Calculation of SMD Inductance

The inductive reactance XL of the chip inductor and the inductive reactance XL are generally not found in the inductive component parameter table, but it is closely related to the parameters such as the inductance and the quality factor of the inductive component, and is often used in the analysis circuit. So here's a special introduction. As already mentioned, since the self-induction potential of the inductor coil always prevents the current change in the coil, the coil has a resistance effect on the alternating current, and the resistance is expressed in the inductive reactance XL. It is easy to see that the XL is small when the coil passes through a low-frequency current. When the direct current is passed through, XL is zero, and only the DC resistance of the coil acts as a resistance. Since the resistance is as small as possible, it is approximately short-circuited. XL is large when a high-frequency current is passed, and if L is large, it is approximately open-circuited. This kind of characteristic of the coil is just opposite to the electric capacity, so can use the inductance component and the condenser to make up various high-frequency, intermediate frequency and low-frequency filter, and tune the circuit, choose frequency circuit and choke circuit,etc..

Chip inductance inductance calculation:

The inductive reactance of the chip inductor, the English abbreviation XL, and the inductive reactance XL of the chip inductor are generally undetectable in the parameter table of the inductive device, but the inductive reactance XL and Q of the chip inductor are also the inductance and inductance components. The classification quality factor and other parameters are closely related and often need to be used during the analysis of the circuit. Therefore, here are some simple introductions.

We already know that because the self-induction potential of the inductor coil always prevents the change of current in the coil, the seat coil has the effect of resistance to the alternating current, and the magnitude of the resistance is represented by the inductance XL of the chip inductor. The inductive reactance XL of the chip inductor is proportional to the inductance L of the coil and the frequency f of the alternating current.

The formula is: XL (Ω) = 2 лf (Hz) L (H).

XL is the inductance of the chip inductor:

f is the frequency of alternating current flowing through the chip inductor;

Therefore, it is not difficult to see that the inductive reactance of the chip inductor is small when the inductor coil passes a low-frequency current. The inductance XL of the chip inductor is zero when passing through the direct current, and only the DC resistance of the coil acts as a resistance, because the resistance is as small as possible, so the short circuit is approximated. The inductive reactance of the chip inductor XL is large when the high-frequency current is passed. If L is large, the inductance is approximately open. This characteristic of the inductor coil is just the opposite of the capacitor, so a variety of high-frequency, intermediate-frequency and low-frequency filters, tuned loops, frequency selective loops, and choke coil circuits can be formed by using the inductance element and the capacitor. Wait.