Abstract:
A control device and an LED light emitting device using the same are provided and technology of providing a high contrast ratio to the LED light emitting device and allowing the LED light emitting device to perform a stable operation is disclosed. The LED light emitting device includes a DC/DC converter reference voltage generator that generates a DC/DC converter reference voltage so that a minimum level of a channel voltage having a largest LED voltage drop agrees with a predetermined minimum reference voltage by detecting a plurality of channel voltages corresponding to LED voltage drops of each of a plurality of LED channels LED and an output voltage controller that controls an output voltage of the DC/DC converter using a distribution voltage corresponding to an output voltage and the DC/DC converter reference voltage.
Abstract:
An image sensor comprises a plurality of pixel units connected to a column line, a signal process circuit configured to process a signal output from the column line according to a switching operation, and a kick-back noise blocking circuit configured to reduce kick-back noise caused by the switching operation. Each of the pixel units includes a photoelectric conversion element. The kick-back noise blocking circuit is connected between the column line and the signal process circuit.
Abstract:
A reformer for a fuel cell system includes a reforming portion for converting fuel containing hydrogen into hydrogen-rich gas; and an adiabatic portion entirely covering the reforming portion, the adiabatic portion being composed of first and second adiabatic layers arranged opposing each other with at least one spacer interposed between the first and second adiabatic layers. As such, the fuel cell system has an effect of enhancing the adiabatic performance of a thermal reaction for producing reforming gas and distributing thermal residence stress uniformly on the surface of the reformer.
Abstract:
Provided is an upstream source light generator of a passive optical network (PON) system. The upstream source light generator includes an amplification part configured to amplify injection light, and a reflection part configured to receive the amplified injection light and generate reflection light by reflecting the amplified injection light with different optical delays according to wavelengths of the amplified injection light.
Abstract:
The present invention relates to an inverter and a lamp driver having the same. The inverter includes a first switch having a first body diode, a second switch having a second body diode, a transformer including a first side coil in which a first current and a first voltage are generated according to switching operations of the first switch and the second switch and a second side coil having a predetermined winding ratio with respect to the first side coil, and a controller for controlling each switching operation of the first switch and the second switch. The controller turns on one of the first switch and the second switch corresponding to one of the first body diode and the second body diode, and a current flows through the first switch and the second switch during a dead time.
Abstract:
Provided is a wavelength selective switch (WSS), and more particularly, a wavelength selective switch for electrically switching a wavelength without physical displacement. The wavelength selective switch includes an optical demultiplexer for dividing an input optical signal into signals having wavelengths corresponding to respective channels, selecting either the optical signal of each channel obtained by dividing the input optical signal or an optical signal input via an add port, and outputting the selected optical signal; and an optical multiplexer including an optical deflecting unit for individually deflecting the optical signals of the respective channels received from the optical demultiplexer according to supplied current or applied voltage, wherein the optical signal of each channel deflected by the optical deflecting unit is output to a specific output port. In the wavelength selective switch, current is supplied to the optical deflectors to switch the channels, resulting in higher reliability, smaller volume and higher switching speed than a conventional wavelength selective switch using mechanical displacement to switch channels.
Abstract:
A The CMOS image sensor includes a pixel array including pixels arranged in a matrix of rows and columns and a row selection unit configured to generate selection signals for simultaneously or concurrently selecting at least two rows from the rows of the pixel array in response to a received row address. An analog-to-digital conversion unit is configured to convert pixel data output from the at least two rows selected from the pixel array into a digital video signal and output the digital video signal. The pixel array outputs the pixel data in response to the selection signals.
Abstract:
A fuel cell system includes a stack having an electricity generator for receiving fuel and air to generate electrical energy, a fuel supply unit for supplying the fuel to the stack, a housing in which the stack is mounted, a fan unit for supplying external air to the interior of the housing for cooling the electricity generator, and a region wherein air heated while cooling the electricity generator and air discharged from the stack and containing moisture are mixed. The air that is mixed in the region is discharged from the region.
Abstract:
A scanner module and an image scanning apparatus employ an illuminator that includes at least one light emitting diode, a light guide to change the direction of the light from the light emitting diode, and a light source holder to which the light emitting diode is mounted, the light source holder being positioned in relation to the light guide such that the light source holder covers an incidence face of the light guide, on which the light from the light source is incident, the surface of light source holder facing the incidence face reflecting light incident thereupon. The reflection of light by the light source holder reduces the possibility of leakage of light, and can enhance luminous intensity of light of the illuminator.
Abstract:
A laser scanning unit and a light source unit employed in the same are provided. The laser scanning unit forms a linear latent image by scanning a light beam onto a photoreceptor. The laser scanning unit includes a light source generating and radiating a light beam. An aperture substrate faces the light source and has a curved reflection surface that includes an opening and faces the light source and reflects a light beam incident on the reflection surface around the opening away from the incident axis. A beam deflector is disposed on the optical path between the aperture substrate and the photoreceptor to deflect the portion of the light beam that has passed through the aperture substrate and scans the light in a scanning direction of the photoreceptor.