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Old 16th September 2019, 03:44 PM   #331
Salas is offline Salas  Greece
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Quote:
Originally Posted by dewdrop View Post
Just curious, what current will start to require bridge / chassis sinking?
Depends on the load's pattern of consumption too. How much stress it puts to the PSU's reservoir recharging process how often. A more helpful answer is when you have higher than 65C on the diodes, sink them.
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Old 16th September 2019, 04:00 PM   #332
dewdrop is offline dewdrop  Singapore
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As always, good insight!
__________________
Ed
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Old 18th September 2019, 06:56 PM   #333
jgsneves is offline jgsneves
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Hi, guys,
For years I have been using a powerbank to feed Raspeberry Pi, as I found sonic performance MUCH better than with its original wallwart power supply. But a friend of mine has been telling me this linear power supply gave his system much better performance comparing to battery or an ifi power supply.

I do not have knowledge about electronics, so I would like to make a question, if you can help me: I was wondering if I can feed this power supply with a battery (this one, for example: Cncool 12V 12000mah lithium battery Rechargeable DC battery polymer batteria For monitor motor LED light outdoor spare Battery-in Rechargeable Batteries from Consumer Electronics on Aliexpress.com | Alibaba Group). Possible?

Thanks,
Joćo
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Old 18th September 2019, 10:51 PM   #334
Salas is offline Salas  Greece
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Hi, you can skip using a power transformer and bridge diodes in this linear supply and feed DC directly to its reservoir capacitors from an external DC source like a battery bank. Thick not longer than necessary cables from battery to the pins of first big capacitor will do. Just watch the polarity.
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Old 19th September 2019, 12:37 PM   #335
jgsneves is offline jgsneves
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Thank you, Salas.


Do you think there is any advantage in this configuration with battery?
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Old 19th September 2019, 12:56 PM   #336
Salas is offline Salas  Greece
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Well, there will be no ripple to reject so theoretically its a plus. On the other hand the battery has to be recharged. Every time it goes down to 7.5V recharge it. Because 2.5V difference from DC input to DC output is the minimum good difference in this design.
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Old 19th September 2019, 01:33 PM   #337
jgsneves is offline jgsneves
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Sorry, Salas, but I dont understand: a 12v battery will not give 12v during all the time (95% charged or at just 10%)?


Thanks again.
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Old 19th September 2019, 01:47 PM   #338
Salas is offline Salas  Greece
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Exactly. Down to 7.5V battery state is acceptable for 5V output of L Adapter you will have to remember.
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Old 20th September 2019, 12:31 PM   #339
jgsneves is offline jgsneves
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Thanks again, Salas.
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Old 24th September 2019, 05:59 PM   #340
dtses is offline dtses
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Quote:
Originally Posted by Salas View Post
When you will double or triple the plate's surface area, plus it will be bolted to the chassis, the temperature should moderate a lot. Be generous with the plate's size. Because there are no fins.

There is a threshold in the sinking solutions after it they become saturated. When below that saturation threshold the temperature loses 10-15C kind of abruptly. Watch to have some top and bottom ventilation slots or holes in the final assembly.
what might be the optimal usage of case as a heatsink here?

1. Attach diodes and Q2 to inner sides? Forget about aluminum plate.
2. Attach them to 1cm aluminum plate and then screw it to the bottom lid?
3. Some better option?

case is 28 x 13 x 4 cm; aluminum plate is 12 x 10 x 1 cm
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