Understanding RL Filters
RL filters use a resistor and inductor to filter frequencies. Unlike RC filters, RL filters can handle higher currents and are commonly used in power applications, switching power supplies, and EMI filtering.
How RL Filters Work
Low-pass (output across R): At low frequencies, inductor has low impedance, allowing signal through. At high frequencies, inductor impedance increases, blocking signal.
High-pass (output across L): At low frequencies, inductor blocks signal. At high frequencies, inductor passes signal to output.
Время Constant
The RL time constant τ = L/R determines response speed. Unlike RC circuits where τ affects напряжение, in RL circuits τ affects current buildup through the inductor.