Title:
2-AXIS SUNLIGHT TRACKING SYSTEM USING PHOTO CONDUCTIVE CELL
Document Type and Number:
WIPO Patent Application WO/2010/120123
Kind Code:
A3
Abstract:
The present invention relates to a 2-axis tracking system for tracking sunlight using a photo conductive cell and a linear actuator. The movement of the sun is 3D spatial coordinate translation through changes in altitude and azimuth, wherein a sunlight sensing device is attached to a solar energy collecting panel for tracking the movement of the sun and the sunlight focused by a convex lens on the top of the device becomes perpendicular to the surface. A circuit, which is turned on in bright times and turned off in dark times, is made of photo conductive cells, of which internal resistance value varies according to the brightness of light, and transmits signals to a motor control circuit made of forward and reverse circuits so as to drive an actuator. If one point moves rectilinearly with respect to two points as an axis among three hinged points, the motion of the point is converted into rotational motion. Furthermore, the other one point moves with respect to another one point and a fixed point, both serving as an axis, so as to carry out the same motion. Accordingly, sunlight may be tracked in combination of the motions. As for azimuth corresponding to the operation start time according to season, a supporting column is formed with a horizontal groove to make a track and one stroke is carried out for one year using an azimuth control motor and a worm reduction gear, and as for corresponding altitude, the operation start time is controlled by a programmed control circuit, so as to enable normal operation. Desired time for turning on a LED lamp using solar cells, the LED lamp and a sunlight sensing circuit is controlled by the programmed control circuit so that the sun may be tracked even on a mixed day when the sun is hidden by clouds. Therefore, the photo conductive cell in contact with the LED lamp receives light, and the sunlight sensing circuit sends a signal to the motor control circuit so as to drive the actuator, thereby catching up with the movement of the sun after a break due to cloudy weather.
Inventors:
LEE CHAN HO (KR)
Application Number:
PCT/KR2010/002320
Publication Date:
March 31, 2011
Filing Date:
April 14, 2010
Export Citation:
Assignee:
LEE CHAN HO (KR)
International Classes:
F24S50/20; H01L31/042
Foreign References:
| US20080066735A1 | 2008-03-20 | |||
| JPS5376058A | 1978-07-06 | |||
| KR100427690B1 | 2004-04-28 |
Attorney, Agent or Firm:
TAEDONG INTERNATIONAL PATENT LAW FIRM (319 Gasan-dong,Geumcheon-gu, Seoul 153-023, KR)
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