Abstract: A microwave treatment apparatus includes a treatment chamber, a microwave supply, and a resonator unit. The treatment chamber is surrounded by a plurality of walls, and accommodates a heating target. The microwave supply supplies a microwave to the treatment chamber. The resonator unit is provided on one wall of the plurality of walls, and the resonator unit has a resonance frequency in a frequency band of the microwave. In this embodiment, the impedance of the surface of the resonator unit can be changed by controlling the frequency of the microwave supplied to the treatment chamber. This makes it possible to control the standing wave distribution within the treatment chamber, that is, the microwave energy distribution within the treatment chamber. As a result, in the cases where a plurality of heating targets need to be heated simultaneously, desired dielectric heating is conducted for each of the heating targets.

Abstract: An energy transfer cooking device accessory is described which includes a plastically deformed metal sheet (and a transformer-like power transfer unit which has a primary circuit and a secondary circuit. The plastically deformed metal sheet is arranged between said primary circuit and said secondary circuit. Simultaneously said plastically deformed metal sheet forms a magnetically permeable coupling point for said primary circuit and said secondary circuit, so that a magnetic flux from said primary circuit to said secondary circuit via said plastically deformed metal sheet is guaranteed. Furthermore, a method of manufacturing an energy transfer cooking device accessory and a cooking device are described.

Abstract: A household or commercial appliance includes a couple magnetrons having relative anodes and cathodes, and a power unit comprising a high voltage circuit. The high voltage circuit comprises: a high voltage transformer comprising a primary winding connected to an alternating voltage source and a secondary high-voltage winding providing an alternating high voltage having a period comprising two half periods, a couple of half-wave voltage doubler circuits, and first and second unidirectional conducting devices. The first and second unidirectional conducting devices being configured to cause the half-wave voltage doubler circuits to supply, during a period of the alternating high-voltage the doubled high-voltage to the cathode of the respective magnetron alternately.

Abstract: A method comprises connecting a first resonant converter and a second resonant converter in parallel, detecting a first signal indicating a first soft switching process of the first resonant converter and a second signal indicating a second soft switching process of the second resonant converter and adjusting a first switching frequency of the first resonant converter by a first control circuit and a second switching frequency of the second resonant converter by a second control circuit until a load current flowing through the first resonant converter is substantially equal to a load current flowing through the second resonant converter.

Abstract: A heating system for hot water and conditioned air uses electromagnetic energy created by one or more magnetrons operated by high voltage transformers. The heating system includes oil cooled transformers and magnetrons. Using radiators in the form of heat exchangers, heat recovered from the transformers and magnetrons is dissipated directly into the path of the return air and the air handler blower. The magnetron heating system includes a coiled conduit sized to allow complete heating of the fluid flowing therethrough. The conduit has a conical shape to allow upper magnetrons to heat the outside of the conduit and lower magnetrons to heat the inside of the conduit.

Abstract: A microwave heating device enhances heating efficiency by a simple configuration. A microwave is led from one end of a conductive heating chamber in direction d2. The heating chamber is provided with an opening. A pair of conveying members are provided. A member to be heated sandwiched between the conveying members is moved in direction d1, and passes through the opening in direction d1 non-parallel to microwave traveling direction d2.

Abstract: A microwave source system 1 extracts power in a predetermined microwave frequency band out of thermal noise power generated by a resistor (3) by using filter means (4), amplifies the power through a first amplifier (5) and a second amplifier (7), and outputs the power. The first amplifier (5) is variably controllable in gain and control means (6) controls the gain in such a way as to maintain the intensity of the microwave power output from the first amplifier 5 at a predetermined constant value. The second amplifier (7) has a predetermined gain. The resistor (3) is attached to one of the first amplifier (5) and the second amplifier (7), for example, to the second amplifier (7). Thereby, the resistor (3) receives heat from the amplifier (7). Output of the microwave source system (1) is supplied to, for example, a microwave discharge lamp (2). The microwave source system (1) having the above configuration can be compact and inexpensive without a need for a magnetron or a high voltage power supply.

