The output circuit of 200 watts home power inverter.

A previous article(An oscillator of the 200 watts power inverter) I say about the frequency generator circuit of the our 200 watts home inverter. The next we see part of output as well.

As show figure below When IC2-SG3526 can generate the square wave frequency of 50Hz output at pin 13 and pin 16. Both signal that has Phase difference is 180 degrees will send to R13 and R15, to bias pin gate of both transistors Q1 and Q2 number IRFP054. Which are mosfet type N channel, that has diode damper Diode is within, makes both of transistors alternately conduct current. If any one has a bias. signal at gate pin as high will can conduct current(ON). But if it get signal as low will stop conduct current(OFF).


The conduct currents of the two transistors. Cause current to flow in primary coil of transformer T1 into drain out to the source pin of Q1 and Q2, and to fully circuit at ground by pass to R8 value 0.01 ohm. Which is resistor monitoring the amount of current in the output circuit, which is discussed next.

The working of Q1 and Q2 are characterized the switches. The spike voltage will cause the occurs at pin drain of both transistors. Which occurs incunabulum It is changing state from ON to OFF. This spike voltage is the voltage is very high. May be higher than the supply voltage, many times. Which is extremely dangerous to the power output transistors. Therefore, it is necessary to eliminate this spike voltage out. The circuit that performs this function is called a snubber circuit.

The snubber of this circuit consists of D4, D5(BY299), D6, R14, C9 and C10. For D5 and D6 are diode works faster or called Fast Revovery Diode number BY299.

Under normal conditions, D5 and D6 will do not conduct current. Which it will conduct current when voltage at pin drain of Q1 or Q2 rise. Until have value greater power supply (+12 volts), The current will flowing through the both diode into charge to C9 and C10, and if voltage at pin drain of Q1(IRFP054) and Q2(IRFP054) have higher 18 volts, will makes the zener diode D4. Which have value 18 volts conduct current through the R14 of 18 ohm.

Which operation of all the equipment as a result to lower the spike voltage.
Likely that both power transistors will be damaged less.
This article is part of 200 watts home power inverter project using SG3526N You can read each section for continuity.

  1. Simple working principle of the inverters
  2. Operation of 200 watt inverter diagram
  3. An oscillator of the 200 watts power inverter
  4. The output circuit of 200 watts home power inverter.
  5. 200 watts home power inverter project using SG3526N
  6. How to build the 200 watts home inverter projects

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hi tank for this post
what is the part number of IC1?


hi,tank for website
what is the part number of t1?

mohanraj soni

Very nice to make familiar with DC-AC Invertor, but request in interest hobbyiest if you mention the Capacitor/Voltage, Resistors used with of wattage safe to use/he be safe. Heat-sink also may be shown/append as, where and when used in circuite Thank you for the cause of common men interested to enter in this field/hobbyiest


hi, please how those IC1B activates the reset pin 5 of IC2 considering that the signal diode 1N4148 is reversed biased?


you are using step down trans former only using step up tranformer


hi admin,
Thanks for this post
What is the value of Resistor between c2 ,c3 and pin6 in IC1 B

bankole michael fem

What is the part number of IC1A and IC1B


what is the value of the resistance between IC1A, IC1B ??????


what is the value of the resistance between IC1A ,IC1B?????


what is the value of R7 ?? the resistance between IC1A , IC1B??


between ici 1 and ici 2 their is resistor and it’s valuve not given.D1 condencer valuve also not given please let me know. please describe alternate ic for the SG3526


can I know what is the current at the output stage of the inverter we get.


Hi, thanks for this post.What is the part no. for the resistor between pin 18 of the IC2 and pin 2 of the IC1A or pin 6 of IC1B


can u give me a list of components of that circuit


please I want the resistor value that is between IC1A and IC1B,
I will be expecting your positive response
best regards


Very powerful project,but sir it possible to make changes around the sg3526 to obtain a puresine wave?i want to make a puresine wave inverter.please help sir.tnx

Janardhan Reddy

very usefull but some values are missing in the diagram please send methise values like resistance between ic1 and ic2 and condenser values
and please say what is the alternative for ic3


Hey, can IRF540 be used in place of the mosfet?

Carl Strand

Hello could someone please draw up and explain a schematic for a circuit that will take a 115vac 360 watts max input and result in a 115vac 1500 watts output

Carl Strand

or some way to go from 12 or 24vdc to 130vdc THANKS

Olaide Raji

pls what is the value of the resistor betwen ic1a and ic1b pin2 and pin6 to ic2 pin1 and pin18

Olaide Raji

Thanks, may God bless you sir.

saeed azar niya

hi,thanks for funny your site,if can please put high frequency inverter(dc to ac) schematics.




Why R8 0.001 ohm resistor used??


can dis circuit ppower my laptop, tv set, home theatre, fan and bulbs?


helo. good site.this inverter can be used to pump central heating? god with you, sorry for my english


What ic1 number

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