Abstract: A coil assembly for an induction heating device comprises: a first coil part which has, on one surface thereof, a first cooling-pipe insertion groove indented to the inside thereof; a first cooling pipe coupled to the first cooling-pipe insertion groove so that a part of the outer surface can be exposed; a second coil part which is disposed to be opposite to one surface of the first coil part provided with the first cooling-pipe insertion groove and has, on one surface opposite to the one surface of the first coil part, a second cooling-pipe insertion groove indented to the inside thereof; and a second cooling pipe coupled to the second cooling-pipe insertion groove so that a part of the outer surface can be exposed.

Abstract: A fault-tolerant switching amplifier includes an inverter unit including N inverters, where N is a natural number, each of the N inverters including a plurality of switching elements and configured to perform switching ON or OFF of the switching elements based on a PWM signal inputted to the switching elements, thus switching an applied direct-current (DC) voltage, and to generate an output signal based on the switching and a switch unit including N switches respectively connected to output terminals of the N inverters, each of the N switches being configured to be short-circuited or open-circuited based on whether or not the corresponding one of the N inverters is in a normal operation condition. The output terminals of the N inverters are connected in series, such that output signals outputted from the inverters are combined to generate an amplified signal.

Abstract: The present disclosure provides a high-power variable inductor and a filter employing the same. A provided variable inductor comprises a first inductor and a second inductor. The first inductor is connected to a first input terminal and to a first output terminal of a two-port circuit. The second inductor is connected to a second input terminal and to a second output terminal of the two-port circuit. The first inductor and the second inductor are symmetrical to each other and jointly surround an adjustable area for varying an inductance of the variable inductor.

Abstract: The present disclosure provides a high-power variable inductor and a filter employing the same. A provided variable inductor comprises a first inductor and a second inductor. The first inductor is connected to a first input terminal and to a first output terminal of a two-port circuit. The second inductor is connected to a second input terminal and to a second output terminal of the two-port circuit. The first inductor and the second inductor are symmetrical to each other and jointly surround an adjustable area for varying an inductance of the variable inductor.

Abstract: Disclosed is a transformer having a multilayered winding structure. The transformer is supplied with alternating current power, and transfers the power to another circuit by electromagnetic induction. The transformer includes a core section having a hollow section, and primary and secondary windings isolated electrically from each other and wound around the core section. Each of the primary and secondary windings has a multilayered structure in which a plurality of metal plates are laminated with gaps therebetween and are coupled to each other at one side ends thereof, and the metal plates of the primary and secondary windings are inserted into and coupled to each other at the other side ends thereof in such a manner that the metal plates of the primary winding are alternately inserted into the gaps of the second windings.

Abstract: Disclosed is a transformer having a multilayered winding structure. The transformer is supplied with alternating current power, and transfers the power to another circuit by electromagnetic induction. The transformer includes a core section having a hollow section, and primary and secondary windings isolated electrically from each other and wound around the core section. Each of the primary and secondary windings has a multilayered structure in which a plurality of metal plates are laminated with gaps therebetween and are coupled to each other at one side ends thereof, and the metal plates of the primary and secondary windings are inserted into and coupled to each other at the other side ends thereof in such a manner that the metal plates of the primary winding are alternately inserted into the gaps of the second windings.

Abstract: Disclosed is a synchronous rectifier type SRC for operating in an intermittence mode, which includes: an input power for supplying the input DC voltage; an input-side switching unit for switching four input-side switching devices to convert the input DC voltage to AC voltage, the input-side switching unit being connected to the input power, an LC resonance circuit for storing energy in a resonance inductor and a resonance capacitor by means of LC resonance, and outputting resonance voltage, the LC resonance circuit being connected to the input-side switching unit; a transformer with a primary winding and a secondary winding for converting the resonance voltage to voltage of a predetermined level according to a turn ratio to generate secondary voltage, and transferring the secondary voltage through the secondary winding, the primary winding being connected to the LC resonance circuit; an output-side switching unit for switching four output-side switching devices to convert the secondary voltage to the output D