In this post I have explained a simple 48V inverter circuit which may be rated at as high as 2 KVA. The entire design is configured around a single IC 4047 and a few power transistors.
Technical Specifications
I am a big fan of u....i am a wisp. i need an inverter design with 48volt DC input and 230volt output supply and output power in the range up to 500w.
This inverter will be running 24*7*365 days continuously and should not have charging facility. will u please design the circuit and transformer running on 48v.
Thanks & Regards
Circuit Diagram
Circuit Description
Referring to the shown 48V inverter circuit, the IC 4047 forms the main oscillator stage responsible of producing a totem pole outputs for the connected output stage.
The output stage is made by configuring a 4 individual high gain high power transistors modules, two of them on each channel of the push pull output stage.
The TIP122 are themselves internally configured as Darlingtons which are further attached with TIP35 transistor in the Darlington for generating exceptionally powerful current gain across each of the modules.
Setting up the Oscillator Frequency
C1 and R1 must be appropriately set for achieving the desired frequency as per the required specifications...could be 50 Hz or 60 Hz.
The shown 48 V inverter configuration is designed to generate a massive 2 kva of output power provided the devices are mounted on sufficiently large heatsinks and the battery rated at 48 V, 100 AH, also the transformer rated at 36-0-36V, 1 kva
For lower outputs, one of the modules could be eliminated from each of the channels.
The BJT BC546 is positioned to provide a reasonably fixed 9 V to the IC in order to keep the IC safe from the high battery voltage and within its specified working voltage limit.
Using Zener Diode to Drop Regulate the IC supply Voltage
In the above explained 48V inverter circuit I have used a BC546 emitter-follower series pass circuit to step down the 48V DC to 9V DC for supplying the IC 4047.
However, if the BC546 transistor is not available, we can incorporate a zener/resistor based regulator for achieving the same results, as shown in the following diagram:
Questions & Answers
Hello Sir!! I am a 4th year B.Tech Student Electrical Eng.
We are trying to make pure wave sine wave inverter using PWM and bubba oscilator 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.
thnk u!
Hello Ritwik please specify the following:
battery voltage?
inverter wattage?
battery voltage would be around 24 V
Wattage 500W
Is this inverter specification alright fr thr project demonstration??
or should go with a smaller wattage say 100W
Inverters can be made right from 10 watts to 100000 watts regardless of their types,
watts and volts are not specific to inverter designs….so 24V 500 watt is just one of the ranges and can be incorporated for your application.
100 watt would be better since it would require smaller parts.
I'll try to post it soon…keep in touch.
hello sir …
CS9012 Transistor is same BC 557 (PNP).and CS9013 Transistor is same BC547????????
(9012 = 557)
(9013 = 547)
9012/9013 = 500mA, 30V
BC547/557 = 100mA, 45V
Ok sir 100W inverter would do then…
thnk u
Please try to post soon 🙂
OK!
Dear Sir,
Please upload a very very simple inverter circuit by which I can run a 100 W A.C fan only.
It's input should be 12 V.
Thanks in advance.
Regards.
Rashid R. Ansari
Dear Rashid, you can try the following circuit
https://www.homemade-circuits.com/2012/02/how-to-make-simplest-inverter-circuit.html
Sir..
I am unable to find those transistors (9012,9013) . So
can i use 547, 557.
((This is the curcuit of firealarm using electronic buzzer alarm .))
you can try 2N2222, 2N2907 instead
BC547/557 are 100 mA rated, not sure whether it'll work for your application or not.
Can i use a 12v input
yes, can be used
ok all I would have to do is apply 12v, nothing wouldnt have to be changed other than adding a 12-0-12 transformer
that's right….the BC546 will not be required with a 12V battery as the supply
ok all I would have to do is apply 12v, nothing wouldnt have to be changed other than adding a 12-0-12 transformer
can I use something else instead of the 20amp diodes could I use resistors if so what values could I use, only 3amp diodes are available where I am.
