Questions tagged [ac-dc]
Questions regarding the safe and effecient design and implementation of AC voltage to DC voltage supplies. Typically Mains to some lower DC voltage.
243
questions
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23 views
Can I use AC voltage from myRIO to power stepper motor?
I am using easydriver and arduino for a stepper motor provided on this website
The motor is 17HS3401S Stepper Motor and I think this is the correct datasheet found on the internet for the same. ...
0
votes
0answers
45 views
Send an AC signal from a DC device
I was able to read a 18VAC signal from the old-school door bell with a voltage divider to my 3.3VDC ESP controller. Nice.
Now, I wish to send a 18VAC signal (for 3 seconds) to open the door with that ...
1
vote
2answers
63 views
Laying out power electronics on analog signal board, practical advice
to keep this brief I am designing some audio circuitry and also need to design the power supply. The barrel jack in the schematic below sees 18VAC and I am converting that to +/-15V DC rails.
So to ...
0
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0answers
32 views
Power Supply Design 230 AC to 80V DC - multisim and real components
I am an young student that was tasked to build a power supply which will convert single phase 230V AC into 80V DC to test specific DC motors (custom made). I only know that under normal operation and ...
0
votes
1answer
32 views
Protection circuitry for AC/DC converter
I'm using the RAC02-GB (Datasheet) as an AC/DC converter and I'm confused about the protection circuit they included in the datasheet:
I want to make sure the AC/DC converter has the proper external ...
0
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0answers
62 views
Why does rectifier output is showing DC instead of pulsating DC
I am using below circuit for PFC.
Before connecting coupled inductor's auxiliary output to the IC's Vcc, I wanted to make sure that it is coming properly or not.
So when I probed the red dot in the ...
0
votes
2answers
68 views
Determine the resistor required for a circuit [on hold]
If I want to supply power to a device that is rated for about 2V using a DC source of 12V. How can I find the resistor o should use.
0
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2answers
55 views
AC/DC Converters in Series with the Same AC Source
Would it be safe to connect two identical AC/DC converters in series if they share the same AC source? My concern is that the negative DC output is grounded somewhere in the converters causing the ...
0
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2answers
48 views
Can this receptacle power this power supply? [closed]
My car has a wall-style AC receptacle in it. It is merely marked 110V 150W. It is not mentioned in the owner’s manual. I’m curious if it can safely power this laptop power supply:
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0answers
60 views
PFC boost converter is not stepping up the voltage
I am making a PFC circuit for AC-DC converter. I am facing a weird issue. As per my design the output of the circuit should be 390VDC, but I am getting 311VDCrms with ringing (overshoot 360V, ...
6
votes
4answers
947 views
Converting 8V AC to 8V DC - bridge rectifier gets very hot while idling
I am tinkering with an Arduino and recently had to convert 8V AC to 5V DC in order to run it.
The project is a custom doorbell, which gets the power from the doorbell transformer (transformer is ...
0
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0answers
35 views
AC adapter won't power fan at full speed [duplicate]
I have a spare 92mm case fan rated 12V and ~600mA I've used to build a solder fume extractor. When I was prototyping it, I tested the fan with a 12V 2.5A AC adapter and it worked fine, ran at full ...
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0answers
76 views
Astable 555 used for AC to DC Halfwave to DC stable conversion, is what I have done correct?
I have this falstad-circuit:
And here it is per request, as a SCH file screen:
I'm trying to use a 555 astable to convert a variable AC with maximum of 12V (coming from Bicycle Hub) to 8VDC, ...
0
votes
0answers
48 views
Use Triac as SMPS to get DC voltage
I want n 12V 1A supply for a project. I want a transformer-less topology.
I was reading and experimenting with readily available traic based dimmers. They use phase control to cut the input voltage ...
1
vote
2answers
130 views
How to find the right smoothing capacitor for rectification circuit
I am creating a power supply which will need to convert the 24vac to 5vdc. I am thinking of using a rectifier to convert ac to dc, then a capacitor to smooth out the voltage, then an LM2596-5 to drop ...
3
votes
3answers
244 views
Why aren't non-isolated DC-DC converters made for high wattage applications?
I am new to electronics. I am presently studying DC to DC converters.
One thing I noticed is that most of the people are using isolated stepdown converters like half bridge, full bridge, or resonant ...