Abstract: A microwave oven is provided. A component generating relatively high temperature heat and a component generating a relatively low temperature heat are cooled by airflow divided and provided by a cooling part, thereby improving operation reliability and durability of a product.

Abstract: According to the present invention, a microwave generator includes a variable voltage provided from a first transformer to a second transformer having a secondary winding split into a filament winding cathode low AC signal and a secondary winding providing a high voltage which is doubled and rectified in a half-wave voltage doubler for providing a pulsed DC signal through a ballast resistor to a magnetron anode responsive to an electromagnetic field. In still further accord with the present invention, a microwave sample cavity includes a waveguide, and a hole for receiving a sample to be microwave-heated, and an inductive tuning post all on a straight line, wherein the hole is adjacent the waveguide and the post is distant from the waveguide.

Abstract: A transformer assembly for a microwave oven having a magnetron, including a transformer to apply voltage to the magnetron of the microwave oven; a container receiving the transformer therein and having a base plate coupled to the microwave oven and a cover body coupled to the base plate; and a cooling material contained in the container to cool the transformer.

Abstract: A microwave oven to prevent a side plate of a cabinet from vibrating due to an electromagnetic field which is generated around a high-voltage transformer installed in a machine room. An anti-vibration plate is provided at a predetermined position inside the side plate of the cabinet so as to prevent the side plate from vibrating due to the electromagnetic field. The anti-vibration plate extends from a rear wall of the machine room so as to be adjacent to the side plate at a position between the high-voltage transformer and the side plate. Further, the anti-vibration plate is integrated with the rear wall of the machine room, and is screwed to the side plate. The anti-vibration plate has a rectangular shape. An embossment is formed on the anti-vibration plate to reinforce a strength of the anti-vibration plate.

Abstract: The present invention relates to an apparatus and method for controlling output power of a combination hood and microwave oven, and more particularly, to an apparatus and method for controlling power of a combination hood and microwave oven, wherein an output level of a high voltage transformer for generating a high voltage can be adjusted. According to the combination hood and microwave oven of the present invention, the electric power supplied to the high voltage transformer can be increased by temporarily turning off the parts (limited to the components which can be controlled separately from the microwave oven function), such as the vent fan or the electric indicator lamp, having large power consumption. Thus, the output power level thereof can be increased. Therefore, there are advantages in that the quick cooking can be made and cooking performance can be improved due to the high output of the transformer, when the user intends to make the quick cooking with the high output power.

Abstract: This invention provides a magnetron high frequency device which includes: a filtering inductor coupled to a positive end of a direct current power supply; a central tap transformer having a central tap end, a first end and a second end; a filtering capacitor; a first switch which is connected in series to the second end of the central tap transformer and connected to a negative end of the direct current power supply; an in-series circuit having a second switch and a second capacitor and coupled to the central tap transformer; a first capacitor connected in-series with the central tap transformer and connected in parallel with the first switch; a rectifying device coupled to a secondary winding of the central tap transformer; and a magnetron coupled to the rectifying device. The first capacitor, the second capacitor and the central tap transformer forms a resonant circuit.

Abstract: A microwave oven to prevent a side plate of a cabinet from vibrating due to an electromagnetic field which is generated around a high-voltage transformer installed in a machine room. An anti-vibration plate is provided at a predetermined position inside the side plate of the cabinet so as to prevent the side plate from vibrating due to the electromagnetic field. The anti-vibration plate extends from a rear wall of the machine room so as to be adjacent to the side plate at a position between the high-voltage transformer and the side plate. Further, the anti-vibration plate is integrated with the rear wall of the machine room, and is screwed to the side plate. The anti-vibration plate has a rectangular shape. An embossment is formed on the anti-vibration plate to reinforce a strength of the anti-vibration plate.

