Newbie
Joined: 05/07/2019
Location: ItalyPosts: 23
| Posted: 03:21pm 03 Sep 2021 |
Hello everyone!
Thanks to Peter (Podia) for sending me some pictoverter PCBs and for all support offered in private messages!
I finally managed to set up a test bench using the picoverter loaded with the Nanovariac firmware so I can vary through potentiometer the output voltage to check a few things, I'm not using feedback for now.
I use a power supply to power the picoverter with a DCDC Converter 24V => 15V and to enter direct in AliExpress inverter.
I'm using an Aliexpress 24V inverter as a power board.
In the picture you see everything including waveform with mini DSO.
The DMM scores about 200V because under load the tension drops a little bit and also because I didn't want to go beyond at this test phase.
Always in photos behind the DMM we see distortion at about 2.78% on the voltage.
I would have expected less than 1%.
I also used an inductance formed by three ferrite rings with a bit of a spire of cable in series with the primary of the transformer.
The transformer was of a dead UPS. It's big enough, I respect 500W.
On the secondary side HT I used a 2.2UF WIMA capacitor.
I would have asked you some questions ...
- Is it normal that with a load of less than 100W of bulbs after about 15min enough warmer is the inductance and the transformer while the inverter heat sink remains cold?
- How can I estimate the best DC voltage to understand if the transformer is working properly?
- same thing with the inductance and exit capacitor, as I can have a feedback on filtering efficiency / exchange with the transformer?
I am afraid that the transformers from UPS are not properly sized as windings / flow to provide continuously a few watts while maintaining a good outgoing waveform.
Thanks for the advice, see you soon A.
Edited 2021-09-04 01:22 by iannez