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Transformers (Transformer) is the use of the principle of electromagnetic induction to change the AC voltage means the transformer primary winding is the main component, the secondary coil and core (core). The main features are: voltage conversion, the current conversion, impedance transformation, isolation, voltage regulator (magnetic saturation transformer) and the like. By end-use can be divided into: power transformers and special transformers (EAF change, rectifier transformer, frequency test transformer, voltage regulators, mine changed, audio transformers, intermediate frequency transformers, high frequency transformer, impulse transformers, instrument transformers, electronic transformers , reactors, transformers, etc.). Commonly used as a circuit symbol T number of cases beginning:. T01, T201 and so on.
 The transformer core (or cores) and coil, the coil has two or more windings, wherein the power supply is called the primary coil winding, the secondary winding is called the rest of the winding. It can convert AC voltage, current and impedance. The simplest core transformer consists of a core made of a soft magnetic material and set in the core of the two turns varying coil.
 
 
The role of transformer core principle is to strengthen the magnetic coupling between the two coils. In order to reduce the eddy current and hysteresis losses within the iron, silicon steel core made of laminated by a painted; no electrical connection between the two coils, the coils by the insulated copper (or aluminum) wound. A coil connected to AC power is called the primary coil (or primary coil), other coil called a secondary coil connected to electrical (or secondary coil). The transformer is actually very complicated, inevitably copper loss (resistance heating coil), iron loss (core heat) and magnetic flux leakage (air-closed magnetic flux lines), etc., in order to simplify the discussion here only ideal transformer. Conditions are ideal transformer establishment: Ignore the leakage flux, ignoring the resistance the primary and secondary coils, ignoring core loss, ignoring the no-load current (open primary coil secondary coil current in the coil). Such as power transformer at full load runtime (secondary coil output rated power) that is close to the ideal transformer case.