- 1). Find the number of turns in the primary winding. Call this value N1. Refer to the transformer specification sheet.
- 2). Find the number of turns in the secondary winding. Call this value N2. Refer to the transformer specification sheet.
- 3). Calculate the transformer ratio by dividing N1 by N2. For example, if N1 is 300 turns and N2 is 100 turns, the transformer ratio is: 300/100 = 3 to 1 or 3:1.
This ratio means if you have a primary voltage of 600 volts, the voltage on the secondary will be 200 volts (600/3). - 4). Choose the transformer ratio you want to achieve. For example, to increase the voltage of the transformer, you need to increase the transformer ratio to reflect a high voltage on the output side. If instead of getting only 200 volts with a 600-volt input, you want to get 400 volts, your new ratio will be 600/400 or 1.5 or 1.5:1.
- 5). Modify the transformer turns by changing N2 to reflect the new ratio. Use the formula N2 = N1/new ratio. Continuing with the example and assuming the new ratio is 1.5:1:
N2 = 300/1.5 = 200 turns.
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