Abstract: An AC/DC microwave oven includes a selecting switch selecting AC or DC input power; a supplier supplying power using a common driving load driven by the DC power, and supplying the AC input power or DC/AC converted power selected by the selecting switch; and a microwave oscillator driven by AC power supplied by the supplier. The AC/DC type microwave oven includes a rectifier rectifying the AC input power into DC power; driving load driven by rectified DC power or DC input power; rotatable inverter including a motor driven by the DC input power, and commutator producing AC power according to the DC input power inputted to one direction which is outputting in two directions by means of input/output brushes contacted with four directions of the commutator and rotated by a motor; and microwave oscillating part driven by the AC power converted by the rotatable inverter or the AC input power.

Abstract: Cooking information (CI) concerning different dishes is preliminarily registered as a standard in a mask ROM (11A) or the like of a microwave oven (1), to enable automatic cooking of a variety of dishes for every user. In practice, however, the dishes which each user cooks by a microwave oven is limited to a few of them. Then, the user selects and registers a standard recipe name (HN) of only his/her favorite dish in the mask ROM into a favorite menu in a non-volatile memory (11B). In order to execute cooking of a desired dish registered in the favorite menu, the standard recipe name of the desired dish is read not from the mask ROM but from the non-volatile memory and displayed on an LCD panel (13), so that the user needs only perform an operation to instruct start of heating through an input unit (15).

Abstract: The object of the invention is to provide a high-frequency heating apparatus which can maximize the input current for the high-frequency heating apparatus while securing a uniform margin relative to the cutoff current, thereby enabling maximized and efficient output of high-frequency waves.

Abstract: A microwave oven and a controlling method therefor employ a data receiving section connected to an external device which is connectable to the Internet to receive cooking data from the external device, and a driving section for performing the cooking operation by using the cooking data received from the Internet. The microwave oven also includes a memory for storing the cooking data received from the Internet. A user can select and cook his/her desired cooking menus from a wide range of cooking menus provided by the Internet, and can also adjust, replace and store the cooking data received from the Internet as he/she pleases.

Abstract: The present invention relates to a damper apparatus for a microwave oven by which the production cost and the reliability of the operation can be obtained by simplifying the structure of a damper apparatus for controlling the air flow supplied into the cavity of a microwave oven, which comprises an air duct for guiding a cooling air from the machinery compartment of the microwave oven into the cavity; a damper rotatably installed in the air duct for opening or closing the air flow in the air duct; a motor which includes a shaft directly connected to the damper to drive the damper; and a micro switch installed at one side of the air duct for detecting the opening and closing states of the damper by contacting one side of the damper.

Abstract: An apparatus is disclosed to include a transmission device 151 having a rule generation device 101 for generating rules, and a data transmission device 102 for converting rules generated by the rule generation device 101 into rule data and for transmitting the rule data. The apparatus also includes a receiving device 152 having a data receiving device 103 for receiving rule data transmitted by the data transmission device 102, a rule conversion device 104 for converting the rule data received by the data receiving device 103 into rules, a rule storage device 105 for storing rules converted by the rule conversion device 104, and a control device 106 for controlling a controlled apparatus, such as a microwave oven, in accordance with the rules stored in the rule storage device 105.

Abstract: The present invention relates to a microwave oven. Though the present invention provides a system in a front surface thereof for air communication between inside and outside of the microwave oven, the number of components for the front surface is minimized. That is, vent grill parts 46 and 56 are formed as one unit with the door 40 and the control panel 50 of the microwave oven for covering vent holes 36 and 36′ in the front surface 34 of a main frame 30 from external view. Top ends of the vent grill parts 46 and 56 are opened for permitting inside and outside of the microwave oven to be in communication through the vent holes 36 and 36′. There may be a louver 48 in the vent grill parts 46 and 56 in correspondence to the vent holes 36 and 36′.

Abstract: A microwave oven includes a hood unit including a hood motor, a magnetron, a transformer having primary and secondary coils, the transformer generating a high voltage in a turn ratio of the primary and secondary coils and supplying the generated high voltage to the magnetron, a hood unit driver for controlling an operation of the hood unit, power output switching means for controlling the level of a voltage to be supplied to the transformer, and a controller for controlling the power output switching means to control the level of the voltage to be supplied to the transformer according to a given operation mode of the hood unit. The power output level of the microwave oven is automatically controlled according to a given operation mode of the hood motor such that the sum of the oven power output and the hood motor power output is constant.

