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Module 7: Resonance

Parallel Resonant Circuit

Let \( I=1 \text{ A}\angle 0^\circ \); Set the values of the parallel RLC circuit.

RLC series circuit
Frequencies:
 ●  Series resonant frequency:
\( f_s = \frac{1}{2\pi \sqrt{LC} } = \)?Hz
 ●  Parallel resonant frequency:
\( f_p = f_s\sqrt{1-\frac{R_l^2C}{L}} = \)?Hz
 ●  Maximum impedance frequency:
\( f_m = f_s\sqrt{1-\frac{R_l^2C}{4L}} = \)?Hz
Parallel network equivalent at the terminals for the series R-L branch:
 ●  \( X_L = 2\pi f_pL = \)?Ω

 ●  \( R_p = \frac{R_l^2+X_L^2}{R_l} = \)?Ω

 ●  \( X_{L_p} = \frac{R_l^2+X_L^2}{X_l} = \)?Ω
Impedances:
 ●  Total Impedance:
\( Z_{T_p} = R_s || R_p = \)?Ω
 ●  Maximum Impedance:
\( X_L(f_m) = 2\pi f_m L = \) ?Ω
\( X_C(f_m) = \frac{1}{2\pi f_m C} = \) ?Ω
\( Z_{T_m} = R_s || \sqrt{R_l^2+X_L(f_m)} || X_C(f_m) = \)?Ω
Coil Quality Factor:
\( Q_l = \frac{2\pi f_pL}{R_l} = \)?
Quality Factor:
\( Q_p = \frac{Z_{T_p}}{X_{L_p}} = \)?
Bandwidth:
\( BW = \frac{f_p}{Q_p} = \)?Hz
Half Power Corner Frequencies:
\( f_1 = f_p - \frac{BW}{2} = \)?Hz
\( f_2 = f_p + \frac{BW}{2} = \)?Hz