How to generate a Modified sin wave...?

Audioguru

Joined Dec 20, 2007
11,248
OK, if we will have sin wave then how will we switch mosfet in linear region??
The Mosfets in a pure sine-wave inverter are not linear amplifiers. Instead they switch on and off at a high frequency and use Pulse Width Modulation to produce the sine-wave that has the high frequency carrier filtered out.
Because the Mosfets switch on and off they do not get too hot.

The PWM can also provide voltage regulation of the sine-wave output.
 

Brownout

Joined Jan 10, 2012
2,390
If you want to start at a low level, then you'll probably want to start with the so-called "modified" sine wave inverters. Although they are simple, there are lots of ways to use them. I own a couple, and use them on occasion. Making a real sine wave inverter is a specialty, and absolutely requires lots of work, research and knowledge of many aspects of signal processing. It's not a project for an hobbists. Not tryint to discourage you, just want to prepare you for what's ahead.
 

Thread Starter

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
If you want to start at a low level, then you'll probably want to start with the so-called "modified" sine wave inverters. Although they are simple, there are lots of ways to use them.
can u tell me that methods?
 

Brownout

Joined Jan 10, 2012
2,390
Typically, the methods involve generating the waveform ( see post #16 for the waveform ) then using a transformer to step up the voltage. You need high current transistors to drive the primary on the step-up transformer. An alternate method is to use DC-DC converters to create the high voltage, and using high voltage transistors to switch the high voltage on the converter output, using the modified sine wave waveform to switch the output transistors.

Either way, you'll be working with lethal voltages. PLEASE TAKE ALL PRECAUTIONS! Learn how to work with high voltage before preceeding.
 

Audioguru

Joined Dec 20, 2007
11,248
If you want to start at a low level, then you'll probably want to start with the so-called "modified" sine wave inverters.
He already has my schematic of a modified sine-wave inverter as shown in post #18, but it is missing the PWM part that regulates the output voltage. The PWM part was developed later.
 

Thread Starter

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
An alternate method is to use DC-DC converters to create the high voltage, and using high voltage transistors to switch the high voltage on the converter output, using the modified sine wave waveform to switch the output transistors.
What the use and how to use DC to DC converter??
 
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