In this ppt, we’re going to take a closer look at broadband transformers, their purpose & how they use ferrites to boost their operations.

2. All You Need To Know About Ferrites in
Broadband Transformers

3. Broadband Transformers are magnetic systems used to
transfer energy over different frequencies. They are wound
on ferrite cores, such as toroidal cores & POT cores for their
higher permeability, higher efficiency, excellent RFI
performance, good frequency response, & no leakage
magnetic flux. One of the common applications of these
transformers is telecommunication equipment, where they
are used widely at low power levels.
In this blog, we’re going to take a closer look at broadband
transformers, their purpose & how they use ferrites to boost
their operations. Let’s get started!

4. Types of Broadband Transformers
1. Conventional Transformers: These transformers transfer electrical
energy from one circuit to another at a similar frequency but at
different voltage. Their work is based on the principle of
electromagnetic induction. They’ve two windings- primary &
secondary, similar to power & audio transformers.
2. Transmission Line Transformers: These transformers are usually
wounded on ferrites or powdered iron cores while using parallel
windings. They are more efficient than the conventional ones. For
example, balun transformers.

5. Purpose of Broadband Transformers
Broadband transformers are meant to work in different frequencies
where both XL or XC have their unique one or more frequency ranges.
For this, you need to use ferrite cores with high-permeability that
have small windings as desired for the MF & HF spectrums. When the
operating frequency increases, the core becomes obvious to the
circuit.
An important parameter in transformers is shunt reactance, which
increases with frequency. But this only happens if the permeability of
the material is constant or decreasing at a rate lesser than the
increase in frequency.

6. How are Ferrites used in Broadband Transformers?
Ferrites are the most appropriate & cost-effective material used in
broadband transformers. They provide the highest impedance in the
frequency of unwanted noise signals & always have a high initial
permeability at lower cut-off frequency.
Usually, ferrites are selected depending on their characteristics, such
as the ease of winding, terminating & some technical design
constraints of the transformer.
For example, Manganese Zinc (MnZn) ferrites are suitable for the low
& medium frequency transformer designs. When these ferrites are in
the broadband transformers, the core geometry should be the ratio
of DC resistance to the inductance for a single turn, which is
minimum.

7. For transformers that have an overlaying direct current, gapped
ferrite cores can control the reduction in shunt inductance.
On the other hand, high-frequency transformers are well-suited with
toroidal core-shaped ferrites. A few turns that are needed can be
wounded on the toroid. But keep a note that windings with lesser
turns lead to issues in obtaining the desired impedance ratios. To
minimise the leakage inductance, the primary & secondary windings
are coupled.

8. Thank You
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