The difference between SMD inductors and SMD magnetic beads
SMD power inductors are essentially different from SMD magnetic bead inductors. The magnetic beads convert the AC signal into heat energy, and the inductor stores the AC and then slowly releases it. Therefore, the SMD inductor is an energy storage element, while the SMD Magnetic beads are energy conversion devices.
Chip inductors: Inductive components and EMI filter components are widely used in the PCB circuit of electronic equipment. These components include chip inductors and chip beads, let's talk about the fucking features and differences. The benefits of surface mount components are very obvious, that is, the small package size and the ability to meet the actual space requirements. With the exception of impedance value, current-carrying capacity, and other similar physical properties, the other performance characteristics of through-hole connectors and surface mount devices are basically the same. Where chip inductors are required, the inductors are required to perform the following two basic functions: circuit resonance and choke reactance. Resonant circuits include resonance generating circuits, oscillator circuits, clock circuits, pulse circuits, waveform generating circuits and so on. The resonant circuit also includes a high-Q bandpass filter circuit. For a circuit to resonate, both capacitance and inductance must be present in the circuit. There is parasitic capacitance at both ends of the inductor, which is caused by the ferrite body between the two electrodes of the device acting as a capacitive medium. In the resonant circuit, the inductor must have high Q, narrow inductance deviation, and stable temperature coefficient in order to meet the requirements of narrow band and low frequency temperature drift of the resonant circuit. High-Q circuits have sharp resonance peaks. The narrow inductance bias ensures that the resonant frequency deviation is as small as possible. The stable temperature coefficient ensures that the resonant frequency has stable temperature variation characteristics. The difference between standard radial and axial lead-out inductors and chip inductors is only in the packaging. Inductor structures include coils wound on dielectric materials, or air-core coils and coils wound on ferromagnetic materials. In power applications, when used as a choke coil, the main parameters of the inductor are DC resistance, rated current, and low Q value. When used as a filter, a wide bandwidth characteristic is desired, and therefore, the high-Q characteristic of the inductor is not required. Low DCR ensures minimum voltage drop, DCR is defined as the DC resistance of a component in the absence of an AC signal.
2. SMD magnetic beads: The function of chip magnetic beads is to eliminate the RF noise existing in the transmission line structure. The RF energy is the AC sine wave component superimposed on the DC transmission level, and the DC component is the required useful signal, while the Radio frequency RF energy is useless electromagnetic interference transmitted and radiated along the line. To remove these unwanted signal energy, chip beads act as high-frequency resistors that allow DC signals to pass through while filtering AC signals. Usually high frequency signals are above 30MHz, however, low frequency signals are also affected by chip beads.