You can use this circuit to make a sine wave inverter. Instead of driving the fet's with the low frequency square waves , use a higher frequency(say 20khz) pwm signal. Apply a half cycle sine modulated PWM signal to each side of the bridge. One side at a time obviously :0) A small LC filter on the output of the transformer will give you a nice clean sine wave at 220V . I've used same setup to build a 2KVA sine wave inverter. works great. Mine works at 48VDC and uses more parallel fets , but the basic circuit. Not sure if the Arduino can do a fast enough pwm , but an STM32 board will handle it no problem!! FYI , the diodes in the circuit are not really needed. The fets have inverse parallel diodes in them anyway. Unless you are using schottky's , they won't be doing anything. Keep up the great videos!! Cheers Rob

10:48 "I calculated an efficiency of 84%" proceeds to write 83

-Can you make an inverter? -No -...

I love how you tell us the disadvantages of the circuits you build

Excellent tutorial! I remember watching AfroTechMods video a while back and it's good to hear you shout out to it!

Sent by ElectroBoom. I'm an old EE and hobbyist/troubleshooter. This is a great site. Wish this was around in the 70's and 80's! Subbed.

I have a 300W Sine wave inverter and its great. We get sporadic power outages here and with that thing i can power my fridge, charge my phone, power a light all from a old ebike battery (that i connected together for a massive ~12V 40 Ah. It gets charged by a 50W solar panel and is completely off grid. I used it 2 times and each time it was just brilliant to be the only person who had electricity. That smug feeling is worth it.

- "Can you pleeeease make an inverter? It would be the best thing in the world! Thank you!!!" - *NO.*

You are the one who knows this business best.

I would like to suggest that you include the shorting function, where you turn on both of the bottom fets during the dead-time of the inverter. This will greatly reduce transformer noise, make the transformer's output waveform look totally textbook - and improve the inverter's overall efficiency when driving purely inductive loads. Anyway, great video, as always :) .

Your common pcb soldering is amazing.Your soldering is better than a printed circuit board😍😍😍😍

So it is you who makes all the hand-drawn schematics in Wikipedia! Great Job!

Did I forget to thank you your work? I find particularly interesting, that you share also "how not to do", and your somewhat uncommon way to solder 😊 Your tutorials help me to distract from the all too perfect world of now.

i am only 10 years old and you teach me a lot Greatscott thank you for your effort have a nice day

Your almost at a million subs. Good luck GreatScott!

Thanks dear, only you're my real electronics teacher, i love your all videos truly.

Great Scott I'm watching your videos from last two years and learnt many things from you thanks for your videos n ,keep doing your job and again thank you so much

Congratulations for 900k subscribers...👏👏👏👏

Those circuit designers for pure sine wave inverter are brilliant

Perfect circuit to power up light bulbs.

I am your biggest fan and coincidentally I got the same project for my masters thesis I was just doing some research on this and you uploaded this video :)

Great video as always! You mentioned the pure sin inverter. Can you make a tutorial on how to create a low voltage sinwave from 12V?

always learn a lot from your videos

As you mentioned, turning on the bottom FETs during dead time will solve your spike problem. i have built exactly this type of inverter using a discrete transistor high/low side driver and NMOS FETs only. The efficiency is very good and the dead time conduction in the bottom transistors does not seem to impact eff. significantly. It powers all my home's lights plus TV and most small loads and never runs hot and has been super reliable.

I always look forward to your videos thank you so much !!!!

Good presentation.. I am doing now a high freqency inverter, this helped me lot..

"Invest into a proper one with a lot of safety features" Yeah... without any kind of proper reverse polarity protection :D #ElectroBOOM

Pure sine wave inverters do get tricky to build. Earlier this year I made a 10kw one using a small Atmel AVR micro, some IGBT blocks and a bloody great power transformer. Tracking modulation with load, while maintaining waveform integrity gets hard. I took a rising 1/4 of a sine wave cycle and sliced it into 120 areas. Each area was further sliced into 20 more slots that I could increase or decrease in duration. 1 slot = minimum drive, 19 slots=maximum drive. This quarter sine-wave was mirrored to synthesize the second quarter of the cycle . The combination was then flipped again for the second half of the cycle. A voltage feedback circuit drove one of 70 different drive intensity levels based upon output load conditions, to keep the 230V stable. This all happened on a small 8-bit micro with a 16 MHz crystal programmed in assembly language. But it was bloody hard work to get it right, but the output waveform was really clean. My recommendation: buy somebody else's inverter and watch tv instead.

I wish one day i could get entire knowledge on electronics just like you sir... as i am an electronics engineering student i have some hope on my wish...

