Questions tagged [transformer]

A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.

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50 views

What happens to the windings on a transformer during tap changing?

I'm trying to figure out what the windings do when a tap change occurs on a power transformer. The picture below is my understanding of how tap changing occurs when there is an increase in load on the ...
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Identifying and finding a replacement audio signal transformer 50 ohm / 0.5 ohm

I am trying to identify and find a replacement for the attached transformer. The green/white leads with the red center tap have a 50 ohm resistance. The side without the center tap has a 0.5 ohm ...
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Autotransformer equivalent circuit

I am trying to find an equivalent circuit for autotransformer. But there is no any source about it. I tried to solve something about it. Can anyone have any idea about it?
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Would it be possible to power an X-Ray tube using a Marx generator?

To the best of my knowledge most X-Ray tubes are powered by a smaller voltage running through a large transformer to step it up into the magnitude of 10-100 KV. This larger voltage is then pulsed ...
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Isolated power supply to the DIY projects

I am very new to electronics and electrical engineering background. I am working in an electronics engineering job for the past 4 months. My question is: what can I use or what is the best way to have ...
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Could i use an AC Arc welder as a Dimmer [closed]

i am trying to slow down my electric jigsaw a little bit. Since it needs a lower voltage in order to achieve that i came up with the idea of using an old and heavy arc welder, which only consists of a ...
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1answer
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Meaning of N parameter in Chan Model LTspice

I'm trying to model an audio transformer for core saturation simulation but I don't understand what N parameter represents in the Chan model. It should be the number of turns of the windings but if I ...
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How do we check core?

I found few ferrite cores recently from my tools box they are T60006-L2063W517 -- Ferrite Toroids / Ferrite Rings Core 63x50x25 58.6uH@10kHz well my question is, how do I check they are in good ...
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Transformer Power on the Primary and the Secondary

I am confused as to the power of the primary and the secondary of a transformer. An elementary textbook says the power on the primary and the secondary are equal (and therefore there is no power gain ...
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What is the purpose of transformers on the output side of a DC power suppply?

I have a PSU that plugs into 220-240V AC mains (L&N, no ground) and outputs 9V DC to a single barrel plug. On the barrel plug side, just about 10cm before it, there's a little box on the cable ...
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Using a dual winding transformer to provide dual winding AC and DC of a single winding

Ok, this feels like a stupid question, but my google-fu is not with me today. I have an application in which I have a need for both 12V DC (or thereabout) and 24V AC. I have a transformer that has two ...
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Can anyone help me identify this transformer?

I'm trying to make a project using used part from a radio with my basic electronics knowledge. I want to convert this AC 9.7V to a steady DC 3V using a diode bridge so I need to know what I'm working ...
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Increasing current with constant voltage

simulate this circuit – Schematic created using CircuitLab I got a sine wave from an STM32 DAC. Its voltage is 2.64 V. I wanted to amplify it. I used this schematic. Its gain is 4.3. I got 11....
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Does order matter in a center tapped transformer's windings?

I have a center tapped 20-0-20 transformer whose wire colors on the secondary are notated as follows: ...
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72 views

Is there a safety issue with adding a grounded transformer to an ungrounded network?

Scenario: Installing a grounded center-tapped transformer in an ungrounded system on a ship. We have eight 11 kV to 460 V ungrounded three-phase delta-to-delta transformers feeding as many ...
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What do the numbers on computer power supply transformers mean? Where can I get datasheets for these types of transformers?

What do the numbers on computer power supply transformers mean? Where I can get datasheets for these types of transformers?
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Symmetrical Components - Three-phase D-Y transformer with unbalanced voltage and loads

I have a Delta-Wye transformer, N1/N2 = 4, and am trying to solve the circuit below, with 120VAC applied to terminals VAB only. On the secondary I have 1 ohms connected between a-n and 5 ohms between ...
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How to find a transformer for a dry cleaning machine?

My dad asked me to help him find a price estimate and figure out the ordering process for a new transformer for his dry cleaning machine. He's not that fluent in English and isn't too comfy using the ...
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Independency of core flux of an ideal transformer from load

For an ideal transformer with magnetization reactance and load on secondary side ,we draw equivalent circuit like this (below)- And from equivalent circuit ,we can say that no matter what will be the ...
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2answers
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How to limit current for a transformer?

So I've been winding and unwinding, all to get the current right but it's not going well, so I'd like to know how I can limit the current going into the primary side of my transformer, since the ...
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Need help with identifying transformer ratio

Does the transformer ratio 240:15 or 240:30? It's a bit confusing
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Transformer power supplies, which one would have a 24VAC secondary when the DC output is 9vdc > 12vdc > 15vdc > 32vdc

I need 24VAC 300ma for a solenoid and have these old transformer power packs with outputs of: 9vdc, 12vdc, 15vdc, 32vdc. I'm willing to crack open one and use the transformer but I only want to open ...
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102 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 ...
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What is the difference between a 120v 10 amp transformer and a 240v 5 amp transformer?

I can't seem to find an answer for this online. What are the design considerations taken into account to determine the voltage rating of a transformer? If a transformer made in the U.S. is rated for ...
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152 views

Why don't transformers burn?

I don't know how transformers work but the primary coil has a closed circuit. If there is 0 load on the transformer it would short circuit
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Is a high open circuit voltage still beneficial when you have a high voltage/frequency pulse arc starter?

