# BUBBA OSCILLATOR CIRCUIT PDF

In this post we learn how to make a simple sine wave inverter using bubba oscillator sine wave generator. The idea ws requested by Mr. Ritwik Naudiyal. We are trying to make pure wave sine wave inverter using PWM and bubba oscillator for our Final project, also along with it a battery charging and auto cut off circuit would be needed. We want the inverter to work for day to day purposes. We would be grateful to you if u can give a working circuit fr this.

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In this post we learn how to make a simple sine wave inverter using bubba oscillator sine wave generator. The idea ws requested by Mr. Ritwik Naudiyal. We are trying to make pure wave sine wave inverter using PWM and bubba oscillator for our Final project, also along with it a battery charging and auto cut off circuit would be needed.

We want the inverter to work for day to day purposes. We would be grateful to you if u can give a working circuit fr this. The proposed sine wave inverter using bubba oscillator may be understood with the help of the following points:.

The sine wave modulation input at pin5 of IC2 is ahieved with the help of a bubba oscillator created by using four opamps from the IC LM The generated sine wave pulses are fixed at precise 50 Hz and fed to pin5 of IC2 via a BJT common collector for further processing. The 50 Hz for the bubba oscillator is set by selecting R precisely with the help of the following formula:. IC2 compares the sine wave modulations at its pin5 with the square pulses at its pin2 and generates an equivalent PWM waveform at its pin3.

The flip flop stage reqired for switching the power stage is configured through a single IC whose outputs are appropriately integarted with the two high gain high current power BJT stage formed by Darlington TIP and TIP The pin14 of the is clocked at around Hz via pin3 of IC1 in order to achieve a 50 HZ switching across the power transistors.

If you have any circuit related query, you may interact through comments, I'll be most happy to help! Your email:. Thanks sir, Can I build a watts inverter with this circuit?

Can I use 24v battery input for such power? Hi foxy, you can definitely do it by appropriately upgrading the mosfet and the transformer specs. Hi I have tried to simulate the circuit as it is, on proteus, but I am not getting any output from the bubba oscillator and hence none from th tx.

I have tried to attach the circuit on email but I am not sure if it will be received. It will depend on the transformer wattage rating, and battery Ah rating. Mosfets can be replaced as per these maximum wattage ratings. Thank you. I really appreciate that you actually respond to all of the questions and your circuits are very useful for my project. Hola Swagatam estoy intentando por todos lado hacer esta montaje oscilador bubba pero no funciona los Ic1 y Ic2 que pulso deben tener y he cambiado las R y los C del IC4 pero nada por favor puede usted ayudarme si hay otro circuito o como mejoro este diagrama Gracias.

Hola Victor, could you please translate your comment in English so that we can all understand it? So i was wondering what the problem could be but I understand that you didnt design it I just like to try new circuits and was just seeking advice on fixing that problem. I realize why you didn't understand fully what I was saying, I sent this link to you but seems It didn't go through at the beginning of the messages.

But while the Pwm is disconnected from the Fets if I connect the transformer there is no frequency at the drain of the transistors nor at the secondary of the transformer, also no voltage across the drains which would go to the secondary of the transformer. If I connect the transformer and also reconnect the Pwm feeds then the frequency goes up to 2. It will be difficult for me to comment on the linked circuit since it's not designed by me and it's based on Microcontroller.

By the way I cannot see any PWM feed from the IC, it's just the alternate square wave outputs which are been fed to the half bridge drivers. One other thing, I don't have any 10ohms resistors so I used ohms for the gate of the fets could that be what's causing the high frequency. I am assuming that you have built the circuit discussed in the above "bubba sine wave" article.

But while the Pwm is disconnected from the Fets if I connect the transformer there is no frequency at the drain of the transistors nor at the secondary of the transformer. Also the more I change the time division on the scope it's either the frequency doesn't show or it changes in value so that's why I used my multimeter to test frequency.

A similar circuit was verified for its waveform by one of the readers, where he could capture the details across the output of the trafo, you can see the images in this article…. I'll provide a drop box link to the set up I have and the readings, also the scope is connected to the primary of the transformer because I don't think it can handle v. I actually built the circuit in the link I provided above and from the arduino I got 50hz but from the transformers output I got 2khz, I am wondering what would cause that I used the correct value capacitors, 2 diodes are there that has no value so I used 1n I was thinking about building a low pass filter to get 50hz which I would just use a ohm resistor and a 10uf capacitor but I was seeking your advice to identify the problem causing that high frequency.

