Designing a DC converter for positive to negative voltage

[sunknu]

Hi all

I am considering to design a DC Converter which can convert the positive voltage to negative voltage. Does any one have ideas about the componets, schematics of it, ...vv..

Thank in advance

Sunknu

 

[KST]

mc34063 boost 180v

Hi all

I am considering to design a DC Converter which can convert the positive voltage to negative voltage. Does any one have ideas about the componets, schematics of it, ...vv..

Thank in advance

Sunknu

There are many and many as ICL7660, MC34063, . . . . .schematics and the another informations which there is in the datasheet.
Good luck for U !

 

[sunknu]

Re: DC-Converter

Thank you for your advance, but I want to convert high voltage DC. ex from 180V to -180V. Could you give me another advance?

 

[dfullmer]

Re: DC-Converter

Hi,

These kind of questions always make me ask more question sorry in advance. I assume that the positive 180VDC you are starting with has a hard reference you can not change. Otherwise just make the positive side of this voltage referenced to gnd and there you go a negative voltage at 180Vdc. If this is not an option then.....How much current do you need? What kind of regulation does the -180VDC need to be within. What kind of efficiency do you require. What other voltage or power sources are availible. Line voltage ?


regards

dfullmer

 

[VVV]

Re: DC-Converter

If you do not need isolation, you can try an inverting regulator. It works like a boost, but the voltage is negative. It is sometimes referred to as a buck-boost, although I personally do not agree with the name.

If you need isolation, then a flyback is the way to go. The output can then be of either polarity, depending on how you connect the output.

 

[sunknu]

Re: DC-Converter

Hi

to VVV: Thanks for your idea. I will try.

to dfullmer: I need a power source. I have a positive power source and I need a negative power source. But I am not good at power conversion. So Could you give me more detail about it.

 

[dfullmer]

Re: DC-Converter

Sorry sunknu,

I been a bit busy, VVV is correct about the buck boost and the flyback. The files are a few circuit configurations that may help you decide. The link to the book is one that may help with the rest of the construction once you make the decision.


h**p://rapidshare.de/files/32989892/Newnes_-_Power_Supply_Cookbook__2001_.pdf


Regards and Good luck

dfullmer


ps the scans are from Solid State Power Conversion Handbook by Ralph Tarter

 

[sunknu]

Re: DC-Converter

Thank for ur books. I am going to read it.

 

[VVV]

Re: DC-Converter

Can you post the other requirements, such as output power (or current), etc?

 

[togarha]

Re: DC-Converter

Hi!!

I want to design a 24V-12V dc @5A-7A power supply to connect some car elements (12V) to truck battery (24V). Any suggestion???

Thanks in advance...

Regards,

togarha

 

[VVV]

Re: DC-Converter

If you can live with 4.4A, you can try the LT1074HV from Linear Tech https://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1042,C1032,C1064,P1006

They also make a 10A part, the LTM4006HV https://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1042,C1032,C1064,P14856
But the latter comes in a package that is harder to work with in a home-based lab.

I only provided these links, because these parts have internal swithces, which makes them easy to use.