Concept : To demonstrate the working of a Bridge Rectifier and a RC Filter

Explanation:

A diode bridge rectifier with a filter is a common circuit used to convert alternating current (AC) to direct current (DC) with reduced ripple. Here’s a brief overview of how it works:

Components:

• Diodes: Four diodes arranged in a bridge configuration.
• Transformer: Often used to step down the AC voltage.
• Filter Capacitor: Used to smooth out the DC output.
• Load Resistor: Connected to the output to utilize the DC power.

Working Principle:

Rectification:

• During the positive half-cycle of the AC input, two diodes (D1 and D2) conduct, allowing current to pass through the load resistor in one direction.
• During the negative half-cycle, the other two diodes (D3 and D4) conduct, again allowing current to pass through the load resistor in the same direction.
• This results in a pulsating DC output.

Filtering:

• The filter capacitor is connected across the load resistor.
• It charges during the peaks of the pulsating DC and discharges when the voltage drops, thereby smoothing the output and reducing the ripple.

Simulation Mode: Transient

Simulation Parameters: .tran 0.001 0.5 0 UIC

 

Simulation Type	Start Time(sec)	Stop Time(sec)	Step Time(sec)
.tran	0	0.5	0.001

 

Reference Netlist:

* Diode Bridge Rectifier with Filter

 

.model mydiode D

.model mydiode D

.model mydiode D

.model mydiode D

 

D1 0 COM.1 mydiode 

D2 COM.1 COM.2 mydiode 

D3 0 COM.3 mydiode 

D4 COM.3 COM.2 mydiode 

R1 COM.2 0 1k 

V1 COM.1 COM.3 SIN(0 240 50 0.0 0.0 0.0 ) 

C5 COM.2 0 1m 

 

.tran 0.001 0.5 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.

 

Supply Details:

Input=COM.1 and Output=COM.2

Reference Output:

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

 

 

Conclusion:

The output of the bridge rectifier is filtered as shown in the output giving out an almost DC signal with ripples.

 

Assignment:

Add a zener regulator at the end of the above circuit and get a regulated output. Note: A zener diode spice model file may be required.

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