Going to hit 1 Million sub...great going😜👍

Hey love your videos . I would absolutely love to see you modify the h bridge to ha dle more power .. make a charge pump as part of your circuit .. or simply add more h bridge driver circuitry to double up on the h bridge to handle more power . Keep up the good work and great content as always

Pretty darn good work, dude! Fantastic! 😃 But for the next one: good and expensive inverters, DIY or buy? 😂

Congrats on 900.000k Subs ^^

One of the great videos offered by you

Interesting, I was planning to do a similar job using an old transformer and an IGBT module given to me. Probably the biggest challenge (as shown) being to tame the switching spikes.I'll start by examining a few commercial designs & those presented in electronics magazines (Electronics Australia etc) for some ideas that worked for them.

I love your channel man! You should design an arbitrary waveform generator! Forget about the voltage conversion and explain the digital to analog conversation process.

Hey great Scott, you should build a diy air conditioner. It would be a fun project and be helpful in the summer. Thanks!

Thanks, Scott. I wanted to make my own low-frequency inverter.

Such a good video. Damn, you rock Scott!

That frankenstein AC wave lol. Good video.

Love the video Great scott.

Great video! I’ve made simple modified square inverter using PIC, N-channel MOSFETs, and transformer I got from audio amp. I reduced humming by connecting capacitor to secondary. This inverter outputs 120V but when I connect some loads to it, then voltage drops to about 60V. I’ll try to make a full bridge circuit.

Perfect! Now I'm *not* going to make such a Modified Square Wave Inverter! That's exactly what I did *not* want to make all the time.

Thinking about using this circuit to drive a flyback transformer for my new high voltage supply. It might not be great for mains AC but it's still a great little circuit :) thanks scott

Hi Scott! Nice video and schematic, as usual! :) Can you make a video on BMS circuits? I'm particularly interested in active load balancing (charge shuttling or inductive)... Keep up the good work!

Great videos.... Love from india...❤❤❤❤

Man, I fully understand people's frustration when it comes to building an inverter! When I first started Learning Power Electronics in college, I thought I could do that, and I thought, Geez, it's so easy! But time went by and it was only when I was writing my undergraduate thesis (I was trying to build a switched mode power supply ) that I learned things like: "dead time", , "Switching Losses "," Harmonics "," Types of Electrical Loads ".... Unfortunaly this is not as simple as it sounds! There are many things that can instantly blow up your switches, blow up your controller. To do this, you will need to study a lot of things before, of course, this if you want to do things right without risking your life. GreatScott, again It was a great video, and thank you for alert, and protect people from this risks.

Great vid as always!

Very informative Video. Hey, I was wondering if we could also use H-Bridges like L293d or l298 instead of using 4 mosfets?

Such a precise circuit.

I've been in this business for quite some time, and since I can use microprocessors, I generate the digital equivalent of a sine wave, which gives me a perfectly shaped curve and frequency stability. Depending on the microprocessor I use, I do not even need condensers and coils to flatten out some of the bumps. A sample rate of 4 kHz over 50 Hz (80 steps) appears prefect at the output.

Smart guy. You have a beautiful brain.

Awesome video thx for sharing your knowledge

Thanks, I love inverter or power electronics was hoping you would make a video on this area! 100% agree with your full bridge topology. But could you make another few videos and improve on the design. Part 2 - Adding output current and voltage feedback. Part 3 - Adding a low pass LC filter to make a pure sine inverter. Part 4 - Add input current / voltage feedback for use as MPPT tracking input (solar inverter). This would be my dream series of videos and you have the know how! Thumbs up if anyone else would enjoy.

Good video and information!

FYI I use PSIM to simulate power electronics it's great! Btw Great video.

Nice Try! Keep uploading such a High Quality content videos where you can learn a lot of things!

As always nice video!

Usually the mosfet switching part of the invertor switches allready high voltage DC which was been stepped up and rectified by a switching power supply. The same voltage could also be turned in to an ac signal with some PWM magic and a LC filter to average out the high frequency PWM in to a nice sinewave. Using the arduino's analog inputs and a few optocouplers a simple feedback loop can be established to monitor the quality of the output.

100k more for 1M! congrats in advance

I have made a pure sine wave inverter by making a step up power supply and using a class d amplifier with a 60 hz frequency generator... works perfectly...

Nice, thanks for sharing 😀👍

Thank you for this, you may have solved a problem I have with an inverter I picked up cheaply, I was trying to figure out what the programmable chip did, now I think I know, the chip is not functioning, and I have no means to program another, but if I can trace it's pin outs I might be able to replace it with an Arduino which I can program.

Add a snubber network, then you can suppress voltage surge while switching transition. Cheers from Indonesia

Awesome, well done!

Very informative. Btw any idea why the sound vanished after connected the load at output of transformer.

