Ebay 500Watt DCDC boost inverter 12 to 220/380 volt.

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Dear Reader,
I have found at ebay a Boost inverter module called "**broken link removed**"
I'm interested in using this DCDC module but would like to know if some has experience with it. Specificity I would like to know
  • Can this module handle 500Watt continuously.
  • Under full load can it keep up the DC voltage.
  • What is the efficiency is of this module at full and half load.
If some one has experience with this module I would like to know this experiences.
Thanks for the help and regards. :thumbsup:
Oscar Goos

This is the module
 

as far as I can tell it converts 12vdc input to AC output.
It looks like that output is a square wave at 20khz.
..you called it a "dcdc" module, but this is dc to ac.

Is it some kind of inverter for powering fluorescent tubes from a 12vdc supply..i think so.
 

hi , This module is dc to ac converter , outuput frequency is 20khz. you cannot use this to drive inductive loads like motors. you can use this to power only incanscedent bulbs. any other loads like cfl , mobile charger, television will be malfunctioned beacause their rectification diode may not work at 20khz also it 20 khz can cause interference with internal circuitry. but you can filter the 220v ac to 311v dc externally using highspeed diode and high esr capacitors then you can drive loads like cfl , tv , mobile charger , or anything which works on 300v Dc or 230v (Ac/Dc).
It is always safe to drive lesser load than rated , it depends on mosfets on that board.
you will need large heatsinks for safety.
yea output voltage will be constant under all load.
efficiency will be maximum under maximum load.
 
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    wogoos

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I'm not sure what the hell this thing is supposed to be used for. It apparently is just a high frequency push pull driver, with no pwm sine wave, so it can only be used with resistive loads like incandescent bulbs or heating elements. The product description suggests that it can be used with "non-inductive home appliances" or "LED light, mobile phone charger and DVD set-top box," which is definitely not true.

No telling what the efficiency is, but I assume that to run it at full load for long periods you'll require forced air to keep it cool. What do you want to use it for?
 

I THINK IT COULD BE USED TO POWER THE OLD TYPE OF FLUORESCENT BULBS THAT DONT HAVE A DRIVER IN WITH THEM (sorry about capitals)
 


Hi vishwasvogga
Yes you are right Its a mistake from my side, its and DC AC 20KHZ inverter which needs rectification. i want to use it as a first boost inverter together with a post sinewave inverter stage. Thanks
 

If you buy it then please post a photo of it smoking when driving a 500W resistive load. I think the smoke will form the letters, "ebay".
Then short it and record the explosion in a video.
 

i want to use it as a first boost inverter together with a post sinewave inverter stage. Thanks
Click to expand...
so you mean you want to filter the 20khz square wave into a sinewave, then rectify the sIne to give you DC?
 

Hi all
Thanks for your respond. I assumed that most of you are know with inverter architecture and understand that this unit is a first stage boost amplifier which after rectification and some extra feedback circuitry provide a high DC voltage to a post sine wave inverter board to convert the 220/380 Volt DC in to a sine wave signal. Not the 20KHz AC output is filtered to create the sine wave the output needs to be rectified. A post sine wave board will create the 50/60Hz sien wave by using PWM. My only question was if some one has experience with this board and if it worth to be used.
From your reaction I understand that not many of you have experience with this board.
 

treez said:
so you mean you want to filter the 20khz square wave into a sine wave, then rectify the sine to give you DC?
Click to expand...
No after rectification of the 20Khz output and some feedback signalling a post sine wave board can doe the conversion from DC to sine wave.
 

Audioguru said:
If you buy it then please post a photo of it smoking when driving a 500W resistive load. I think the smoke will form the letters, "ebay".
Then short it and record the explosion in a video.
Click to expand...
I expect more from an Advanced Member level 5. I asked who had experience with this board. To see if this product fight go up un smoke was the reason to ask if people had experience with this module. For your knowledge, All HF inverters have similar input circuits to step up the 12/24VDC to higher voltages.
 

wogoos said:
I asked who had experience with this board. To see if this product fight go up un smoke was the reason to ask if people had experience with this module.
Click to expand...
Given there are only half a million members and out of those there are far fewer experienced advanced members, the likelihood of one of them happening to buy the exact same module you bought from ebay (where there are numerous different modules from fly-by-night companies and copy cat grey market products from china being sold) is probably similar to winning a lottery.

If you want someone with experience with that exact module then ask the question on the ebay page where it's sold and maybe you'll get lucky and a previous buyer will answer your question. Another option is buy a bunch of them and send them to all the advanced members of the board that frequent the Power Electronics section for testing and experimenting with. :thumbsup: Otherwise all the members here can do is just give you general advice on the topic.

[BTW, please don't send me one, I've got enough junk in my house as is :laugh:]
 

My guess would be that this gizmo is for driving electroluminescent panels, probably fairly large ones. I suspect the various output voltage tappings would be for adjusting brightness.

There may be some significant problems involved in using this for a totally different purpose.

Its very likely designed to run off a fixed and regulated 12 volt dc supply.
Running it from a battery may cause some fairly dramatic changes to the output voltage, as it would not be designed to accept large changes in either input voltage or output load.

In normal operation it just runs of exactly 12.0v and always drives the same identical load.
As it has no output rectifier, it probably also has no output voltage feedback, and probably no current limit or protection against overload.

All speculation....

But my gut feeling is that this is a less than useful device that may quickly die if you try to push it.
 


Hi ads-ee,
I do read a sence of humor here. Its appreciated. Thanks
 

hi woogoos , If board is not able to supply 500watts , you can add simillar mosfets in parallel , i have expeerience in this field , but i had done my own dc-dc converter. but you can use ebay one but no gyaranty of 500 watts , but you can add mosfets in parallel.
 
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    wogoos

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500W at 12V is 41.7 amps DC input minimum, the board doesn't look like it would handle that for very long.

Sure you can buy it and test it, but don't be surprised if it doesn't work very well above ~200W nor that it does not like feeding a bridge rectifier and a big electro...
 
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    wogoos

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Hi Oscar,
Late reply but to clarify for other readers what this module is for. The inverter is to povide 380vdc after rectification for conversion to 50hz ac sinewave with modules like EGS002.
Well at least that is what my supplier reckons.

I have used this module in 2 scenarios, 1 as low power inverter as described above, never pushed it to 500w though, just around 200w max but it could do more with adequate heatsinking and forced air.
2nd scenario is with a SPWM module based on a PIC16F716 chip that has a sync input to allow phase sync with existing AC supply to supplement the load current. I use this from some spare solar panels for off grid while main panels charge batteries.
So far none of the 4 i use have blown up.
Use must use shottky rectifiers to convert output to DC before passing output to EGS002 module in circuit as reccomended on the datasheet.

Hope this helps.
 
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