All Questions
14
questions
0
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1
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59
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Seeking a good solution for mitigating the effects of high in-rush current caused by an AC-DC converter [closed]
Many AC-DC power supplies (say, 220VAC to 24VDC) have huge inrush current values. For example, a device might have an inrush current of 80A@230VAC. This raises the question of how to handle the ...
- 474
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
-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
3
votes
4
answers
1k
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How can low voltage, low-current power be efficiently extracted from mains?
If I wanted to drive, say, a 1V 0.1A device from mains, I could step down the voltage with a transformer, but if the device was basically just a resistor (overall), then the resistor would have to be ...
- 273
1
vote
3
answers
393
views
Power supply transformer question, double primary
I'm trying to make a circuit to look like this one:
This is from ATM90E26 Application note, this IC needs to be connected to mains in order to measure voltage (220VAC) and current. I tried to look ...
- 57
1
vote
2
answers
601
views
Capacitor protection in transformerless power supply
I am designing a capacitor based transformerless power supply for a WiFi-based device which will be on for 24x7, with an input of 230VAC at 50Hz.
For almost 80% of the time, the device would consume ...
- 71
1
vote
2
answers
236
views
AC "chopping" power supply inrush current problem
I've made a simple AC to DC chopping/switching power supply circuit (I'm not sure if it's called that) as shown below. in the left part of circuit (which is the gating/chopping part) when the ...
- 2,017
1
vote
4
answers
1k
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How can I run my e-bike wheel on AC power?
I have an electric wheel designed for an electric bicycle conversion. By my understanding, the wheel is essentially a 48V, 1000w rated brushless DC motor. It comes with a thumb throttle and kill ...
- 11
3
votes
2
answers
2k
views
Fuse for parallel AC/DC power supply
I am designing a system which will use two 12V AC/DC 60W modules (Meanwell IRM-60-12)
I would like to protect the system using a fuse. In the case of a parallel design like the one below, should I ...
- 104
-1
votes
2
answers
2k
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Multimeter reading 0 and drawing too much from DC power supply
So I've got a circuit that requires both 5V and 3.3V so I bought a 5V 2A AC/DC converter from a store, which I will add resistors to later for the 3.3V. Before I connect it to my circuit, I wanted to ...
- 109
0
votes
3
answers
583
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Using thermal overload protection in AC-DC PWM motor driver circut
i'm having some difficulties with calculating the value of the thermal overload fuse in this circuit.
The thermal fuse is used to protect the motor and the circuit behind it. The deal problem is that ...
- 3
2
votes
1
answer
155
views
Transformer and a relay in series - but function like in parallel, but not exactly
I've been doing some planning to build a home automation system on top of the existing power infrastructure of my house.
The first thing would be making my light switches smart. My original plan is ...
- 163
1
vote
0
answers
253
views
What controller for a 400W AC-DC SMPS?
I would like to build a big AC-DC SMPS. I built a little one based on ST's VIPer22A. This is a nice little IC that can give up to a couple watts (my design was 5V 1A). It was easy enough to design ...
- 1,181
37
votes
4
answers
1k
views
If we could start our electrical grid from scratch with today's technology, which would be the most efficient choice? AC or DC?
Lately, I’ve been reading about the many advantages of HVDC transmission systems for long distance transmission, undersea links, and others. The historical reason of why AC was picked over DC was ...
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