Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 115 - diyAudio
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Old 9th October 2012, 11:51 PM   #1141
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Quote:
Originally Posted by glt View Post
Wow, thank you so much. Let us know the cost including shipping.
Thanks glt for your kind thought. I posted them in letters, so the shipping were just the postage. Cables are less than a couple of bucks. I don't think you need to pay anything. But if you really want, making some donations down the road to support my R&D would be appreciated .

Regards,

Ian
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Old 10th October 2012, 01:43 AM   #1142
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Default Passive battery management board

The idea of this passive battery management board is very simple. It’s just a DPDT relayJ. The principle is: Battery is switched to output at working time and switched to charger when the control voltage is gone. There are four groups of connections: battery, output, control voltage and charger. They are all isolated (no any connection) from each other if disconnected (include ground). So, no any EMI noise is expected to be introduced into the output.

Battery type, voltage and charger have no relationship with this battery management board. So, all kind of batteries with corresponding chargers are possible for this small board.

Three kinds of most popular relays with different size are available for this board. Relay selection will be up to how much output current is required.
The battery manage board is not limited to FIFO or clock board application. It’s a universal design and works for any application which needs batteries as power.

Battery board can be stacked on top of the clock board. Or they may also be stacked over each other to setup a battery management array for multi-group battery applications. In this case, different management board can share a same control voltage, or a high current battery charger if batteries have same voltage from different groups.

System power supply could be used as the control voltage to make all batteries synchronized with it.

Some surrounding components are optional. They can be setup into coil power saving circuit, battery and charger protecting circuit, current limiting resistors for trickle charging, LED indicators, battery monitor and etc.

I hooked up this battery management board to my system yesterday. It works very well with my FIFO KIT together with the isolator board. The concept is approved working! I’m just happy with it. I don’t need manually connecting the batteries anymore, as well as picking up them and charging them separately time by time. It works more like a real system rather than a testing projectJ.

Maybe I should post the schematics later on, but I’m sure you already know everything about it from the pictures.

Ian
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File Type: jpg _MG_5227.JPG (600.7 KB, 227 views)
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Last edited by iancanada; 10th October 2012 at 01:45 AM.
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Old 10th October 2012, 04:19 AM   #1143
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do want!
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Old 10th October 2012, 04:23 AM   #1144
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i'll need the large relay, i've found that in the past even if the supply current doesnt trip/exceed the limitations of the smaller relays, the inrush of small banks of lowZ caps does, so the contacts simply wont open
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Old 10th October 2012, 08:59 AM   #1145
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Awesome Ian!
When do we start placing orders? HeHe.
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Old 10th October 2012, 09:07 AM   #1146
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iancanada very very great work !!!
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Old 10th October 2012, 09:08 AM   #1147
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Perfect solution, Ian!
Another beauty.
Ed
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Old 10th October 2012, 09:18 AM   #1148
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Originally Posted by qusp View Post
i'll need the large relay, i've found that in the past even if the supply current doesnt trip/exceed the limitations of the smaller relays, the inrush of small banks of lowZ caps does, so the contacts simply wont open
I am just thinking out loud here, maybe there is value in a soft start for batteries? Maybe 2 relays and initial 5 seconds or so there is a resistor in series before it is switched out.

5A mechanical relay isn't going to last long with 60A+ short circuit from a LiFePO4 battery ...
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Old 10th October 2012, 11:22 PM   #1149
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Quote:
Originally Posted by qusp View Post
i'll need the large relay, i've found that in the past even if the supply current doesnt trip/exceed the limitations of the smaller relays, the inrush of small banks of lowZ caps does, so the contacts simply wont open
You can try this one, rated at 8A, pin to pin competable.

G2RL-2 DC5 Z3087-ND



http://www.digikey.ca/product-detail/en/G2RL-2%20DC5/Z3087-ND/1789837

BTW, I like your new logo ) .

Ian
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Old 10th October 2012, 11:35 PM   #1150
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Originally Posted by hochopeper View Post
I am just thinking out loud here, maybe there is value in a soft start for batteries? Maybe 2 relays and initial 5 seconds or so there is a resistor in series before it is switched out.

5A mechanical relay isn't going to last long with 60A+ short circuit from a LiFePO4 battery ...

Soft starting is a very good idea, especially for high current projects such as power amp PUS. Or, maybe a crazy IV stage in some cases . But that would be another design of high current version.

But please do not use soft start for the XO power, because most of digital applications need having clock running prior to other logics .

Ian
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Last edited by iancanada; 10th October 2012 at 11:49 PM.
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