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Pure Sine Wave Inverter Design

Started by syedzainnasir Pure Sine Wave Inverter Design
2 replies 248 views 2 participants
Latest activity · 24 Feb 2017

Pure Sine Wave Inverter Design

syedzainnasir PIC Microcontroller Projects Forum
#1
I am designing a pure sinewave inverter, 220V, 50 Hz.
Here is the complete design,
[img]http://i.imgur.com/QpX93md.png[/img]
without filter i simulate the whole circuit and tried to plot the current waveform by placing a current probe in RL Load (R = 5 Ohm, L = 16 mH).
I should be getting a sinusoidal current waveform but it is giving my arbitrary result. what might be the problem ?
I have followed this article for PWM generation using Atmega16.
Switching Frequency 16 Khz.
Fundamental Frequency 50 Hz.
http://tahmidmc.blogspot.com/2013/02...mode_2525.html
An external crystal is being used for 16 Mhz clock frequency.
here is the configuration i have done .
[img]http://i.imgur.com/JjK5UYJ.png[/img]

Here is the PWM waveform
[img]http://i.imgur.com/jPlB2it.png[/img]

[img]http://i.imgur.com/cXcdX7y.png[/img]



Instead of IR2110 i have used IR2112, as IR2110 is not available in Proteus. MOSFET Driver circuit is working fine, i have checked the voltage at gate and it is turning it ON/OFF.
MOSFETS are working good.

If i directly filter the PWM signal using RC filter i am getting a sinusoidal voltage waveform.

What might be the problem that i am not getting sinusoidal current waveform ????
If someone interested in debugging my circuit or just wants to run it in their Proteus please tell i will attach the design file.

Here is what i am getting when simulate the circuit
Current waveform
[img]http://i.imgur.com/XbKkVQz.png[/img]

Voltage Waveform
[img]http://i.imgur.com/rp0XPZp.png[/img]

Any help will be appreciated

I wish tahmid is here to help me out, he is the best guy when it comes to share knowledge and helping out.[img][/img]

Community replies 2

Re: Pure Sine Wave Inverter Design

#2
[quote=Watters post_id=152 time=1487943692 user_id=78] I am designing a pure sinewave inverter, 220V, 50 Hz.
Here is the complete design,
[img]http://i.imgur.com/QpX93md.png[/img]
without filter i simulate the whole circuit and tried to plot the current waveform by placing a current probe in RL Load (R = 5 Ohm, L = 16 mH).
I should be getting a sinusoidal current waveform but it is giving my arbitrary result. what might be the problem ?
I have followed this article for PWM generation using Atmega16.
Switching Frequency 16 Khz.
Fundamental Frequency 50 Hz.
http://tahmidmc.blogspot.com/2013/02...mode_2525.html
An external crystal is being used for 16 Mhz clock frequency.
here is the configuration i have done .
[img]http://i.imgur.com/JjK5UYJ.png[/img]

Here is the PWM waveform
[img]http://i.imgur.com/jPlB2it.png[/img]

[img]http://i.imgur.com/cXcdX7y.png[/img]



Instead of IR2110 i have used IR2112, as IR2110 is not available in Proteus. MOSFET Driver circuit is working fine, i have checked the voltage at gate and it is turning it ON/OFF.
MOSFETS are working good.

If i directly filter the PWM signal using RC filter i am getting a sinusoidal voltage waveform.

What might be the problem that i am not getting sinusoidal current waveform ????
If someone interested in debugging my circuit or just wants to run it in their Proteus please tell i will attach the design file.

Here is what i am getting when simulate the circuit
Current waveform
[img]http://i.imgur.com/XbKkVQz.png[/img]

Voltage Waveform
[img]http://i.imgur.com/rp0XPZp.png[/img]

Any help will be appreciated

I wish tahmid is here to help me out, he is the best guy when it comes to share knowledge and helping out.[img][/img] [/quote] I have experimented (in simulations) with different smoothing (filtering, snubber) networks. I have found it requires adding a capacitor. To be effective, two LC networks may be necessary.

[img]http://obrazki.elektroda.pl/8964996300_1401900332_thumb.jpg[/img]

I used a slow frequency (1.5kHz), to make the waveforms obvious. The capacitors are a larger value and they must carry heavy current pulses (in theory).
Your configuration is at a faster frequency, and it will use different values, and it may put less stress on the filter network.
Recommended Tutorial: [url=http://www.theengineeringprojects.com/2015/07/pure-sine-wave-inverter-simulation-proteus.html]Pure Sine Wave Inverter Simulation in Proteus[/url]

Re: Pure Sine Wave Inverter Design

#3
Some people seem to be of the opinion that a pure sine wave inverter is somehow better for charging laptop batteries than non-sine wave inverters. That seems wrong to me; I can't imagine why the THD of AC going into a digital power supply that puts out low voltage DC to charge a battery matters to the laptop that is running from the battery. Am I missing something? Thanks and [url=https://inverterreview.com/]check this[/url]
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