WO2010120123A2

WO2010120123A2 - 2-axis sunlight tracking system using photo conductive cell

Info

Publication number: WO2010120123A2
Application number: PCT/KR2010/002320
Authority: WO
Inventors: 이찬호
Original assignee: Lee Chan Ho
Priority date: 2009-04-14
Filing date: 2010-04-14
Publication date: 2010-10-21
Also published as: KR20100010394U; WO2010120123A3

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.

Description

Photovoltaic 2-axis Tracking Device Using Photoconductive Cell

The present invention tracks sunlight by moving the linear actuator with two limit switches forward and backward with the solar sensing device and the solar sensing circuit to track the sunlight so that the sun and the solar energy collection panel are always vertical. It relates to a device to.

In order to use solar energy, the efficiency is the highest when the solar collector panel is perpendicular to the sun. The two-axis tracking type is more efficient than the fixed or single axis type. Conventionally, for this purpose, the altitude and azimuth of the sun are sensed, and the signal is processed by a separate device to control the motor or to control the motor by a pre-programmed method. However, the present invention uses the principle that the two points are converted into rotational motion when the actuator detects light with the solar sensing device and the solar sensing circuit and immediately sends a signal to the motor control circuit so that the actuator makes a linear motion of forward and backward. Since the actuator's bracket exerts force at a certain distance from the hinge while supporting the weight of the solar collector panel, this force can move the panel with a small force like a lever, and each point consists of a hinge In other words, the compression force is a truss structure that interacts with each other. The rotation moment force due to the actuator and the wind pressure is also transmitted to the pipe 6 connected to the hinge 7 as shown in FIG. 6 so as not to rotate in the worm reducer with one round bar.

The present invention is to operate the motor control directly to the detected signal without measuring the altitude and azimuth angle of the sun or processing the signal through a separate device in order to minimize the energy required for the device to track sunlight The purpose is to increase the installation cost and operating efficiency by miniaturizing the device by simplifying the design.

The present invention converts the linear motion of the actuator into a rotary motion on a mechanical principle. To this end, the rods of two actuators installed at right angles on the axis of the fixed hinge 7 and the connecting portions of the hinges 8 and 9 can be rotated. In order to drive this, the photoconductive cell arrangement of the solar sensing device is arranged so that the (X, Z) axis of FIG. 5 is parallel to the (X, Z) axis of FIG. 7 and one is forward and the other is backward. Face each other. Then, the light sensed by the photoconductive cell from the solar sensing device is signaled to the motor control circuit of the blackout and the reverse circuit to the Taewang light sensing circuit to perform the corresponding operation.

Seasonal difference between the altitude and azimuth of the sun is so large that the angle of incidence to the first solar sensing device 10 at sunrise does not drive out of range. To solve this problem, the azimuth angle corresponding to the start time of the seasonal operation on the support column (4) makes a track by making a horizontal groove connecting the lower limbs in the winter sol, and moves the azimuth control motor and the worm reducer one stroke for one year. 6) and the external pipe (3) rotates to adjust the azimuth angle and the corresponding altitude may be operated by controlling the operation start time with a programmed control circuit.

The present invention is a structure that can operate immediately if there is sunlight, stops in the weather that can not collect solar energy, do not unnecessary operation, and can operate without applying a lot of power, the energy required to enter the device is small and the value or signal It is possible to operate even if there is no separate device for processing, thereby reducing the installation cost.

1 is a front view of a solar tracking device.

Figure 2 is a side view of the solar tracking device of an example of starting operation.

3 is a perspective view of a solar sensing device.

Figure 4 is a focal circle of the photosensitive device, cross-sectional view of the solar sensing port.

Figure 5 is a photoconductive cell, LED bulb arrangement cross-sectional view of the solar sensing device.

Figure 6 is an assembly and partial cross-sectional view of the hinge for the support pillar.

Figure 7 is a hinge cross section for the support column.

8 is a perspective view of the solar height azimuth adjustment device assembly.

