Need help for diy ups project

Status
Not open for further replies.
P

Painhtut3

New Member
Hello . I’m novice learner in electronic. Currently I’m assembling diy ups project like this diagram. But I have one problem while switching main power and backup power . That is switching delay . When main power from smps fail , the MOSFET turn the battery output on but during switching Between battery and power supply There’s a switching delay that make my 12V 1.5 A onu router restart. My question here is how to eliminate that ? I don’t want connection loss for a moment during power outage. Any suggestion, help , ideal will be appreciated
 
Last edited:
Sort by date Sort by votes
SMPS - which / where?
MOSFET - where?

You will have to describe your setup a little more for us to understand the problem.
And your schematic is too small to read the component values.
 
Upvote 0 Downvote
Ramussons said:
SMPS - which / where?
MOSFET - where?

You will have to describe your setup a little more for us to understand the problem.
And your schematic is too small to read the component values.
Click to expand...
Ramussons said:
SMPS - which / where?
MOSFET - where?

You will have to describe your setup a little more for us to understand the problem.
And your schematic is too small to read the component values.
Click to expand...
SMPS = I use 12 v 5A supply to powering the router and charging the battery pack
MOSFET =IRF9540N between the battery output and boost converter input and the gate terminal is connected to adapter positive terminal . Does it clear or need more info?
 
Upvote 0 Downvote
Painhtut3 said:
SMPS = I use 12 v 5A supply to powering the router and charging the battery pack
MOSFET =IRF9540N between the battery output and boost converter input and the gate terminal is connected to adapter positive terminal . Does it clear or need more info?
Click to expand...
The circuit diagram in your first post it too small to see clearly, so the more information needed is a readable version of that.
 
Upvote 0 Downvote
Why don't you just use a diode in place of the FET? As long as external power is on, no current will be drawn from the battery.

Note that the battery control board you picture is NOT a charge controller, it is purely under/over voltage protection and balance module. (Plus short-circuit protection).

You need an accurately regulated and current limited supply to charge the battery safely.

This is a setup I use with a similar BMS board and 3S2P battery pack, after the 15 - 20V power source:

 
Upvote 0 Downvote
As already said, the circuit drawing in your first post is to small to be usable.

But before you post a larger version of the same. please make the following changes:
  1. All components should have designators. This will make it much easier for members to accurately comment on your circuit. For example, Diodes D1, D2, etc. Modules M1, M2 etc. Fuse F1. Resistor R1. Connectors J1, J2, etc.
  2. The top left module doesn't have a label. It may be the same as the top right module, but guessing leads to errors. All components should have labels.
  3. It would also help if you provide details/links for the modules you are using.
 
Upvote 0 Downvote
Nigel Goodwin said:
It is, thanks for that - and as has been pointed out, you don't have a charger in the circuit.
Click to expand...
It has . I use 12V 5A adapter to power this entire circuit and charged the battery through the upper left xl4015 buck converter . And the problem here is not the charging . the problem is with the mosfet switch time because of that the router restart when primary power source fail.
 
Upvote 0 Downvote

That's NOT a charger, it's just a power supply - Li-Ion are critical about charging conditions, and can burst in to flames if not charged correctly. While that can be set to CV and CC, there's no shut off when it's fully charged.

But as for switching, why the FET at all? - just a simple diode is all that's needed - no switching involved.
 
Upvote 0 Downvote
 
Upvote 0 Downvote
Charging process is mainly handle by xl4015 Step down charger and bms , Ive never faced over charged and discharge issue .
You talk about placing diode instead of FET . How and which ? Can u explain a little bit?
 
Upvote 0 Downvote
Charging process is mainly handle by xl4015 Step down charger and bms , Ive never faced over charged and discharge issue .
You talk about placing diode instead of FET . How and which ? Can u explain a little bit?
 
Upvote 0 Downvote
Painhtut3 said:
Charging process is mainly handle by xl4015 Step down charger and bms , Ive never faced over charged and discharge issue .
You talk about placing diode instead of FET . How and which ? Can u explain a little bit?
Click to expand...

You've already got a diode there, just remove the FET and replace it with a piece of wire, drain to source.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

N
  • Question
Need Help Finding this Mic
Replies
17
Views
556
ZipZapOuch
N
  • Question
Need Help Finding a Part
Replies
2
Views
356
NBD925
N
T
  • Question
Need help with RS232 wiring
Replies
18
Views
850
For The Popcorn
F
G
  • Question
Need help - Filter FIR
Replies
9
Views
571
danadak
M
  • Question
36v ac to 115v ac transformer for welding torch
Replies
4
Views
2K
Matthewirl
M
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…