First time post - hello all.
I'm looking for a power supply solution that I assume already exists - I dont think I'm trying to re-invent the wheel but can't find a product? I'm quite capable of building electronics projects but I don't have the design capability. This problem seems frustratingly simple but has left me without a resolution.
I have an instrument - normally powered by a 12V car battery.
It outputs very short duration pulses of 1A or 8A (power on for max 20 ms and off for up to 50 ms - full cycle up to 8 minutes - max 20 times in a day)
In order to boost output (up to 16A or 20A (this is the max)) we add another 12V and a 6V battery, thus providing 24V or 30V in total.
I'm looking to take one 12V car battery but have some kind of DC/DC converter(s) that I can hook up to the 12V battery and select the output for either 12V, 24V and 30V - be that 3 seperate converters (in one neat box I can build) or output voltage selectable by changing a resistor value, etc.
The max output from the instrument is 20A at 30V, which is 600W. So I guess the input current to supply that capacity from one 12V battery, in the worst case scenario, would be 50A plus a bit for losses due to inefficiencies.
Any thoughts? I have Googled a lot to no avail. The units I've found have too high input voltage, not enought power capability, wrong output voltages, etc.