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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100 views

How to amplify a signal from a function generator from 5V to 35V?

I have a function generator that has an output voltage of 10Vpp. I need to use it to drive a voice-coil-actuator (VCA) that operates on 35V and 11.7A. I was searching for a solution to amplify the ...
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2answers
164 views

Flyback transformer size vs. core losses

I'm in the process of compiling some notes on inductor design. I have good hands-on experience in the field (excuse the pun), but I feel this experience hasn't been totally systematic. I have been ...
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1answer
78 views

Turning a transformer into an electromagnet [closed]

I saw in a YouTube video that people turned a transformer into an electromagnet by rearranging the T-shaped metal. When I did the same and plugged it into the AC supply, it gets too hot. I tried ...
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Is this video fake? I thought Tesla coils only worked on AC

This video shows a 9-volt battery is connected to a wire as a primary. The first reason I think this is fake is that he is powering a Tesla coil with 10 volts. The second reason is that Tesla coils ...
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1answer
127 views

What is this binocular transformer and how do I model it in LTSPice, Have High SWR In Ham Radio

I purchased this 70 Watt Amplifier Kit and built it. Unfortunately, the kits do not come with any instructions. I have managed to find a variety of web sites where people built the amp and offered ...
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114 views

Difference between unbalance load connected to grid vs isolated generator

Given two cases as following- CASE 1 An isolated 3-phase synchronous generator in star connected to a star-star 3-phase transformer and then secondary of transformer is connected to a highly unbalance ...
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1answer
70 views

Induction in transformers and maintaining constant magnetic field

According to Faraday's law the net flux in the core of a transformer will induce an EMF in both coils, and that magnetic flux generated by each induced current in the coils (on-load) will oppose any ...
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2answers
253 views

How to determine the power capacity of a transformer

I want to use a transformer as a step-down power supply. How can I determine the maximum power of a transformer if there is no data on it. Based on what I have read, I understand that with an increase ...
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81 views

Low frequency transformer core material

For the first time of my life, I am trying to do a low frequency transformer. I’m used to seeing low frequency transformers built with, what I think to be, laminated silicon steel. I have some ...
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58 views

How to decide input filter specifications for linear power supply design

I am newbie trying to design a precision linear power supply and I have already chose a transformer which will meet my output requirements. Now, I am not sure how to figure out what parts should I use ...
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1answer
125 views

Photonicinduction - Less Turn Equals "Same Amps" but "Less Voltage"

I was recently watching a video by the youtuber ‘Photonicinduction’ and I came across this video. When the video was at 1:50, I noticed that there were 4 Turns on the primary and secondary so its a 1:...
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2answers
65 views

Can I reduce flyback transformer into a single inductance to calculate the duty cycle of the MOSFET?

I am trying to calculate the duty cycle of the MOSFET in a flyback topology SMPS. From the selected converter's datasheet, I am given the equation: Since I am using a flyback topology, what is my L ...
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1answer
143 views

Why is the saturation in the opposite direction different from the saturation?

I am trying to obtain the hysteresis curve of a iron core transformer. To integrate the voltage output from the secondary coil, I used an LM741 opamp, 10k ohm resistor, 0.1uF capacitor, and 1M ...
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1answer
59 views

Calculate the expected input resistance

how would i calculate the input resistance of RS resistor ? to achieve 250mV at the V(in), any help would be great .(i don't even know where to start )
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1answer
78 views

What is the fault level of paralleled transformers? [closed]

When paralleling transformers the fault level at the bus is it the sum of the individual transformer fault level?
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1answer
54 views

3-phase autotransformer bank

The question is: The solution is: What does the winding apparent power represent? I mean two windings each is 16.5 MVA gives a sum of 33 MVA. This is not the same value as the 60 MVA. Why? Source: ...
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3answers
108 views

matching impedance transformer in old designs

I want you to see my question from an "historical point of view"... Building circuits that I found in magazines of the '60 I see a lot of interstage transformer between Ge transistor stages ...
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1answer
79 views

What type of transformer is this and what should I be looking for?

