# COMMUNITY : FORUMS : TECH

## Increasing DC voltage

I need to increase the voltage of a battery from ~30v to ~230v, the only way i can think of doing this is somehow pulsing the DC rapidly to create a sort of "pseudo AC" then using a standard transformer to increase the voltage, followed by the standard rectification process. My problem is how to pulse the DC (bearing in mind the pulse will probably need to be in the order of kHz, and the device being powered at 230v has a power rating of 400W) and how to after the rectification process implement a pwm system. In addition, the method of increasing the voltage strikes me as extremely inefficient, so if anyone has any other ideas I would be very great full. Thank you for any help you can provide.

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Danny smith12184 years ago
Im using 36 volt deep cell batteries. I need 144 volts. Without woring them into series can i increase the volts with a inverter. i and can i charge the 36 volt battary with a 36 volt altanator.
4 years ago
You will need an inverter to boost the battery power to mains power.

To charge batteries you need to put more voltage in than what comes out. But how much you need depends on what kind of battery you have and how it needs to be charged.
gmoon8 years ago
You should probably just purchase a 230V inverter... but you'll need a bank of batteries to run it for very long.

That'll require a lot of current on the primary. At that wattage, you're looking at a current output requirement of nearly 1.8 amps @ 230V.

With an input voltage of 30V, that's a 1:7.666 step-up ratio. The available current decreases on the secondary by the same factor as the voltage increases, so your pulsed source must be capable of supplying 7.66 X 1.8 amps, or about 14 amps on the primary coil. Or more, since there's some loss in the process.

That means finding a 1:7.665 ratio transformer that can handle 14 amps continuously...and a battery and pulse generator that can supply it.
Jaycub8 years ago
I designed this oscillator for a similar purpose.
Sandisk1duo9 years ago
csharpdeveloper (author) 9 years ago
sorry for being stupid, I always forget the obvious! Any ideas for pwm? Also, would special considerations need to be made for running inductive loads?
NachoMahma9 years ago