SMD Inductors

SMD Inductor is an electromagnetic induction component wound with insulated wire. It is a commonly used inductance element. The role of the smd inductor: through DC to prevent AC This is a simple term for AC signal isolation, filtering or with capacitors, resistors and other resonant circuit. The function of tuning and frequency selection inductor: inductor coil and capacitor in parallel can form LC tuning circuit. Any current in the circuit of the smd inductor will generate a magnetic field, and the magnetic flux of the magnetic field will act on the circuit. 

When the current through the patch inductor changes, the DC voltage generated in the patch inductor will prevent the current from changing. When the current through the inductor increases, the inductor generates a self-induced electromotive force in the opposite direction of the current, which prevents the increase of the current and converts part of the electric energy into magnetic field energy stored in the inductor. When the current through the inductor is reduced, the self-induced electromotive force moves in the same direction as the current, preventing the current from decreasing while releasing stored energy to compensate for the current reduction. Therefore, after inductance filtering, not only the pulsation of load current and voltage decreases, the waveform becomes smooth, and the conduction Angle of the rectifier diode increases. 

The role of inductance 1: color ring inductance has a choke effect: the copper core in the color ring inductance coil is always resistant to the current change in the coil. The inductance of the color ring has a blocking effect on the AC current used in the circuit. The size of the blocking effect is called inductive reactance XL, and the unit is ohm. The relation between the inductance L and the alternating current frequency f is XL=2πfL. The inductance of color ring can be mainly divided into high frequency choke coil and low frequency choke coil. 

Function of inductance 2: color ring inductance has tuning and frequency selection function: color ring inductance and electrolytic capacitor in parallel can form LC tuning circuit. When the color ring inductance resonates, the inductance and capacitive reactance of the circuit are equivalent and reverse, that is, the natural oscillation frequency of the circuit f0 is equal to the frequency of the non-AC signal f, then the inductance and capacitive reactance of the circuit are equal. The use of color ring inductance is generally not very high, and the color ring inductance used in the circuit is generally more stable. 

The role of inductance 3: the maximum value of color ring inductance is mainly used to screen signals, filter noise, stabilize current and inhibit electromagnetic wave interference. The basic function of color ring inductor is to charge and discharge, but many circuit phenomena which are extended by this basic charge and discharge function make color ring inductor have various uses. Now color ring inductance has been used by the majority of customers, the role of small inductance is not insignificant.