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Types of High Frequency Transformers
A High Frequency Transformer (HFT) is a transformer that operates at high frequency. It has fewer turns and a smaller cross-sectional area than a Low Frequency Transformer. It also experiences lower core losses. High Frequency Transformers operate on the linear portion of the B-H curve, while Low Frequency Transformers operate on the non-linear portion of the curve.
High Frequency Transformers are used to transfer large amounts of electrical power. Their size depends on the amount of energy they need to transfer. They range from large to small in size, and the higher the frequency, the smaller the transformer. These transformers can handle high voltages (up to 15,000 volts) safely and are ideal for power supplies, laser equipment, and particle accelerators.
In practical applications, heat can cause damage to the transformer's components. It can be caused by a loss in the copper, or by a loss in the magnetic core. The primary winding should have the shortest turns in order to minimize this problem. This reduces the amount of heat that can build up in the windings.
The actual power of the transformer is governed by its flyback topology and the actual current density of the windings. The wire diameters must also be chosen considering skin effect. The secondary and feedback windings can be located close to the magnetic core, while the primary winding can be placed in the outermost position. This is beneficial for the magnetic core.
Another type of transformer is the pulse transformer, which works in a transient state. It works by converting an alternating signal into a pulse signal. It works on the principle of electromagnetic induction. The primary winding of the transformer receives an alternating voltage, which then induces an output voltage in the secondary winding. The pulse transformer, therefore, transmits energy and transforms voltage while isolating.
The pulse transformer uses magnetic saturation of the iron core to transform input sine wave voltage to narrow pulse shaped output voltage. It is a common type of HFT used in modern applications. Various designs and materials are available for HFTs. However, these transformers have many challenges. For example, high power applications have difficult insulation requirements and thermal breakdown issues.
Gate Drive Transformers provide isolation and reliability while driving semiconductor gates and electronic switching devices. Push-Pull transformers are similar to buck boost transformers, but they can produce multiple DC output voltages and apply power directly to the load. Finally, Resonant Converters have high frequency capability and can be used in radio applications.
EE20 0.5VA 115V 9V Vacuum PCB Isolation Transformer
· Core Type EE20/6
· Power - 0.35VA
· Input voltage - 230V or 115V, 50/60Hz
· Insulation class - Class B (130°C)
· Ambient temperature (ta)- 70°C
· Dielectric strength - 4, 500Vrms
·Inherently short-circuit-proof
· Self-extinguishing material
· Potted under vacuum
· Weight: 25g
Power adapter /Chiller plant / War industry