How to design a pure sine wave inverter?

To design a pure sine wave inverter from the scratch, we require the following circuit stages: A basic 50 Hz or 60 Hz inverter circuit. An op amp comparator using IC 741 or by configuring IC 555. Two sets of triangle waveform, one slow (low frequency) and the other fast (high frequency).

What is a sine wave inverter?

A sine wave inverter is a device which converts battery power into a 220 V AC or a 120 V AC sine wave output. There are 3 basic types of inverters: square wave inverter, modified sine wave inverter and a pure sine wave inverter. The voltage waveform output from a square wave inverter is square wave.

What components are required for a pure sine wave inverter?

Here’s the list of primary components required: EGS002 Pure Sine Wave Inverter Module – The brain of the inverter. MOSFETs (4–6 units): IRF3205 or IRFZ44N MOSFETs for switching. Transformer: A UPS-style 12–0–12V or 24–0–24V (based on your input voltage). Filter Capacitors: 4700µF, 100µF, and 10µF for smoothing and filtering.

How does a pure sine inverter work?

A pure sine inverter works by inducing an alternating sine waveform pattern across the primary transformer winding with a selected frequency rate. This frequency rate can be 50 Hz or 60 Hz, depending on the country and region specifications. This sine waveform is in the form of sine PWM which is a digital signal and not a linear signal.

How to refine SPWM waveform at the output of an inverter?

In order to refine this SPWM waveform at the output of the inverter we simply add a 3 uF / 400V capacitor across the AC output wires of the transformer which smoothens the SPWM edges to reproduce almost a clean pure sine waveform output.

How do you use a SPWM in an inverter power MOSFET?

The basic idea is to derive two triangle waves, one fast (high frequency) and the other slow triangle wave (low frequency), compare them to produce SPWM, then switch the inverter power MOSFETs with this SPWM frequency.