Abstract: An optical device is disclosed herein. In some embodiments, a optical device includes a liquid crystal element having a top surface, a bottom surface, and sides separating the top surface and the bottom surface, and an outer layer surrounding the sides of the liquid crystal element, wherein the liquid crystal element comprises a first base layer, a second base layer, a liquid crystal layer positioned between the first base layer and the second base layer, a pressure-sensitive adhesive layer positioned between the first base layer and the liquid crystal layer, and a spacer to maintain a gap between the first base layer and the second base layer, wherein the optical device satisfies Equation 1: ?T2×0.4?T1?T2?T2×0.4??[Equation 1] wherein, T1 is a thickness of the outer layer, and T2 is a thickness of the liquid crystal element.

Abstract: The present invention relates to a power converter including a transformer; a current doubler including a switch element and connected to a secondary side of the transformer to double a current of the transformer according to an operation of the switch element; and a voltage resonator connected to the switch elements, wherein the voltage resonator includes a switch element and a capacitor which are connected to each other in series.

Abstract: According to one embodiment of the present invention, when a power supply device including first and second amplification units which share an energy storage element is used, it is possible to reduce voltage stress on a semiconductor device and to consistently maintain voltages output to the first and second amplification units by independently adjusting the amplification rates of the first and second amplification units.

Abstract: According to one embodiment of the present invention, when a power supply device having first and second amplification units which share an energy storage element is used, it is possible to reduce voltage stress of a semiconductor device and to consistently maintain output voltage outputted to the first and second amplification units while individually adjusting the amplification rates of the first and second amplification units.

Abstract: The present invention relates to a power converter including a transformer; a current doubler including a switch element and connected to a secondary side of the transformer to double a current of the transformer according to an operation of the switch element; and a voltage resonator connected to the switch elements, wherein the voltage resonator includes a switch element and a capacitor which are connected to each other in series.

Abstract: Disclosed are a multiple-output DC/DC converter and a power supply having the same. The multiple-output DC/DC converter includes a converter including a transformer and a first surge absorbing module, wherein the transformer includes a first switch provided to a primary side and outputs a first voltage to a secondary side, and the first surge absorbing module is connected to the primary side of the transformer and absorbs a surge voltage formed at the first switch by a leakage inductance of the transformer; and a first energy converting module to receive output energy supplied from the first surge absorbing module and output a second voltage.

Abstract: A current regulation apparatus is provided. The current regulation apparatus includes a trans unit, a first switching unit, a voltage detection unit, a voltage comparison unit, and a control unit. The trans unit includes an auxiliary winding unit. The first switching unit controls an operation of the trans unit. The voltage detection unit detects a voltage induced to the auxiliary winding unit. The voltage comparison unit compares a voltage detected by the voltage detection unit and a reference voltage. The control unit adjusts a turn-on section of the first switching unit according to an output voltage of the voltage comparison unit.

Abstract: According to one embodiment of the present invention, when a power supply device having first and second amplification units which share an energy storage element is used, it is possible to reduce voltage stress of a semiconductor device and to consistently maintain output voltage outputted to the first and second amplification units while individually adjusting the amplification rates of the first and second amplification units.

Abstract: According to one embodiment of the present invention, when a power supply device including first and second amplification units which share an energy storage element is used, it is possible to reduce voltage stress on a semiconductor device and to consistently maintain voltages output to the first and second amplification units by independently adjusting the amplification rates of the first and second amplification units.

Abstract: A current regulation apparatus is provided. The current regulation apparatus includes a trans unit, a first switching unit, a voltage detection unit, a voltage comparison unit, and a control unit. The trans unit includes an auxiliary winding unit. The first switching unit controls an operation of the trans unit. The voltage detection unit detects a voltage induced to the auxiliary winding unit. The voltage comparison unit compares a voltage detected by the voltage detection unit and a reference voltage. The control unit adjusts a turn-on section of the first switching unit according to an output voltage of the voltage comparison unit.

Abstract: A current regulation apparatus is provided. The current regulation apparatus includes a trans unit, a first switching unit, a voltage detection unit, a voltage comparison unit, and a control unit. The trans unit includes an auxiliary winding unit. The first switching unit controls an operation of the trans unit. The voltage detection unit detects a voltage induced to the auxiliary winding unit. The voltage comparison unit compares a voltage detected by the voltage detection and a reference voltage. The control unit adjusts a turn-on section of the first switching unit according to an output voltage of the voltage comparison unit.