20amp diodes would be necessary if the trafo is also rated at 20+ amps…for smaller trafos the diode ratings may be appropriately lowered
…resistors cannot be used instead of diodes for freewheeling application
Just asking something that I was in a discussion with a friend about, he says negative and positive voltage in relative is actually the samething it's just the direction of flow that makes the difference, would you say that's true? If not could you explain what the actual difference is.
yes that's correct…
So what if I have a DC fan that uses a positive 12 volt but I have a source that is negative 12v could I apply the 12volts to a regulator and connect the fan to the out put and get it to work?
If yes then I would assume that I have to use a positive voltage regulator to do so and if that's the case why wouldn't I get the same results if I used a negative voltage regulator since I would be directing the flow of current by using the regulator.
if you have a -12V supply, you would also have the other wire as the +12V….use this other wire as the (+) for the motor…
What's the value for the pot and and the c to get 50hz and ho do you calculate it
you can try a 22k pot
value of c
1uF/25V
If its electrolytic would that be a problem because I am wondering if thats the problem on my 4047 inverter…. I can only get that value as polarized so dont know which way to turn it.
you can use two nonpolar 0.47uF capacitors in parallel, or simply first try with a single 0.47uF for getting the required 50Hz frequency
ok then will build this tomorrow and I will use 12v, I wont use the bc546 do I need the 10k 1/2 watt resistor?
the 10k resistor, zener and the BC546 can be eliminated if a 12V supply is used.
ok i just built it I could only find code 473 resistor and I used some tip3055 along with 3 tip106 and 1 tip105 and I only had a 50k pot I used 1 amp diodes accross the transistors and used a half amp transformer at 12v just to test but I got no output.
check if the output is oscillating or not, and also check your battery current and voltage.
I am getting 5 amps on the positive leg of the battery and 2amps on the negative leg, 0v ac from transformer, battery voltage wen circuit is attached is 12.30v and detached it is 12.67v, I got 33khz from transformer, transistors seems normally warm nothing too much but the transformer get hot i think because of high frequency.
I got 5v across the output pins 10&11 of ic 4047
also I am getting 10v dc between center top and each end of the input of the transformer.
make the frequency 50Hz and then check…
and different current readings on +/- poles of the battery is not possible, how did you check it?
also without any load the amp reading should be very small, in milliAmps
i used a clamp meter to check amp readings, and which capacitor can I use to get 50hz
put an ammeter in series with the positive line to get a physical reading of the consumption
would a 0.02mf get 50hz
verify it with a frequency meter or refer t the formulas presented in this article:
https://www.homemade-circuits.com/2013/09/ic-4047-datasheet-pinouts-application.html
C will be in Farads
I dont know what that means :1/8.8RC at pin10 and 11 which would be the way to work out the frequency at 50hz.
use a frequency meter then…
I have a multimeter thats all, I just wanted to know which capacitor to use, I tried a code 104 on a basic setup of a 4047 inverter and I adjusted the 50k preset I used and I got it to 100hz, I just need 50hz
how do you know it's 100Hz?
try two 104 in parallel
my multimeter can do frequency test, i just put both probs onto the output of the transformer and adjust pot and thats the lowest it went, about 119hz
if you had a frequency measuring facility then why were you not using it so far?
anyway increase the capacitor and check again… these are so basic stuffs…
Each time I made a test I told you the frequency so why would you assume I didnt have a device to test even after I told you that I had one….. there are alot of capacitors, it would take very long to go through all just to get one frequency I am not a pro…. anyway I got the 50hz, thanks anyway.
I used irfz44n I didnt use any driver transistors and then power transistors I used 100ohm resistors to feed the gates to increase power I can just bridge from those same 100ohm resistors to gates of additional fets or should I add more 100ohm resistors?
If you have a proper frequency meter then it's just a matter of adjusting the relevant preset or capacitor and measuring the results, that doesn't require to be a pro.
yes your fet connections are OK. you must add separate resistors for each parallel fet.
Good Evening Engr. Swagatam! ^_^
Can you describe the uses briefly? :
1. 4 x 10k resistor
2. 4 x diodes (except zener)
tnx for the info…I need it for our interview…in which I chose this type of circuit…
Eshkariel, the 4 resistors are for biasing the respective transistors so that they can conduct and induce the oscillating current in the trafo.
the diodes are for safeguarding the transistors from the reverse EMFs from the trafo winding during their OFF periods