HF2018R-252Y1R3-01

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Common Mode Chokes

Common mode chokes are a type of inductor devices used to suppress electromagnetic interference (EMI) and radio frequency interference (RFI) by limiting the current in a circuit. The HF2018R-252Y1R3-01 is a common mode choke designed to prevent common mode noise from interfering with circuits or devices, to prevent electrical devices from interfering with each other, and to limit electrical power in a circuit.

Application Field

The HF2018R-252Y1R3-01 common mode choke is used in multiple applications. This type of electric component is effective in reducing EMI in high frequency switching power supplies, power line current filter, AC-DC and DC-DC converters, air conditioning power input lines, and many other power electronics applications. In addition, the HF2018R-252Y1R3-01 choke is often used in communication systems, electric traction control systems, hybrid electric vehicles, and home entertainment equipment.

Working Principle

The HF2018R-252Y1R3-01 works together with power semiconductors to reduce common mode noise from the system. The common mode choke’s core is composed of ferrite material, and the magnetic flux formed is linked to two or more coils. Common mode noise is generated when two conductors of the same circuit exchange differential mode signals under the driving of power switching devices. In this case, the coil generates inductive interference, which is superimposed on the ground potential, causing a phenomenon of "ground potential rise." This type of noise is the main culprit of interference problems in electrical circuits.

The way the HF2018R-252Y1R3-01 works is by connecting two coils in series. Then, current is fed into the coils in the same direction and magnitude. As the current flows through the choke, it produces a magnetic flux which links the two coils, forms a closed loop and generates an opposing voltage called an inductive voltage. This inductive voltage has the effect of canceling out the potential differences between the two circuit lines, reducing and even eliminating the common mode interference.

In addition, the HF2018R-252Y1R3-01 choke is designed to have high impedance in common mode and low impedance in differential mode. This allows the choke to limit current generated by interference signals, while allowing normal signals to pass through without impedance.

Conclusion

The HF2018R-252Y1R3-01 common mode choke is a type of electric component used to reduce undesired electromagnetic interference in various power electronic applications. It does this by connecting two coils in series and feeding a current into them in the same direction and magnitude. This produces an inductive voltage which cancels out the potential differences between the two lines, thereby reducing or eliminating the common mode interference.

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