Abstract: Disclosed are a multiple-output DC/DC converter and a power supply having the same. The multiple-output DC/DC converter includes a converter including a transformer and a first surge absorbing module, wherein the transformer includes a first switch provided to a primary side and outputs a first voltage to a secondary side, and the first surge absorbing module is connected to the primary side of the transformer and absorbs a surge voltage formed at the first switch by a leakage inductance of the transformer; and a first energy converting module to receive output energy supplied from the first surge absorbing module and output a second voltage.

Abstract: An input voltage transfer apparatus for an LED lighting system is provided. The input voltage transfer apparatus includes a source voltage storage unit, a zero voltage switching unit, and a nonzero voltage switching unit. The source voltage storage unit stores a source voltage. The zero voltage switching unit turns on according to the source voltage stored in the source voltage storage unit when a zero voltage is inputted. The nonzero voltage switching unit turns on according to a current applied thereto through the zero voltage switching unit when a nonzero voltage is inputted. When the nonzero voltage switching unit is turned on, the source voltage storage unit discharges the stored source voltage.

Abstract: An LED lighting system is provided. The LED lighting system includes a main transformer, a voltage detector, a current controller, a second reference voltage supplier, and a power factor compensation circuit. The main transformer transforms an input signal to supply the transformed input signal to an LED group. The voltage detector supplies a control voltage proportional to a level of an input voltage corresponding to the input signal. The current controller includes a first voltage storage, a negative voltage applier, a second voltage storage, switch, and a current control signal generator. The first voltage storage stores the control voltage supplied from the voltage detector or discharges a stored voltage. The negative voltage applier is connected to the first voltage storage, and connected to a ground to apply the control voltage to the ground when the control voltage is a negative voltage.

Abstract: An LED lighting system is provided. The LED lighting system includes a main transformer, a voltage detector, a current controller, a second reference voltage supplier, and a power factor compensation circuit. The main transformer transforms an input signal to supply the transformed input signal to an LED group. The voltage detector supplies a control voltage proportional to a level of an input voltage corresponding to the input signal. The current controller includes a first voltage storage, a negative voltage applier, a second voltage storage, switch, and a current control signal generator. The first voltage storage stores the control voltage supplied from the voltage detector or discharges a stored voltage. The negative voltage applier is connected to the first voltage storage, and connected to a ground to apply the control voltage to the ground when the control voltage is a negative voltage.

Abstract: An input voltage transfer apparatus for an LED lighting system is provided. The input voltage transfer apparatus includes a source voltage storage unit, a zero voltage switching unit, and a nonzero voltage switching unit. The source voltage storage unit stores a source voltage. The zero voltage switching unit turns on according to the source voltage stored in the source voltage storage unit when a zero voltage is inputted. The nonzero voltage switching unit turns on according to a current applied thereto through the zero voltage switching unit when a nonzero voltage is inputted. When the nonzero voltage switching unit is turned on, the source voltage storage unit discharges the stored source voltage.

Abstract: A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding, a secondary winding receiving a power induced from the primary winding, and a tertiary winding receiving the power induced from the primary winding. The first output unit is connected to the secondary winding of the transformer, and outputs a first power current to an LED in a first operating condition. The second output unit is connected to the tertiary winding of the transformer, and outputs a second power current to the LED in a second operating condition. When the LED is connected to the power supply apparatus for LED, the power supply apparatus allows a current equal to or less than a predetermined current to flow in the LED, thereby protecting the LED from an overcurrent.

Abstract: A current regulation apparatus is provided. The current regulation apparatus includes a trans unit, a first switching unit, a voltage detection unit, a voltage comparison unit, and a control unit. The trans unit includes an auxiliary winding unit. The first switching unit controls an operation of the trans unit. The voltage detection unit detects a voltage induced to the auxiliary winding unit. The voltage comparison unit compares a voltage detected by the voltage detection and a reference voltage. The control unit adjusts a turn-on section of the first switching unit according to an output voltage of the voltage comparison unit.

Abstract: A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding, a secondary winding receiving a power induced from the primary winding, and a tertiary winding receiving the power induced from the primary winding. The first output unit is connected to the secondary winding of the transformer, and outputs a first power current to an LED in a first operating condition. The second output unit is connected to the tertiary winding of the transformer, and outputs a second power current to the LED in a second operating condition. When the LED is connected to the power supply apparatus for LED, the power supply apparatus allows a current equal to or less than a predetermined current to flow in the LED, thereby protecting the LED from an overcurrent.

Abstract: An embodiment provides an inverter transformer comprising: a first bobbin around which a first coil is wound, the first bobbin comprising a first through hole; a second bobbin around which a second coil is wound, the second bobbin comprising a second through hole; a spacer between the first and the second bobbins; and a core inserted into the first and the second through holes.