How can you connect two 24v AC power supply to get 48v?
To get 48V from two 24V AC power supplies:
Connect in Series
- Make sure the two PSUs are identical or at least very similar: input voltage, current rating, and they are isolated from each other; that is, they do not share common ground.
Series Connection
- Terminal + of the first 24V AC power supply to the terminal - of the second 24V AC power supply. The remaining terminals, with the negative of the first supply and the positive of the second supply, will be your 48V AC output.
Result
- The voltage across the two left terminals equals the sum of the two individual voltages and hence 48V AC.
Key Points for Consideration
- Isolation: The power supplies must be isolated from each other to prevent shorting and grounding issues.
- Current Rating: The current output is determined by the lower of the two power supplies’ ratings.
- Phase-Alignment: If the phase alignment of the power supplies is not done together, it may be that the voltages do not sum together correctly. In that case, it would be necessary to ensure the supplies are in-phase with each other.
This is true for AC power supplies, just as it is for DC supplies in a series connection.