Abstract: Provided is a resonant power conversion apparatus including a gate control circuit that controls a first switch to enter an On state and a second switch to enter an Off state at a first stage and controls the first switch to enter the Off state and the second switch to enter the On state at a second stage, a first current transformer that applies current to the first switch at the first stage and applies current to the second switch at the second stage, a load connected to the first current transformer in series, a second current transformer connected to the second switch, and a microcontroller unit (MCU) that determines whether to be zero voltage switching or non-zero voltage switching based on a current flowing in the first current transformer and the second current transformer in a process of transitioning from the first stage to the second stage.

Abstract: A method is provided for operating a resonant power conversion apparatus The method may include charging a capacitor connected to a power source in parallel, and determining a discharge time point and a discharge period of a discharge circuit, where the discharge circuit includes a resistor and a switch connected in series and is connected to the capacitor in parallel. The method may also include outputting, by a switch control circuit, a switch control signal by determining the switch control signal based on the discharge time point and the discharge period, and discharging the charged capacitor through the resistor based on the switch control signal applied to the switch. A resonant power conversion apparatus for performing the above-described method is provided.

Abstract: An oven includes a housing that defines a cavity therein, a radio wave generator coupled to the housing and configured to generate a radio wave to be transmitted to the cavity, a control unit electrically connected to the radio wave generator and configured to determine radio wave information related to an intensity, a phase, and a frequency of the radio wave to be generated by the radio wave generator, and a plurality of antennas electrically connected to the radio wave generator and configured to allow the radio wave to be radiated into the cavity. The plurality of antennas are spaced apart from one another, and the control unit is configured to determine the radio wave information for each of the plurality of antennas.

Abstract: An induction heating type cooktop includes a case, an upper plate coupled to a top of the case and configured to support an object, a working coil disposed inside the case and configured to heat the object, a thin film arranged at a top surface of the upper plate or a bottom surface of the upper plate, at least one temperature sensor configured to measure a temperature of at least one of components of the induction heating type cooktop, the components including the thin film, and a microcontroller unit (MCU) configured to drive the working coil and to control an output of the working coil based on whether the temperature satisfies at least one condition that is preset for the at least one of the components.

Abstract: An induction heating type cooktop includes a case, an upper plate coupled to a top of the case and configured to support a target heating object, a working coil disposed inside the case and configured to heat the target heating object, a thin film disposed at a top surface of the upper plate or a bottom surface of the upper plate, and an insulator disposed between the bottom surface of the upper plate and the working coil. The thin film includes a plurality of sub-thin films that are arranged about a central portion of the working coil. Each of the plurality of sub-thin films defines a closed loop surrounding the central portion of the working coil. The thin firm further includes a heat conduction member that is arranged in a predetermined pattern and contacts at least one of the plurality of sub-thin films.

Abstract: A method is provided for operating a resonant power conversion apparatus The method may include charging a capacitor connected to a power source in parallel, and determining a discharge time point and a discharge period of a discharge circuit, where the discharge circuit includes a resistor and a switch connected in series and is connected to the capacitor in parallel. The method may also include outputting, by a switch control circuit, a switch control signal by determining the switch control signal based on the discharge time point and the discharge period, and discharging the charged capacitor through the resistor based on the switch control signal applied to the switch. A resonant power conversion apparatus for performing the above-described method is provided.

Abstract: A transfer connector for a cooking appliance includes a body that extends in a first direction and defines a hollow portion therein, a base that is coupled to the body and defines a communication hole in communication with the hollow portion, an electric connection part electrically connected to an external power source and extended in the first direction and penetrating through the hollow portion and the communication hole, and a dielectric material disposed in the hollow portion between an inner circumferential surface of the body and an outer circumferential surface of the electric connection part. The inner circumferential surface of the body surrounds the dielectric material, and the dielectric material surrounds the outer circumferential surface of the electric connection part.

Abstract: Provided is a resonant power conversion apparatus including a gate control circuit that controls a first switch to enter an On state and a second switch to enter an Off state at a first stage and controls the first switch to enter the Off state and the second switch to enter the On state at a second stage, a first current transformer that applies current to the first switch at the first stage and applies current to the second switch at the second stage, a load connected to the first current transformer in series, a second current transformer connected to the second switch, and a microcontroller unit (MCU) that determines whether to be zero voltage switching or non-zero voltage switching based on a current flowing in the first current transformer and the second current transformer in a process of transitioning from the first stage to the second stage.

Abstract: A microwave heating system includes: a power supply; a first semiconductor module configured to receive power from the power supply and to generate a first microwave; a second semiconductor module configured to receive power from the power supply and to generate a second microwave; a heating chamber that is configured to accommodate an object at an inside of the heating chamber and that allows transmission of the first microwave and the second microwave to the inside of the heating chamber; and a control unit. The control unit is configured to control operation of each of the first semiconductor module and the second semiconductor module, and to control at least one of a frequency, a phase, or a magnitude of each of the first microwave and the second microwave to increase a heating uniformity of the object.

