Solar tracking controller works

The existing automatic solar tracking controller is nothing less than the two ways: First, the use of a light-sensitive sensor with Schmitt trigger monostable Schmitt trigger, constitute light control or light control monostable to control the motor stops, turn; two light sensors two comparator constitute the two light-control comparator control motor Reversible. Due to the large range of changes in the strength throughout the year, sooner or later, and at noon the ambient light and sunlight, so the two controllers is difficult to Dayang receiving device seasons weather track the sun. As described herein, the control circuit also includes two voltage comparators, but provided at its input end of the photosensitive sensor, respectively, connected in series by two photoresistors cross combination.

 One for each set of two photoresistor comparator on the bias resistor, and the other only under the bias resistor; a detection sun light, and the other to detect ambient light, sent to the input terminal of the comparator comparison level is always a difference between the both light. Therefore, the controller enables the solar panel receiver device Four Seasons-weather track the sun, and debugging is very simple, the cost is relatively low.

Circuit schematic

Dual op amp LM358 R1, R2 constitute two voltage comparator reference voltage VDD (12V) 1/2. Photoresistor RT1 RT2 potentiometer RP1 and photoresistor RT3, RT4 potentiometer RP2 constitute photosensitive sensing circuit is special because of the circuit according to the ambient light intensity automatically compensated. Shown in Figure 2, the RT1 and RT3 mounted on the vertical side of the visor, RT4 and RT2 is mounted on the other side. When RT1, RT2, RT3 and RT4 by the environment at the same time natural light role, RP1 and RP2 the center point voltage constant. If only RT1, RT3 by sunlight, RT1 internal resistance decreases LM358 ③ foot potential rise (1) pin output high, the transistor VT1 saturated conduction, the relay K1 conduction changeover contacts closed contact 1. The RT3 internal resistance is reduced, LM358 the ⑤ foot potential decline, K2 does not operate its changeover contact with the stationary contact 2 closed, the motor M forward;

Similarly, If only RT2, RT4 by sunlight, relay K2 is conductive, K1 is turned off, the motor M is reversed. When the light intensity relative to a vertical on both sides of the visor, followed by the device K1, K2 conduction all pass, the motor M is stopped turn. In the the Sun constantly offset process, the strength of the illuminance on both sides of the vertical visor constantly change alternately, the revolutions of the motor M - stop, turn - stop, so that the the solar cell receiving means always facing the sun. 4 photoresistor cross such arrangements advantages: (l) LM358 ③ foot potential rise (5) feet potential decrease LM358 ⑤ foot potential rise (3) feet potential, the motor can be both positive and negative turn both simply and reliably; (2) can be directly used the housing of the mounting circuit board also serves as a vertical visor the photosensitive resistor RT2, RT3 avoid lead to trouble shield shade.

To use the device, you do not have to worry about the next morning, if it can automatically refunded. Morning at sunrise, the illumination on both sides of the vertical sun visor can not be exactly equal, this way, the control circuit to control the motor, thereby driving the receiving device eastward rotation until the solar charge controller receiver device so far at the sun.

Installation and commissioning

The structure shown in Figure 2 of the entire solar energy receiving means. Best to use doubles as a vertical visor shell material of non-reflective dark color, four photoresistor parameters consistent with the requirements, that is bright, the dark resistance equal and linear change. Installation, four photoresistor not protruding surface of the housing is preferably recessed point, to prevent the scattering of sunlight interference; vertical visor (i.e. control box) mounted on the edge of the receiving apparatus, both not subject to its rotation therewith reflected light strongly irradiation.

Withered trial, let the sun shine directly on four photoresistor, and then adjust the RP1 RI2 make LM358 two potential positive input end equal to and higher than the reverse transmission and 0.5 V people end-1V. After debugging and let the sun shine on the vertical sun visor, the receiving device can automatically track the sun.