I'm aware it's a step down transformer but you know how some transformers are 9-0-9 v transformers, yeah, what's this? By what should I be looking for, i mean what should I type if I'm googling it for ...
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Transformer core (eddy + hysteresis) losses

The question is: The solution is: However, Transformer core Losses For Eddy current losses I think they will not change. For the Hysteresis losses the flux is raised to a power greater than 1, so, ...
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24 views

Additive polarity transformer uses

Why are additive transformers used? I mean it's confusing to me that there are additive polarity transformers. Also, Why are they used in small kVA? Source: Analysis of Faulted Power Systems J. B. ...
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19 views

Delta-wye transformer phase shift [duplicate]

For a delta-wye transformer, the primary voltage is in phase with the secondary phase voltage. Assuming it is an ABC (positive) sequence system with counter clock wise rotation and that phase A to the ...
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59 views

Using transformer in simulation software

I am trying to simulate a transformer in Proteus. But the following are some of the parameters I am unable to understand. Trace Inductance. [Advanced Properties]. Max Permeability. Saturation ...
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1answer
115 views

Can a wye-wye transformer be reconnected to open delta?

A three-phase transformer bank is connected wye–wye. By Disconnecting one of the three transformers, can the two remaining transformers be connected open-delta? In my opinion if the system is ...
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2answers
129 views

Ringing in inductively coupled coils

My circuit consists of two inductively coupled inductors. A 40 kHz 600 mV sine voltage is applied to the primary inductor. The induced voltage in the secondary inductor shows some ringing in the area ...
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2answers
100 views

How can I extend the pulse length of a gate drive transformer?

I'm designing a coilgun stage that uses a pulse transformer to switch a high side N channel mosfet. The issue I'm having is that I can't get the firing pulse through the transformer to last longer ...
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4answers
46 views

Current draw calculation from single phase 3kW transformer being fed by a 400Vac three phase source

So I have a 400 VAC 3 ph source feeding a 3 kW 1 ph transformer. My question is... how much current will this xfmr draw with respect to the 400 VAC 3ph source? I understand how to calculate the ...
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2answers
76 views

Voltage source on both sides of a transformer

What will happen if we apply voltage sources (AC) on both the primary and secondary side of a transformer? How will the coil and the flux produced inside it behave?
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parallel transformers loading

The question The answer: However, using the below highlighted formula: I quote “Transformers will be unequally loaded if their kVAs are different” Not true, from the following If %Z2 * S1 = %Z1 * ...
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1answer
57 views

Does the quality of current transformers matter?

I would like to do some current sensing, i would like to know if cheap current transformers like the the SCT-013s as good as abit more pricier onnes on digikey, what should stop me from making my own?...
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2answers
541 views

Using 3-tap 127/220V to 12V transformer as a poor man's 127V to 220V autotransformer

I need to actuate a few contactor switches that need 220VAC in its coils. The problem is, my application is fed by 127VAC. Therefore, I need something like a 10W, 127V to 220V autotransformer. These ...
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57 views

Reduce the effect of half wave rectifier on transformer

I have an electromagnetic feeder drive which is supplied from a transformer. When I see the catalogue of the drive I noticed it using just the positive pulse of the AC source (half wave rectifier.) ...
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1answer
73 views

Choosing transformer for precision power supply design [closed]

I am trying to figure out what specification transformer I need to design a linear precision power supply which has 3 channels operation with certain requirements. All the 3 channels have total power ...
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52 views

real transformer power factor

For a transformer having input and output power factor what do they depend on? And if I want to find the transformer power factor is there a certain formula to get the overall power factor for a real ...
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1answer
62 views

Electrical safety best practices for a transformer secondary

If I'm building something with a transformer that has mains on the primary and something like 24VAC, or just any voltage lower than mains on the secondary, what are the best practices in terms of ...
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1answer
26 views

How can i measure a transformer primary inductance with a load on the secondary?

