How to produce 5, 6 and 9V DC from a 3V DC battery ?

[bhekisizwe]

Hi evryone, does anyone have an idea of how to produce 5, 6 and 9V DC from a 3V DC battery as efficient as possible with less component count. The circuit should be very small, say, about a matchbox size. Thanks in advance. I know that we need a boost regulator but i dont want to design 3 different boost regulators for the 3 different output voltages.Thanks in advance

 

[xzp]

Power supply design?

I think you should try: Fly-back converter!
It is very simple and also good efficient.

 

[kender]

Re: Power supply design?

I know that we need a boost regulator but i dont want to design 3 different boost regulators for the 3 different output voltages

Make one boost for 9V and then make 5V and 6V with linear regulators.

There could be a more elegant way, which would involve a transformer with 3 secondary windings with different numbers of turns for 5,6 and 9.

Just my $0.02

 

[Rf engineer]

Re: Power supply design?

u may use an optocoupler IC i think 7800 series...search it on google...it will give u output of 5v and higher.....check for other modules.

googles is the best option...otherwise u may use bjt switch circuits....

 

[kender]

Re: Power supply design?

u may use an optocoupler IC i think 7800 series...

The original did not specify that he needs an isolated power supply. he doesn't need an optocoupler.

 

[AR15]

Re: Power supply design?

You can wind your own custom transformer if you have a ferrite ring. I have found them in old televisions. Wrap a primary winding through the ring, to apply to the boost converter. Then wrap seperate windings of various turns for each desired output.

 

[kender]

Re: Power supply design?

You can wind your own custom transformer if you have a ferrite ring. I have found them in old televisions. Wrap a primary winding through the ring, to apply to the boost converter. Then wrap seperate windings of various turns for each desired output.

The only question with this type of design: which channel to use for feedback?

 

[carrier]

Power supply design?

you can use step up(boost converter) cnverter using oscilator that vork with 3volt such as cmos component.
you can find this topology in any smps book.

 

[OradFarez]

Re: Power supply design?

The most efficient way would be three separate switching boost regulators. Maxim-IC makes so many different switchers and some of them are quite good at needing a minimum of external parts.

Stepping up such a low voltage to 9V and then linearily dropping it back down is going to waste huge amounts of power unless current drawn is pretty small.

This is what I would do In fact, if you choose a regulator with variable output, you can sample one part type and vary the voltages with a resistor in each circuit...simple!

 

[smilelangjun]

Power supply design?

I think use a boost converter and res network can produce these 3 voltages

 

[onlyusman]

Re: Power supply design?

think you should try: Fly-back converter!
It is very simple and also good efficient.

or use transformers of different turns
or check LM337 the refernce voltage regulator