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A common mode choke is a type of coil that uses a core to generate a magnetic field. It is usually made of a ferrite. This ceramic material has a low initial permeability and can reach 90 degrees at room temperature. It is then wrapped with wires. It is used in a variety of applications in industrial environments. These devices are also used in automobile CAN buses.
Several types of common mode chokes are available. A simple common mode choke contains two windings on a single core. The ring-shaped and U-shaped versions require manual winding. These are suitable for low-cost projects. A common mode choke with a crystalline core is more compact, has a wider range of frequencies, and is eight to ten times more effective than a ferromagnetic core.
A common mode choke is inserted between a transceiver and a power line wire. It will pass common-mode currents through the circuit, but it will also have some leakage flux between the windings. This flux can cause incomplete cancellation of the common-mode signal. In addition, it can couple back to earth ground, causing unwanted electrical noise. However, a properly sized choke will reduce these undesirable noises.
A common mode choke is typically used to filter out common-mode noise, which occurs when both inputs to a circuit generate noise simultaneously. It can be useful in EMI up to 30 MHz. In addition, a choke can be used to filter out low-frequency signals. Some chokes have a higher impedance at undesirable frequencies, reducing the noise.
A common mode choke will not saturate for very large DM currents. This is because the magnetic fields generated by the common-mode currents will cancel each other in the core. This results in no loss of differential mode signal quality. The maximum current rating of a common mode choke depends on the heating effect of the winding resistance. It is important to ensure that the winding resistance is not too high to prevent damage to the electronic equipment. A common mode choke is commonly used to suppress common-mode noise in high-speed power lines and other electronics. Its use is especially critical in the control area of a network.
Despite its advantages, a common mode choke can pose an issue for CAN bus systems. Because it captures common-mode noise, it can burn off line and neutral signal currents as heat. This can create extremely high transient voltages. It is advisable to install protection diodes on the transceiver bus pins to limit these transients. This can be done by moving the protectors to the transceiver side of the choke.
When choosing a common mode choke for your application, it is important to consider the number of turns and the frequency band. These factors will determine the inductance, or magnetic flux, generated by the currents. The more turns the coil has, the more magnetic flux it produces. The number of turns also determines the magnetic flux density. The lower the density, the less attenuation the choke will produce.
Toroidal Ferrite Core Common Mode Choke
Product parameters:
Different range of freuency from 50khz to 500khz
Compact desin,lighter weight with various mounting options
High rated current and high inductance values with a compact design
Better frequency response due to a low number of turns
Standard:
RoHS
UL 94 v-0
Compliant with RoHS
Plastic materials meet UL 94 v-0 requirements
