L.P. Alpha DC power experiments and observations

userHead ccs_hello 2018-10-14 11:13:20 20627 Views30 Replies
I tried powering LP Alpha 864 using type-C port, thru
1) included 45W type-C PD 3.0 power supply, or
2) Apple 60W type-C power supply (also USB PD 3.0)
Both works fine. What I've found using a type-C USB power meter is:
it's not using QC2, QC3, BC 1.2, Android DCP, etc. and definitely not using the classic D+ D- signaling. Also, tried these type of power supplies as well as battery charging packs (e.g., QC3 type), they won't work.
It is using PD and negotiated to 15V output profile (using type-C's CC1 and CC2 pins' communication protocol.)

In the stock, unactivated Win10 Pro environment, power consumption seldom went higher than 16W. (Also as low as 6W.)
Note the system is not under load, except one USB keyboard and one USB mouse connected.

2019-07-29 19:58:15 @ ender re: Surface Pro

This is not a forum to address non Latte Panda products. Your question is better asked in AMZ product's Q&A section.
userHeadPic ccs_hello
2019-07-29 13:13:03 I think the Surface Pro 6 will run the adapter, right?

https://www.amazon.com/Batpower-Charger ... pons&psc=1
userHeadPic ender
2019-04-28 06:19:55 Thanks ccs_hello! userHeadPic Knightshadow1371
2019-04-27 06:09:24 Get the electrolytic capacitor(s) from the kit
https://www.amazon.com/WINGONEER-Electr ... 0734T3GJ9/

Ebay is also fine
https://www.ebay.com/itm/2200uf-25v-Cap ... 2432042234

Xbox 360 Slim Power Supply, YCCSKY AC Adapter (12V 10.83A) is very nice.
userHeadPic ccs_hello
2019-04-27 01:17:15 Great, thanks ccs_hello!

I will take that into account. Someone in a different post posted a link where a guy used a xbox 360 power brick, I think it was 100W. It's not bad to have too many watts even if they aren't being used?

What about the capacitor, you recomend were you got yours?
userHeadPic Knightshadow1371
2019-04-26 21:56:53 36W is okayish to supply power just to LP Alpha (assuming not many attached peripherals/power-hungry fire-breathing NVMe SSDs (just kidding...)
I.e., power budget for a flexible platform like LPA is very hard to give a concrete number.

Re: eGPU usage
eGPU definitely needs a separate power budget calculation.
Some low end graphics card can easily consume 90W, while a top-end can burn 500W easily.
userHeadPic ccs_hello
2019-04-26 21:40:13
ccs_hello wrote: ↑Sun Jan 13, 2019 9:31 pm I used Apple 61W type-C power adapter MNF72LL/A and a quality USB-C cable (male type-C to male type-C on both ends.)
<-- this type is designed for MacBook Pro


This power supply should be reasonable? I know the voltage and amps are good. I just want to know if 36W is enough for the lattepanda with an attached external GPU.

https://www.amazon.com/gp/product/B07HN ... UTF8&psc=1

And where can I find one of those compacitors you mentioned earlier In this post? Or Dobie not need one?

"I also connected a 2200uF 16V electrolytic capacitor on the USB end to take care of instantaneous power bursty needs"

