Test/Review of USB Load 4-13V 3A

6 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 2 days 9 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7423
Location: Copenhagen, Denmark
Test/Review of USB Load 4-13V 3A

USB Load 4-13V 3A
DSC_4375
Official specifications:


  • For the intelligent start and stop of fans, the temperature control is around 40 Celsius degrees.
  • Applicable voltage range: DC3.7V-13V
  • Current regulation range: 0.15A-3.00A
  • Continuous discharging with 15W

I bought from ebay dealer: wishyou-happy
DSC_4379
The two chips on this side is 5 volt regulators, probably one for the fan and one for the electronic.
The adjustment is a multiturn trimpot with a handle on it.
Above the text “POWER” is a red led.
DSC_4359
The load transistor is a NPN darlington transistor rated for 65 watt. The R025 is the resistor used to measure the current accross. The actual regulation is done by U2 (LM358 OpAmp), this also handles the temperature control and control Q0 that turns the fan on/off.
U1 is a reference used for the current measurement.
DSC_4360
DSC_4362
DSC_4364
DSC_4361 DSC_4363
Load testing


  • Current change during 30 minutes with 1A load at 5V is 0.015A, i.e. 1.5%
  • Current change during 30 minutes with 3A load at 5V is 0.029A, i.e. 0.9%
  • Maximum current is 3.06A
  • The adjustment is a multiturn pot.
  • The fan is audible, but not louad.
  • I did check for oscillations, but there was none.

USB%20load%204-13V%203A%20voltage%20sweep
The load is rated from 3.7 volt to 13 volt, the minimum voltage looks correct. The load is fairly stable over voltage, but there is a small change during startup (I did all curves from 13V to 0V).
USB%20load%204-13V%203A%20voltage%20sweep%20min
The minimum current is very low, because the fan turns off when the heatsink is cool, but it is not really stable enough to use. With the fan on minimum load is about 100mA.
USB%20load%204-13V%203A%20voltage%20sweep%20min%200.03A
A about 30mA load looks much better, for this to work temperature must be low enough not to start the fan.
USB%20load%204-13V%203A
The 3A trace is maximum power for the load, except for the initial drop it stays very stable.
Temp3108
M1: 43,7°C, M2: 40,6°C, HS1: 48,9°C
The fan keeps the temperature down, this is from the 1A test.
Temp3109
M1: 37,8°C, HS1: 45,6°C
Temp3110
M1: 43,6°C, HS1: 50,9°C
Temp3101
M1: 51,8°C, M2: 59,3°C, HS1: 80,5°C
With full power (15W/3A) the temperature is higher.
Temp3102
M1: 46,8°C, HS1: 66,2°C
Temp3103
M1: 62,6°C, HS1: 83,1°C
The transistor is not very hot for a transistor.
Temp3104
HS1: 65,5°C
Conclusion
This load works fine for testing normal usb outputs, but it cannot activate quick charge.
I like the current adjustment, it is easy to fine tune and it works without tools.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

dodge_911
dodge_911's picture
Offline
Last seen: 2 years 1 month ago
Joined: 02/18/2016 - 15:07
Posts: 219
Location: DodgeReviews HQ

I think I ordered one just like that last night, during a late night AliExpress spree, along with that other fancy one with the janky software download.
Figured I’d rather have that one burn out on me than my precious ZL1000 while doing ‘ordinary’ USB powerbank discharge tests Smile

:: YouTube ::
http://bit.ly/dodgereviewsyt
:: Discord ::
http://discord.gg/fqJEDyy
:: Join the Discord ::
we need more BLF'ers!
HKJ
HKJ's picture
Offline
Last seen: 2 days 9 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7423
Location: Copenhagen, Denmark
dodge_911 wrote:
Figured I’d rather have that one burn out on me than my precious ZL1000 while doing ‘ordinary’ USB powerbank discharge tests Smile

You are going to have some hard work ahead, if you want to burn this one out.
Over voltage will probably blow it easy enough, but over current, over power or over temperature is not going to happen (It protect itself).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

dodge_911
dodge_911's picture
Offline
Last seen: 2 years 1 month ago
Joined: 02/18/2016 - 15:07
Posts: 219
Location: DodgeReviews HQ
HKJ wrote:
dodge_911 wrote:
Figured I’d rather have that one burn out on me than my precious ZL1000 while doing ‘ordinary’ USB powerbank discharge tests Smile

You are going to have some hard work ahead, if you want to burn this one out.
Over voltage will probably blow it easy enough, but over current, over power or over temperature is not going to happen (It protect itself).


I sure do hope so… I find my ZL1000 gets awfully hot to the tough when testing 2A loads or more.
:: YouTube ::
http://bit.ly/dodgereviewsyt
:: Discord ::
http://discord.gg/fqJEDyy
:: Join the Discord ::
we need more BLF'ers!
HKJ
HKJ's picture
Offline
Last seen: 2 days 9 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7423
Location: Copenhagen, Denmark
dodge_911 wrote:
I sure do hope so… I find my ZL1000 gets awfully hot to the tough when testing 2A loads or more.

Hot to the touch it not really hot for power electronic. Usual power transistors can handle about 150°C inside, this will often translate to more than 100°C on the heatsink. Not something you want to touch.
Electrolytic capacitors do not like heat and in many designs this is a problem.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

dodge_911
dodge_911's picture
Offline
Last seen: 2 years 1 month ago
Joined: 02/18/2016 - 15:07
Posts: 219
Location: DodgeReviews HQ
HKJ wrote:
dodge_911 wrote:
I sure do hope so… I find my ZL1000 gets awfully hot to the tough when testing 2A loads or more.

Hot to the touch it not really hot for power electronic. Usual power transistors can handle about 150°C inside, this will often translate to more than 100°C on the heatsink. Not something you want to touch.
Electrolytic capacitors do not like heat and in many designs this is a problem.


Ah, thx for the info Smile
And, should it fail, I know who to send it to for a teardown Big Smile
:: YouTube ::
http://bit.ly/dodgereviewsyt
:: Discord ::
http://discord.gg/fqJEDyy
:: Join the Discord ::
we need more BLF'ers!