XP Power (China) since its inception, has been committed to research and development, production of high-quality high-frequency transformers, switching power supply transformers, magnetic coil, filters, inductors , choke coils and other magnetic components. Our products are widely used in switching power supply, medical equipment, communications equipment, aerospace, industrial equipment, household appliances, digital products, automotive electronic equipment, LED drive circuit, inverter, converter, rectifier, computer power supply, power adapter field.
Magnetic ring coil manufacturer tells us how to choose the number of turns of magnetic coil:
The number of coil turns of the magnetic loop coil is very important in the selection and must be very careful. If you choose not properly, it will cause the machine does not work, affecting the efficiency of production.
Passing the entire cable through a ferrite bead forms a common mode choke coil . If necessary, the cable can be wound several turns above the magnetic ring. The more the number of turns, the lower the interference of the lower frequency of the better, while the higher frequency of noise suppression is weak.
In the actual project, according to the frequency characteristics of the interference current to adjust the number of turns of the magnetic ring. Usually when the frequency band of the interference signal is wide, two magnetic rings can be set on the cable, each magnetic loop around the different number of turns, which can suppress high frequency interference and low frequency interference. From the mechanism of common mode choke effect, the greater the impedance, the more obvious the effect of interference suppression.
The common mode choke impedance from the common mode inductance Lcm = jwLcm, from the formula is not difficult to see, for a certain frequency of noise, the greater the better magnetic ring inductance. But the actual situation is not the case, because the actual magnetic ring there are parasitic capacitance, it exists in parallel with the inductor. When encountering high-frequency interference signal, the capacitive capacity of the small, short-circuit the inductance of the magnetic ring, so that the common mode choke loss.
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