First time post - hello all.
I'm looking for a power supply solution that I assume (?) already exists - I don't 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'm somewhat limited on 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 short duration pulses of 1A or 8A (power on for max 20 ms and off for up to 50 ms - full cycle 2 to 8 minutes - max 20 times in a day)
In order to boost the output current (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 into the field 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 or 30V - be that 3 separate converters (in one neat box I can build) or output voltage selectable by say a rotary switch changing resistor values, 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 enough power capability, wrong output voltages, etc.
Many thanks
Pete
I'm looking for a power supply solution that I assume (?) already exists - I don't 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'm somewhat limited on 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 short duration pulses of 1A or 8A (power on for max 20 ms and off for up to 50 ms - full cycle 2 to 8 minutes - max 20 times in a day)
In order to boost the output current (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 into the field 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 or 30V - be that 3 separate converters (in one neat box I can build) or output voltage selectable by say a rotary switch changing resistor values, 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 enough power capability, wrong output voltages, etc.
Many thanks
Pete