Abstract: An induction heating type cooktop includes: an upper plate coupled to a top of a case, the upper plate being configured to support a target object, a working coil provided in the case and configured to heat the target object, a thin film disposed on at least one of a top of the upper plate or a bottom of the upper plate, a first temperature sensor configured to measure a temperature of the thin film, a second temperature sensor configured to measure a temperature of the upper plate, and a controller. The controller is configured to control the working coil to heat the target object based on a target output, and control an output of the working coil based on the measured temperature of the thin film and the measured temperature of the upper plate.

Abstract: An induction heating type cooktop includes: a case, a cover plate coupled to a top of the case and having an upper plate that is configured to support a target object, a thin film disposed on at least one of a top of the upper plate or a bottom of the upper plate, a working coil provided in the case and configured to inductively heat the thin film, a memory storing information on one or more correlations between a temperature of the thin film and a plurality of components of an equivalent circuit associated with the thin film, the plurality of components including an inductor component and a resistor component, and a controller configured to operate the working coil and determine estimated temperature information corresponding to the inductor component and the resistor component of the equivalent circuit.

Abstract: An induction heating type cooktop includes an upper plate coupled to a top side of a case and configured to place an object to be heated on a top of the upper plate, a working coil disposed inside the case to heat the object, a thin film disposed on at least one of a top surface or a bottom surface of the upper plate, an insulator disposed between the bottom surface of the upper plate and the working coil, and a temperature sensor configured to measure a temperature of at least one of the thin film or the upper plate by a plurality of thermocouples.

Abstract: Disclosed herein are a local ventilation equipment and a blower therein. The local ventilation equipment includes: a main body having an intake port in a bottom and an interior area therein; and a blower installed in the interior area of the main body to generate air flow that sucks outside air into the main body through the intake port. The blower comprises an impeller that rotates on a shaft extending laterally and has therein a space to which air sucked through a side is introduced; a scroll housing that accommodates the impeller and has a suction hole formed on a side via which outside air is introduced into the space; and a driving unit that is installed in a space between the main body and the scroll hosing to supply power to rotate the impeller.

Abstract: A microwave heating system includes: a power supply; a first semiconductor module configured to receive power from the power supply and to generate a first microwave; a second semiconductor module configured to receive power from the power supply and to generate a second microwave; a heating chamber that is configured to accommodate an object at an inside of the heating chamber and that allows transmission of the first microwave and the second microwave to the inside of the heating chamber; and a control unit. The control unit is configured to control operation of each of the first semiconductor module and the second semiconductor module, and to control at least one of a frequency, a phase, or a magnitude of each of the first microwave and the second microwave to increase a heating uniformity of the object.

Abstract: A method for controlling a brushless direct current (BLDC) motor is disclosed. The method includes: receiving a constant current; comparing the constant current to a reference current; based on the comparison revealing that the constant current is smaller than the reference current, providing a first speed command to the rotational speed control unit to increase a speed of the BLDC motor; based on the comparison revealing that the constant current is larger than the reference current, providing a second speed command to the rotational speed control unit to decrease a speed of the BLDC motor; based on the comparison revealing that the constant current is the same as the reference current, providing a third speed command to the rotational speed control unit to maintain a speed of the BLDC motor; and controlling, by the rotational speed control unit, a speed of the BLDC motor.

Abstract: Disclosed herein are a local ventilation equipment and a blower therein. The local ventilation equipment includes: a main body having an intake port in a bottom and an interior area therein; and a blower installed in the interior area of the main body to generate air flow that sucks outside air into the main body through the intake port. The blower comprises an impeller that rotates on a shaft extending laterally and has therein a space to which air sucked through a side is introduced; a scroll housing that accommodates the impeller and has a suction hole formed on a side via which outside air is introduced into the space; and a driving unit that is installed in a space between the main body and the scroll hosing to supply power to rotate the impeller.

Abstract: A method for controlling a brushless direct current (BLDC) motor is disclosed. The method includes: receiving a constant current; comparing the constant current to a reference current; based on the comparison revealing that the constant current is smaller than the reference current, providing a first speed command to the rotational speed control unit to increase a speed of the BLDC motor; based on the comparison revealing that the constant current is larger than the reference current, providing a second speed command to the rotational speed control unit to decrease a speed of the BLDC motor; based on the comparison revealing that the constant current is the same as the reference current, providing a third speed command to the rotational speed control unit to maintain a speed of the BLDC motor; and controlling, by the rotational speed control unit, a speed of the BLDC motor.