Abstract: The on-state characteristics of a transistor are improved and thus, a semiconductor device capable of high-speed response and high-speed operation is provided. A highly reliable semiconductor device showing stable electric characteristics is made. The semiconductor device includes a transistor including a first oxide layer; an oxide semiconductor layer over the first oxide layer; a source electrode layer and a drain electrode layer in contact with the oxide semiconductor layer; a second oxide layer over the oxide semiconductor layer; a gate insulating layer over the second oxide layer; and a gate electrode layer over the gate insulating layer. An end portion of the second oxide layer and an end portion of the gate insulating layer overlap with the source electrode layer and the drain electrode layer.

Abstract: An induction heating apparatus is provided. The induction heating apparatus includes a heating coil configured to heat an object to be heated, a full-bridge type inverter configured to supply power to the heating coil, a capacitor provided between an intermediate node of one arm of the inverter and one end of the heating coil, and a first relay provided between the intermediate node and the other end of the heating coil 30. An intermediate node of the other arm of the inverter and an intermediate point of the heating coil are connected through a first wire. The induction heating apparatus includes a processor configured to open or close the first relay based on an impedance of the object to be heated.

Abstract: A heating device for tracking a resonance frequency includes a heating coil for heating a cooking appliance, a parallel resonance circuit including an inductor including the heating coil and a resonance capacitor resonating with the inductor, an inverter unit for supplying power to the parallel resonance circuit, a first current sensor for detecting an output current supplied from the inverter unit to the parallel resonance circuit, and a processor for controlling a driving frequency of the inverter unit so that a peak value of the output current detected by the first current sensor is smaller than a predetermined first threshold value.

Abstract: An induction heating cooker for achieving high output of power and small thickness is provided. The induction heating cooker includes a main body provided at an upper side with a top plate, a heating coil to induction-heat a heating object loaded on the top plat, and a blower device configured to draw external air into the main body and blow the air into the heating coil. The heating coil and the blower device are accommodated in the main body. The main body is provided therein with a first flow path allowing air blown by the blowing device to be supplied toward the heating coil from an outer periphery side and a second flow path allowing air blown by the blowing device to be supplied toward the heating coil from a lower side.

Abstract: An induction heating apparatus is provided. The induction heating apparatus includes a heating coil, an inverter, a current sensor configured to measure a driving current supplied from the inverter to the heating coil, and a controller configured to provide a drive signal to the inverter to allow the driving current to follow a target current based on a user input. The controller reduces a driving duty of the drive signal based on the driving current exceeding a predetermined reference current, and the controller provides a drive signal to the inverter to allow the driving current to follow a current less than the target current, based on the driving current being less than or equal to the predetermined reference current after reducing the driving duty of the drive signal.

Abstract: An induction heating apparatus including an inverter comprising a switching element, the inverter configured to supply a power to a first node based on an operation of the switching element; a first heating coil around which a wire is wound in a first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; a second heating coil around which a wire is wound in a second winding direction different from the first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; and at least one processor configured to control a resonance frequency of a current flowing through the first heating coil and the second heating coil.

Abstract: An induction heating apparatus is provided. The induction heating apparatus includes a heating coil configured to heat an object to be heated, a full-bridge type inverter configured to supply power to the heating coil, a capacitor provided between an intermediate node of one arm of the inverter and one end of the heating coil, and a first relay provided between the intermediate node and the other end of the heating coil 30. An intermediate node of the other arm of the inverter and an intermediate point of the heating coil are connected through a first wire. The induction heating apparatus includes a processor configured to open or close the first relay based on an impedance of the object to be heated.

Abstract: An induction heating device using a resonance circuit method and a control method thereof that are capable of preventing occurrence of overcurrent even when an object is moved are provided. The induction heating device for heating an object includes a resonance circuit including a heating coil and a condenser, an inverter configured to supply power to the resonance circuit, a detector configure to detect a value related to a movement of the object, and at least one processor configured to identify whether the object is moved based on the value detected by the detector, and upon determining that the object is moved, lower a driving frequency of the inverter and an output of the inverter.

Abstract: An induction heating apparatus is provided. The induction heating apparatus includes a heating coil, an inverter, a current sensor configured to measure a driving current supplied from the inverter to the heating coil, and a controller configured to provide a drive signal to the inverter to allow the driving current to follow a target current based on a user input. The controller reduces a driving duty of the drive signal based on the driving current exceeding a predetermined reference current, and the controller provides a drive signal to the inverter to allow the driving current to follow a current less than the target current, based on the driving current being less than or equal to the predetermined reference current after reducing the driving duty of the drive signal.

Abstract: An induction heating cooker for achieving high output of power and small thickness is provided. The induction heating cooker includes a main body provided at an upper side with a top plate, a heating coil to induction-heat a heating object loaded on the top plat, and a blower device configured to draw external air into the main body and blow the air into the heating coil. The heating coil and the blower device are accommodated in the main body. The main body is provided therein with a first flow path allowing air blown by the blowing device to be supplied toward the heating coil from an outer periphery side and a second flow path allowing air blown by the blowing device to be supplied toward the heating coil from a lower side.

Abstract: An induction heating apparatus including an inverter comprising a switching element, the inverter configured to supply a power to a first node based on an operation of the switching element; a first heating coil around which a wire is wound in a first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; a second heating coil around which a wire is wound in a second winding direction different from the first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; and at least one processor configured to control a resonance frequency of a current flowing through the first heating coil and the second heating coil.