All Questions
Tagged with current-limiting power-supply
82
questions
6
votes
1
answer
3k
views
LED strip hot / drawing more current than expected
I am trying to wire some LED strips but they are getting a lot hotter than expected. I have noticed that they are also drawing much more current than expected. I am going to show what I've measure ...
- 63
0
votes
2
answers
104
views
Calculation of max possible current load from voltage multiplier connected to PSU 12V rail [closed]
today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
- 143
0
votes
1
answer
171
views
LED current source safety margin
I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts ...
- 783
1
vote
1
answer
803
views
How to limit current while almost keeping voltage same
I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
3
votes
1
answer
586
views
Combining non-isolated switch mode power supplies in parallel into a single supply
I'm trying to combine several SMPSs each having a ~350VDC output @100mA each.
Background:
Purchased an unused batch of small DC->DC SMPSs in good industrial quality. Unfortunately they're too weak ...
- 31
1
vote
4
answers
4k
views
Understanding DALI power supply
I am working on a DALI system and I came across this schematic for the DALI power supply in a Microchip app note AN1465:
It says the power line can be 12-20 Volts but the current has to be limited to ...
- 8,361
0
votes
2
answers
394
views
Trying to come up with a overvoltage overcurrent reverse polarity protection circuit, is option 3 done right?
I´m reading for the past week about P-Channel mosfet reverse polarity protection circuits.
Then I´ve found this post
http://kaktuscircuits.blogspot.com/2014/07/reverse-polarity-and-overvoltage.html
...
- 111
0
votes
1
answer
766
views
Raspberry Pi Zero - 5 VDC output current?
I was planing on using a Raspberry Pi Zero W for a smart lamp project with WS2812b LEDs.
To avoid needing a separate power supply for the LEDs, my plan was to power the LEDs from the +5 VDC on the RPI ...
- 697
1
vote
1
answer
4k
views
What to consider when powering multiple devices in parallel?
Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
- 23
0
votes
0
answers
45
views
TPS562208DDCT current problem
I have attached a PSU design which I have created. The input voltage is between 12 and 24V DC.
The first stage creates an isolated output voltage of 7V that is then fed into the two TPS562208DDCT (...
- 51
1
vote
1
answer
3k
views
Limiting current to 20A with 48V in
I'm an electronics newbie and I need some help/advice with a project.
So basically I need to make a sort of programmable power supply module (or at least that's what I think I gotta do). I got a DC ...
- 13
0
votes
1
answer
100
views
Why does the high Side Current Shunt monitor fault as soon as power is on
The high side current shunt monitor fault goes high as soon as power is turned on preventing the P-MOSFET from turning on, its not faulting because of over current but as soon as the Enable signal ...
- 45
1
vote
3
answers
2k
views
Series inductor to limit motor current?
Short question: Would it be possible to use a series inductor to limit the inrush current when switching on (or briefly loading) a DC motor?
Longer question: I have a battery-powered motorized toy ...
- 13
1
vote
1
answer
72
views
How to limit current on parallel outputs from a power supply?
So I am trying to make a USB power dock for multiple devices. I have a 5v 20A power supply.
If I connect 10 USB ports in parallel, is there a way to cap their current to 5v 2A?
I don't want to fry my ...
- 41
1
vote
0
answers
169
views
Theory of Operation for Arc Lamp
I am attempting to power an arc lamp (which I have) using a programmable power supply (which I have yet to source.) Though the lamp is rated at 1000w (37v at 27A) I would like to power it at about ...
- 111