Abstract: The present invention relates to a microwave oven. Though the present invention provides a system in a front surface thereof for air communication between inside and outside of the microwave oven, the number of components for the front surface is minimized. That is, vent grill parts 46 and 56 are formed as one unit with the door 40 and the control panel 50 of the microwave oven for covering vent holes 36 and 36′ in the front surface 34 of a main frame 30 from external view. Top ends of the vent grill parts 46 and 56 are opened for permitting inside and outside of the microwave oven to be in communication through the vent holes 36 and 36′. There may be a louver 48 in the vent grill parts 46 and 56 in correspondence to the vent holes 36 and 36′.

Abstract: A food amount detector for automatically detecting the amount of a food placed in a cooking chamber of a microwave oven, a microwave oven employing the food amount detector, and control method thereof. Output voltage of a microwave generator is detected while the microwave oven is driven, and the amount of the food placed in the cooking chamber of the microwave oven is determined based on the output voltage such detected. In accordance with the amount of the food such determined, the food is cooked under the appropriate driving conditions of the microwave oven. Accordingly, the user does not need to determine the amount of the food by himself, or set the driving conditions of the microwave oven such as cooking time, level of microwave energy, etc. As a result, the user finds it convenient when using this microwave oven, and the food is cooked under the exact driving conditions set by the microwave oven.

Abstract: Disclosed is a microwave oven including a magnetron, a power supply part supplying an AC power and a high voltage transformer generating a high voltage with the AC power from the power supply part, comprising a power controller part interrupting the power supply to the magnetron where it is determined that the voltage of the power supplied from the power supply part is lower than a predetermined allowable lower limit voltage. With this configuration, application of the voltage lower than the allowable lower limit voltage can be prevented, and in addition, the stability of the circuit can be enhanced.

Abstract: Disclosed is a method for controlling a microwave oven including a power supply part supplying an AC power, a high voltage transformer generating a high voltage with the AC power generated from the power supply part, a magnetron generating electromagnetic waves with the high voltage generated from the high voltage transformer, and a control signal generator part supplying a control signal to the magnetron, the method comprising the steps of setting up a reference oscillation time; measuring the time when the magnetron starts being oscillated according to the control signal; comparing the reference oscillation time with the oscillation start time; and adjusting a pulse width of the control signal where the reference oscillation time is longer than the oscillation start time.

Abstract: A microwave oven includes a main casing with a cooking chamber, a door for opening and closing the cooking chamber, and a magnetron in the main casing, for heating food within the cooking chamber. The microwave oven further includes a power supply part, a first door switch closed while the door is closed to supply electric power from the power supply part into the magnetron, a monitor switch connected in series to the first door switch, being operated in reverse relative to the opening and closing of the first door switch, and a control part determining that the first door switch is in trouble where the first door switch and the monitor switch are not operated in reverse to each other, and preventing the electric power from being supplied into the magnetron when the door is opened while the first door switch and the monitor switch are both closed.

Abstract: A data obtaining method for a microwave oven for processing a cooking status of food detected by a sensor into data, including the steps of: detecting data from food for a predetermined time period; calculating a summation of the detected data; and subtracting data about characteristics of the microwave oven which are prestored in the microwave oven from the detected data.

Abstract: A microwave control unit that includes an external memory storage for storing, for example, control parameters, cooking parameters, and feature data is described. In one embodiment, the control unit includes a pre-programmed microprocessor coupled to a key panel and a display. The controller also is coupled, for example, to a power supply, sensors, and power switches. The control microprocessor, as is known in the art, includes an on-board memory unit, e.g., a read only memory, for storing the control program as well as control parameters, cooking parameters, and feature data. Under the control of the control program, the microprocessor is configured to control, for example, energy output levels and cooking time based on the operator inputs. The control unit also includes an external model configuration read only memory (EMCR) coupled to the control microprocessor via an external bus. The EMCR also has control parameters, cooking parameters, and feature data stored therein.

Abstract: Disclosed is a microwave oven capable of cooking food according to an output mode in response to an output level of its magnetron, including a fan motor having a low-speed node and a high-speed node to receive power, and having a turning speed variable in response to a node connecting state; an output mode selecting part through which one of output modes is selected; a switching part having at least one switch for switching power applied to the low-speed node or high-speed node of the fan motor; and a control unit controlling the switching part in response to an output mode selected by the output mode selecting part, thus preventing its electrical components from being overheated.

