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A welding machine, a microwave oven, a computer, a power supply, a TV are such different electrical appliances, but each of them has a transformer. How to ring the windings and measure the voltage produced by the blackhawk supply transformer, how to calculate the permissible power and what is the no-load current – questions to which you will receive comprehensive answers and several practical tips for working with transformers.

How to calculate transformer windings

In this example, 220/18 = 12.22 is the ratio of the number of turns of the windings and this is the value of the transformation ratio.

Knowing the transformation ratio, this number can be used to calculate the number of turns of the transformer. If you change the windings, that is, apply 220 volts to the secondary winding, with the primary you get 2688 volts – but it is recommended, the trans will burn out immediately or knock out the machine in the dashboard.

Let’s say you know that there are 2200 turns in the primary winding of the trance, and how many turns should there be in the secondary winding to get 18 volts? It’s simple, 18 (voltage in volts) * 12.22 (transformation ratio) = 220 turns.

How to distinguish the primary from the secondary in a transformer

There are three main features of the primary winding of a transformer:

  • In a step-down transformer, the resistance of the primary winding is significantly higher than that of the secondary.
  • As a rule, the primary winding is wound with a thinner wire.
  • The primary trance winding is wound closer to the magnetic circuit to increase the efficiency of the transformer.
  • If the transformer is soldered into the circuit, you can look at the terminals. In the secondary winding, as a rule, a diode bridge is turned on, followed by a large electrolytic capacitor (from 1000 μF).

How does a transformer work?

The simplest transformer is two independent windings connected by a magnetic circuit. A magnetic field is created in the first winding, then it is transmitted through the magnetic circuit to the second winding, in which, depending on the transformation ratio, it increases or decreases.

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