Exp 4. Parallel RLC Resonance

Concept : To demonstrate the Parallel RLC Resonance

 

Explanation:

Parallel RLC resonance refers to a condition in a parallel RLC circuit where the reactive effects of the inductor (L) and capacitor (C) cancel each other out, resulting in a purely resistive impedance at a particular frequency known as the resonant frequency. At this resonant frequency, the circuit can achieve maximum or minimum impedance, leading to unique behavior in current and voltage. A parallel RLC circuit consists of a resistor (R), inductor (L), and capacitor (C) connected in parallel across a voltage source.

In a parallel RLC circuit, resonance occurs when the inductive reactance XL and the capacitive reactance XC are equal in magnitude but opposite in phase. This causes the reactive components to cancel out, resulting in a purely resistive impedance.

 

Simulation Mode: Transient

Simulation Parameters: .tran 0.01 100 0 UIC

Note: Please check the Use Initial Conditions

Simulation Type

Start Time(sec)

Stop Time(sec)

Step Time(sec)

.tran

0

100

0.01

 

Reference Netlist:

* Parallel RLC Resonance

 

R1 0 COM.1 1 

C1 0 COM.1 1 

L2 COM.1 0 1 

V1 COM.1 0 SIN(0 240 0.1 0.0 0.0 0.0 ) 

 

.tran 0.01 100 0 UIC

 

.control 

run 

plot all 

.endc 

.end

 

Reference Circuit Schematic:

Make the circuit diagram with the exact pin-to-pin connection as shown below to practice. This will help you to complete the experiment successfully.

 

Reference Output:

After the simulation is done, the following output graph appears at the screen showing the voltages and currents across all the nodes.

 

At Resonance  Frequency:

 

At frequencies other than the Resonance Frequency:

 

Conclusion:

Thus, the behaviour of a parallel resonance RLC circuit has been seen at the resonance frequency and the other frequencies. In this way the RLC circuit can be used in tuning radio receivers.

 

Assignment:

Change the components, sources and analysis values and get different results. Please verify the theoretical and practical results.

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