Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1860
| Posted: 06:03am 07 Jan 2023 |
Following on from a question I asked on Page 1 of this post, it was about converting a 24v inverter to 48v. I traced out the circuit of the 12v main switching regulator. It appears to be able to run with no change from 6v to 60v.
That would make sense, it makes it easy for the supplier to make one board to cover 12v to 48v or more, and change a link for 50/60hz option, it appears that all they do when you select a voltage option is adjust the Low voltage and Over voltage cutout pots to suite that voltage.
I ran it up to 60v (no transformer and the control the board stays turned off) and everything was fine. Regulated 12v was perfect and the switching regulator was happy, no change in Reg PWM wave shape. The Reg uses an IRF540N and a tiny control board has an 8 pin surface mount chip and a few passive components, could actually be a 555.
The newer inverters that auto detect input voltage (12v to 60v) use the exact same 12v switching regulator, they auto set over voltage and low voltage cutouts (no adjustments) and you only select the frequency (50/60) and the battery type for the unit you purchase.
BTW ALL caps are rated at 100v where they need to be.
As a refresher, the pictures of my 24v unit in question.
So this should give me something extra to play with at 48v.
Edited 2023-01-07 18:15 by KeepIS