Abstract: For residential use primarily, a compact quick-cooking convection oven for cooking a food product at least partially by hot gas flow, includes a housing defining (i) a cooking chamber having a top, a bottom and a support means therebetween and spaced above the chamber bottom for receiving and supporting a food product for cooking, and (ii) conduit means for providing gaseous communication outside of the cooking chamber upwardly from the chamber bottom to the chamber top. Associated with the cooking chamber are (i) adjacent the chamber top, directing means for directing gas flow from the conduit means downwardly onto a top of the food product on the support means, and (ii) adjacent the chamber bottom, return means for directing the gas flow from the cooking chamber into the conduit means. Flow means cause gas flow from the directing means via the conduit means.

Abstract: Damping device in a microwave oven including an air duct on an electrical compartment side of a partition wall for guiding an air flow from a cooing fan to a cooking chamber, a damper rotatably hinged on the air duct for selectively blocking the air duct, a driving cam having a relative thickness difference between a thick portion and a thin portion, rotatable in contact with one end of the damper for pressing the one end of the damper to rotate the damper centered on the hinge owing to the thickness difference, and control means for controlling rotation of the driving cam, thereby providing a smooth damping operation, reducing a device cost, and preventing the microswitch from being pressed excessively.

Abstract: A domestic appliance is described having the ability to connect to the Internet. An appliance, such as a microwave oven, is equipped with a touch-screen display on its door. The display connects to a communication system, such as a miniature personal computer having a modem and a web browser. The display is mounted on the door of the appliance through mounting hardware and an adaptor.

Abstract: A programmable cooking system including a plurality of programmable cooking devices and at least one data key. The, or each, data key is provided with a data memory for storing program data corresponding to sequences of cooking operations, and the data memory is divided into a plurality of parts each corresponding to a respective one of the cooking devices. Each programmable cooking device includes a programmable control means for controlling the cooking device to carry out sequences of cooking operations each of which may use a different cooking power and cooking time duration. Each programmable cooking device further includes a key aperture adapted to receive one of the data keys and a data reader arranged to read from the data key program data from that part of the data memory corresponding to the cooking device, and pass the program data to the programmable control means of the cooking device thus making the appropriate sequences of cooking operations available to the cooking device.

Abstract: A power supply apparatus including: a power supply unit receiving a common AC power and generating a DC power; a constant voltage generator receiving the DC power and outputting a pre-set rated DC voltage; a controller receiving the rated DC voltage and outputting a control signal; and an outputting unit receiving the DC power to the rated DC voltage and being operated according to the control signal. As the single DC power converted from the common AC power is supplied to the peripheral circuit units of a microwave oven, the peripheral circuit units are controlled accordingly. And, since the single power is used, the power supply circuit is simple, contributing to lower down a product cost.

Abstract: The present invention relates to an automatic cooking of a microwave oven, in particular to an automatic cooking compensation apparatus of a microwave oven and a method thereof which is capable of solving a port number restriction problem of a microcomputer when data compensation corresponding to automatic cooking time is performed. The present invention can have data variable port as same as line number of a key matrix by using the data variable port for the cooking time compensation in conjunction with key input ports, accordingly the cooking data can be compensated as same as the number of line. In other words, data variable value inputs from four˜five up to eight are possible within the range permitted by the key matrix, accordingly the present invention is capable of varying all the automatic cooking data set in advance with low material expense and a simple hardware construction.

Abstract: There is described a hybrid furnace comprising a microwave source, and an enclosure for the confinement of both microwave and RF energy for containing an object to be heated. The microwave source is coupled to the enclosure. The furnace further includes an RF source coupled to the enclosure, and a controller for controlling the quantity of microwave energy and RF energy to which the object to be heated is exposed. There is also described a method of operating a furnace of the above type to the heat an object. The microwave source is actuated to induce an electric field to heat the object and the RF source is controlled to selectively provide an oscillating electric field within the object to be heated at a location at a temperature where the field strength of the microwave-induced electric field falls below a predetermined threshold value.

Abstract: A microwave oven comprises a main casing with a cooking chamber, a door for opening and closing the cooking chamber, and a magnetron in the main casing, for heating food within the cooking chamber. The microwave oven further comprises a power supply part, a first door switch closed while the door is closed to supply electric power from the power supply part into the magnetron, a monitor switch connected in series to the first door switch, being operated in reverse relative to the opening and closing of the first door switch, and a control part determining that the first door switch is in trouble where the first door switch and the monitor switch are not operated in reverse to each other, and preventing the electric power from being supplied into the magnetron when the door is opened while the first door switch and the monitor switch are both closed.

