Bo-Hwan
Bo-Hwan Choi, Anyang-Si KR
Patent application number | Description | Published |
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20150223298 | PARALLEL-TYPE LED LIGHTING DEVICE - The present disclosure provides an AC-direct-type LED-lighting device including compensation circuit for AC input compensation, including a compensation inductor and first compensation capacitor parallelly connected to one terminal of AC input and a second compensation capacitor connected in series; rectifying unit for rectifying output from second compensation capacitor terminals to obtain direct current; and LED array driven by the rectifying unit output, wherein capacities of the first and second compensation capacitors and the compensation inductor and LED array output voltage are determined to cause 0.9 or larger cosine value of a phase, with respect to the AC input voltage, of resulting current obtained by dividing AC input voltage by sum of (i) parallel value of an equivalent impedance R | 08-06-2015 |
Bo-Hwan Park, Seoul, KR
Patent application number | Description | Published |
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20110011448 | THIN FILM SOLAR CELL AND METHOD OF MANUFACTURING THE SAME - A thin film solar cell includes a plurality of a unit solar cell each including an active area and a non-active area. Each unit solar cell further includes a first electrode, a first active layer disposed on the first electrode, an interlayer disposed on the first active layer, a second active layer disposed on the interlayer, and a second electrode disposed on the second active layer. The active area includes a first portion where the interlayer is disposed, and a second portion where the interlayer is not disposed. | 01-20-2011 |
Bo-Hwan Park, Yongin-Si KR
Patent application number | Description | Published |
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20130270111 | SPUTTERING DEVICE - A sputtering device, including a chamber providing a reaction space, a sputter unit including a target disposed in the chamber, and a conveying unit including a plurality of rollers for supporting a substrate and for conveying the substrate relative to the target along a first direction, the conveying unit including fixed roller units having a predetermined diameter, and a variable roller unit having a diameter that changes in a second direction at both ends thereof, the second direction being orthogonal to the first direction. | 10-17-2013 |
20140353150 | SPUTTERING APPARATUS - A sputtering apparatus for depositing a deposition material on a substrate, the sputtering apparatus including a chamber; a target in the chamber, the target including the deposition material; and a shield between the substrate and an inner wall of the chamber, the shield including a plurality of sub-shields. | 12-04-2014 |