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SCC2 solar charge controller circuit diagram

2015-03-01 12:57  
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The article said the solar charge controller SCC2 circuit diagram. The drive efficiency is very high, the principle is simple and very practical. Want more thoroughly grasp the principle, you should understand and be familiar with the major components of the circuit, such as: TLC2272CP .
We introduce a solar-powered SCC2 controller, its function is to regulate the power flow from the solar panel into a rechargeable battery. It features simple to set up a floating voltage adjustment potentiometer, a balance function and automatic temperature periodic charges is too high, better charging temperature compensation scope.
The SCC2 ACTS as a medium power dc current switch terminal between PV and battery. Diode D1 prevent reverse current from the battery at night time back to the photovoltaic panels.
When the pv voltage is high enough, rechargeable batteries, and open the transistor Q2 zener diode D2. Q2 switch power for the rest of the circuit. This circuit is turned off at night. IC2 provides a 5 v voltage comparator circuit power, it also provides a reference voltage, the comparator IC1a.
When the battery voltage is less than the full voltage, the need to recharge, comparator IC1a open and activate the Q1 and Q3, which makes the solar charging current into the battery. Please note that the third quarter is a p-channel mosfet, which makes the circuit is connected to a common ground for solar panels and batteries. Solar current loop is to draw on the heavy line diagram.
When the battery reaches full charge points, IC1a operated as a comparator, which is based on the Schmitt trigger oscillator intermittent solar power switch current. Switch the battery voltage swing above and below the required set point of dozens of millivolt. A rail-to-rail operational amplifier for correct operation, 741 will not work in the style of amplifier circuit.
Charging the red/green/full IC1a and IC1b between the output of the LED driver. IC1b IC1a signal fall edition. Pin may only need one approximate center IC1b to work as a comparator switch, it is connected to different IC1a pin 2, so that it does not need another reference frequency divider circuit.
The resistor and the input end of the thermistor IC1a form resistance bridge circuit, used to compare the battery voltage to a reference voltage from IC2 / R8 / R9. The potentiometer to adjust the voltage oscillation in full charge points around the circuit. Positive feedback resistor R7 IC1a added as the characteristics of a Schmitt trigger. Provide thermal compensation of thermistor, temperature drops, full voltage rise.
This compensation switch, circuit S1a, troops in deliberately overcharging. Switch and R1, however can be used to select a different floating voltage range, you can try to through the use of different values, usually R1 R1 should be greater than 1 m. 

The SCC2 kit has sold out, it has been replaced by the higher currentSCC3.

SCC2 Circuit Board


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