I have an x-ray closed transformer and I only can access to the primary terminals. I want to measure the inductance of the primary and to know how this loaded secondary influences it.
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421 views

Gate driver burning and snubber design for half-bridge transformer driver

IR2113 floating channel digital-input half-bridge transformer driver Dead time is properly set Channel supply VPP 20-60 V, gate bias supply 15 V Operation frequency 15-100 kHz, operation mode PWM or ...
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2answers
188 views

AC to DC without transformer

Can someone explain how I can convert 220 V AC 60 Hz to 12/5 V DC, 500 mA/1A without using any transformer? Like Sonoff or Shelly power supply. Thank you so much
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Transformer excitation current vs voltage relation

I do not understand why if I increase the voltage of a single phase transformer the excitation current is increasing. Is it because of the rated voltage? As we know, when the primary voltage reaches ...
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3answers
242 views

What makes Tesla coils better than conventional transformers at generating high voltages?

The voltage gain of a Tesla coil can be determined from the primary and secondary inductances \$L_1\$ and \$L_2\$ using the following formula (Wikipedia has a simple derivation): $$ \frac{V_2}{V_1} = \...
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1answer
38 views

Parallel Operation of Transformers [closed]

Can we connect Dz1 and Dz11 in parallel, in the case of transformer banks?
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76 views

How to get gain out of a 1:4 balun transformer while also matching the impedance?

This circuit is supposed to be a low noise method of getting significant (12dB or 4V/V) voltage gain. I noticed that when I impedance match the secondary load to the source resistance, the voltage at ...
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3answers
183 views

Typical tolerance of transformer secondary voltage?

I bought a transformer that said it would transform 230VAC to 34VAC (actually 2x17VAC, but it came with instructions how to connect the two secondary windings in series to get 34VAC.) Even taking into ...
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1answer
190 views

Hysteresis curve does not look like what is expected on the oscilloscope

update: Based one the comment from @Andy aka, I tried to obtain the curve without using the integrator. It does give me a better looking graph. Afterward, I switched the power supply to another larger ...
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38 views

How can the magentic flux be determined in a transformer with airgap?

I am planning to conduct chemical reactions in an AC magnetic field at 60Hz. The magnetic setup is made of two 1.4kW microwave transformers with HV coils and Iron I-cores removed. Then the two ...
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2answers
60 views

Understanding Specification & Datasheet For Center Tap Power Transformer

In a desire to better understand transformers, I have purchased a simple power transformer: It is the model 187C24, manufactured by Hammond. I'm having trouble understanding the data sheet. I have ...
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1answer
201 views

How do I calculate the maximum load on a center-tapped AC/AC transformer for a bi-polar linear power supply with full wave rectification?

I have a 24 VCT AC to AC step-down transformer, which has three wire leads on the secondary. I'll call the secondary leads X, Y, and C, where C is the center tap. With a DMM, the voltage between X and ...
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2answers
192 views

How does a transformer operate with a short in the windings

I'm trying to learn more about transformers that are failing. From my understanding transformers create heat. From too much load or current on the secondary side of a step-down transformer, the heat ...
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3answers
97 views

Piezo driver IC or 0-5V to 0-300V translator IC

I am new to electrical engineering applications so please excuse any lack of correct language. I am looking for a 4 pin (2 on each side) or 8 pin 2 channel IC that translates a voltage difference on ...
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60 views

Double secondary winding transformer/EMC problem

I'm using the IL-10-0002 a double secondary winding transformer that I Will connect in series. I'm wondering if I will face EMC problem when connecting the scondary winding in series ? Do you have any ...
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61 views

Transformer load

I have 50 kVA delta-wye transformer with 3 single phases secondary (line-neutral) delivered to 3 houses, So if one of the 3 houses drown more power would that affect another 2 houses, or each phase ...

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