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:
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 70µm-2-Layer board with dimensions: 65x140mm
Concept:
250W Power Supply for mobile Speakers
It's a very extensive project ... can you have a look at the shematics - maybe some last tip, bugs?
View attachment 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)
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 70µm-2-Layer board with dimensions: 65x140mm
Concept:
250W Power Supply for mobile Speakers
It's a very extensive project ... can you have a look at the shematics - maybe some last tip, bugs?
View attachment 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:
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