userHeadPic Knightshadow1371
2019-04-26 21:23:19
nyteshade wrote: ↑Mon Jan 14, 2019 6:04 am Thanks for your reply. Have any attempts been made to use some USB-C hub that allows high voltage charging in an effort to use the usb-c port for display port as well?
Did you ever find a reasonable USB-C hub with power pass through and a extra USB-C port that has display capability?
userHeadPic Knightshadow1371
2019-01-14 22:43:14 Pls search forum posts. There was a discussion one brand of such "USB-C display port cable with power injection" work and another brand did not. Vaguely recall the one works has the "Amazon Recommended" tag on such item. However, search for the post first. userHeadPic ccs_hello
2019-01-14 14:04:59 Thanks for your reply. Have any attempts been made to use some USB-C hub that allows high voltage charging in an effort to use the usb-c port for display port as well? userHeadPic nyteshade
2019-01-14 05:31:56 I used Apple 61W type-C power adapter MNF72LL/A and a quality USB-C cable (male type-C to male type-C on both ends.)
<-- this type is designed for MacBook Pro
userHeadPic ccs_hello
2019-01-14 02:20:11 So to be clear, before I go and ruin my new LP Alpha, I should be safe to plugin Apple type-C power supplies (which provide far more power in general than the supplies provided by LP) and the device will only use what it needs? userHeadPic nyteshade
2019-01-05 10:41:38 There is no 9900mAH 18650 cell. That rating is fake. At best, it's 2500mAh or even less.
My LP Alpha with light load will consume 8-10Watts with an eDP LCD panel also powered. Highest peaking, I would guestimate it's about 30 Watts or less.
So let's take a mid-point: 15 Watts.

Assuming your 18650 battery each cell is 2000 mAh, so your 7P 3S battery will have approx 3.7 x 2 (7.4 Watt-hour) per cell.
21 of them will be 155 Watt-Hour total.
Divide that 155 WH with 15 W will be 10 hour approx.

BTW, please note although typical BMS on Li-Ion will shut it down at 3.2V terminal voltage (3S will be 9.6V),
however, LP Alpha (if using that 4-pin DC power IN connector) will shut itself down at 10V. (In between 10 and 10.5V is marginal.)
Thus the battery will not reach its full-drain protection of 3.2V set by BMS but stopped by LP Alpha at 3.3V. I.e., not all energy can be utilized.

I don't have info on the proprietary 10-pin 2S battery-pack connector.
userHeadPic ccs_hello
2019-01-05 07:11:40 Good day, can you help me with my proyect, i have 21 (18650) in a 3S array, with a protection charging circuit. Each battery is rated 9900 mAh. And is marked 3.7V. Im not a electrician or engenier. Do you know how long will this setup supply power? Thanks. userHeadPic sutam1
2018-12-17 11:00:34 I do not know the store
1 wire 5.0 mm
1 wire 2.54 mm
Finally, those two are not sad at all.

Do not know if you can supply a 2pin (red, black) cable?
userHeadPic vnlevanduoc
2018-12-17 04:19:58 Yours seems to be too large. It's 2.0mm pitch. JST-PH2.jpg JST-PH2.jpg (1.92 KiB) Viewed 4155 times



userHeadPic ccs_hello
2018-12-16 19:44:19 Can I ask you something


I bought a Cable Cap. Https://banlinhkien.vn/goods-10715-bo-d ... -0580.html

Is it right?
userHeadPic vnlevanduoc
2018-10-25 22:27:21 Worthwhile to mention that when the rechargable battery is in its tailing end of discharge cycle, the rated capability will have to be derated. For example, a 2C Li-Ion 18650 cell when battery's terminal voltage is fairly low (say 3.5V <-- Li-Ion is 3.7V nominal) and a heavy load is demanded (especially instantaneously such as CPU bursting or UPS switch-over), the battery voltage may drop significantly.
Please note for any of these SBCs, the end-result will be CPU freeze or shutdown (black screen.) It is not: SBC senses insufficient power supply thus throttling down. <-- I wish that is the case but not the reality
userHeadPic ccs_hello
2018-10-25 19:40:04 It is critical that power system is planned correctly:
connector(s), wire thickness, (I always add) large filter capacitor serving as the reservoir for CPU bursting (or UPS switches over/switches back), and quality switching power supply module.

With that said, yes, 10.5V in my case, works fine. <-- caveat: I am not a gamer nor an extreme overclocker/benchmark pusher/tweak scenario TDP/etc. etc.

I've used many SBC, mini PC, etc. and have found the make/break factor has been adding the large DC power feed capacitor (min. 2200uFD, larger is even better.) It adds the stability to the system.

For a system mainly based on battery pack, additional factors will be at play as well (BMS used, max discharge, capability power paths, etc.)
userHeadPic ccs_hello