Am I the only one noticing a deep inhale breath before each sentence? I've noticed that in this video and now I can't unheard it.

I have been waiting for this video.

One of the problems with square waves is that they bring a ton of additional harmonic frequencies. Since harmonics are usually higher frequency, is it possible to round out the output using low-pass filters, or are the capacitor and inductor values to filter a cheap inverter too extreme? It’s my understanding that the good inverters use VERY high freq PWM with duty cycles corresponding to the sine function. The higher frequency of the PWM allows them to be cleanly filtered out. You might be able to achieve this kind of inverter with this same circuit but a new program.

I'm very new to electronics but I'm kinda interested in getting into power electronics. My idea might be completely wrong and maybe won't work, but what I'm thinking is you would have a high frequency PWM like a normal DC buck converter would have. But instead of aiming for a set voltage, you are using a timer to calculate what the voltage should be based on the frequency you are going for, and then reduce/increase the PWM based on that value. You then reset timer for each sine pulse. You of course need a H bridge to get the negative voltages, and a SMPS transformer to get proper isolation. In a typical setup your battery negative will be your ground, so you'd want a centre tapped transformer and make the centre the ground. You then aim for 170 volts peak on the negative and positive side and the output would be similar to a 120/240v system. Essentially this would give you a crude pure sine inverter, at least I'm thinking. I could be way off here. It sounds like it would work but I have not tried it or seen anyone try it so maybe there's a good reason for that haha. Am I on the right path or completely off? I've read up on different ways of doing it too but they felt more complex. Suppose there's a good reason though.

Nice video

Please make a video on DIY Battery management system, Cell monitoring system and cell balancing. It would be great project of the year and would be a stepping stone to your own electric vehicle.

finally ! an inverter video ! wo wo :D

how can you fix the voltage shape problem ?? any suggestions ? I was waiting this project hope you continue modifying it

Great way to show how an inverter works without giving people a reason to make one and then probably electrocute themselves

1:43, Dang what a savage rejection!!

Hi i like your vid and i hope you much more successful in the future

You should do a video on h bridge ac square wave and sine wave .on my inverter sine wave I get about 60 v on one side and about 110 on other side.also I get negative voltage on h bridge somehow of -60 and - 110 don't get it

You have nearly 1milion subs!

I love those Edison LED bulbs.

With a little more complicated programming, an LC filter and a circuit closely resembling this one you can create a full sine wave converter. I made one in uni

sehr schön erklärt.

The pull up resistors for the P-channel MOSFETs have to be between *gate and source* and not *gate and drain* , am I right? 🤔

Love your video

I have several MSW inverters with dead H bridges and I don't even bother fixing them. I just wire the DC out from the inverter directly to the plug. Most electronics these days have switching power supplies and they don't care. And it is a little more efficient.

Gracias, muy buen video

1:59 this is your longest "let's get started" in all your videos

I electrocuted myself with a home made inverter during my apprenticeship. Used 555 as the timer, and forgot all about what I was doing and after powering on for the first time with the step transformer in place, proceeded to touch the HV side. It was one of those deciding moments that re-affirmed my decision not to be an electrician and stick to instrumentation!

I did 3-phase pure sine inverter on my master thesis. It costs me and my friend over 1000 euros to design, build and run. And thousands of work hours... Kind regards!

There is also the issue with ripple current, which is hard on the capacitors in a lot of modern switchmode power supplies.

Nice video as before, can you send the link for obtaining the output stepup transformer

The gate resistor value in this type of inverter can be increased to limit the voltage spikes by slowing down the switching speed of the transistors. This does however increase the power dissipation in the transistors. To make this design put out real power you would have to add, Transistor heat sinks with more transistors in parallel, RC snubbers to keep the transistors in the safe operating area during turn off. Current limit and balancing on the transformer primary, output feedback regulation and short circuit protection. Not an easy project but if you are interested in power electronics then you will learn a lot with a project like this. Power electronics engineering is a high paying job if you can do it.

We will see you next time!

What about adding capacitor to perform low pass filter and make its resonate at 50 Hz?

Very cool. As the negative DC potential remains the same all the time I guess there's no need to apply any PWM to the low side mosfets but only the high side ones (in unipolar inverter)? This way a return path for currents always exist, also doing what you did in your workaround. It sounds reasonable?

Exciting video, but I have 3 questions about: 1.Can a pure sine wave inverter be used in an electric car? 2.Can the mosfets of an inverter circuit be oriented in a "X" pattern? 3.Would your DIY inverter schematic work in a electric car? (Adding safety features like all the commercial ones have of course)

Thank you!

I think making it a pure sine wave inverter using the sPWM library would be a fun exercise :)

Useful video

Could you add PWM to the mosfets to better simulate the sine wave?