It's causing due to the superimposition of the PWM frequency over the 50Hz pulses, please check through an oscilloscope for understanding the exact situation of the output….

Also I know the circuit needs to be programmed I have the code for it also, I ordered the driver chips so when they arrive I'm going to build it and test it out with 4 irfz44n, if that works I'll try 8.

I think a single equivalent diode across any one of the parallel mosfets would do the job, moreover diodes are not designed to work in parallel due to their unequal forward voltage specs. Angelous, you can just specify 20 amp rating to the dealer, he will provide you the right one…. Angelous, you'll have to solve it yourself, because I hardly find time to answer the comments…. Angelous, always multiply the trafo winding voltage rating with its current rating…. The transformer will accept and produce power only within its rated value, it will not accept anything above this regardless of how much the battery or the mosfet are pushing….

I'm trying to gain an understanding of how this circuit works so I can develop a test plan for it once I build it. How can I configure the IC to generate a 60 Hz switching for the power transistors? Also, I'm a little confused how the sine wave from the bubba oscillator makes it's way to the transformer.

I understand that the switches between the transistors, and the oscillator creates a sine wave, but the in-between steps are a little confusing to me still. Slow sine waves are achieved through the Bubba circuit and fed to pin 5 of IC2 via the BC emitter follower.

The preset associated with IC1 could be adjusted to achieve this frequency…the value 4 is found by counting the number of sequencing pinouts of the IC If you are having difficulty with the design, you can go through the following article for a comprehensive learning regarding the concept.

This is very helpful for my senior project, so thank you! You explained it in simple terms that are easy to understand, and I appreciate that. My question is: How much power can this circuit provide safely? No higher power resistors or other components would be required? One last question. However in this design, TIPs are positioned only for handling the base current of TIP35 and have no direct connection with the load, so no issues, everything is correctly configured….

I've tried the RC-filtered output generates sine wive. Thanks for sharing the circuit to us. Does IC control DC voltage for the generator circuit? This sine wave inverter, does it mean pure sine wave inverter, as per waveform diagram above? Thank a lot for explanation. Good day, since the can tolerate only upto 35V, this voltage cannot be exceeded, however if an alternative method of stabilizing the voltage to the ICs is employed such as a common collector transistor stage, then probably upto 80V can be used in this circuit.

What is the use of the last stage in the in the circuit,which uses the TIPs and the diodes in parallel? What is the specification of the tranformer? Is the value of R 3. Hello sir, thanx a lot for giving us the circuit for inverter. I tried to simulate the circuit. I am not able to figure out how the value of R and C has been decided for frequency 50hz. As 50hz is not coming for 22k and 10n according to the formula mentioned in the aforesaid comments! Please explain it a bit sir, we have an evaluation for this circuit.

We have our evaluation on 20th. We need the stage wise functioning of the Sine-wave inverter using bubba-oscillator. Functioning of each circuit used like , reasons of using this IC,why the connection has been made?? Your email address will not be published. Notify me via e-mail if anyone answers my comment. Previous: Simple 48V Inverter Circuit. You'll also like: 1. Comments Thanks sir, Can I build a watts inverter with this circuit?

Hi what is the output power and current for this? What kind of loads can it drive? Load can be any type of load. I got 51hz without PWM feeds to gates of Fets But while the Pwm is disconnected from the Fets if I connect the transformer there is no frequency at the drain of the transistors nor at the secondary of the transformer, also no voltage across the drains which would go to the secondary of the transformer.

I am having difficulty in understanding your waveform results…. I know you have H bridge with N channel fets but I thought it was a mixture of N and P… Also I know the circuit needs to be programmed I have the code for it also, I ordered the driver chips so when they arrive I'm going to build it and test it out with 4 irfz44n, if that works I'll try 8.

Ok thanks, and the anode goes to the source and the cathode goes to the drain. Angelous, all sine wave oscillators are good…but bubba is more balanced and stable. I would be grateful for your response. Hi Again, I'm trying to gain an understanding of how this circuit works so I can develop a test plan for it once I build it. Thank you!

Thank you!! Down by ic4 there are 4 resistors without value, should they be 22k for 50hz? Good day, Thanks for sharing the circuit to us. Hello Ritwik, If possible I'll try to update it…in my free time.

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## Sine Wave Inverter using Bubba Oscillator Circuit

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. The problem is that i am not able to generate the sinusoidal from the circuit. This below is my circuit :. And this below is my result Simulated for 10sec :. Zoomed result Simulated for 10sec :.

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