Indian Institute of Technology Tirupati
Course No: EE206P
Name of the Lab: Analog circuits Laboratory
Academic Year/Semester: 2025/B.Tech 4th Sem
Assignment Number: 01
VOLTAGE DOUBLER
Divyenth Ananth
Roll Number EE23B061
Instructor:
Vijay Kumar Gurugubelli
Voltage Doubler
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Objective
Design, simulate, and analyze a half-wave voltage doubler circuit and verify its output characteristics using a sinusoidal input signal.
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Circuit Description
The circuit consists of:
• AC Source (VG1): Provides a sinusoidal input voltage.
• Diodes (D1, D2 - 1N4007): Used for rectification and voltage doubling.
• Capacitors (C1 = 100µF, C2 = 22µF): Store and transfer charge for voltage multiplication.
• Resistor (R1 = 1M): Provides a discharge path for the capacitor to stabilize the output
voltage.
2.1
Working Principle
• During the negative half-cycle, D1 conducts, charging C1 to the peak input voltage (V p ).
• During the positive half-cycle, D1 turns off, D2 conducts, and C2 charges to around 2V p .
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• The final output is a pulsating DC voltage approximately 2V p − 2Vdiode .
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Simulation Parameters
• Input Voltage: Vin = 20V p−p (i.e., V p = 10V)
• Expected Output Voltage: 2V p − 2Vdiode ≈ 18.6V
4
Observations and Results
• The output waveform shows a doubled DC voltage with some ripple due to capacitor discharge.
• The measured output voltage in simulation matches the theoretical value ( 18.6V).
• Increasing C2 can reduce ripple for a more stable DC output.
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Conclusion
The half-wave voltage doubler was successfully simulated and analyzed. The output voltage
closely follows theoretical predictions, confirming the effectiveness of the circuit to double the
peak input voltage.
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