EEVblog #1298 - $70 2000W Power Supply

A look at the $70 Juntek 2000W power supply with wireless display.
Also the 3000W model, but does it have a problem?

#PowerSupply #Review #Teardown

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[MarkFunderburk]

Those higher voltages are starting to become common with stuff like drones and ebikes.

[mervynjack]

I found the title misleading. It's not a power "supply" really. It's a smart DC to DC voltage and current regulator. You still have to spend the big bucks on getting your mains rectified, isolated and dropped down. I suppose you could hook it up to batteries or solar cells, but it's still not the 'supply'.

[EEVblog]

Test, Youtube seems to erasing my own comments on this video.

[JuanJose-tnyd]

So, are you telling me i need a power supply to power the power supply ?

[rEdf]

I am a radio enthusiast who monitors VHF and shortwave bands. I have very mixed feelings on some these cheap, sometimes questionable build quality switch-mode transformers used in increasing numbers in modern electronics which are unfortunately known for strong excessive RFI (radio frequency interference) My LED computer monitor which likely uses a cheap 19 volt switch mode power adapter emits widespread interference throughout the entire shortwave band likely becoming a major issue if your a Ham radio operator or receive only listener. I do have a new somewhat pricy TekPower 30 amp swiching power supply I use with my CB radio and other low or high amp 12 volt gadgets. This supply specifically designed 2 way radio use also emits some RFI but does have a nifty noise offset to tune out any self made noises it generates, but cheap poorly designed power supplies are a growing issue to radio enthusiasts.

[tomwimmenhove]

They didn't mess up the "V" and "U". I.E U=42V in the same way that you'd write I=42A

[AndreyK]

Is the Thermocouple in a TO220 package at the end of the heatsink, flapping in the breeze, measuring the output air temperature?

[mcintoda]

As a cheap load you can take some coated magnet wire and dunk it in a bucket of water. I’ve done this with kW loads

[StrongOneX]

The erase of the part numbers on the chip, the markings look interesting, could it be done with a pulsed laser beam? Looks like little dots with some tiny overlapping.

[Rob]

It is a but unfortunate that these (and other similar) "power supplies" really are just DC-DC converters.
To have a lab power supply, it would be favorable when they had a 230V AC input and isolation.
I know I can order a separate fixed switchmode supply for 60V or similar but that kind of defeats the purpose of having a cheap lab power supply.
Hopefully one time they bring out boxes with AC input (and of course with the required safety).

[shengruizhang]

You can tell it is Chinese whenever there is a"technical parameters", seems like nobody can get this translate to the more common technical specifications

[Strawberrymaker]

The active chips look more "lasered" than "milled". You can see the individual circles by the laser

[srbuckles]

Higher voltages are useful for high end bldc motors and servos, they typically have flatter torque curves at higher voltages. 96v would come in handy as a cheap supply for anodizing titanium as well. I'll watch the rest of the video before I decide to I need to pick one of these up!

[gblargg]

19:30 Still not as bad as a Hakko soldering iron with digital interface. Two buttons.

[Sqeezerful]

3:30 e.g. stepper driver (CNC) are in this range

[Kris_M]

43:45 So it blows the hot air towards the caps? Nice!

[gamerpaddy]

the wireless modules are standard NRF24L01 2.4ghz modules

[phenyl]

At 23:00 one can see about 130-140 W on the R&S power supply, when 100 W are being pulled from the Juntek. That's << 92% efficiency...

[mikewillis]

Makes you wonder when a 105V input supply has a 100V rated capacitor across it/s input. I know they survive modest overload but that's not good practice surely?

[ruslanzalata]

Dave, please, test these two devices for max load. I understand that won't be easy, but possible. At least you can connect a number of your PSUs outputs in series to achieve higher voltage to supply DUT, then load it with some ballast resistor (nichrome wire wound). Thanks.