How to design step-up/step-down DC-DC Converter (2V to 100V)

[bctang]

DC-DC Converters

Hi,

How to design step-up/step-down converter accepts 2Volt to 100Volt inputs?

I need to design Step-Up/Step-Down DC-DC Converts 2Volt to 100Volt input to a 12V output at up 2A. The output voltage can always maintain 12Volt.

Thank You

 

[rauol]

Re: DC-DC Converters

8) A very complex requirement.
very difficult in standard buckboost topology, try cascading differant converters with switching logic to switch a single dc dc converter depending on the input voltage..
:? A costly proposition..

 

[bctang]

Re: DC-DC Converters

Hi, rauol

First i need to say thank you for your suggest.

i known this is very difficult, because i am doing my project Design Micro Hydro System. My voltage from generator is variable it can generate up to ~70Volt. So that i need to step-down my voltage to charge my battery 12Volt. if the generator is runing at low rpm the generator generate low voltage about 2~11Volt. the my dc-dc converter need to boost up to 12Volt.

Can u try to explain more detail about the design because i need the low cost design?

Thank You.

 

[djalli]

Re: DC-DC Converters

Hi,

How to design step-up/step-down converter accepts 2Volt to 100Volt inputs?

I need to design Step-Up/Step-Down DC-DC Converts 2Volt to 100Volt input to a 12V output at up 2A. The output voltage can always maintain 12Volt.

Thank You

I do not think there is choice for you but to use switch mode power supply design.

 

[bctang]

Re: DC-DC Converters

Hi,

How to design step-up/step-down converter accepts 2Volt to 100Volt inputs?

I need to design Step-Up/Step-Down DC-DC Converts 2Volt to 100Volt input to a 12V output at up 2A. The output voltage can always maintain 12Volt.

Thank You

I do not think there is choice for you but to use switch mode power supply design.

Do you have any idea for this "switch mode power supply design" ?

 

[bctang]

Re: DC-DC Converters

8) A very complex requirement.
very difficult in standard buckboost topology, try cascading differant converters with switching logic to switch a single dc dc converter depending on the input voltage..
:? A costly proposition..

i have found out from internet:
"http://korea.maxim-ic.com/appnotes.cfm/appnote_number/227"

but this design is no functioning because i already testing. if increased input Vin to 4.35V. DMM at point 8 dropped to 1.69V, IC MAX761 getting hot.

 

[bctang]

Re: DC-DC Converters

Hi,

How to design step-up/step-down converter accepts 2Volt to 100Volt inputs?

I need to design Step-Up/Step-Down DC-DC Converts 2Volt to 100Volt input to a 12V output at up 2A. The output voltage can always maintain 12Volt.

Thank You

I do not think there is choice for you but to use switch mode power supply design.

Do you have any idea for this "switch mode power supply design" ?/quote]

Im agreed with djalli..try using switch mode power supply.

Do you have any idea how to design "switch mode power supply design". Pleas help me....

 

[rauol]

Re: DC-DC Converters

8) Do u really require 2 volt minimum input. can your micro generator supply around 15 Amp at 2 volt. a realistic one would be from 15 to 100 volts

 

[bctang]

Re: DC-DC Converters

8) Do u really require 2 volt minimum input. can your micro generator supply around 15 Amp at 2 volt. a realistic one would be from 15 to 100 volts

I am using "Permanent Magnet DC Motor" as my dc generator because my project just a demo unit. So that, i need the generator generate the voltage at low RPM. My generator generate the voltage is depend the turbine spin.

My generator can produce very high voltage but the current i no think so can produce until 2Amp. Because i think this is depant the load.

So, i need to control the voltage to fix and always maintain to 12Volt to charge my battery. I am using "Lead Acid Battery" 12Volt.