Hi,
I'm looking to build a few bluetooth speaker systems and was wanting to find the optimal way to deal with the power situation.
Ideally I want a system like most consumer bluetooth speakers, which have a single power input port (usually micro USB), and the device can operate while plugged in, batteries will also charge, and it will seamlessly transition to being powered by the battery when uplugged.
I've done a bit of research and it appears this is not as straightforward to achieve as it may seem.
There are 2 cases I want to handle:
1. Low power speaker system (5v power/amplifier, about 5W)
For this I was thinking of either using a standard USB power bank with pass-through capability (apparently Xiaomi ones do, and for example: Zendure(R) A3 Portable Charger (10,000 mAh))
Alternatively, there are simple single-Li-ion cell charger modules like: Mini Charger Board Module Component Blue For 18650 Lithium Battery Charging
This is used in the following project:
Powerful Portable Bluetooth Speaker 2x5W: 4 Steps (with Pictures)
Although, I am not sure how they would work with pass-through power capability (power device while charging battery)
2. Higher power speaker system (12v power/amplifier, about 15W)
There are 12 v car jump starter power banks, but I'm not too sure about any pass-through capability.
2017 Mini Starting Device Car Jump Starter 12V Car Charger for Car Battery Booster Portable Starter Power Bank Buster Lighter-in Jump Starter from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
Alternatively I was thinking of going for a 3S Li-Ion cell system (up to 12.6V) using a protection board like this: 3S 12.6V 20A Cell 18650 Li-ion Lithium Battery Charger BMS Protection PCB Board | eBay
This is used in following project: http://diytechandrepairs.nu/build-bluetooth-speaker-box/
But it seems the protection board in its own is not ideal for charging the batteries using a standard 12v DC supply, as discussed here: https://www.youtube.com/watch?v=KYnxmXvkMYE
I found it hard to come across a 3S lithium battery charging module similar to the single cell one, however there is this: https://www.youtube.com/watch?v=cGZ4SX6Ywrg
Seems a bit overkill though ($10 each, and still need protection board)
So basically, is there some nice streamlined solution to all this?
Or do I need to go down some more messy route of using diodes to merge power source input & battery output to load?
Or use a manual switch to choose between charge & direct power modes?
Thanks for any help
Cheers
I'm looking to build a few bluetooth speaker systems and was wanting to find the optimal way to deal with the power situation.
Ideally I want a system like most consumer bluetooth speakers, which have a single power input port (usually micro USB), and the device can operate while plugged in, batteries will also charge, and it will seamlessly transition to being powered by the battery when uplugged.
I've done a bit of research and it appears this is not as straightforward to achieve as it may seem.
There are 2 cases I want to handle:
1. Low power speaker system (5v power/amplifier, about 5W)
For this I was thinking of either using a standard USB power bank with pass-through capability (apparently Xiaomi ones do, and for example: Zendure(R) A3 Portable Charger (10,000 mAh))
Alternatively, there are simple single-Li-ion cell charger modules like: Mini Charger Board Module Component Blue For 18650 Lithium Battery Charging
This is used in the following project:
Powerful Portable Bluetooth Speaker 2x5W: 4 Steps (with Pictures)
Although, I am not sure how they would work with pass-through power capability (power device while charging battery)
2. Higher power speaker system (12v power/amplifier, about 15W)
There are 12 v car jump starter power banks, but I'm not too sure about any pass-through capability.
2017 Mini Starting Device Car Jump Starter 12V Car Charger for Car Battery Booster Portable Starter Power Bank Buster Lighter-in Jump Starter from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
Alternatively I was thinking of going for a 3S Li-Ion cell system (up to 12.6V) using a protection board like this: 3S 12.6V 20A Cell 18650 Li-ion Lithium Battery Charger BMS Protection PCB Board | eBay
This is used in following project: http://diytechandrepairs.nu/build-bluetooth-speaker-box/
But it seems the protection board in its own is not ideal for charging the batteries using a standard 12v DC supply, as discussed here: https://www.youtube.com/watch?v=KYnxmXvkMYE
I found it hard to come across a 3S lithium battery charging module similar to the single cell one, however there is this: https://www.youtube.com/watch?v=cGZ4SX6Ywrg
Seems a bit overkill though ($10 each, and still need protection board)
So basically, is there some nice streamlined solution to all this?
Or do I need to go down some more messy route of using diodes to merge power source input & battery output to load?
Or use a manual switch to choose between charge & direct power modes?
Thanks for any help
Cheers
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