9 is a flow chart of the solar tracking device of the present invention.

As shown in FIG. 1, the configuration of the present invention includes an actuator, a solar sensing device 10, a controller 30, an azimuth adjusting device 40, and the like. The structure of the solar sensing device, as shown in Figure 3, to prevent the sunlight is reflected inside the upper cylinder. Where the focus is formed by the convex lens 17, there is a focal circle 15 of a circle, the lower portion of the focal circle is a cylindrical photoconductive cell case 16 of different diameters surrounding the photoconductive cell 25 have.

The structure of the solar sensing device includes

solar sensing ports

11, 12, 13, and 14, which are drilled upwards to trap light out of the focus source around the focus source, and each port reflects light well. Each partition has a structure of a thin film. Under each solar sensing port, there is a photoconductive cell (21, 22, 23, 24) that installs a filter for adjusting the brightness of the light where it is connected to the photoconductive cell case and detects light thereunder.

LED bulbs

26, 27, 28, and 29 are attached to the photoconductive cell case that blocks light.

The principle of operation is that when the sun moves while the focus is focused, the focus moves in the opposite direction. When the light is emitted from the solar sensing port out of the focusing circle, the light is trapped inside the interior of the sensor. Illumination will increase. The light spreads evenly anywhere in the port, through the filter at the bottom of the port, and the photoconductive cell below it receives light, which lowers the cell's internal resistance and causes current to flow. Then, the solar sensing circuit connected to it sends a signal to the motor control circuit to drive the actuator.

When the actuator is operated, the focus is raised back to the focus source 15 in the solar sensing device attached to the solar energy collecting panel. Immediately afterwards, a stop signal is sent, in which a pair of capacitors are installed in the motor control circuit to delay the motor to raise the focus to the center of the focus circle.

When the timer is operated as shown in FIGS. 2 and 9 before starting operation at sunrise, the

solar cells

51 and 52 turn on the

LEDs

27 and 28 with a power charged in a rechargeable battery for a predetermined time. 22, 23 receives the light and sends a signal from the

solar sensing circuits

32, 33 to the

motor control circuits

36, 37. As a result, the actuator 1 retreats to the bottom dead center, and the actuator 2 is superior. Advance to the point and wait. The operation starts by operating the circuit at a time when the altitude of the sun is perpendicular to the panel on which the altitude of the programmed control circuit is waiting. When the focal point enters the solar sensing port, the photoconductive cell 25 lights In response, the solar sensing circuit 35 operates to turn off the

LEDs

27 and 28 and start normal operation. When the normal operation is started, the light of the focal point out of the focus source in accordance with the movement of the sun enters the solar sensing port 11 and is irradiated to the photoconductive cell 21, and the motor control circuit ( A signal is sent to 36 to cause the actuator 1 to move forward. After such a period of time, the focus light again enters the solar sensing port 14 and is irradiated to the photoconductive cell 24 to transmit a signal from the solar sensing circuit 34 to the motor control circuit 37. The actuator 2 is sent backward. Afterwards, the actuators 1 and 2 repeat the above operation, and according to which sensing port is focused according to the movement of the sun, the corresponding movement is eventually tracked.

When the operation is stopped and cleared again in normal operation, if the focus is in the solar sensing port, it operates normally. If the cloudy weather persists for a certain time, the focus cannot be detected beyond the solar sensing port. Is stopped.

