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How to test the performance of SMD power inductors?

An effective method for SMD performance testing is to place the tested inductor on the final switching power supply circuit, and then measure the efficiency of this circuit. The role of inductance in the resonant circuit, the use of low-loss magnetic core can be regarded as a resonant circuit. The inductance of the chip inductor refers to the nominal value of the inductance of the frequency measurement required by the product technical specification. SMD inductors are relatively stable when used in circuits. According to some related tests, our company has found that the frequency of use of SMD inductors is not high, but the performance is really high. SMD inductors can achieve low resistance when used in circuits. Value and high temperature resistance.

The function of the general chip inductor in the circuit is to hinder the function of the current. The inductance hinders the current change process and does not consume electric energy. When the current increases, it temporarily stores the electric energy in the form of a magnetic field. When the current decreases, it also The release of the energy of the magnetic field, as a result, is to hinder the change of the current. When the SMD inductance coil is connected to the AC power supply, the magnetic field lines inside the coil will change constantly with the alternating current, causing the coil to continuously produce electromagnetic induction. This kind of electromotive force generated by the change of the current of the coil itself is called "self-induced electromotive force". The patch inductance is just a parameter related to the number of turns, size and shape of the coil and the medium. It is a measure of the inertia of the inductor and has nothing to do with the applied current. When a direct current is passed through the chip inductor, there are only fixed magnetic lines of force around it, which does not change with time; but when an alternating current is passed through the coil, it will show magnetic lines of force around it that change with time.


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