Edward2107171
New Member
Hi,
I have a project that requires 45V at 100A from a 12V supply, I want the design compact so I don't want to play around winding bulky transformers and expensive IGBT's / FET's.
I want to go with a boost converter, I can currently build a cheap 5A output version from surface mount components making it very small, of course I would need at least 20 of these modules to achieve my 100A current. Building it modular means I can increase the power easily at a later date.
I'm no expert at power supplies so I need a little guidance. So, from what I've read it's a big no no to tie boost converters in parallel. I have however seen many modules doing such a thing and that many datasheets show a multiple unit sync circuit. I imagine that if I were to sync them all together they would all still individually manage their own currents so none would be overloaded, the issue I can see is the voltage regulation if different modules are running at different currents.
The chip I will be using is the UC3843
Figure 23 in the below datasheet shows using a 555 timer to synchronise the duty cycles, it doesn't mention anything about the voltage feedback which I assume can all be tied together since they are measuring the same source. Is synchronising the duty cycles going to work?
https://www.st.com/content/ccc/reso...df/jcr:content/translations/en.CD00000966.pdf
Any thoughts or circuit diagram examples of parallel boost converters.
Many thanks
I have a project that requires 45V at 100A from a 12V supply, I want the design compact so I don't want to play around winding bulky transformers and expensive IGBT's / FET's.
I want to go with a boost converter, I can currently build a cheap 5A output version from surface mount components making it very small, of course I would need at least 20 of these modules to achieve my 100A current. Building it modular means I can increase the power easily at a later date.
I'm no expert at power supplies so I need a little guidance. So, from what I've read it's a big no no to tie boost converters in parallel. I have however seen many modules doing such a thing and that many datasheets show a multiple unit sync circuit. I imagine that if I were to sync them all together they would all still individually manage their own currents so none would be overloaded, the issue I can see is the voltage regulation if different modules are running at different currents.
The chip I will be using is the UC3843
Figure 23 in the below datasheet shows using a 555 timer to synchronise the duty cycles, it doesn't mention anything about the voltage feedback which I assume can all be tied together since they are measuring the same source. Is synchronising the duty cycles going to work?
https://www.st.com/content/ccc/reso...df/jcr:content/translations/en.CD00000966.pdf
Any thoughts or circuit diagram examples of parallel boost converters.
Many thanks