All Questions
Tagged with ac-dc power-supply
140
questions
3
votes
2
answers
1k
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Is this circuit safe to put in my ceiling? What improvements could I make?
I uploaded a picture, is there a better way for me to share the circuit?
The addressable LEDs use up to 100 mA at 5 V, that is why I am using three 5 V power supplies in parallel, each offering 600 mA....
- 31
3
votes
1
answer
73
views
What are these resistors used in this flyback converter?
I'm new to designing flyback converters. I noticed resistors connecting the primary and auxillary coils. Can somebody explain the usage of these resistors for me.
The IC in this schematic is a CR1510. ...
- 31
0
votes
1
answer
74
views
Calculating input power of ACDC power supply
I'm trying to calculate the input power draw of an ACDC power supply that we are using in a control chassis and am confused by what to me looks like conflicting information in the datasheet.
The power ...
- 156
0
votes
2
answers
157
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Is there a 3-phase to DC converter that draws current proportional to voltage?
Of course, 3-phase alternating current can be converted into a rippling direct current with a 3-phase bridge rectifier.
This design only draws current from the two phases with the most voltage ...
- 443
5
votes
2
answers
2k
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Which power source is good for my project?
I want to create an inverter LED light source. I would be using 2 COB LED lights rated at 4 volt DC, 8 watt. My idea is that when the phase is connected, I want the light to glow and at the same time ...
user357345
0
votes
2
answers
103
views
AC and DC inputs to a Power Supply
I am studying about power supplies and I need some help with the following. I have a power supply with a 12 V DC output to power the lower power controller electronics. This power supply has two ...
0
votes
3
answers
152
views
How are modern ACDC power supplies desgined?
I wonder about how exactly modern, but mundane ACDC power supplies (your phone power supply) are designed. Maybe my misunderstanding comes from one of the following assumptions:
Modern AC-DCs ...
- 175
1
vote
0
answers
78
views
Best placement of bridge rectifier to allow DC/DC convertor to become AC/DC convertor. Does this inhibit surge and EMI performance?
I am trying to use the power supply: CQB50W12-72S12 with AC power without degrading the performance of its recommended filter and surge components. 120VAC peak voltage is 169V and I am worried that ...
user298907
1
vote
1
answer
53
views
UL ratings and power supplies (DC transformer)
I read somewhere that if you sell a product that you plan to be UL certified, this means its power supply must be UL certified as well.
This means that if you supply power via a transformer (external ...
- 1,369
0
votes
2
answers
101
views
ATX Computer Power Supply Spark in Non-computer Application [closed]
I would like to ask for your assistance with using a Silverstone DA1650 Gold computer power supply (you can find more about it here: Silverstone DA1650 Gold) for a non-computer application. In this ...
- 55
6
votes
2
answers
1k
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Is an AC/DC converter with no visible fuse before the transformer inherently dangerous?
I've been using a generic, unregulated mains AC/DC converter (wall-wart) for a very low-power project. It's output was a bit prone to 50 Hz ripple, so I opened it up to investigate how the circuit ...
- 657
2
votes
3
answers
164
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Trying to fix a mess with DC Power supply
I am not even close to know what I am doing with the electricity, but I have a power supply of my 8 cameras that is gone bad and I think I can manage to replace it myself, but there is a big BUT here. ...
-1
votes
1
answer
154
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AC-DC Schematic - Is this a Death Capacitor [closed]
Is this a death cap? I think it's not a death cap because it doesn't connect to the DC ground, but I'm not 100% sure.
Image Source: Hi-Link HLK-20M24 Datasheet - https://www.rhydolabz.com/documents/...
- 133
4
votes
4
answers
1k
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Predicting health of power supplies
I have a couple of 12 V, 1200 mA wall mount power supplies.
Currently, using a digital multi-meter, I am able to measure good voltage and amps coming out of some power supplies.
Since these are ...
- 49
0
votes
1
answer
75
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What fire tests are done on power adapters/chargers?
I was curious about the fire risks in using a typical AC-to-DC wall adapter
(e.g., this)
and went to the UL website
to learn what exact tests were done to get the "UL LISTED" stamp,
but I ...
- 554