Abstract: A food amount detector for automatically detecting the amount of a food placed in a cooking chamber of a microwave oven, a microwave oven employing the food amount detector, and control method thereof. Output voltage of a microwave generator is detected while the microwave oven is driven, and the amount of the food placed in the cooking chamber of the microwave oven is determined based on the output voltage such detected. In accordance with the amount of the food such determined, the food is cooked under the appropriate driving conditions of the microwave oven. Accordingly, the user does not need to determine the amount of the food by himself, or set the driving conditions of the microwave oven such as cooking time, level of microwave energy, etc. As a result, the user finds it convenient when using this microwave oven, and the food is cooked under the exact driving conditions set by the microwave oven.

Abstract: The present invention provides an adaptive microwave oven capable of entering an operation mode which avoids interference with a communication device either upon detection of a communication from a communication device (e.g., a cordless telephone) operating in a microwave frequency range, or upon receipt of a command indicating the operation of a microwave device such as a cordless telephone through a suitable network (e.g., a piconet using BLUETOOTH Technology). In one embodiment, a cooking mode of a microwave oven is paused (or significantly reduced) to best avoid interference with microwave signals between a remote handset and a matching base unit of a cordless telephone. The activity of microwave communications within the vicinity of the adaptive microwave oven can be determined, e.g., using a passive cordless telephone receiver which detects communication activity in the microwave range, or using direct communications from the cordless telephone using a suitable wireless network, e.g.

Abstract: A microwave oven with an apparatus for detecting life time of components detects a frequency of opening and closing of a door switch even when AC power supply is cut-off, and detects a driving time of a high voltage transformer or a magneton according to their driving status, and accumulates and stores the detected driving time in a memory. The microwave oven includes a high frequency generation detecting portion connected to a high frequency generating portion for detecting driving status of high frequency generating components such as the high voltage transformer or the magnetron, and a door opening/closing detecting portion for detecting opening and closing of the door. A microcomputer counts the driving time of We high frequency components and the frequency of door opening and closing, and accumulates and stores the counted result in the memory.

Abstract: A method for detecting abnormal operation state of parts of a microwave oven including a memory, a plurality of heaters and cooling fans is provided, which includes the steps of extracting cooking data selected by a user from the memory, driving the cooling fan according to the extracted cooking data, determining whether or not to drive the heaters according to whether a driving current of the cooling fan is higher than a first preset current or not and detecting an abnormal state of the cooling fan, and determining whether or not to advance the cooling according to whether a driving current of the heaters is higher than a second preset current as the heaters are driven, and detecting an abnormal state of the heaters, so that the damage of parts or danger of fire of the microwave oven due to the malfunction of the parts may be prevented in advance, and the state of the microwave oven may be recognized in a remote place by using internet instead of visiting of a service member, since the malfunction may be che

Abstract: A heating chamber has a width in a direction of a two-head arrow X, a depth in a direction of a two-head arrow Y and a height in a direction of a two-head arrow Z. An infrared sensor includes 25 infrared detection elements each having a field of view. Since the 25 infrared detection elements are arranged, five by five in directions Y and Z, on the heating chamber's bottom plate there are projected a total of 25 fields of view, five by five in directions Y and X. Thus the bottom plate has any area thereof covered by one of the 25 fields of view.

Abstract: A rotary nozzle device has:

Abstract: Disclosed is a microwave oven, including a power supply part supplying a commercial AC power, a rectifier and filter part rectifying and filtering the commercial AC power, a high voltage transformer generating a high voltage with the DC power from said rectifier and filter part, a magnetron generating electromagnetic waves by the high voltage supplied from said high voltage transformer. The microwave oven further includes a control signal generator part generating a control signal; an inverter part converting the DC power supplied from said rectifier and filter part into an AC power with a high voltage; and a control part determining whether said control signal converted by said high voltage transformer is within a predetermined range, and preventing said control signal from being applied to said magnetron where the control signal is determined to be beyond the predetermined range.