Abstract: A microwave oven having a high voltage control circuit which prevents an overheating of a high voltage transformer. The high voltage control circuit includes a thermostat which is turned on or off according to a temperature of the high voltage transformer. The thermostat is disposed between a first fixed terminal of a tap formed at a primary coil of the high voltage transformer and a second fixed terminal connected to a power stage, so as to allow the primary coil to have different numbers of turns. According, where the output of a magnetron of the microwave oven becomes high and the temperature of the high voltage transformer reaches a predetermined temperature, the thermostat is turned off, thus enabling the first and second fixed terminals to be disconnected from each other.

Abstract: The present invention relates to a microwave oven, and more particularly, to an outfit plate fitting structure in a microwave oven which has an easy fasting works and reduced components.

Abstract: A transformer for a microwave oven capable of preventing quality deterioration thereof due to damaged insulating paper, includes a first core having a coil inserting section having one open side; a plurality of coils sequentially inserted into the coil inserting section in an inter-electrically insulated state; a second core coupled,to the first core, and for covering the open side of the coil inserting section; and a resin molding section formed to cover the whole area of the plurality of coils.

Abstract: Disclosed is a parts arrangement structure for a DC microwave oven which is formed by a combination of an upper panel, a lower panel and a rear panel, a space inside the DC microwave oven being divided into a device chamber in which a magnetron and an air guide are placed and a cooking chamber in which a rotating motor for rotating rollers and a turntable is placed, the DC microwave oven having a control panel which closes a front end of the device chamber. The parts arrangement structure comprises a high voltage transformer and an inverter circuit board mounted to the lower panel inside the device chamber; and at least one high voltage capacitor mounted to the lower panel below the cooking chamber.

Abstract: A microwave oven having a body casing forming a cooking chamber, an outer casing enclosing the body casing, and a magnetron for supplying the cooking chamber with microwaves is provided. The microwave oven includes a plurality of high-voltage transformers installed in series between the top of the body casing and the outer casing, each high-voltage transformer supplying the high voltage to the magnetron. With this configuration, the height for installing the high-voltage transformer is lowered, so the cooking chamber can be extended to a rear area of the control panel to thereby increase the size of the cooking chamber. The heat generated from the component chamber can be effectively discharged outside, and turns of a winding for the high-voltage transformer can be decreased, thereby reducing the cost of production.

Abstract: A non-directional frequency generator inputs direct current power and outputs alternating current power. A high voltage transformer inputs the alternating current power, and either induces a higher voltage for driving the magnetron, or induces and outputs a commonly used alternating current power. A button inputting section includes a microwave oven operating button for driving the magnetron, and a voltage supplying button for supplying the commonly used alternating current power. A microcomputer applies the higher voltage of the high voltage transformer to the magnetron when there is a button input through the microwave oven operating button, while outputting the commonly used alternating current power when there is a button input through the voltage supplying button. Further, a socket outlet is formed on the body of the microwave oven, through which the commonly used alternating power generated at the microwave oven is supplied.

Abstract: Disclosed is a parts arrangement structure for a DC microwave oven which is formed by a combination of an upper panel, a lower panel and a rear panel, a space inside the DC microwave oven being divided into a device chamber in which a magnetron and an air guide are placed and a cooking chamber in which a rotating motor for rotating rollers and a turntable is placed, the DC microwave oven having a control panel which closes a front end of the device chamber. The parts arrangement structure comprises a high voltage transformer and an inverter circuit board mounted to the lower panel inside the device chamber; and at least one high voltage capacitor mounted to the lower panel below the cooking chamber.

Abstract: A boosting transformer for a high-frequency heating apparatus includes an insulation member, and a primary winding and a secondary winding formed at the insulation member and mutually isolated by the insulation member, each winding having a width and a thickness as measured when the winding is stacked, the width being smaller than the thickness. As such, the boosting transformer can be reduced in height to readily ensure a distance for insulating locations having therebetween a large potential difference from each other in the transformer's internal structure in designing a structure in which the transformer is attached to a high-frequency heating apparatus. Thus the boosting transformer can be attached to the high-frequency heating apparatus at a location less restrictively and such designing can be facilitated.

