Step by Step: Make an Inverter’s power stage (MOSFET)
Posted inInverter

Step by Step: Make an Inverter’s power stage (MOSFET)

97

Here I show how to make the Power stage of an homemade inverter. I’m using the following,

  • Old UPS transformer
  • 2x Alluminium Heatsink
  • 2x N-MOSFET (IRF540N, P55NF06, B150NF55 etc)
  • Screws, spade terminals, wires, etc

First we need to place the MOSFETs in the heatsinks in appropriate place so that the heat tab i.e, metal part of the MOSFET body is as close to the mid area of the heatsink. This way more heat will be dissipated by the heatsink.

Now we look at the transformer salvaged from a Microtek UPS. This has a lots of pins for different voltage outputs in one side and 3 input lines for 7.2V–0V–7.2V.

Now we attach the spade type connectors to the primary wires by using a pliers.

The pro of using spade type connector w.r.t using ring connectors is that we can easily mount/unmount them by loosening and tightening the screw, without completely unscrewing them.

We insert the terminals of both 7.2V lines to the heatsinks of the MOSFTEs in the same screws.

Now we connect the battery negative connector to both MOSFET’s 3rd pin.

Now we take a 3pin connector and connect the middle pin with the negative line , and connect the rest two wires to the 1’st pins of the MOSFETs i.e, the GATE terminal.

Now this is ready to be connected to a battery and the connector can be connected to an inverter oscillator board like 74LS112 Inverter Oscillator.

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97 Comments

  1. david
    Reply
    August 12, 2013,

    thank you so much.its solve my problem.but what the use of resistance..i see a lot of resistance and condencer..around the mosfet.
    Help me

    thanks
    David

  3. Akhilesh.h.n
    Reply
    August 16, 2013,

    I’m very happy to see you projects thank for this wonderful site
    I’ve got a doubt I’ve seen some 8 pin transformers in inverter circuits what is that how do i test it and know its ratings.

  4. ajay
    Reply
    September 17, 2013,

    hello arup , i am in need , please have a meet with me .

  5. ajay
    Reply
    September 17, 2013,

    any one who have knowledge in electronic circuits , please meet me at 9015404168. i m proprietor at futuretechelectricals.

  6. rahul
    Reply
    September 19, 2013,

    hi arup
    i am rahul
    jab mai ups power button press kar raha hu toh power nahi a rahi hai main sa or battery sa please can you help

  7. Ben3nity
    Reply
    September 20, 2013,

    Hi arup,pls am working on an inverter projet but would like to know b/w CD4047 and SG3524N, the best to use as my driver generator!!!

  8. M.Bakarman
    Reply
    September 21, 2013,

    Thanks Arup it’s a great job but ics, relays small transistors on the board for supplying power

  9. chandrashekhar
    Reply
    September 30, 2013,

    hi arup

    i am making a inverter it is working but my problem is it consume

    lot of amp without any lode it consume 13amp what i can do

  10. Shaji
    Reply
    March 18, 2017,

    In my inverter 10uf 400v non polar capacitor iremod but in reconnecting time i forgot conection place so plese tell me conct ponts

  11. samrat yadav
    Reply
    June 18, 2017,

    Hi! Arup bro mera inverter garam bohot ho jata usme fan kaise install karu plsss help me

  12. Jitendra kr
    Reply
    April 16, 2018,

    Mere pass microtek ups ka transformer hai .mai ek simple watt ka inverter banana cahata hu please details me information dijiye

  13. Sayanth
    Reply
    November 9, 2018,

    I have 12-0-12 5 Ah transformer ,I will use this

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