This disclosure relates to a microwave heating device and a method for operating a microwave heating device. The microwave heating device comprises at least two radiating portions that are adapted to radiate microwaves to the heating chamber and can be operated according to a plurality of operational configurations that differ in frequency and/or in phase shift(s) between the radiated microwaves. Data of energy efficiency, as a function of operational configurations, can be obtained for a product in the heating chamber. For example, energy efficiency data are obtained through a learning procedure. The obtained data can be processed to select one or more operational configurations ranking high in energy efficiency and a heating procedure for the product inside the heating chamber can be executed by operating the at least two radiating portions according to the selected one or more operational configurations.

In order to obtain an electromagnetic transmission device and an electromagnetic transmission system that emit high-power continuous microwaves stably onto a material or an irradiation target in electromagnetic heating systems and electromagnetic power transmission systems that are required to emit electromagnetic waves such as high-power microwaves, the electromagnetic transmission device, the power amplification device, and the electromagnetic transmission system emit, onto an irradiation target, electromagnetic waves that are modulated by a repeating pulse with a predetermined transmission duty cycle, or electromagnetic waves that are modulated by a repeating pulse with a predetermined transmission duty cycle and are amplified.

In order to obtain an electromagnetic transmission device and an electromagnetic transmission system that emit high-power continuous microwaves stably onto a material or an irradiation target in electromagnetic heating systems and electromagnetic power transmission systems that are required to emit electromagnetic waves such as high-power microwaves, the electromagnetic transmission device, the power amplification device, and the electromagnetic transmission system emit, onto an irradiation target, electromagnetic waves that are modulated by a repeating pulse with a predetermined transmission duty cycle, or electromagnetic waves that are modulated by a repeating pulse with a predetermined transmission duty cycle and are amplified.

A cooking apparatus includes a cooking chamber, a cooking plate having a visual representation distinguishing a plurality of areas on a top surface of the cooking plate, a plurality of heaters configured to supply heat to the plurality of areas and a controller configured to receive information about a cooking object including a plurality of pieces of food having different cooking conditions, based on the information about the cooking object, determine a first heating intensity to be used to heat the first piece of the food, and a second heating intensity to be used to heat the second piece of the food, control the plurality of heaters to supply heat of the first heating intensity to the first area, and control the plurality of heaters to supply heat of the second heating intensity to the second area.

The microwave power is distributed to microwave radiation elements arranged rotationally symmetrically around a reference line on a plane on a top face side of a heating chamber by advancing a feeding phase with a phase difference of 360°/2N clockwise or counterclockwise in turn.

A selective heating device comprises a chamber configured to contain a target to be at least partially heated, an active electromagnetic (EM) element to generate an electromagnetic field in the chamber and a passive EM element in the chamber. The passive EM element is capable of electromagnetically coupling to the active element. The active EM element and passive EM element are controllable to selectively heat a portion of the target.

A microwave oven avoids being upsized. The microwave oven includes a housing including a cooking chamber inside the housing, a component chamber inside the housing, a first opening in a front portion of the housing and communicating with the cooking chamber, and an outlet in a rear portion of the housing and allowing air to be discharged from the component chamber to flow through the outlet. The microwave oven also includes a heat-generating component in the component chamber, a door at a front portion of the housing to cover and uncover the first opening, and a battery mount at a rear portion of the housing to detachably receive a battery pack.

A food preparation appliance includes a processing mechanism, a thermal element, a sensor positioned to acquire identifying data regarding identifying characteristics of a food product to be processed by the food preparation appliance, and a processing circuit. The processing circuit is configured to receive the identifying data from the sensor, identify a type of the food product based on the identifying data, and automatically set a predefined operating parameter of at least one of the processing mechanism and the thermal element to provide target processing of the food product based on the type and the identifying characteristics.

A microwave oven includes a frequency converter, a magnetron, a first conductor, and a second conductor. A power supply end of the fre-quency converter is connected to a power supply end of the magnetron by means of the first conductor, and a ground end of the frequency converter is connected to a ground end of the magnetron by means of the second conductor. The first conductor and a part of the second conductor are arranged in parallel, and the distance between the first conductor and the part of the second conductor is less than a preset distance. In this way, RE of the microwave oven can be reduced, and the microwave oven can thus meet the EMC standards.

A combination microwave and refrigerator system is provided. The microwave oven is connected to a source of power and has a control circuit for controlling the operation of the microwave oven. A first power supply outlet is provided on the microwave oven. A refrigerator is connected to the source of power by connection to the first power supply outlet. The control circuit is configured to disable the cooling operation of the refrigerator, when the microwave oven demands cooking power, and enable the cooling operation of the refrigerator when the microwave oven is not drawing cooking power. A safety sensor is provided in the microwave oven, and is configured to cause cooking power to the microwave oven to be turned off upon the safety sensor sensing a dangerous condition.