Abstract: A microwave oven comprising a main body formed with a cooking compartment, an outer casing surrounding the main body, to define an outer appearance of the microwave oven, a grill member provided between the main body and the outer casing, having a number of air passing holes, and a grill cover rotatably provided in front of the grill member, opening and closing the grill member, further comprising a main cam rotatably contacting with a rear face portion of the grill cover; a motor moving the main cam; and a switch sensing a rotational position of the main cam, the rotational position of the main cam being controlled to control the opening/closing operation of the grill cover when the motor operates. With this configuration, the switching operation is facilitated, the range of switching operation is constant, and the cost of production is reduced.

Abstract: In order to more accurately control the radiation characteristics of microwaves to improve the controllability of processing in radial and circumferential directions of an article, there are disclosed a microwave applicator and a plasma processing apparatus using the applicator, which comprise a circular waveguide having a surface provided with a plurality of slots for radiating microwaves, wherein the centers of the plurality of slots are offset in a direction parallel to the surface with respect to the center of the circular waveguide.

Abstract: A microwave oven is installed above a cooking counter such as a kitchen stove counter. The microwave oven has its housing covered by an oven case, and incorporates a fan. By driving the fan, the microwave oven can have the hot air generated at the cooking counter inhaled from beneath the oven case and discharged from a front opening. The front opening is formed at the front face of the oven case. An operation display device is provided at the front face of the oven case. By one operation of a predetermined key on the operation display device, the drive of the fan is initiated and then automatically terminated at an elapse of a predetermined time (for example, 10 minutes).

Abstract: The present invention provides an adaptive microwave oven capable of entering an operation mode which avoids interference with a communication device either upon detection of a communication from a communication device (e.g., a cordless telephone) operating in a microwave frequency range, or upon receipt of a command indicating the operation of a microwave device such as a cordless telephone through a suitable network (e.g., a piconet using BLUETOOTH Technology). In one embodiment, a cooking mode of a microwave oven is paused (or significantly reduced) to best avoid interference with microwave signals between a remote handset and a matching base unit of a cordless telephone. The activity of microwave communications within the vicinity of the adaptive microwave oven can be determined, e.g., using a passive cordless telephone receiver which detects communication activity in the microwave range, or using direct communications from the cordless telephone using a suitable wireless network, e.g.

Abstract: A halogen heater control apparatus of a microwave oven and a method thereof, comprises a plurality of halogen heaters which are connected to a utility AC power source, and a halogen heater switching unit. The halogen heater and incrementally alters infrared wavelengths from the halogen heater, and a microcomputer controls the operation of the halogen heater switching unit. The present invention is capable of optimum foodstuff heating and cooking by incrementally altering and controlling the infrared wavelengths from the halogen heater by controlling the utility AC power source duty cycle to the halogen heater in accordance with control signals generated by the microcomputer.

Abstract: A microwave control unit that includes an external memory storage for storing, for example, control parameters, cooking parameters, and feature data is described. In one embodiment, the control unit includes a pre-programmed microprocessor coupled to a key panel and a display. The controller also is coupled, for example, to a power supply, sensors, and power switches. The control microprocessor, as is known in the art, includes an on-board memory unit, e.g., a read only memory, for storing the control program as well as control parameters, cooking parameters, and feature data. Under the control of the control program, the microprocessor is configured to control, for example, energy output levels and cooking time based on the operator inputs. The control unit also includes an external model configuration read only memory (EMCR) coupled to the control microprocessor via an external bus. The EMCR also has control parameters, cooking parameters, and feature data stored therein.

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 normal position detecting mechanism of a functional component in a heating apparatus, comprising: a drive member mounted on the functional component side of the heating apparatus; a driven unit assembly mounted on a main body side of the heating apparatus; and a switch for generating a detection signal; said driven unit assembly comprising: a switch actuating member disposed in a back side of a flat wall surface of the main body side; a mounting bracket for operatively supporting the switch actuating member so as to be movable between the back side of the flat wall surface and the switch for generating the detection signal; and a bias member disposed between the mounting bracket and the switch actuating member, which applies a bias force for normally driving the switch actuating member against the switch for generating the detection signal; wherein the drive member is located in a position facing to the switch actuating member with the flat wall surface of the main body side sandwiched therebet

Abstract: A driving controlling apparatus of a hood motor, including: hood motor means rotatably driven for ventilating the inner portion of a system; main controlling means for generating control signals for controlling the operation of the hood motor; sub-controlling means for controlling the driving of the hood motor by sensing temperature changes in the system; and driving circuit means for controlling the driving of the hood motor in accordance with the control signal of the main controlling means and the driving controlling of the sub-controlling means.

