KUAIQU Programmable Switch Mode Power Supply [*SPPS-D3010-232 32v-10.2A/325W]

[DaneLaw]

Received this unit yesterday, and curious if anybody has any experience with these..?

 
Was looking for a new programable PS with a current ability up to 10A as it's far from ideal to put my two individual Korad linear PSUs (KA3003P & KD3005P) into parallel.
I was looking into either a barebone switchmode AC to DC module, and hooking it up with a display DC controller, or getting one of these cheaper OEM bench PSU that are coming out of China in bulk at relatively low prices and seem quite popular amongst EEVblog-users.

Some of the criteria that I was prioritizing' which could be a hurdle to obtain when pursuing a programable switchmode power supply in the very lower-end price bracket
=
* Graphical interface (important)  no 7-segment display, I wanna be able to see my settings & secondary adjustments, and constantly maintain an overview of my V/A values and also the adjustments.. -http://tinyurl.com/3yeyvscv
* Translucent buttons to highlight when things & settings are active.
* Rotary clickable interface dial for control of segments/digits.
* Protruding binding posts, perhaps with cable feed-thru-holes - i'm not a fan of the 4mm safety input EU jacks, that I got on one of my Korads (KD3005P).
* Temp fan control, in the small hope it's done well, and the fan will stay off when there is no heavy drain. (important)
* Relative small & compact, and easy to move around and put away and take advantage of one of the main benefits of SMPS tech.
* Front on/off AC switch, so it doesn't stay in some semi-standby mode with a soft sw shutdown, and waste electricity.
* Relative low price = a no-name OEM unit
* Decent 4mm binding posts that deliver firm tight fit with different kinds of 4mm banana jacks, - quite vital with high-current that the connection is loyal, not flimsy.

Secondaries - not that relevant.
* Western stock, so it doesn't take months to arrive but in a few days. (though a minor thing' as often it is simply not possible)
* PC /RS232 interface for fx PC software and perhaps third-party interface ability.

With these quite specific criteria, most of the cheaper PSU models to 50 to 65 bucks (incl. 25%EUVAT) were out of the picture.

I stumped upon a model under the mouthful-name "KUAIQU"  that matches many of the criteria that I was prioritizing, and the backland even had stock in Europe (Poland or Spain inventory) so took a chance on that unit  - it arrived yesterday (Thursday) to DK from Poland - an order made on Sunday, so merely around 4 days, impressive delivery time for items with stock in Europe.

The price with delivery was around 80 Euro/86US in total (incl a 7 euro shipping fee from PL to DK), so quite a bit more than the cheapest versions of these Chinese 30v/10A SMPS's, but the fast delivery is a joy - as otherwise, it would have taken a month or two, as China is more less closed down for most of the month with their Lunar New Year holiday.... bummer, got a newly released NUMB12-22W RGB lazing microarray from Nichia on the backburner that sadly wasn't shipped before China went down under.

First impressions of the bench KUAIQU-SMPS 32v/10A are positive, it weighs around 1.35kg (13x22x12cm) and the outer build is stamped sheet metal all around, with a plastic front.(like most units) the fan seems temperature-smart based and sofar doesn't turn on at all even when pumping above 10A and over 100W into these 50W & 100W blocked yellow resistors but it's only for like 20 to 30 seconds until the resistors simply get too hot.

Will try the 420W electronic East tester sink-load tomorrow on this 325Watt switching supply, so I at least can hear how the fan sounds (if it works) but the OEM vendor does emphasize on their homepage that it's a "smart fan" in this new series, though it likely says more about the generally low standard of this OEM NP-vendor's massive portfolio of cheap Chinese SMPS's if the norm is a steady always-on fan.

[DaneLaw]

User-Manual, and a few crude no-load voltage steps which more or less stays in line with HT208D CM.. (around +50 / 60mV at 32v)

Buttondial changed.

Tolerances / Manual..

[DavidAlfa]

Now connect a scope and see the 200mVpp switching noise of those chinese PSUs

[DaneLaw]

Now connect a scope and see the 200mVpp switching noise of those chinese PSUs

That's the name of the game with these..  if one can't tolerate switching noise, then don't get a switching mode power supply, and certainly not a cheap Chinese one.
As indicated above, I do have a couple of linear bench power supplies, but they are obviously cumbersome & big - and for certain of my use cases, not what I need.

Also got a few extremely small power supplies (10x7x2cm)  I do love the size and how manageable they are to just pull out wherever you prefer and fiddle with things..
I run them with PD3.1 powerbanks (28v5A/140W) obtained with a PD 3.1 chip-decoy as only PD3.0 20v5A/100W are natively supported in these small PSUs that were under 45 euros at the BF sale.
Have certain usecases, where I need a current ability well above 5A and none of the other fits the bill - time will tell if the above [32v10.2A/325W SMPS] will be up to the task.. _extensive switching noise' or not.   

