XP Inductors And Transformer

For inductance selection considerations in DC / DC switching converters, size, equivalent resistance, and current capacity typically determine differential mode choke coil selection, and can also include design factors such as cost, lead time, and technical support; and It is generally believed that under the same conditions, in order to reduce the internal lossesof the inductor device, the use of smaller ESR (equivalent series impedance) value of the inductor is the best. But the actual situation needs more consideration, this paper attempts to give a better compromise.

Inductors from common mode choke manufacturers can produce the role of inductive components collectively referred to as the inductance of the original, often directly referred to as inductance. It is the use of the principle of electromagnetic induction to work. Effect: resistance to AC flow through the DC, high-frequency resistance through the low-frequency (filter), which means that high-frequency signal through the coil inductance will encounter a lot of resistance, difficult to pass, and low-frequency signal through it presents resistance Relatively small, that is, low-frequency signal can be more easily through it. The inductance coil has almost zero resistance to direct current. The inductance is the ratio of the magnetic flux of the conductor to the current used to produce this magnetic flux, which is generated around the inside of the conductor when alternating current flows through the wire. When the DC current through the inductor, the surrounding only a fixed line of magnetic force, does not change with time; but when in the coil through the AC current, the surrounding will show a time-varying magnetic field lines. According to Faraday's law of electromagnetic induction - magnetic electricity to analyze the changes in the magnetic field lines at both ends of the coil will have an induced potential, the induction potential is equivalent to a "new power." When a closed loop is formed, the induced potential will induce an induced current. By Lenz's law to know the induction current generated by the total magnetic field lines to try to prevent changes in the magnetic field lines.

The inductor losses are due to its DC resistance (Rdc) and ac impedance (Rac). DC impedance is determined by the coil diameter, coil length is determined, AC impedance is ferrite core and GAP Department of leakage flux and copper wire interlocking each other eddy current loss. Generally in the DC / DC work, consider the current flowing through the inductor, the DC current loss.

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