Basic step up dc-dc converter

Posted by Ilias-Man On Friday, February 24, 2012 29 comments

This is a basic circuit of a step up DC-DC converter which the output voltage is more than the input, the circuit could be used to power a 9v or more devices from a 6v or even a 1.5v battery, charge batteries (3-12v) with 1.5v solar cell...
The circuit uses an oscillator using Schmitt trigger, all types of oscillators works, one transistor (Ex: BD139 or similar), resistors, coil (many different types of coils work even a small DC motor works! or you can wind 60 turn on ferrite)




R1 and C1 determine the oscillation frequency, different types of coils perform differently at  frequencies changes.
I used 5v input and toroid ferrite, the output exceed 60v (no load). The output voltage will drop as the load go higher.

Other types of oscillators can be used:


Other one to use see here: Simple rectangular oscillator

7812 or 7805 regulators can be used to stabilize the output voltage. (remember not to exceed the maximum input voltage)


Thanks

29 comments:

wantoro said...

L1 = uh ?

doc-out-of-the-box said...

can I ask a question?
I need a 12v DC to 120 V DC transformer, to convert solar power (from batteries)
To power a lathe motor (120vDC). The system is about 1000w
Do you make such a device, or do you know someone who does?
Thanks
CHIP Moses

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Ben Winkel said...

Isn't the 7414N an IC? With multiple pins! Can you show how you connect them in the circuit?

bala krishnan Irulandi said...

What is the L1 value here in the circuit?

Applied Electronics said...

a very useful circuit

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Pradeep Kumar said...

These technical details had been of great help. Thanks for sharing!!Keep updating new posts on your blog!!
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Gururaj Kashikar said...

How much current can these circuits deliver?

Unknown said...
This comment has been removed by the author.
Артём Погребной said...

I inserted resistor R=9 Ohm instead of L1 and I got dc-dc converter from 3 V to 1.5 V

Jamz Gichai said...

Can I use a 1.5vdc cell to fully charge a car battery?

Steve Berke said...

I enjoyed reading your article :) PLease continue publishing helpful topics like this. Regards, from Let's get gadgets.

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What is the inductance value???

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