Abstract: Embodiment relates to a switch control circuit, a switch control method, and a power supply using the switch control circuit. The power supply supplies power to a load using an input voltage. The switch control circuit controls a switching operation of the power switch that controls the power supply. The switch control circuit detects a duty of the power switch using a signal for controlling the switching operation of the power switch, detects the load using the feedback voltage, and determines a short-circuit of the sense resistor according to the detected duty and the detected load.

Abstract: A protection mode control circuit includes an auto-restart counter configured to count the cycle of a first signal in a protection condition and to generate an auto-restart signal when a result of the count reaches a protection reference value and a latch mode unit configured to generate a latch mode signal for changing protection mode to latch mode when the auto-restart signal is consecutively generated by a predetermined threshold number.

Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.

Abstract: A modulation mode control circuit includes a modulation mode controller configured to select modulation mode based on the result of a comparison between a control voltage and a predetermined PWM threshold voltage and to generate a PWM reference voltage using the PWM threshold voltage and the control voltage and a control signal generation unit configured to generate a first control signal based on the result of a comparison between an oscillation control signal for controlling a switching frequency and the control voltage and the result of a comparison between the oscillation control signal and the PWM threshold voltage and to generate a second control signal based on the result of a comparison between the oscillation control signal and the PWM reference voltage.

Abstract: The present invention relates to a gate driving circuit, a switch control circuit including the gate driving circuit, and a power supply. The gate driving circuit generates a gate voltage of the power switch. The gate driving circuit includes: a delay control circuit generating a first control signal that controls a rising slope of the gate voltage at a first time after a first delay period is passed from a rising time of the gate voltage and generating a second control signal that controls the rising slope of the gate voltage at a time after a second delay period is passed from the first time; and a temperature compensation circuit that varies the first delay period according to a temperature.

Abstract: Disclosed are a wireless power transmitter and a method of transmitting power thereof. The wireless power transmitter to wirelessly transmit power to a wireless power receiver includes a transmission coil to receive power from a power supply apparatus, and a transmission resonance unit to transmit the power received therein from the transmission coil to the wireless power receiver using resonance. The transmission resonance unit includes an inner loop, and an outer loop connected to the inner loop while surrounding the inner loop.

Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.

Abstract: A resonant converter includes a first switch coupled between a first node and a primary side ground, a second switch coupled between an input voltage and the first node, at least one capacitor and at least one inductor coupled in series between both ends of the first switch, and a switch control circuit that shifts switching frequencies of the first and second switches during a period for which an abnormal event lasts when occurrence of the abnormal event is detected, and shifts the switching frequencies in an opposite direction when the abnormal event ends.

Abstract: A resonant converter includes a primary-side winding electrically coupled to an input voltage, a secondary-side winding electrically coupled to a load, first and second switches coupled to one end of the primary-side winding, and a switch control circuit configured to differently control switching frequency limit ratios of the first and second switches by differently limiting a frequency variation ratio of a first clock signal that determines switching frequencies of the first and second switches according to variation of one of the input voltage and the load.

Abstract: The present invention relates to a gate driving circuit, a switch control circuit including the gate driving circuit, and a power supply. The gate driving circuit generates a gate voltage of the power switch. The gate driving circuit includes: a delay control circuit generating a first control signal that controls a rising slope of the gate voltage at a first time after a first delay period is passed from a rising time of the gate voltage and generating a second control signal that controls the rising slope of the gate voltage at a time after a second delay period is passed from the first time; and a temperature compensation circuit that varies the first delay period according to a temperature.

Abstract: Embodiment relates to a switch control circuit, a switch control method, and a power supply using the switch control circuit. The power supply supplies power to a load using an input voltage. The switch control circuit controls a switching operation of the power switch that controls the power supply. The switch control circuit detects a duty of the power switch using a signal for controlling the switching operation of the power switch, detects the load using the feedback voltage, and determines a short-circuit of the sense resistor according to the detected duty and the detected load.

Abstract: Provided is a method of estimating a load carrying capacity of a bridge. The load carrying capacity estimation method includes the steps of: estimating a mode coefficient of the bridge using an acceleration signal obtained from an accelerometer that is installed in the bridge; updating an analysis model of the bridge using the estimated mode coefficient; and estimating a rating factor of the bridge by applying a dead load and a design live load to the updated analysis model.

