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| Pico DC/DC 12V to ATX:: 160Watt at 15/30 euro?!? |
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| 0db:
--- Quote from: mariush on May 31, 2020, 05:05:01 pm ---The 12v on a boat may not be "clean", I suppose it could be up to 13.8v or whatever is the charging voltage. A HV (wide input range) picoPSU will regulate the 12v as well, but the output current on 12v will be fairly small, something like 10-20A or around 100w --- End quote --- Ah, ok. The 12V rail on the computer-side only needs 6A. It should be enough. |
| wizard69:
--- Quote from: 0db on May 31, 2020, 02:58:56 pm ---The input power is the 12V battery used on the boat. --- End quote --- If that is the case get a power supply specifically designed for use on automotive 12 VDC supplies. The reason is you can't pass the 12VDC through to sensitive electronics As has already been mentioned charging voltage are usually just under 14 volts which may be a problem on many motherboards. It actually can be a lot worse than 14 VDC due to power dumps, transients and so forth, that are common on cars or in this case boats. To put it another way the automotive DC system is not clean DC power. The age of the boat and its motor, plus the quality of the electronics used in it can also be factor. |
| Nominal Animal:
--- Quote from: wizard69 on May 31, 2020, 09:10:24 pm --- --- Quote from: 0db on May 31, 2020, 02:58:56 pm ---The input power is the 12V battery used on the boat. --- End quote --- If that is the case get a power supply specifically designed for use on automotive 12 VDC supplies. --- End quote --- Aw carp, I forgot about automotive environments. (Never dealt with those myself, always have nice clean power bricks myself.) The M3-ATX at CarTFT and elsewhere looks like a good candidate, although it's only 125W: 6A @ 3.3V, 6A @ 5V, maximum current at 12V depending on the battery voltage but for 11-16V, 6A @ 12V; all peak 8A for less than 30 seconds, with regulation to 1.5%. These have battery protection circuits (turn-off if battery voltage drops too low), transient suppression, and are supposed to deal with hard engine cranks (sagging voltage) etc. This particular model is PicoPSU-size, too. I'd say the PicoPSUs are good if you run them off a power brick or their own regulated 12V battery pack (a 12V UPS like things, with internal DC-DC conversion to a stable 12V). If the power comes directly from a 12V nominal battery, or the supply has other devices on it, especially if any kind of motor on it like a starter motor, the M3-ATX and similar are a much better choice obviously. |
| 0db:
--- Quote from: Nominal Animal on June 01, 2020, 05:26:54 am ---If the power comes directly from a 12V nominal battery, or the supply has other devices on it, especially if any kind of motor on it like a starter motor, the M3-ATX and similar are a much better choice obviously. --- End quote --- On boat, there is a DC/DC regulator probably with some extra filtering on the cabin where the 12V is used for the navigation system. and for the radio. Yesterday I measured 11.9V with 80mV of ripple with the motor off. And 12.2V with 120mV with the motor on. |
| Nominal Animal:
--- Quote from: 0db on June 01, 2020, 08:59:00 am --- --- Quote from: Nominal Animal on June 01, 2020, 05:26:54 am ---If the power comes directly from a 12V nominal battery, or the supply has other devices on it, especially if any kind of motor on it like a starter motor, the M3-ATX and similar are a much better choice obviously. --- End quote --- On boat, there is a DC/DC regulator probably with some extra filtering on the cabin where the 12V is used for the navigation system. and for the radio. --- End quote --- That's what I suspected. --- Quote from: 0db on June 01, 2020, 08:59:00 am ---Yesterday I measured 11.9V with 80mV of ripple with the motor off. And 12.2V with 120mV with the motor on. --- End quote --- The original ATX power supply specs require the +12V line to be between 11.4V and 12.6V, with max. 120mV ripple, and I think but am not sure that still applies to current ATX power supplies. In any case, I suggest you check the motherboard/PCIe card specs for their requirements. |
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