1
vote
1answer
69 views
(230v)AC-DC(12v) wall adapter flashes when connected to dc to dc buck converter [closed]
So I used a common 230vAC to 12vDc (1AMP) wall adapter with dc jack like this
and converted to 5v using a dc to dc buck converter same as based on lm2596s
But the adapter LED starts blinking (...
0
votes
1answer
136 views
SMPS 5V without load, fluctuation on load TOP258PN [closed]
I am using PI Expert Online (this) to design a smps circuit for 5V, 2.5A output. I already have TOP258PN IC with me so built circuit for that.
Change from schematics: I am not using choke and using ...
4
votes
4answers
404 views
Is DC-to-DC (24 V to 12 V) buck conversion typically more efficient than AC-to-DC (110 V to 12 V) conversion? [closed]
While building an online UPS system, I'm basing the choice to eliminate as many AC inverters from the system as possible because of the assumption that DC-to-DC conversion is more efficient than AC-to-...
2
votes
3answers
104 views
Please help me understand how to add AC power to my DC device
I have a device that runs off of three D batteries. I would like to be able to add a power cord so that I can plug it into the wall and run it off of that instead. I would also like to still be able ...
3
votes
1answer
99 views
Different Wattage Solar Panels for Home [different Voltage/Ampere]
My current solar system for home
12V 100W polycrystalline Solar Panel.
12V 75Ah Lead Acid solar tubular Battery.
PWM 12V 10A Solar Charge Controller.
12V Input and 200VA Output Inverter.
Current ...
1
vote
2answers
145 views
Power drop on AC-DC converter due to relay
A uController circuit is powered with an AC-DC converter. This circuit in turn acts on some relays to turn on and off some loads. We have two bi-stable relays and another simple relay (Omron G5DN-1A) ....
2
votes
4answers
162 views
300VDC to 24VDC voltage converter - Cheapest implementation
In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation.
...
0
votes
2answers
61 views
How to insulate DC from earth noise while keeping it referenced to it
I have an AC/DC converter (220 to 24) inside an electrical cabinet. The 0VDC is referenced to earth, like this (couldn't find a symbol for an AC/DC converter in the schematic editor so I made a dirty ...
1
vote
2answers
94 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 ...
0
votes
2answers
70 views
3.3v Powersupply
I have been needing a 3.3 volt power supply that can use at least 12-24 volts ac dc in. I have looked online and managed to make this schematic
but I have no idea if it works.
I was hoping if you ...
1
vote
1answer
152 views
Why would this Class D Audio Amplifier have low current draw?
Disclaimer: Saying I have very little knowledge of electrical engineering theory is an overstatement. I very much appreciate your help and patience. I'm not finding any questions similar to mine, but ...
0
votes
1answer
591 views
Is it safe to use a 19V DC adapter for a 12V input if it can provide enough watts? [duplicate]
I have a small TV which expects 12V DC at 34W. Can I use an adapter with a higher voltage rating (19V for example) as long as it can provide enough amps to satisfy the amount of watts needed by the TV?...
0
votes
2answers
118 views
Am I safe working with a power supplier of 12 DC connected to the AC wall socket main line?
I'm working on an electronic home experimental project. But
I have always been afraid of the issue of electricity since it can electrocute.
My question is.. Am I safe working with a power supplier ...
0
votes
2answers
82 views
Transformer in 127V AC - 5V DC Converter
There is a transformer in this 127V AC to 5V DC Converter. I am trying to get one of them. But I don't know what kind of transformer is and I am unable to find it in my city.
Also, it is so small. ...
0
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0answers
41 views
SMPS topology for combination of current controlled rail and fixed voltage rail
I'm looking at designing a LED driving power supply that can interface with a universal AC main input (~90VAC-260VAC) and produce 2 rails at the output; one a current controlled rail, and the other a ...
-1
votes
1answer
131 views
How do I choose appropriate fuse for my circuit?
I am currently using a AC-DC adaptor with specs:
AC-I: 100-2040V~50/60Hz 1.6A
DC-O: 12V 5A
Which is powering up 8 DC motors,
4× 12V 6W
4× 12V (wattage not specified, the motor is meant to be ...
1
vote
4answers
148 views
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 ...
