In our common electronic components, SMT inductance is a common, patch application is very wide, but SMT inductance used in circuit functions are the same, SMT inductance it has two basic functionality is the resonant circuit and choke reactance, the following as we specifically about SMT inductance are two basic functions used in the circuit.
The SMT inductor is used for choke filtering and high frequency clutter elimination. It has the function of energy storage. It is used for power filter loop, focusing on the suppression of conductive interference.Inductive elements and filter elements are widely used in PCB board circuits of electronic devices.
Such as SMD inductance.The advantage of surface mount components is the small package size and the ability to meet the actual space requirements.Except for impedance, current carrying capacity and other similar physical characteristics, the performance characteristics of the through-hole connector and the surface mount are basically the same.
When SMD inductor is used in the circuit, the inductor is required to realize two basic functions: circuit resonance and choke reactance.Resonance circuit includes resonance generator circuit, oscillation circuit, clock circuit, pulse circuit, waveform generator circuit and so on.
The resonant circuit also includes a high Q band pass filter circuit.To make the circuit resonant, both SMT capacitor and SMD inductor must exist in the circuit.
Parasitic capacitance exists at both ends of SMT inductance, which is caused by the fact that the ferrite body between the two electrodes of the device corresponds to the capacitive medium.
In resonant circuit, the inductance must have a high Q, small tolerance, stable temperature coefficient, in order to meet the resonant circuit narrowband, low frequency temperature drift requirements.High Q circuit has sharp resonance peak.
The inductance offset with small tolerance ensures that the resonance 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 inductance and axial inductance and SMD inductance is only in package.
The SMT inductance structure consists of a coil wound on a dielectric material (usually an alumina ceramic) or a hollow coil wound on a ferromagnetic material.
In power inductance applications, when used as a choke coil, the main inductance parameters are dc resistance (DCR), rated current, and low Q value.
When used as a filter, it is necessary to look at the broadband characteristics, and therefore, the high Q characteristics of the inductor are not required.A low DCR, defined as the element's dc resistance in the absence of an ac signal, guarantees the minimum voltage drop.
Post time: Oct-16-2019