Abstract: The magnetron driving control apparatus of a microwave oven and a method thereof by which voltage at output side of a high voltage transformer and voltage of a magnetron are detected by a first and second voltage detecting units and a cooking process status is discriminated according to changes of the voltage at the output side of the high voltage transformer and the voltage of the magnetron to control the driving of the magnetron, such that foodstuff is optimally cooked and an automatic cooking is performed without installment of high priced sensors to thereby reduce the manufacturing cost.

Abstract: A high voltage transformer, especially for use in a microwave oven is provided. The high voltage transformer includes: a primary coil to which a commercial power supply is connected; a secondary coil for inducing a high voltage necessary for driving a magnetron of the microwave oven, with respect to the primary coil; a heater coil for inducing voltage necessary for heating a negative electrode of the magnetron, with respect to the primary coil; a core for forming a common magnetic path for the primary and secondary coils and the heater coil; and an insulation support including a side insulating member disposed between the primary, secondary and heater coils and the core, a bottom insulating member disposed between the bottom of the secondary coil and the core and a lead wire support integrally combined with the side insulating member and the bottom insulating member and formed with holes through which lead wires of the secondary coil pass.

Abstract: A high voltage transformer of a microwave oven has a structure for radiating heat efficiently. The high voltage transformer comprises a core formed of a plurality of iron plates fixed together one after another, a coil wound on the core, and heat radiation fins disposed between the iron plates in such a manner that flange parts of the fins extend outwardly beyond an outer periphery of the core. The heat radiation fins are spaced from the iron plates so as not to be in contact with the iron plates, and are made of a high thermal conductivity material. Portions of the flange parts are bent to form air flow openings that conduct cooling air in close contact with the core.

Abstract: The invention relates to an apparatus and method for operating a turntable motor in a microwave oven. The inventive system includes a transformation of a commercial power supply into a lower voltage power source for application to the turntable motor when the turntable motor is operated in response to a control signal.

Abstract: A microwave oven includes a compartment in which a magnetron and a high-voltage transformer are disposed. The transformer includes coils disposed within a core. The core has holes formed in its underside, which are aligned with respective through-holes formed in a bottom panel of the compartment. Bolts extend upwardly through the through holes and into the holes to secure the transformer directly to the bottom panel.

Abstract: In a high-voltage transformer for the power supply of a magnetron in a microwave oven, of the type comprising a primary coil, a high-voltage secondary coil and a heater secondary coil, the two secondary coils are superimposed by being wound on a casing that comprises three parallel flanges, two flanges for the winding of the high-voltage coil and one additional flange which, with one of the preceding flanges, enables the winding of the heater coil.

Abstract: A control system for a microwave oven having a magnetron unit, a microwave oven using such a control system and methods of making the same are provided, the system being adapted to interconnect a power source to a transformer unit of the magnetron unit to operate the same, the system comprising a unit for determining the actual voltage level of said power source to be utilized at that time and being adapted to interconnect the power source to a particular tap of the transformer unit if the determined power level is above a certain value and to interconnect the power source to another tap of the transformer unit if the determined power level is below the certain value.

Abstract: A high-frequency heating device includes a power converter for converting an electric power from a commercial power source or the like into a high-frequency power, a step-up transformer having a high-voltage winding and a low-voltage winding, a magnetron receiving high-voltage and low-voltage outputs, a resonance circuit connected in series or parallel with the filament of the magnetron, and a control circuit. The control circuit controls the power converter so that the operation frequency of the power converter approximately coincides with the resonance frequency of the resonance circuit at the time of activating the power converter to thereby achieve a rapid start of the oscillation operation of the magnetron while suppressing a high voltage from taking place at the activation time to prevent the possible occurrence of the moding phenomenon.

Abstract: A microwave oven driving circuit for stably driving a microwave oven wherein a certain output of a magnetron can be generated by controlling a microcomputer. First and second comparing portions control a voltage supplied from a power supply portion and an output of the magnetron to increase in stages so as to obtain a normal output of the magnetron. Also, the output of the magnetron is gradually decreased without being too abrupt even if the output of the generating portion must be decreased as cooking is completed, thereby improving durability and cooking efficiency of the microwave oven.