0
votes
1answer
138 views
Gigabit detection DIY
Ethernet up to 100Mbps uses only 2 of the 4 twisted wires in an ethernet cable while gigabit is using all of them. Connecting an LED to one of the gigabit-only pairs should therefore make it easy to ...
1
vote
0answers
172 views
Reducing AC/DC adapter (SMPS) output voltage
I have a AC/DC adapter P-1650-22 (used to power a notebook) laying around.
I would like to use it for other purposes, i.e. as a constant voltage source for LEDs.
The problem is, that the output ...
2
votes
4answers
166 views
Converting Christmas Village from DC to AC
So this was the year we bought a AC-powered O-gauge Lionel train and a battery-operated village to add to our Christmas tree decor. The problem, the village eats batteries like a kid eats cookies.
...
0
votes
2answers
87 views
Is Cadence unable to simulate AC to DC converters using simple full bridge rectifier?
I've tried several different topologies, such as the full bridge rectifier and the following which I've successfully tested on other simulators.
However, on Cadence I always end up getting static ...
0
votes
1answer
177 views
What components do I need to add to the power circuit for this ESP8266 project?
I'm planning to make some controllers for each of the electrical heaters in my house. The heaters use a pilot wire to control their mode of operation:
I'm following this project to control the pilot ...
0
votes
2answers
98 views
Design an AC/DC Nonisolated Switching Mode Power Supply
I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because ...
0
votes
1answer
55 views
What is the best starter adjustable power supply for pretty cheap (preferably ac/dc) [closed]
Please I am just a kid no $8953739857239875 power supplies. Btw I am an inspiring electrical engineer and I'm 10 so I need a bit of help so I don't how do I put this nicely, ahem trip the breaker if ...
2
votes
1answer
427 views
Function of the Third Pin Inside Laptop Barrel Connector
So I've been doing research on barrel pin connectors, and have been trying to apply this knowledge to understand laptop barrel connectors, specifically. My confusion relates to the function of the ...
0
votes
3answers
82 views
Changing AC amplitude and frequency
I'm working on a project for school to monitor a 6 and 15 VAC signal coming in at 11KHz for both. I'm trying to find a simple way of recreating that at home for running some tests on circuits I'm ...
0
votes
1answer
48 views
How to size transformer for a circuit?
I am using a 5 Watt PCB mount AC/DC power module with universal input(85-264 V) and output as 12 V. The cost of the module is very high so thought if we could replace the module with a PCB mount ...
0
votes
2answers
144 views
What should I buy to test whether my DC power supplies are able to provide their rated power? [closed]
I recently bought an aftermarket AC-DC power supply for a laptop which was woefully defective. When connected to a Chromebox, a boot message appeared indicating that the supply could not provide ...
0
votes
2answers
206 views
DIY electromagnet using copper wire and AC adapter
I want to make for some demonstration (caching some paper clips on ON and doping them on OFF) electromagnet made from copper wire (should it be single wire?) with ferromagnetic inside coil:
As power ...
0
votes
1answer
116 views
Simple AC to DC converter: upper limit for the capacitance of filter capacitor?
By 'simple AC to DC converter' I mean the familiar circuit shown in the figure below, where the capacitor C reduces the ripple.
A sufficiently large capacitor can be used in order to reduce the ...
0
votes
1answer
45 views
Non-isolated DC power distribution for an appliance
I am building an appliance where we have a device where we need to have a +48 V/300 W DC power rail and a +24 V/300 W DC power rail. The AC (mains) should be world-compatible (both low- and high- ...
0
votes
1answer
66 views
About Ac to DC convertor..? [closed]
Which is the best way to convert Ac to DC , with maximum efficiency possible by using a transformer.
The required voltage is 5v and current is 1a .
I saw a circuit from my mobile phone charger they ...
0
votes
0answers
52 views
Fuses on both lines of an isolated AC/DC converter
I'm redesigning a board made from another person. This board have several AC/DC converters (like Traco TMP07 Series and similar) and some screw connectors to connect external devices. Neither the ...
-1
votes
1answer
68 views
What products can be used power LEDs from an wall outlet? [closed]
I am currently working on a project that will be a type of night light that plugs straight into a wall. What parts can I use to convert the wall outlet voltage into that which can be used by a couple ...
