The invention relates to a method for determining properties of the electrical current provided to an induction heating element (2) of an induction cooking appliance (1). The induction cooking appliance (1) has a heating power energy unit (3) including a heating power generator (4) with at least one switching element (5) adapted to provide pulsed electric power to said induction heating element (2). The induction cooking appliance (1) also has an oscillating circuit (6) with at least one resonance capacitor (6.1, 6.2). The induction heating element (2) is electrically coupled with the heating power generator (4) and the oscillating circuit (6). The induction cooking appliance (1) also has a control entity (8), wherein an input of a measurement circuit (9) is coupled with a node of the heating power energy unit (3).

The present disclosure provides a microwave system, including a chamber and a microwave process circuit. The microwave process circuit is coupled to the chamber, and configured to radiate a polarized source microwave, receive a first reflected microwave, and radiate a polarized first reflected microwave into the chamber so as to heat a device under test in the chamber. The microwave process circuit includes a power generator, a first energy feeder, and a second energy feeder. The power generator is configured to generate a source microwave according to a reference signal and a control signal. The first energy feeder is configured to polarized the source microwave to the polarized source microwave, and radiate the polarized microwave into the chamber. The second energy feeder is configured to polarized the first reflected microwave to the polarized first reflected microwave, and radiate the polarized first reflected microwave into the chamber.

A microwave heating device includes 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.

An exemplary semiconductor technology implemented microwave filter includes a dielectric substrate with metal traces on one surface that function as frequency selective circuits and reference ground. Other metal traces on the other surface of the substrate also provide reference ground. Bottom and top enclosures that enclose the substrate have respective interior recesses with deposited continuous metal coatings. A plurality of metal bonding bumps or bonding wall extends outwardly from the projecting walls of the bottom and top enclosures. The bonding bumps on the bottom and top enclosures engage reference ground metal traces on respective surfaces of the substrate. As a result of applied pressure, the bonding bumps and respective reference ground metal traces together with the through-substrate vias form a metal-to-metal singly-connected ground reference structure for the entire circuitry.

A microwave generating system includes a modular architecture which is configurable to provide power output from under 1-kilowatt to over 100-kilowatts. The various power levels are achieved by combining the RF outputs of multiple RF power amplifiers in a corporate structure. The system can be used on any ISM band. Each system component incorporates a dedicated embedded microcontroller for high performance real-time control response. The components are connected to a high speed digital data bus, and are commanded and supervised by a control program running on a host computer.

Embodiments disclosed herein include a housing for a source assembly. In an embodiment, the housing comprises a conductive body with a first surface and a second surface opposite from the first surface, and a plurality of openings through a thickness of the conductive body between the first surface and the second surface. In an embodiment, the housing further comprises a channel into the first surface of the conductive body, and a cover over the channel. In an embodiment, a first stem over the cover extends away from the first surface, and a second stem over the cover extends away from the first surface. In an embodiment, the first stem and the second stem open into the channel.

An electromagnetic cooking device and method of controlling the same is provided herein. The cooking device includes a cavity in which a liquid is placed and a plurality of RF feeds configured to introduce electromagnetic radiation into the cavity for heating the liquid. A controller is provided and is configured to analyze forward and backward power at the plurality of RF feeds to calculate efficiency; determine and monitor a coefficient of variation of the efficiency; detect a heating state in the liquid based on changes in the coefficient of variation; and adjust a power level of the electromagnetic radiation in response to detection of the heating state.

A microwave separated field reconstructed device includes: a microwave field reconstructed cavity, a first short circuit plane, a third waveguide flange and coupling windows, wherein connection ports are provided on four ends of the microwave field reconstructed cavity; the microwave field reconstructed cavity is provided with a first waveguide flange, and a second waveguide flange is provided one end of the microwave field reconstructed cavity perpendicular to the first waveguide flange; the first short circuit plane is connected to one end of the first waveguide flange away from the microwave field reconstructed cavity; a second short circuit plane is connected to one end of the second waveguide flange away from the microwave field reconstructed cavity. The input ports are distributed at two ends of the microwave field reconstructed cavity to introduce electric and magnetic fields.

A microwave treatment device according to one aspect of the present disclosure includes a heating chamber, a microwave generator, an amplifier, a feeder, a detector, a controller, and a storage. The microwave generator generates a microwave having an arbitrary frequency in a predetermined frequency band. The amplifier amplifies the microwave and outputs the amplified microwave as incident microwave power. The feeder supplies the incident microwave power to the heating chamber. The detector detects the incident microwave power and reflected microwave power that returns from the heating chamber to the feeder. The storage stores the incident microwave power and the reflected microwave power in association with the frequency of the microwave and time elapsed since the start of heating. The controller causes the microwave generator to execute a frequency sweep over the predetermined frequency band. The controller controls the microwave generator and the amplifier on the basis of the incident microwave power and the reflected microwave power detected during the frequency sweep.

According to the present aspect, the heating evenness can be improved.

A microwave generator for a microwave device includes a single component carrier for control components and power components, which includes a continuous carrier material. Two power regions and one control region are provided on the component carrier. In the control region, electrically functional components are arranged on both flat sides of the component carrier, while in the power regions, electrically functional components with at least one power switch are arranged only on an upper flat side, heat sinks being arranged on the lower flat side. An RF substrate is provided in regions on the upper flat side of the power region.