In welding, I know a high open circuit voltage is a major factor in the strength/quality of your arc when you scratch start, but how much of a factor is it when you have a pulse starting mechanism? Is ...
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Transformer different resulting current and voltage than expected

I am uncertain why the current on the secondary side does not follow the equation: $$i_2 = \frac{N_1}{N_2} i_1$$ which gives $$i_2 = \frac{20}{3} i_1$$ To measure the current I use two 1 ohm resistors ...
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What kind of electronic component is this?

I am trying to repair the flash of a P900 camera, since it gives a burning smell after being used. After disassembling the flash unit, I came across this part for which I need some professional eyes ...
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Can you really put 2 transformers in parallel connected to a single voltage 220VAC 60hz?

The 10 volt secondary transformer will be used to ATMEGA328P while the 25 volt primary transformer will be used for logic gates.
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I want to show that full wave rectification equation is correct by Proteus

I want to verify the full wave rectification equation using Proteus, but I get wrong voltage values. Please if any body knows how to do it, tell me.
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Is the transformer working and possible identification

Unfortunately 2 nights ago, my 120V stereo was plugged into a 220V socket directly. (I'm just about talking to the offender again). The stereo now ceases to function more or less Radio, tape player, ...
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Can I build a 3-phase transformer bank out of single transformers of different KVAs?

Can I build a 3-phase transformer bank out of single transformers of different kVAs? Can I build a 3 phase transformer bank with 2 transformers of additive polarity and 1 of substractive polarity? The ...
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Improving transformer voltage regulation / efficiency through construction [closed]

I am wondering what modifications can be done to a transformer during manufacturing to improve its voltage regulation and efficiency?
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How to convert 220 volts AC into 12 volts DC using a transformer?

I tried to build a circuit that could convert 220 volts AC into 12 volts DC: My voltage output is as I wanted but the measured current is always blank. Can anyone explain why this is happening and ...
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Unused output of a flyback transformer

I have a flyback transformer. It has 2 outputs. I'm going to use one of them on a flyback converter. Should I leave the second output of the transformer unconnected or connect a load to it?
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Circuit Gives DC Current instead of Sine signal (LTspice XVII)

I'm a mathematics and physics student. I am trying to simulate the circuit from the paper "Design and implementation of a lightweight high-voltage power converter for electro-aerodynamic ...
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3answers
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Unknown DC-DC converter topology in ST datasheet

I have found this weird DC-DC converter topology in datasheet of MC34063 from ST. The primary charging is single ended, so at first it seems like flyback, but it has four diodes on the output instead ...
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I'd like to know if I can push 40 volts at 3 amps through an IRLZ44N MOSFET?

I already have the datasheet, it states it can handle 50 volts at 50 amps but I'm worried about spikes since I'm using it to switch the primary side of the transformer at 70 Hz and it will be a square ...
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106 views

How to smooth fluctuating DC from transformer?

For an audio amplifier, I designed an AC to DC (220v to 12V 2A) power circuit like this: simulate this circuit – Schematic created using CircuitLab When I powered my amplifier with the circuit ...
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Are there 2D-Transformers?

I need to create a PCB with a transformer on it, and in this case, I unfortunately can't solder on a regular one. I was wondering if there was anything akin to a 2d transformer, or just generally a ...
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Transformer Harmonics

A typical installation is Load - 400 V net - Transformer 1:25 - 10 kV net If the load is for example a SPS, the 400 V net can contain harmonic currents and thus have a considerable THDi. How can the ...
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Transformer Open-Circuit & Short-Circuit Tests

I need to find the losses of a transformer through simulation. I am measuring voltage, current & power. I know the method to find the losses but I am unsure if I should use the rms or peak values ...
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Transformer synchronization

I am reading a book about transformers and I am confused by the following paragraph about synchronization check: When the transformer trips or is taken out of service, the primary and secondary ...
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48 views

Transforming bike dynamo output to reduce diode bridge loss ratio

I'd like to use a standard 6v/3w bike bottle dynamo to power a 18650 battery charging module TP4056 which also powers some LED's. Diode bridge rectifier steals 1.4v from the generator. In addition to ...
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64 views

Using a ferrite core transformer as an inductor for a boost converter

I am trying to make a boost converter. I'm stepping up 5V to 12V. I have all the required components, including a power MOSFET(IRLZ44N), a Schottky diode (SR260) and an astable multivibrator that ...
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Confusion - ideal transformer on load

When there is no load connected to the secondary, E is equal to U, and no current flows in an ideal transformer. Now if we connect a load on the secondary of a transformer, the primary will draw a ...
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What's the output voltage of this transformer?

Input is 120VAC. Let's say its a step down with a ratio of 10:1. Is the primary voltage 120V or 240V?
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Meaning of the terminology “referring to primary” or “referring to secondary” in the context of transformers equivalent circuits

I`m studying transformers equivalent circuit and encountered this term "referring" to primary or secondary and I was confused by this terminology. I tried to look for a definition but couldn'...
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Transformer overdraw behaviour

TLDR; - I want to connect such a low-value resistive load to a transformer that it draws ~1.6x the rated output current but I'll only do so for short periods of time so the transformer won't overheat. ...
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Ideal transformer paradox

It is true that an ideal transformer can not exist (but we can approach it as closely as want by improving the engineering behind it), but I think they may be mathematically inconsistent. To ...

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