CURRENT SENSOR PWM CHARGE CONTROLLER
ZERO DROP SOLAR CHARGE CONTROLLER USING PIC16F876A (WITH ACS712 CURRENT SENSOR)
ZERO DROP SOLAR CHARGE CONTROLLER
PROJECT DESCRIPTION:
This circuit degisn is called ‘zero drop PWM solar charge controller’ because it doesn't have any diode drop of 0.65v.This is a mosfet based design which has very negligible voltage drop of 0.05v or less which means the loss is very less, ideal for solar applications.
NOTE : This design has a current sensing features with the aid of (ACS712 CURRENT SENSOR)
Since the drop is less, the losses are minimised so the efficiency achieved is > 99.5%
In this circuit design, two n - channel mosfets are connected in such a way that their sources become common and the drains will be connected to the negatives of battery and solar panel respectively and the gate will be triggered by the microcontroller (pic16f876a).
The positives of solar panel and battery will be joined directly and the circuit is powered from that joint.
When the solar power was present the circuit gets activated and micro-controller will pumps the signals that will be enough to trigger the gate of mosfet, when the gate was triggered the negative voltage will flow through the mosfet and then the battery will be charged through solar panel.
Specification:
Voltage 12v - 96v dc
Current 10A - 75A
Efficiency > 99.6%
Protection against : Panel reverse
Battery reverse
Battery Overcharge ( full charge cut - off level can be set )
Charger is monitored - 16 x 2 lcd display
Other feature - Opto - Coupler output for Charging signal to external circuits (like inverters)
FIG1
FIG 3
FIG 4
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