Abstract: A data obtaining method for a microwave oven for processing a cooking status of food detected by a sensor into data, including the steps of: detecting data from food for a predetermined time period; calculating a summation of the detected data; and subtracting data about characteristics of the microwave oven which are prestored in the microwave oven from the detected data.

Abstract: A microwave oven comprises a main casing with a cooking chamber, a door for opening and closing the cooking chamber, and a magnetron in the main casing, for heating food within the cooking chamber. The microwave oven further comprises a power supply part; a plurality of contact parts provided to the main casing to be spaced from each other, being electrically connected to the power supply part; and a conductive part provided at the door, being electrically connected to the contact parts. With this configuration, the necessary components are decreased in number and the circuit is simplified in structure, thereby saving the cost of production and further improving the stability of the circuit.

Abstract: Door to a microwave oven including a door panel which forms a frame of the door, a front panel fitted to a front face of the door panel, a door frame fitted to rear face of the door panel, and a control part fitted between the front panel and the door frame for receiving a work order from a user, controlling an electric component, and indicating various information, thereby permitting handling of the door and servicing to the control part easy, and preventing damage to the first cable.

Abstract: Disclosed is a wall-mounted type microwave oven including a main body having a suction grill for an air passageway to a cavity, a hood duct for a second air passageway for fumes and smoke generated from a gas range placed below the microwave oven, a hood inlet port and outlet port coupled to the hood duct, a hood fan installed within the hood duct of the main body, and discharging air drawn in through the suction port and the hood inlet port, through the hood outlet port, a louver opening and closing the suction grill, a louver driving motor driving the suction louver, a hood switch turning on over a predetermined temperature, and activating the hood fan, and a hood driving circuit part activating the louver driving motor so as to open the louver depending upon a turn-on state of the hood switch.

Abstract: A food amount detector for automatically detecting the amount of a food placed in a cooking chamber of a microwave oven, a microwave oven employing the food amount detector, and control method thereof. Output voltage of a microwave generator is detected while the microwave oven is driven, and the amount of the food placed in the cooking chamber of the microwave oven is determined based on the output voltage such detected. In accordance with the amount of the food such determined, the food is cooked under the appropriate driving conditions of the microwave oven. Accordingly, the user does not need to determine the amount of the food by himself, or set the driving conditions of the microwave oven such as cooking time, level of microwave energy, etc. As a result, the user finds it convenient when using this microwave oven, and the food is cooked under the exact driving conditions set by the microwave oven.

Abstract: A method of microwave assisted chemistry is disclosed in which power can be supplied more continuously at preferred power levels to more precisely control or moderate a chemical reaction. The method comprises measuring the duty cycle required to maintain a measured selected parameter of a sample at a predetermined set point while the sample is being exposed to microwave radiation at a first predetermined power level; and moderating the duty cycle and the applied microwave power to increase the on time of the duty cycle while applying power at a second predetermined power level that is sufficient to maintain the sample at the set point using the moderated duty cycle. A corresponding device for microwave assisted chemistry is also disclosed and comprises a cavity for receiving a sample, a waveguide connected to the cavity, a source of microwave radiation connected to the waveguide, and a switching power supply for driving the source of microwave radiation.

Abstract: A rotary nozzle device has

Abstract: A burn-in apparatus for burning in a transistor used in a microwave region including a burn-in frequency signal source for supplying a signal lower in frequency than the operating frequency of the transistor and higher in frequency than the response frequency of impurities in the transistor, an input matching circuit connected between the signal source and an input of the transistor, and an output matching circuit including a load and connected to an output of the transistor.

Abstract: An oven for cooking a food product, at least partially by hot gas flow and at least partially by microwave energy, includes a housing defining a cooking chamber for receiving a food product for cooking, and a conduit for providing gaseous communication outside of the cooking chamber, between the chamber bottom and the chamber top, the conduit also serving as a hot gas plenum. Preferably the conduit has a free volume of space less than the free volume of space of the cooking chamber, and the oven has custom cooking and/or custom finishing capabilities.

Abstract: A method for compensating cooking time of a microwave oven which sets an exact reference voltage and automatically controls cooking time in accordance with variation of an input voltage, includes the steps of: setting the reference voltage based on the input voltage regulated to a rated voltage in a state that power is applied or a load is driven and storing the reference voltage in a memory; checking a level of a currently input voltage; and calculating compensating time in accordance with a difference value between the currently input voltage and the reference voltage. Thus, it is possible to minimize dissatisfaction of a user due to voltage variation.