A circuit configuration is disclosed for use in an appliance includes a power switch configured to open and close a first group of electrical contacts, where the contacts while closed cause the appliance to energize upon a user initiating a use of the appliance. The circuit configuration also includes a primary timing device electrically connected to the first group of electrical contacts, the primary timing device being actuated upon energization of the appliance and the primary timing device being configured to de-energize the appliance after a first time period by opening the first group of electrical contacts. The circuit configuration also includes a secondary timing device electrically connected to the power switch by a second group of electrical contacts, where the secondary timing device is configured to de-energize the appliance after a second time period, where the second time period is set based on the first time period.

A temperature regulation device for food items includes a food pan, a heating device configured to provide regulated heating of the food pan, a temperature sensor configured to detect a temperature of the food pan, and a control system. The control system is configured to control the heating device in response to at least the temperature of the food pan detected by the temperature sensor by providing a gradual warming control mode in response to the temperature sensor detecting the temperature of the food pan below a minimum preset temperature and providing a normal control mode in response to the temperature sensor detecting the temperature of the food pan above the minimum preset temperature.

A wireless power supply system for a cooking appliance includes a power transmission device and a power reception device. The power transmission device includes a transmission coil and a coil driving circuit coupled to the transmission coil and configured to drive the transmission coil to generate an alternating electromagnetic field and vary a resonance voltage of the transmission coil. The power reception device includes a reception coil matching the transmission coil and configured to sense the alternating electromagnetic field to generate a varying induction voltage signal that varies according to the varying resonance voltage and a communication and demodulation circuit configured to demodulate the varying induction voltage signal to output demodulated data.

An electromagnetically heated cooking utensil, and a heating control circuit and method therefor. The heating control circuit comprises a first resonance device; a second resonance device; a first power switch; a second power switch; a first synchronization device that detects voltages of both ends of the first resonance device to output a first synchronization signal; a second synchronization device that detects voltages of both ends of the second resonance device to output a second synchronization signal; and a control device that selects, according to the heating mode of the electromagnetically heated cooking utensil, the first synchronization signal to generate a driving signal for driving the first power switch, a second synchronization signal to generate a driving signal for driving the second power switch

A cooking apparatus and a controlling method, where the cooking apparatus includes a plurality of power input terminals, a plurality of heaters, a detection circuit connected to the power input terminals for detecting the phase of power input into the power input terminals, and a processor. The processor configured to identify a phase difference of input power based on an electronic signal of the power output from the detection circuit, and, based on the phase difference being within one of a plurality of threshold ranges, identify the voltage between live terminals among the plurality of power input terminals based on the phase difference of the power and control at least one heater among the plurality of heaters according to the identified voltage between the live terminals, and, based on the phase difference being outside the plurality of threshold ranges, stop the operation of the cooking apparatus.

A heater for use in fluid immersion heating includes a plurality of resistive heating elements, and a plurality sets of power pins electrically connected to the plurality of heating elements. Each set of power pins includes a first power pin made of a first conductive material, and a second power pin made of a second conductive material that is dissimilar from the first conductive material of the first power pin. The first power pin is electrically connected to the second power pin to form a junction. The second power pin is electrically connected to the corresponding resistive heating element. The junctions between the first power pins and the second power pins are disposed at different heights in order to sense a level of the fluid.

A heater system includes a plurality of heater cores defining zones, a plurality of power pins extending through each of the heater cores and made of different conductive materials, and at least one jumper connected between two of the plurality of power pins being made of dissimilar materials. The jumper is in communication with a controller to obtain a temperature reading of the heater system proximate the jumper.

Provided is a cooking appliance which includes a concentration sensor for detecting a concentration of a reference substance in which proportional amounts of ingredients change in accordance with progress in cooking an object to be heated; a control unit for determining a cooked state of the object to be heated based on the detected concentration of the reference substance; and a communication unit for transmitting, to an external device which is connected to a home network, information which indicates the cooked state of the object to be heated.

Provided is an apparatus and method for protecting against unsafe electric current conditions. An example method includes accessing a selected operating mode for a heating element of the electric grill using at least one user input device of the electric grill, the heating element connected to a voltage line and a neutral line; measuring, using a temperature probe, a temperature of the heating element; estimating an ambient temperature at a location within a cook box of the electric grill spaced apart from the heating element, the estimation of the ambient temperature based on the measured temperature of the heating element; and using the estimated ambient temperature to determine when a target temperature corresponding to the selected operating mode is reached.

According to one example, a system includes a heat source operable to provide an amount of energy to be used to cook a food item, and further includes one or more processors. The processors are operable to receive an indication of a requested cooking temperature, and to receive a plurality of indications of measured temperature associated with the food item at different times. The processors are further operable to determine an integral term based on differences between the requested cooking temperature and the measured temperatures, to determine a heat loss term based on the integral term, and to determine an energy adjustment based on the heat loss term. The heat source is further operable to modify the amount of energy provided by the heat source in accordance with the determined energy adjustment.