Abstract: A display device includes a display portion including a first surface, from which light is emitted in a first direction, and a second surface opposite to the first surface, a first optical portion disposed on the first surface, and a second optical portion disposed on the first surface to be spaced apart from the first optical portion in a second direction crossing the first direction. Each of the first and second optical portions includes a multi-channel lens through which the light from the first surface passes, a first infrared light source, a first camera, and a first lens frame coupled to the multi-channel lens in the first direction to support at least a portion of the multi-channel lens. The first lens frame may include a first recess structure in which the first infrared light source is disposed and a second recess structure in which the first camera is disposed.

Abstract: Discussed is a bolting device that effectively protects an internal configuration of a battery pack and increases manufacturing efficiency during a bolting operation. The bolting device for manufacturing a battery pack includes an electric screwdriver provided with a rotation motor; a driver bit connected to the rotation motor to enable a rotation movement and configured to rotate a bolt; a bit guide member provided with a hollow tube such that the driver bit is inserted into an inside of the hollow tube to be movable; and a guide jig provided with a main body configured to be mounted on an upper portion of a pack housing, the main body having a plate shape and having at least one through hole, and a fixing member inserted into the through hole and mounted therein, and having an insertion hole.

Abstract: The present invention relates to an apparatus for controlling the operation of an LED and to a method for controlling the drive current thereof. More particularly, the present invention relates to an apparatus for controlling the operation of an LED, which is capable of driving a direct current-operated LED module or an alternating current-operated LED module using alternating current power, and to a method for controlling the drive current of the apparatus. According to the present invention, the drive current of an LED array can be output in the form of a sine wave by a constant-current regulation or constant-power regulation even when input voltage varies, thus suppressing harmonics, improving the power factor, minimizing flicker, and preventing a temperature increase in the LED array and in an LED operation control circuit.

Abstract: The present invention relates to an apparatus for controlling the operation of an LED and to a method for controlling the drive current thereof. More particularly, the present invention relates to an apparatus for controlling the operation of an LED, which is capable of driving a direct current-operated LED module or an alternating current-operated LED module using alternating current power, and to a method for controlling the drive current of the apparatus. According to the present invention, the drive current of an LED array can be output in the form of a sine wave by a constant-current regulation or constant-power regulation even when input voltage varies, thus suppressing harmonics, improving the power factor, minimizing flicker, and preventing a temperature increase in the LED array and in an LED operation control circuit.

Abstract: The present invention is a device using a non-linear capacitor and voltage amplification effect, which can generate a pulse having a short pulse width at high voltage. The device comprises a rectification circuit for rectifying the AC input power supply, a semiconductor switch connected to one output terminal of said rectification circuit, a primary coil connected between an output of said semiconductor switch and the other output terminal of said rectification circuit, a diode in which the cathode thereof is connected to the output of said semiconductor switch, a capacitor connected between an anode of said diode and the other output terminal of said rectification circuit, a secondary coil in which one terminal thereof is connected to the anode of said diode, a non-linear capacitor connected between the other terminal of said secondary coil and the other output terminal of said rectification circuit, and a load connected in parallel across two terminals of said non-linear capacitor.

Abstract: The present invention relates to a passive auxiliary circuit for driving power switches connected in series for much higher rating of a power system. The passive auxiliary circuit for an IGBT power switch connected in series with another, comprises two capacitors, which are connected in series across the IGBT; two resistors dividing a voltage applied across the IGBT, each resistor being connected in parallel with each capacitor; and a diode and a third resistor which are connected in series between a gate terminal of the IGBT and a node connecting the two capacitors, wherein the diode is placed such that its cathode is directed to the gate. This passive auxiliary circuit, whose structure is so simple, is able to distribute a supplied high voltage equally over series-connected IGBTs, to reduce additional power loss remarkably, and to relieve transient overvoltage like as a conventional active gate circuit.

Abstract: The present invention is a circuit for zero voltage-zero current switching in a full-bridge DC-DC converter including a transformer for inducing the current and the voltage onto the secondary side by the switching operation of switches configured as full bridge; a full-bridge rectifier by which current of the secondary side flows in only one direction; a smoothing inductor and a capacitor as an output filter, the present circuit comprised of a capacitor and a discharge diode connected in series between the output of the full-bridge rectifier and a ground; a secondary winding of the smoothing inductor and a charge diode connected in series across the capacitor; and another capacitor connected in series with the charge diode.