Abstract: Disclosed herein is a power line channel-adaptive communications system and method. The power line channel-adaptive communications system includes a transmitting end, a channel-adaptive controller, and a receiving end. The transmitting end generates an adaptive chirp symbol signal of a preset type for transmission data according to a channel state of the power line, modulates the generated adaptive chirp symbol signal in any one of first and second transmission modes, and transmits the modulated adaptive chirp symbol signal via the power line channel. The channel-adaptive controller controls the type and transmission mode of the adaptive chirp symbol signal. The receiving end restores the transmission data by demodulating the adaptive chirp symbol signal, received via the power line channel, in any one of the first and second transmission modes according to the channel state of the power line.

Abstract: A method of fabricating a polycrystalline silicon thin that includes a metal layer forming operation of forming a metal layer on an insulating substrate, a first silicon layer forming operation of stacking a silicon layer on the metal layer formed in the metal layer forming operation, a first annealing operation of forming a silicide layer using by moving catalyst metal atoms from the metal layer to the silicon layer using an annealing process, a second silicon layer forming operation of stacking an amorphous silicon layer on the silicide layer, and a crystallization operation of crystallizing the amorphous silicon layer into crystalline silicon through the medium of particles of the silicide layer.

Abstract: Provided is a method of estimating a load carrying capacity of a bridge. The load carrying capacity estimation method includes the steps of: estimating a mode coefficient of the bridge using an acceleration signal obtained from an accelerometer that is installed in the bridge; updating an analysis model of the bridge using the estimated mode coefficient; and estimating a rating factor of the bridge by applying a dead load and a design live load to the updated analysis model.

Abstract: A method of fabricating a polycrystalline silicon thin that includes a metal layer forming operation of forming a metal layer on an insulating substrate, a first silicon layer forming operation of stacking a silicon layer on the metal layer formed in the metal layer forming operation, a first annealing operation of forming a silicide layer using by moving catalyst metal atoms from the metal layer to the silicon layer using an annealing process, a second silicon layer forming operation of stacking an amorphous silicon layer on the silicide layer, and a crystallization operation of crystallizing the amorphous silicon layer into crystalline silicon through the medium of particles of the silicide layer.

Abstract: An impulse radio-based ultra wideband communication system, using an ultra wideband impulse and a 1-bit high-speed digital sampler, includes a transmitting RF module, a receiving RF module, a signal recovery unit, a transmitting signal processor, a receiving signal processor, and an ultra wideband antenna. The transmitting RF module includes an integrated impulse generator capable of implementing on-off-keying modulation and pulse position modulation, and an amplifier for amplifying output of the integrated impulse generator. The receiving RF module includes a two stage envelope detector for detecting a received signal and a comparator for converting the detected signal into a rectangular pulse. The signal recovery unit restores the signal from the receiving RF module to a digital signal using the 1-bit digital sampler. The signal processor includes a receiving signal processor for synchronizing the digital signal and decoding the detected signal.

Abstract: A neutral beam etching device for separating and accelerating a plasma is provided. The device includes a first chamber having a first opening formed at one side thereof; a second chamber having a second opening formed at one side thereof and being disposed inside the first chamber to form a plasma generation area; a first channel fluidly communicating the first opening with the plasma generation area; a second channel fluidly communicating the second opening with the plasma generation area; a coil disposed on an outer surface of the first chamber and which generates a magnetic field to generate a plasma in the plasma generation area; and an acceleration part disposed within the first and second chambers and configured to separate the plasma into a positive ion and an electron, accelerate the positive ion and the electron, and discharge the positive ion and electron through the first and the second channels.

Abstract: A heating structure of an inkjet printhead and an inkjet printhead including the heating structure. The heating structure includes a substrate, a heater formed on the substrate, an electrode formed on the heater, a passivation layer formed to cover the heaters and the electrodes, and carbon nanotubes (CNTs) formed in the passivation layer.

Abstract: Disclosed herein is a power line channel-adaptive communications system and method. The power line channel-adaptive communications system includes a transmitting end, a channel-adaptive controller, and a receiving end. The transmitting end generates an adaptive chirp symbol signal of a preset type for transmission data according to a channel state of the power line, modulates the generated adaptive chirp symbol signal in any one of first and second transmission modes, and transmits the modulated adaptive chirp symbol signal via the power line channel. The channel-adaptive controller controls the type and transmission mode of the adaptive chirp symbol signal. The receiving end restores the transmission data by demodulating the adaptive chirp symbol signal, received via the power line channel, in any one of the first and second transmission modes according to the channel state of the power line.