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Subject: Re: have inverter plans need help

Date: 04/23/02 at 10:44 PM
Posted by: Russ Kincaid
E-mail: russlk@yahoo.com
Message Posted:

In Reply to: have inverter plans need help posted by dvdljns on 04/23/02 at 12:04 AM:

The parts list indicates that this is an oscillating inverter, which is very inefficient. You should be able to rewind a 2000VA transformer that would work, but you are looking for 120 volts, 15 amps output, which means the input will be about 215 AMPS average with a 12 volt source with 500 or 1000 amps peak because the transistors are turning on and off at the same time, so for a short time both are on which is like a short on the power source.

You would do better to look for a better circuit, one using a control IC like TL594 (Texas Instruments) or SG3524 (Signetics or other vendor). These ICs have a dead time between turning one transistor on and othe other off, so the efficiency is higher and the current requirements are lower. You will still need a 200 amp transistor if the source is 12 volts.

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