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250W Power Supply for mobile Speakers
250W Power Supply for mobile Speakers
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Old 10th July 2019, 09:41 PM   #1
TomTom92 is offline TomTom92  Germany
diyAudio Member
 
Join Date: Jan 2019
Default 250W Power Supply for mobile Speakers

Hello everyone,

a problem occuring for everyone building portable speakers is the management of the supply.
State-of-the-art are lithium-batteries, thus, a kind of management system, so called BMS is required.
Most of the available BMS are "China"-solutions, cheap, but reliability might be an issue.

Same goes for DCDC-Converters, there are dozens of 5-ebay-converters, and few converters with well known and non-fake components.

As a result, we decided to build those components on our own.
The "energy management system", EMS, shall include:
  • BMS for cell-management and balancing a 4S-Liion-Pack
  • a dedicated, up to 4A charge controller for the freedom of using different AC-adapters, solar cells, external battery-packs and so on
  • a DCDC-Converter for a boost up to 34V@150W without heatsink, and 250W with heatsink.

To drive things further, an option to use envelope-tracking to controll the DCDC-output voltage will be implemented. Furthermore, a simple SoC-display with 5 LEDs will be included.

At the moment, the schematic design is 80% done, some layout-preplacement is already done too.
We will use a 70m-2-Layer board with dimensions: 65x140mm


Concept:
250W Power Supply for mobile Speakers
Overview.PNG

It's a very extensive project ... can you have a look at the shematics - maybe some last tip, bugs?
Powerboard_rev1.pdf
All Ideas about the component selection
(to large for the forum-upload)

If the project is successful and the bugs are cleared - a small batch of production might be possible, prices are tbd.
best regards, everyone!

Saniiiii & TomTom92

Project Progress:
03.08.19 - shematic ready, starting pcb layout
Shematic (PDF)

Last edited by TomTom92; 3rd August 2019 at 06:25 PM.
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Old 22nd July 2019, 01:13 PM   #2
TomTom92 is offline TomTom92  Germany
diyAudio Member
 
Join Date: Jan 2019
Updated!


(&placeholder for project progress ...)
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Old 22nd July 2019, 08:05 PM   #3
saniiiii is offline saniiiii
diyAudio Member
 
Join Date: Jun 2015
Im here too, feel free so ask questions
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