What is main difference between these PSU

G

Giorgi3

Newbie level 4
Joined
Jan 16, 2024
Messages
7
Helped
0
Reputation
0
Reaction score
1
Trophy points
3
Visit site
Activity points
49
Hello, i should buy it from china laptop power supplies these are 3 Grades GRADE AA GRADE A and STANDARD im interested what is main difference between these grades
here is photos of power supplies
im not electrican, please exmplain in my language which i should buy there are differences in price



 

Sort by date Sort by votes
I think this a mostly a marketing ploy, the actual difference will be almost zero.
The standard one on the left has a small 68uF reservoir capacitor, the middle one has a larger 68uF capacitor and the 'AA' on the right has a 100uF capacitor, I can't see any other differences. As these components are before the regulation system their values would make little difference.

Brian.
 
Upvote 1 Downvote
Thank you so much for reply

Left is AA grade Right Standard there was 0.5$ difference in price
diller says AA was better quality
on pictures AA have more parts on board than left
what difference they give ?
they defend laptop from damage if power supply was damaged ?
 

Upvote 0 Downvote
Hi,
Giorgi3 said:
what difference they give ?
they defend laptop from damage if power supply was damaged ?
Click to expand...

they differ just in the primary (input) circuit.

The difference may be
* HF noise filtering to grid (bot directions)
* improving power factor.

The modifications have almost zero effect on output voltage, nor on laptop protection.

Klaus
 
Upvote 0 Downvote
KlausST said:
Hi,


they differ just in the primary (input) circuit.

The difference may be
* HF noise filtering to grid (bot directions)
* improving power factor.

The modifications have almost zero effect on output voltage, nor on laptop protection.

Klaus
Click to expand...

Thank you so much <3 how can they harm laptop, if they will broke or bad?
 

Upvote 0 Downvote
They will be as reliable and safe as any other power supply. If you are using one of these to power your laptop make sure the voltage is correct and check whether your laptop needs an extra output to recharge the battery. Some laptops have the charger built in, some need a second output from the power supply .

Brian.
 
Upvote 0 Downvote
thanks, i was choosing them for customers i want buy 300-500pc and sell it
 
Upvote 0 Downvote
Giorgi3 said:
Thank you so much <3 how can they harm laptop, if they will broke or bad?
Click to expand...
Who or where does it say they will harm the laptop?
We did never discuss about broke or bad parts before.

I did not say so. And I even can´t confirm this statement. Neither they will harm nor that they will not.

Klaus
 
Upvote 0 Downvote
KlausST said:
Who or where does it say they will harm the laptop?
We did never discuss about broke or bad parts before.

I did not say so. And I even can´t confirm this statement. Neither they will harm nor that they will not.

Klaus
Click to expand...
no you not say that. i just asking can they harm laptop ?
 

Upvote 0 Downvote
medical grade has better insulation filtering , leakage, maybe? lower CM noise, with CM choke added to input. (get this)

Medical Grade Power Supplies Archives

Sunpower’s selection of medical power supply units are versatile products, capable of handling a large range of non-patient/patient connect applications, IT equipment and general electronic use within a medical environment. This premium range of medical power supply units are available as...
www.sunpower-uk.com
 

Upvote 0 Downvote
Read #10 again. There is a difference if you prefer medical standards for leakage current to earth gnd when you have damp feet or sensitive electrodes on and lower EMI using the CM choke and X caps.

Compliance to UL60601-1 & TUV EN60601-1 medical standards is the difference.

Why do you want to buy these? Will you install them in a protected place since it is open-frame and has exposed high voltages.

However since Laptop chargers are usually 19V and enclosed , they tend to run hotter but for shorter periods than closed frame supplies which can be more reliable. Heat reduces lifetime.


 
Last edited:

Upvote 0 Downvote
i want buy them 1000+ for sell
 

Upvote 0 Downvote
R
ight, agree with you, just marketing issue and differences, as all are smps circuit
 

Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…