KA3003P/KD3005P

Sub 5A aint gonna cut it.  (CC)

[DaneLaw]

Been trying to get some life-signs out of the fan in this unit to see that it's actually on duty, but sofar no dice. (It does spin for a fraction of a sec when powering on, so that seems correct)

Tried with 85watt for 35 minutes, and 320watt for a handful of minutes to an East Tester sink load, but no fanning, its dead-silent, - the casing peaks at around 36 degrees but mostly around 30 to 33 degrees.
When pooking through the went-holes with a thermal camera, there are what look to be resistors, reading around 75 degrees on the board.
the product's promo material does indicate that it needs to be above 50 degrees before their so-called "smart fan" starts up.
The power supply is completely silent, even at heavy current loads.
It consumes 3 watts when its "ON"  with display running.

One thing, I do appreciate is the big bold purple_lettering "OFF" in the WATT area, when no output is active, even though you also got all the other indicators like a well-lit translucent "output button", alongside a worded symbol-area just below the V/A limited values in the lower part of the display - I do find the highlighted "OFF" across the screen ideal, as its very visual.

Its max is around 326Watts (32v/10.2A)

The display will activate a menu, when holding the dial button in for a few seconds, with "ADR001" unsure what that is? the manual does not specify anything about it.
You can use the dial to adjust the value, and when dial-clicking it will jump the next digit so easy to adjust, the limits seem to be "ADR512"
 - any idea what that could relate to?  Perhaps some interface address-control if you have many of these, fx in a production facility as there are also revisions in this product line with RS485 back, and this unit that got RS232/USB.

It seems they are making this model in four other HV-revisions [*1000v1A] - [*400v1A] - [*300v1A] - [*200v1A] and the lower voltage revisions [*120v3A] - [*30v10A] -  [*60v5A] -  [*30v5A] and they exist in 2 color choices, black & white.
It looks to be a relatively new model-line, - will try to see if I can get the PC software to play along, but it can often be a driver-nightmare for these no-name Chinese products when it comes to their software.

The graphical screen interface is definitely a step up versus the 7-segmented units, it looks good, but also worth noting that it does look better on some of these pictures above from the low exposure, than in real life, where there is more backlight blooming. (picture8 in post #1 is more adequate)

[DaneLaw]

Inside the unit..

   

* click for higher resolution

[DaneLaw]

What's the normal temperature of an NTC-5D15 thermistor in an SMPSU like the one above, when in use.?

With a constant load at around 216watt (27v 8A) into an electronic load (ET5410) around 90 to 95 degrees after a few minutes of runtime, where it seems to settle/cycle.
it looks like the board was optimized for two but this model-line also exists in 1000W variants, so the dual board footprint could be for other units.
https://datasheetspdf.com/pdf-file/815051/EXSENSE/NTC-5D15/1

[Hydron]

90-95C isn't surprising for an inrush limiting NTC - these things have to get hot in steady-state to actually work.

Any chance of some scope shots of switching noise, overshoot etc? Am interested in one of these and while I'm of course not going to be buying expecting no switching noise, there's acceptable and then there's outrageous - my last attempt to buy something similar had >0.5Vpp of switching noise, a very loud fan and some smoking hot (>>100C) snubber resistors, so it went back to amazon.

Thanks for the pics and post so far.

[DaneLaw]

90-95C isn't surprising for an inrush limiting NTC - these things have to get hot in steady-state to actually work.

Any chance of some scope shots of switching noise, overshoot etc? Am interested in one of these and while I'm of course not going to be buying expecting no switching noise, there's acceptable and then there's outrageous - my last attempt to buy something similar had >0.5Vpp of switching noise, a very loud fan and some smoking hot (>>100C) snubber resistors, so it went back to amazon.

Thanks for the pics and post so far.

Yes,  90 to 95C does seem to fall in line with the temperature span & resistance graphs I see online - the unit seems to settle between 90 to 98 degrees.

The fans are very passive to the point that I had to use a hairdryer to elevate the temperature on the main backplate/heatsink for the fan to wake up..
The fan got a pleasant healthy woosh & stopped in under ½ sec after moving the hairdryer..
I started to wonder if the tempsensor, had lifted from the heatsink plate as the thermal grease is very wet (fresh) but it does look like it's thermal glued and then a minor bath in thermal grease, the same thermal paste/grease as under the fets, that is also very sticky/wet.
It's a very silent SMPS.
It does look to have a relative amount of switching noise when under load, will try to take some measurements.