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The main source of differential mode noise and common mode noise
For the switching power supply, if the large capacitor of the energy storage filter after the rectifier bridge is an ideal capacitor, that is, the equivalent series resistance is zero (ignoring all parasitic parameters of the capacitor), all possible differential mode noise sources input to the power supply will be affected by this Capacitors are completely bypassed or decoupled, but the equivalent series resistance
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Common Mode Inductance Principle
Before introducing the common mode inductance, first introduce the choke coil. The choke coil is a low impedance coil used to attenuate the high frequency current in the circuit. In order to improve its inductance choke coils usually have a core made of soft magnetic material. Common mode choke coils have multiple identical coils in which current flows in opposite directions, so the magnetic fields cancel out in the
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Material cost of Shielding Material
Raw materials account for more than 70% of the cost of electromagnetic shielding and thermal conductive devices, and the gross profit margin is mainly affected by fluctuations in raw material prices. Due to the rich variety of electromagnetic shielding and thermal conduction devices, there are many types of raw materials required, including stainless steel, copper, aluminum and other metal materials and non-metallic
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Material application of Shielding Material
Electromagnetic shielding and thermal conductive materials and devices are in the middle of the industry chain. The upstream is plastic pellets, silica gel blocks, metal materials, cloth and other basic raw materials, and the downstream is communication equipment, computers, mobile terminals, automotive electronics, household appliances, and defense industries. end user. Among them, the electromagnetic shielding and
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Shielding Material | Conformal Shielding
Recently, a new shielding technology, conformal shielding, has emerged. Different from the traditional EMI shielding method of mobile phones using metal shields, the conformal shielding technology completely integrates the shielding layer and the package, and the module itself has Shielding function, after the chip is mounted on the PCB, there is no need to add a shielding cover, and it does not take up additional eq
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