Hi
Engineers and friends
I need a way to boost 12v dc to 48V dc
Please help me
Thanks

 

available source current?
required output current?

 

boost converter. It is possible. Just remember, power in equals power out.

 

boost converter. It is possible. Just remember, power in equals power out.

Not quite. Power out will always be less than power in. They will be equal only in an ideal universe, which this one unfortunately is not. I like to use 80% as a "rule of thumb" efficiency for a boost SMPS.

 

Does anyone know if any of the inexpensive boost converters have isolated outputs? (use transformer)

They generally only go to 36v out.

If they could be connected in tandem it would open up the possibility of higher outputs.

 

Just as an example, if your load requires 1A@48V you will need to supply about 5A@12V.

 

Hi friends
Source is 12v, 1.2mA
And output 48v and amper not important
Thanks All

 

Hi friends
Source is 12v, 1.2mA
And output 48v and amper not important
Thanks All

Why don't you explain "in detail" exactly what you are trying to do with this 48V signal and what are the details on this 12V source?

 

Hello,

I think this thread is the sucessor of his previous thread:
simply convert 12v dc to 300v

It looks like he is going lower and lower on the output voltage.

Bertus

 

Hi friends
Source is 12v, 1.2mA
And output 48v and amper not important
Thanks All

Then you will only get maybe 250 uA of current from the 48V side. You could just use a 555 free running (driving a 2N3904) with a coil/diode and a zener diode to clamp it at 48V.

 

Hello,

I think this thread is the sucessor of his previous thread:
simply convert 12v dc to 300v

It looks like he is going lower and lower on the output voltage.

Bertus

Hi
This is Separate of older thread
Thanks

 

Then you will only get maybe 250 uA of current from the 48V side. You could just use a 555 free running (driving a 2N3904) with a coil/diode and a zener diode to clamp it at 48V.

Hi and thanks for answer
This is exactly I want
You can give me a circuit
Thanks

 

Instead of a 555 timer IC and a transistor, you can use two transistors like the schematic on this page;
http://www.romanblack.com/smps/conv.htm

However you will need to change a few resistor values to make it run from 12v 1.2mA, and of course the output zener diode needs to be changed to a 48v type.

 

Hi and thanks for answer
This is exactly I want
You can give me a circuit
Thanks

Here is the basic circuit used in a circuit to boost 9V to about 39V (three 13V zener diodes in series clamp the voltage)..

 

Instead of a 555 timer IC and a transistor, you can use two transistors like the schematic on this page;
http://www.romanblack.com/smps/conv.htm

However you will need to change a few resistor values to make it run from 12v 1.2mA, and of course the output zener diode needs to be changed to a 48v type.

thanks
i simulation this circuit if proteus but not working

 

Here is the basic circuit used in a circuit to boost 9V to about 39V (three 13V zener diodes in series clamp the voltage)..

thanks
pwr=input voltage??
where is the output voltage

 

thanks
pwr=input voltage??
where is the output voltage

PWR is input, output is at the top of the three 13V zener diodes.

 

thanks
i simulation this circuit if proteus but not working

Then Proteus has failed or (more likely) YOU have failed to simulate it properly.

The real circuit works well and has been built by many people.

 

Then Proteus has failed or (more likely) YOU have failed to simulate it properly.

The real circuit works well and has been built by many people.

thanks
yes i think i must test in real circuit

here is proteus circuit and result:

 

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