A method for operating a hob for maintaining a state, which exists at the time of activation of the maintaining operation, at a cooking point of the hob with a cooking vessel on it detects a change in temperature of the cooking vessel as a change in state, wherein supplied power and/or a change in temperature of the cooking vessel are evaluated. A maintaining function for maintaining the state, which is indicated at this time, at the cooking point with a cooking vessel placed on it can be triggered. In doing so, the current state at the cooking point is classified as a process at the boiling point of water on the one hand and as a process which is different therefrom or as a process which takes place at a different temperature without a phase transition of water on the other hand.

A cooking system is disclosed which includes a wok for receiving food, the wok being placed on top of a base unit housing a heating element for heating up the wok, a lid substantially covering the wok, at least a portion of the lid being able to rotate relative to the wok, a shaft secured to the rotating portion of the lid, a stirrer pivotally mounted to the shaft, a controller housed in the base unit controlling the heating element and rotations of the shaft and the lid, the rotation of the shaft causing a part of the stirrer to sweep from an edge of the wok to approximately a center of the wok in a low path and return to an edge of the wok in a high path, in the low path the part of the stirrer approximately touching a surface of the wok, in the high path the part of the stirrer being high above and not touching the surface of the wok, and a computing device residing outside of the base unit and signally coupled to the controller, the computing device storing a computer program upon execution instructing the computing device to send operating commands to the controller, the operating commands controlling the heating element and the rotations of the shaft and the lid.

An induction heating device for heating a metal article includes a support plate with an upper surface for receiving the metal article, and a plurality of induction coils, which are arranged concentrically around an axis and are provided at an underside of the support plate. Each induction coil is connected to and selectively powered by a generator, and at least one temperature probe is disposeable on the metal article during heating in order to monitor and control the heating of the article.

An induction heating device for heating a metal article includes a support plate with an upper surface for receiving the metal article, and a plurality of induction coils, which are arranged concentrically around an axis and are provided at an underside of the support plate. Each induction coil is connected to and selectively powered by a generator, and at least one temperature probe is disposeable on the metal article during heating in order to monitor and control the heating of the article.

An apparatus includes a plurality of induction coils that are magnetically coupled to one another, a plurality of heat stations, each respectively coupled to one of the induction coils, a power source, and a power source connected to at least one of the heat stations via at least one power transfer component. When electrical power is applied from the power source to at least one of the heat stations, a magnetic field is induced in the plurality of induction coils via the at least one of the heat stations that is connected to the power source.

Method to control a quasi-resonant inverter (13) in an induction cooking appliance (1) provided with induction heating coil (4). The quasi-resonant inverter (13) comprises a switching device (21) electrically connected to the induction heating coil (4) by a node (20) having a first voltage (VC(t)) which is indicative of the voltage across the power switching device (21). The method comprising the steps of: providing to the switching device (21) an enabling signal (K1) comprising a plurality of pulses, in order to switch-on and switch-off said switching device (21) for a switch-on period (tON) and a switch-off period (tOFF), determining a second voltage (VCmin) indicative of the minimum value of the first voltage (VC(t)) during the switch- off period (tOFF), regulating the switch-off period (tOFF) based on the second voltage (VCmin), and regulating the enabling signal (K1) based on the regulated switch-off period (tOFF).

The present invention relates to an induction heating cooker including a synchronization circuit for a plurality of inverters, comprising: a first inverter including a first switching circuit unit for applying a first power source to a first heating coil, and a first control unit for controlling the first switching circuit unit; and a second inverter including a second switching circuit unit for applying a second power source to a second heating coil, and a second control unit for controlling the second switching circuit unit, wherein the first inverter further includes a first insulated signal transfer unit for controlling an operation of the second switching circuit unit, and the first control unit may match an operating frequency of the second switching circuit unit with an operating frequency of the first switching circuit unit by using the first insulated signal transfer unit.

Provided is an induction heating device with which discharging can be easily avoided even when a large electric current is used. The induction heating device comprises a high-frequency power supply provided with a connection portion for an alternating-current power supply, and a heating coil portion connected to the high-frequency power supply. In the heating coil portion, a plurality of coils include n coils surrounding a cavity portion in a plane, wherein the plurality of coils are mutually connected in series via one of a plurality of capacitors.

A vaporiser system for vaporising a composition includes a first element with at least one radiation source connected to an electrical energy source which is adapted to emit electromagnetic radiation, and a second element with at least one reservoir for holding the composition and at least one absorber. The first and the second element are reversibly and detachably connectable to each other in a non-destructive manner. A radiation conductor is arranged such that a radiation-conducting connection is formed between the radiation source and the absorber when the first element and the second element are connected to each other. The vaporiser system is adapted to vaporise the composition by the thermal energy obtained from the electromagnetic radiation by the absorber via conversion and/or by the electromagnetic radiation with increased wavelength compared to the absorbed electromagnetic radiation which is emitted by the absorber.

A security tag can prohibit unauthorized usage of a device or product. The device may include an electronic nicotine delivery systems (“ENDS”) device, which may include aerosol delivery devices such as smoking articles that produce aerosol. The security tag can prevent usage until authorized. Attempts at usage without authorization can result in the device being unusable. The authorization may include identity confirmation or age verification.