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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th April 2010, 01:55 PM   #41
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It is likely that the charger would be in a current-limited mode when you first connected it, as the batteries would be trying to take more current than the charger could supply. Normally the charger would change from a current-limited mode to a constant-voltage mode as the batteries charged up. 30V is too high to leave connected to the batteries once they have charged up. More advanced chargers alter the float-charge voltage depending on the battery temperature, but for a normal charger, anything over 28V (for a 24V SLA battery) is too high to leave connected as a float charger.

When I'm charging a 24V battery pack from a bench PSU, I set the PSU to 27.6V and monitor the battery current. Once the current taken from the PSU by the battery pack has dropped below 50mA (for 7A-H or 12 A-H batteries) then it is effectively fully charged and can be disconnected.
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Old 27th April 2010, 02:01 PM   #42
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The charger has two lights, one of them should become green when charged, and might start acting as a float charger then. So you're saying 30V during charging is ok?

Any advice about the buzz sound?
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Old 27th April 2010, 02:14 PM   #43
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Well, 30v is still higher than I would use! I have a Chinese-made 24V charger myself, intended for charging the 24V battery pack in an electric scooter, so it really is meant to charge batteries of 17 amp-hours or so. If the 30V supply is connected for too long it will cause excess pressure and temperature in the smaller 7 amp-hour batteries. Perhaps you could leave the charger connected until the green light comes on and see what the charger voltage does.

Does the charger buzz all the time, or only when it is current limiting? Is the charger a switch-mode type (looks like a laptop PSU), or is it a traditional mains-transformer type? Either way, a 50Hz or possibly 100Hz buzz isn't surprising. Is there a current rating on the charger? I guess it will only need to be connected for 3 or 4 hours to fully charge the batteries, so the buzz might not be too much of a problem.
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Old 27th April 2010, 02:21 PM   #44
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The charger is light, but larger than a laptup type, about 8cm high and 15-20cm long, so probably not a transformer type. The buzz is all the time, I havn't gotton to the float charger stage yet. will try to reach the green light and see what voltage it show then.

Last edited by Nick122147; 27th April 2010 at 02:26 PM.
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Old 27th April 2010, 03:40 PM   #45
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This is the sort of Chinese 24V charger I have, which seems to work ok with 7 A-H or 12 A-H batteries.
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Old 27th April 2010, 04:03 PM   #46
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Quote:
Originally Posted by Ouroboros View Post
This is the sort of Chinese 24V charger I have, which seems to work ok with 7 A-H or 12 A-H batteries.
Is yours completely silent, any noise at all?
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Old 27th April 2010, 04:50 PM   #47
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EDIT: FWIW: I've been using the TK2050 sure board with 8800mAh 22.2v Li-ion cells outside and in other places without a mains supply and it sounds very nice.
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Originally Posted by sendler View Post
You can try the lower value Wurth coils with the stock caps no problem. Then if you want, it will be easy to add the differential cap across the speaker outs as a mod. I use this filter with 3.5uH coils but 4.7uH has less out of band peaking and sounds really good.
The 4.7uH XXL's have been out of stock for months at Farnell, would you say there us much difference with the 6.8uH XXL's as they have plenty of 6.8uH XXL's in stock?

Last edited by MikeHunt79; 27th April 2010 at 05:10 PM.
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Old 27th April 2010, 05:22 PM   #48
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Quote:
Originally Posted by MikeHunt79 View Post
EDIT: FWIW: I've been using the TK2050 sure board with 8800mAh 22.2v Li-ion cells outside and in other places without a mains supply and it sounds very nice.

The 4.7uH XXL's have been out of stock for months at Farnell, would you say there us much difference with the 6.8uH XXL's as they have plenty of 6.8uH XXL's in stock?
Check the WE-PD XXL coils at 4.7uH again. Someone else just got some. If not, the 6.8 will sound much better than the stock coils.
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Old 27th April 2010, 09:05 PM   #49
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Quote:
Originally Posted by Nick122147
You connected them + to + and - to - for charge in paralell with 24V charger. So have to reconnect + to - for listening at 24V. I bit too much hassle for everyday use once the initual please of getting some new stuff decreases.
I follow how to wire up both scenarios individually. Id rather not
have to change wiring in between sessions. I have a pie in the sky dream of a more elegant arrangement that can do either at the flip of a switch. I just don't know how to do it...
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Old 28th April 2010, 03:43 AM   #50
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Originally Posted by Svendingo View Post
I follow how to wire up both scenarios individually. Id rather not
have to change wiring in between sessions. I have a pie in the sky dream of a more elegant arrangement that can do either at the flip of a switch. I just don't know how to do it...
I see I wrote 24V instead of 12V, it should of course be: connect + to + and - to - to charge with 12V charger !
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