I've got a project that requires a variable output between 24-48V. This needs to be continuous-current, not PWM.
Items that I have handy from my 'box of bits', and ready to work with are: an 0.6-36V Variable Boost Converter, and a 12V Regulated Switching Power Supply. Obviously, I'd prefer to use these rather than purchase a specialised supply if possible.
There are two things that I know at this point, therefore:
- I can use the 12V supply as the input to the Boost Converter, but the output voltage won't be high enough.
- If I had a 12V battery, I could add this in series with the Boost Converter output, to get a variable output from 12.6-48V.
The diagram below shows 'Point 2'. There is a 12V source in to the Boost Converter, and an additional 12V source in series with the output, leaving me with a variable 12.6-48V. This is great, except for the fact that I only have one 12V source.
Which then brings me to my question, can I use the 12V supply in place of the battery, in series with the output from the Boost Converter? There are now effectively connecting wires going from the output of the boost converter back to the input, which makes me nervous!
The image below shows the same circuit, but with the wires linked back to the original 12V source, rather than to a second one.
I have built the closest circuit I could in Falstad to hopefully illustrate what I'm thinking. They don't have a Boost Converter component, though!
- Could this work as a solution?
- Is there a way to effectively split the 12V source into two separate supplies so I can enact the first diagram?
- Failing the above, do you have a hardware recommendation for a source that's directly variable through the appropriate range?