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Pure Sine Wave Inverter (300 W) using SPWM

Approx. component budget: Rs. 9,000 - 15,000

Objective

Build an inverter and measure its output waveform quality, efficiency and voltage regulation at different loads.

What you will build

A 12 V to 230 V inverter with an H-bridge of MOSFETs, a microcontroller generating SPWM, a gate-driver stage, a step-up transformer and an LC output filter.

Results you can expect

• Output waveform and THD
• Efficiency vs load
• Voltage regulation
• Comparison with a modified-sine inverter
• Temperature rise of switches

What you will learn

Switching converters, PWM, filter design and transformer use, the basics of UPS and solar inverter design.

Tools and notes

Oscilloscope (college lab), Arduino/STM32, MOSFET driver ICs, Excel. Works with mains-level voltage on the output, so use insulated enclosures, an isolating transformer for testing and a fuse on the battery.

Resume points from this project

• Built and tested Pure Sine Wave Inverter (300 W) using SPWM; objective: build an inverter and measure its output waveform quality, efficiency and voltage regulation at different loads.
• Measured and analysed output waveform and THD and efficiency vs load; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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