how to convert DC to AC??

majeed11

how can i convert DC to AC from a battery(any voltage) for a transformer...?????

sepowens

You need what is called an inverter. It takes the DC voltage and turns it into AC. It would be very helpful to know what you are wanting to do with this as there are a variety of parameters that can affect your choice of inverter depending on the voltage and purpose. Some cheap inverters for getting 120/220 mains AC from a battery or battery bank do not make pure sine waves and can destroy microwaves, computers, etc.

majeed11

for transformers i have to input it with AC only....but how can i convert it from a battery...i require low voltage AC(may 6-12V) for the transformer ...

sepowens

I will try to make the questions you ned to anwer clearer.
First, you need 6-12 volts FROM the transformer. What voltage, AC frequency and how many watts do you need going into it?

Now, the second part of myquestion again: What are you going to DO with this voltage? What frequency of AC is required for the transformer ANDthe circuit it is driving? How sensitive is the driven circuit to the waveform of the AC, e.g. audio circuits will click and hum, computer circuits may just die, clock circuits will not keep time, etc if the waveform is not a fairly close to a sine wave....

edmondng

just step down the 120vac to 6-12vac. is that possible or your main supply is battery (small device?)
otherwise just use a digital/analog converter to create your sine wave, go through an amplifier (with supply +-15v) to amplify amplitude

hajirandi

sir i want to convert (12v DC )to (12v AC) plz tell me the name of converter or sujjetiojn that can i build it or not ... plz guide me kashif

isly ilwott

Mechanically...take a 12vdc motor and drive a 12vac alternator.

Electrically...build an invertor.

To make it smooth...add 60Hz band pass filter.

berkeman

This is the kind of circuit that is being suggested to you, a "Power Inverter":

http://en.wikipedia.org/wiki/Power_inverter


.

fest777

hello iam trying to invert 120 dc to 120 ac, have a generator exciter that puts out 120 dc only, would like to invert to 120 ac to run small tools thanks anthony

russ_watters

First google hit for "120vdc inverter": http://www.novaelectric.com/dc_ac_in...120cabinet.php

fest777

russ thanks for reply, the unit i saw is way too expensive , is there a simple circuit i can build to invert 120 dc to 120 ac thanks anthony

berkeman

What experience do you have working with voltages above 60V? And what experience do you have designing and building equipment to comply with Underwriters Laboratories (UL) standards?

fest777

very limited, iam very good a reading schematics and building things yet i don not have an electrical engineers degree. , any good ideas would help

TVP45

If you have a 6V or 12V battery and you only need a little current (< 1A), you could always pick up a solidstate radio vibrator. They run about $25 US.

vk6kro

Some portable power tools used on 230 volts use DC series wound motors on AC.
The field coil is in series with the rotor winding.

Not sure if this is the same with 110 volts, but if it is, then the 120 volts DC will work OK with such power tools.

You can easily check. With the tool unplugged, take out the screws and look at the wiring. If it goes through the switch, through the field coil, through another field coil then to one of the brushes on the rotor and from the other brush back to the power cable, then it is a series would motor.

If it has a speed control in the trigger this probably depends on it getting AC, so the tool would be unsuitable for running on DC.

skeptic2

The simplest, cheapest way I can think of is to use a DC relay that will operate at your supply voltage and wire one of its NC (normally closed) contacts in series with the coil and in series with the transformer primary. This will not give you a 60 Hz sine wave but you will have AC at the secondary of the transformer.

zohaib javed

hello can anyone tell me about why we use ac at particular performance and not use dc.where dc is required what is its reason of must use of dc,and similarly for ac?