Unicreed Blog

Transformers classified as Class II or Class III are used for circuits classified as Class II or Class III, respectively, according to the National Electrical Code, ANSI/NFPA 70. The main purpose of these connectors is to connect sinusoidal power supplies.

Laminating steel sheets are commonly used for transformer cores. Laminating containing silicon has a silicon content of 0.8%~4.8%. Due to the fact that laminate steel is a magnetic material with strong magnetic permeability, silicon steel is used as the iron core of the transformer.

Generally, bobbin transformers are two-winding transformers in which the primary and secondary coils are wound side by side on separate bobbin separated by an insulating barrier to create a two-winding transformer.

Among the transformer losses there are iron losses, copper losses, hysteresis losses, eddy current losses, stray losses, dielectric losses, and other types of losses. In transformers, hysteresis losses are caused by changes in the magnetic field of the transformer core, whereas copper losses are caused by the resistance of the transformer windings.

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Transformers with high frequency exceeding the intermediate frequency (10 kHz) can be used in high-frequency switching power supplies as high-frequency switching power supply transformers.

A transformer’s primary winding generates magnetic flux, which flows in the iron core. Since the iron core is also a conductor, an electric potential is established on the plane perpendicular to the magnetic field lines, resulting in the creation of an “eddy current”.

Transformers convert one AC voltage to another without changing the frequency. One or more coils are wound on a common ferromagnetic core, and are not electrically connected but are connected by a common magnetic flux.

In an ideal transformer, the output power is equal to the input power. There is no loss of power within this transformer due to its 100% efficiency. This type of transformer is impossible to exist in practice, but the ideal transformer model makes the problem easier to solve compared with the practical transformer model.

A major difference between a forward high-frequency transformer and a flyback high-frequency transformer lies in the fact that the forward transformer does not require any air gaps, and it is also required to have a large inductance. Primary side current also flows through the forward transformer, but this current is not induced by the secondary side inductance, but is stored by the input voltage.