tray. A food item (e.g., a slice of bread, bagel, etc.) arranged on the tray may be inserted into, or removed from, the inside of the toaster by operating the toaster door.