Convert 500V DC to 220V AC

Hello Guest,

I trust you know what you are doing, as we want you to survive your experiments.

You refer to "Small Size".

1. Advise output in Watts as required
   
2. Advise output size length/breadth/width maximum.

Once you specify, then you may be assisted.

Reply with thank you.

Kind Regards....

Start looking at 'inverters'.

12VDC → 240VAC is a common beast, and size depends significantly upon power rating. They can be found in camping and caravan equipment retail outlets in the UK, an also marine equipment chandlers, as well as on-line electronics distributors.

500VDC → 340VAC might prove a little more difficult to find. What is the application?

you should point out the power rate output and the size you hope to get, so that the inverter frequency could be decided. because the higher the frequency you make, the small size yhou will get.

but the frequendy cannt be as higher as you hope, it depends on many conditions

The normal variable frequency drives sold by Omron, ABB, AB, Siemens etc take an AC voltage in, convert it to DC (and usually supply the DC to external terminals) then uses a collection of FETs to convert back to AC (at the appropriate voltage and frequency).

I haven't done it, but it should be possible to supply the DC and bypass the input stage. It will almost certainly involve switching off some of the error checking eg "Input phase lost".

Using a VFD will be cheaper and safer than trying to make your own.

Good luck ffeJ

You are absolutely right! I have given upto 350VDC to most of the above VFDs and got 220V 3 phase supply.You can use the single phase input VFD rated for 230V,1 phase.

http://electronic-components.globalspec.com/SpecSearch/Suppliers?QID=10180282&Comp=3910&fc=1

Since this is higher voltages : BE CAREFUL or you'll wake up dead. USE GFI's where possible.

If you want a CHEAPER SOLUTION: You could use inverter to convert 500 v dc to say 400 volts ac then use a variac connected to that 400 v ac to dial in the voltage you want including 220ac and 340 ac. You must be careful to get the wattage you need ( you didn't say what wattage or amps were) for all components including wiring and any connectors or receptacles. Put appropriate amps fuse (or preferably circuit breaker) into the hot wire line on the ac side and another fuse on the dc side between 500vdc and inverter. Triple tape or otherwise heavily insulate all wires connectors and other connect points.

Since this is higher voltages : BE CAREFUL or you'll wake up dead. USE GFI's where possible

P.S. A battery can deliver typically 650 -850 cranking amps and if the 500 v dc you speak of is from a battery bank, you can expect quite a bit of wattage at higher voltages (500 vdc -220vac) which is up to 425,ooo watts. Compare this with a 15,000 watt home central heating system and you will get the idea that you really need to wear rubber shoes, never touch more than one wire at a time, don't lean on metal cabinets or other mechanism (to prevent shock across the heart from arm to arm). Use lineman gloves (not rubber kitchen gloves). etc.

How many amperes are we talking?

It is simple to do if we know the amps.

There is one way (there are many).

use a dc-dc converter.then use an inverter for the ac voltage.

WHAT IS THE AMPERES?

FRom Canada

Guest,

Both answers from guest and TRIPLEBATTERYLIFE are what I was thinking about. VFD's are compact, powerful, and very easy to obtain. They rectify the incoming power into a capacitor bank then chop it up with IGBT's (typically) to simulate an output of any appropriate frequency and voltage.

Since their control programs assume you are operating a motor, you would have to work within the assumptions and format for the operator interface and programmable parameters. Since an AC 340V (RMS or root-mean-square) signal has a peak of almost 500 V, this DC input can easily be used for a VFD output of 340VAC.

Indeed, this fit between DC input and AC output is so good, it makes me wonder if you are asking us a homework question!

To get a lower voltage, you would have to set parameters accordingly. The posts cited above also mentioned possible problems with "missing" input voltage errors. I would add also the need to beware of low (or high) DC voltage errors because most VFD's are designed for a particular input AC voltage and a reasonable variation of it before they fault out. I strongly suspect that you can hack the program to allow lower DC bus voltages without faults (for Toshiba drives, this is their non-publicized "super user mode", which can destroy the drive if used unwisely).

Have fun--JMM

Just out of interest, where do you get 500VDC? I have never known anything to produce that sort of voltage. If it is already a converted output from another primary input, what is that other primary input?

Maybe it is easier to convert the "other" primary to your requirements.