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Battery Chargers at Arya Electronics And Controls
We are Manufacturer, Supplier, Exporter, Designer, Services Provider of Battery Chargers, Industrial Battery Chargers, 12V 6A Battery Chargers, 12V / 10A Battery Chargers, 24V 5A Battery Chargers and our set up is situated in Pune, Maharashtra, India.
In this article, we understand a simple flyback based converter design which is executed as an SMPS 12V, 5amp battery charger power supply, without using an iron core transformer.
Since pulsed DC is good for Lead Acid battery, a low-value smoothing capacitor is used as C1.To monitor the charging status, Ampere meter is provided in the positive rail. The LED works as the Charger on status.
How it Works
When switched ON, the 470k resistor charges the MOSFET gate into conduction and begins the switching action.
The mentioned action induces a voltage across the auxiliary winding of the transformer which results in a feedback voltage to the MOSFET gate via the 2n2/100V capacitor making the MOSFET to conduct even harder.
Right after this happens, the primary winding gets connected with the full 310V DC rectified voltage through the MOSFET drain/source terminals.
During this process being carried out, the voltage across the 0.22-ohm resistor located at the MOSFET source tends to cross the 0.6V level, which immediately triggers the transistor BC546, which shorts the gate of the MOSFET to ground, providing it completely switched OFF.
This also makes sure cutting-of the auxiliary feedback voltage, restoring the entire primary section to its original switched OFF state.
The cycle now begins afresh and is switched continuously at around 60kHz rate which may be varied by increasing or decreasing the values of the 2n2 feedback capacitor and the 100pF base capacitor of BC546 NPN.
During the switched OFF time spans of the primary winding, an induced equivalent back emf is transferred to the secondary winding which translates it into the designated stepped down low voltage, high current secondary output.
The above secondary output is correctly rectified and filtered by the high current diode and a filter capacitor.
A feedback stage across the secondary and the primary stages is implemented via an optocoupler which finds out the required fixed, regulated output voltage.
Either by modifying the secondary wire thickness of the transformer or by tweaking the value of the 0.22-ohm resistor placed across the source/ground terminals of the MOSFET.
Features
BATTERY CHARGER : 12V-6A
BATTERY CHARGER : 12V-10A
BATTERY CHARGER : 24V-5A