To solve this problem, as shown in FIG. 3, there is a case 16 of a cylindrical photoconductive cell under the focal circle and a photoconductive cell 25 therein, with illuminance when the focal point is in the focal circle. In order to lower the temperature below a certain level and prevent light from being directly reflected on the photoconductive cell, a filter 15a having a structure that can withstand high temperatures is installed. In addition, four holes 16a of a predetermined size are formed in the cylindrical photoconductive cell case to detect the light of the solar sensing port, and when the focus is located in the focus source or the solar sensing port, the photoconductive cell 25 emits light. By sensing, the solar sensing circuit 35 causes the LED light bulb to always turn off the power charged by the

solar cells

51 and 52. On the contrary, when the light of the focus is out of the focus source and the solar sensing port, the weather is clouded by configuring the solar sensing circuit 35 to turn on the charged power. When the driving is off, the photoconductor cell 25 does not receive light to apply the charged power to turn on the LED bulbs (26, 29). On a clear day, the LED bulb 26 is turned on by controlling the time that the LED bulb is turned on in the control circuit programmed based on the time zone of the actuator of the normal operation so as to light the photoconductive cell 21 attached thereto. After illuminating and sending a signal to the solar sensing circuit 31 and the motor control circuit 36 to advance the actuator 1, the LED bulb 29 is also turned on in the same manner to the photoconductive cell 24. It illuminates and transmits a signal to the motor control circuit 37 from the solar sensing circuit 34 to reverse the actuator 2. In this way, when the weather stops for a certain amount of time, the focus moves to the solar sensing port and returns to normal operation.

Here, in mid-latitude countries such as Korea, seasonal altitudes and azimuths vary greatly during the summer and winter seasons at sunrise, and they are out of the acceptable range to detect the angle of incidence with the solar sensor. In order to solve this problem, as shown in Fig. 8, the azimuth angle corresponding to the start time of each season is made in the support column 4 to make a track with horizontal grooves connecting the lower limbs at the same winter, and the azimuth control motor is used as a program control circuit. And the worm reducer moves one stroke for one year, the solar energy collecting panel and the actuator connected to the inner pipe (6) and the outer pipe (3) with one round bar on the disc (41) connected to the shaft of the worm reducer (42). By rotating the brackets, the azimuth is adjusted and the corresponding altitude is also controlled by the programmed control circuit.

Claims

Where the focal point of the cylindrical upper convex lens is formed, there are four solar sensing ports for detecting the movement of the focal circle and the sun, and a dimming filter at the bottom, and two LED lamps attached to the photoconductive cell case below. By arranging a pair of photoconductive cells diagonally, the actuator is configured to move forward and backward,

In the focal circle, there is a filter for illuminance adjustment, and four holes are formed in a cylindrical photoconductive cell case having a different diameter below to detect light in the sensing port. Photovoltaic biaxial tracking device using a photoconductive cell, characterized in that it further comprises.
The method of claim 1,

The two actuators, which move linearly to track the movement of the sun, are installed at right angles to the support column and the solar collector panel, and convert the linear motion into rotational motion with one fixed hinge and two movable hinges. ,

Photovoltaic cells that sense light using the photovoltaic sensing device are photovoltaic cells that turn on when light and turn off when dark, and motor control circuits where a pair of capacitors are installed in the blackout and reversing circuits for delayed operation when stopped. Photovoltaic 2-axis tracking device using a photoconductive cell, characterized in that to drive the focus to the focus source.
The method of claim 1,

The solar cell is installed on the solar energy collection panel with the power to turn on the LED bulb in the sunlight sensor, so that it can be driven in cloudy and sunny weather. After a certain period of time with the photovoltaic sensing circuit, when it is cleared again, the photovoltaic cell using the photoconductive cell, characterized in that to drive the actuator as long as the cloudy time by turning on the LED bulb with the programmed control circuit the power of the charged solar cell Axis tracking device.
The method of claim 1,

In the column supporting the solar energy collecting panel, make the azimuth of the operation start time to the horizontal groove connecting the winter and the lower ground, and move one stroke for one year by using the azimuth control motor and the worm reducer along the track. The round bar attached to the disk moves along the track, and the solar collector panel connected to the inner and outer pipes of the support pillar and the actuator bracket rotate together to adjust the azimuth angle and the corresponding altitude operation start time is controlled by the programmed control circuit. Photovoltaic two-axis tracking device using a photoconductive cell, characterized in that it further comprises an adjusting device for adjusting the altitude.