Exactly speaking, the size of the magnetic bead should be that the characteristic curve of the magnetic bead depends on the frequency of the interference wave that needs to be absorbed by the magnetic bead. The magnetic bead is high frequency resistance, low for DC resistance and high for high frequency resistance. Because the unit of magnetic bead is nominal according to the impedance generated at a certain frequency, the unit of inductance and impedance is also ohm. The datasheet of the magnetic bead will generally be attached with the characteristic curves of frequency and impedance. Generally, 100 mhz is used as the standard, for example, 2012b601, which means that at 100 mhz, the speed of the magnetic bead is 600 ohms.
Extremes and values of folded inductance:
The value of inductance l is determined by the requirements of the load current to be maintained. The current flowing through inductor l is divided into continuous and discontinuous working conditions. In either case, as long as the input and output voltages remain unchanged, the slope of the current waveform will not change due to the reduction of the load current.
If the load current i gradually decreases, when the fluctuating current value in the inductance l is just zero, it is defined as the critical current ioc, then ioc should be equal to - half of the current peak to peak, that is
ioc=1/2△il
When io
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