There's pretty easy to make square wave inverter circuit in the internet. But to run most load like fan, TV, etc you need to have a sine wave inverter.
Making sinewave or near-sinewave inverter is more complex and costly. But we can also convert square wave inverters to sinewave inverters.
A LRC resonant circuit is needed for this. The values determine the output frequency and waveform.
For a 50Hz 150V square wave output to become 230V 50Hz sine-wave, you need the above circuit connected to the output of the inverter.
Parts list:
- 100mH (0.1H) inductor, make sure you get high amperes rating ones.
- 27Ohm resistor, get atleast 50Watts resistor for a 250Watts inverter.
- 100uF nopolar capacitor. Get 450V ones.
Assemble the whole kit like the diagram above and connect the output of the inverter to the input of this circuit.
hello sir,
your site is very useful to us. i want to generate pwm by comparing triangular wave and sine wave. I have tried to generate triangular wave by using IC 741 & LF347. but i couldn't get the output. Is there any other IC to generate triangular wave. Please help me
Try a 555 timer chip
Now a question for you my friend can I use a LM385 chip to get a sine wave?
how to find out the value of inductror??
Actually i wants to convert square waves with amplitude 300V dc in to ac, so any buddy suggest me the value of inductor.
Thank for your circuit, please can you send the design calculation to me?
Hi i m mukesh i need to convert a 3.91 khz square wave to 50 hzsine wave,can u suggest a method
Hi - I have 1400 VA square wave inverter purchased recently, less a months. However, I wanted to buy a SINE WAVE but some have I missed it. How can i change it to SINE WAVE now. Please help and how to identify the driver and is it simple to replace just like that without modifying the existing circuit? Please advice. Give me the circuit. thanks
Hi Sir - i wanted to convert my 1400 watt square wave to sine wave. please advice.
Hi - help me to convert my 1400 watt square wave to sine wave.
thanks
this circuit is very very good.tank you
How can I convert squarewave out put of fly back micro inverter into sine waveform?
Hi Gayathri,
Outputs of any flyback based converter is very unpredictable, output voltage varies a lot under different loads. And it's not truly square wave, rather a series of pulses.
This circuit described above won't be effective. Change the driver circuit, and use H bridge MOSFET power section, the only option you have, according to my knowledge.
How can i turn a 12v dc to 220v ac square wave inverter to a pure wave inverter
USe a different driver board, like this one, https://www.circuitsdiy.com/500-watt-low-cost-pwm-inverter-circuit/
how can i make a 50hz 12v to 220 using an lm324 amplifier??
can we convert square waves into sine waves using digital signal processing? if possible then how?
pls sir the circuit is not clear to me. am i to connect to the output of my inverter. pls here is my email strongtowerelectronics@gmail.com please send me an email. thank you
Hi, this is what im looking for, will this work on my inverter that has a 220ac and 1500w power output?
Should I connect the output ac to the ‘in’ and one end in the ‘gnd’ then new output will be ‘out’ then one end at the ‘gnd’, please help me. Thanks!
i thinks using a suitable transformer 220 input 220 output can make a deference
i use it but there is quit heat on the transformer .