8115

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Common Mode Chokes, also known as 8115 application field and working principle, refer to a type of electronic components that provide differential mode conductive filtering and inductive short-circuit protection. In the field of filter technology, common mode chokes have been applied in a wide range of applications.

The most common type of common mode choke is the three-centered coil, which consists of two-pole two-bobbin coaxial coils that are placed between two-pole shield plates and connected to two-pole unshielded conductors. This type of choke can provide the benefits of differential mode filtering and provide an inductive short-circuit protection whereas single-pole chokes are limited in this regard.

The basic principles that make common mode chokes effective are as follows:

• The two-pole two-bobbin coil sets up both a common mode and a differential mode flux field.
• The common mode field is generated by the difference in the magnetic flux generated by the two-pole windings.
• The two-pole shields are designed to allow differential mode signals to pass through while blocking common mode signals.
• The unshielded conductors connected to the chokes are also designed to allow differential mode signals to pass through while blocking common mode signals.

Common mode chokes are used in many applications, such as power supplies, headphone amplifiers, car audio systems, computer cases and laptop computers, and other electronic devices.

In power supply applications, common mode chokes are used to filter the high-frequency switching noise generated by the power supply. They are also used to reduce the electromagnetic interference (EMI) generated by the power supply. In these applications, the common mode choke is placed close to the switching element in order to reduce the amount of induced noise.

In headphone amplifiers, common mode chokes are used to reduce the amount of capacitive and inductive interference from the input signals. The chokes can also reduce the amount of noise induced from the amplifier itself.

In car audio systems, common mode chokes are used to filter out unwanted signals and improve the signal-to-noise ratio of the system. They can also reduce the amount of external EMI that is picked up by the system.

In computer cases and laptop computers, common mode chokes are used to filter out noise induced by the power supply or other components in the system. They can also reduce the amount of EMI generated by the computer itself.

Common mode chokes are a vital component of many electronic devices and provide the benefits of differential mode filtering and inductive short-circuit protection. They can be used in a variety of applications and reduce the amount of EMI and noise generated in the system.

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