Primary Coil (Input):
Assuming a primary voltage of 220 volts and a primary voltage of 240 volts, the number of turns in the primary coil can be calculated using the turns ratio formula:
Turns ratio = Output voltage / Input voltage
Since the output voltage is 12 volts, the turns ratio is:
Turns ratio = 12 V / 220 V ≈ 0.0545
Considering a margin for safety and losses, we can take the primary turns to be around 55 turns.
Secondary Coil (Output):
To calculate the number of turns in the secondary coil, we can use the same turns ratio formula:
Turns ratio = Output voltage / Input voltage
Therefore, the secondary turns can be calculated as:
Secondary turns = Turns ratio * Primary turns
Substituting the calculated turns ratio and the primary turns of 55, we get:
Secondary turns = 0.0545 * 55 ≈ 3 turns
It's worth noting that these values are approximate and may vary depending on the specific design and desired performance of the battery charger. Factors like current rating, efficiency, and transformer core material can influence the exact number of turns required.
For a battery charger with specific current requirements, you may need to adjust the turns ratio and calculate the number of turns accordingly to achieve the desired output current and voltage.
