EMI
problem arise due to the sudden change in voltage dv/dt or
current/dt levels in a waveform
.For example in diode rectifier the line
current can be pulses of
short duration and the diode recovery current pulse can generate transient
voltage spikes in the line inductor
A
conductor carrying a high dv/dt
wave acts an
antenna and radiated high
frequency wave may coupled to
a sensitive signal
circuit and appear a noise(radiated EMI) or a parasitic coupling
capacitor may carry this
noise signal through the ground wire(conducted EMI)
similarly di/dt
The EMI problem
create communications line
interference and malfunctions to
sensitive signal electronic circuit. Proper shielding, noise
filtering, careful equipment is
lay out ,and grounding can solve
EMI problems
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