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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48 views

RMS Current through output diode in a flyback transformer with multiple outputs

I clearly do not understand where does this formula comes from ... (I did not find it on internet) $$ \mathrm{ I_{diode_{rms}} = \frac{\sqrt{1+\frac{A²}{3}}}{\sqrt{1-D}}*I_{out_{avg}} } $$ where Iout ...
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Determining the different current saturation levels in various metal cores in a transformer at various frequencies

I'm going to preface this with: This research is not being used for direct transformer design. However, my question is, in an electrical transformer, will different core materials (such as copper, ...
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54 views

Sourcing Transformer with Specific Turns Ratio

I am looking at a building an electronics project that calls for a transformer with a specific turns ratio '1:4:50', and am trying to source a component. I am working on the project from this tutorial:...
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Why ferrite core transformer not giving output? [closed]

Bmax level set by flux density vs frequency chart from core material that is CF139 , I'm using UUR6440,used handmade litz wire still not getting desired output. I am expecting 50KV at 50 kHz.
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49 views

Transformer Measurement and Simulation

I have a 220VAC:1200VAC 800VA 60Hz toroidal voltage transformer and I'd like to measure its parameters to simulate a circuit I'm gonna build with it, in order to understand better the transients. The ...
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30 views

Current and voltage complex diagram for a transformer

I was wondering how would a complex diagram for current and voltage look both for an ideal transformer and for a fully coupled lossless transformer. The diagram for a coil looks like this: The ideal ...
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36 views

3 phase power convert to 3.3v raspberry pi signal

I have a project about to mantain a data log of a 3 phase motor, when the more is on and off count that time and save in memory location. I don't use any server now to save data, I use a Rpi to do all ...
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22 views

120/277VAC to 12V DC SELV

What's the go-to way to make 120/277VAC to 12V DC which is SELV compliant on a PCB? I know one option is to purchase an ACDC converter like the IRM-02-12, but it seems a bit expensive. I'm surprised I ...
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37 views

Modify Spark Ignitor Circuit for Bug Zapper Functionality?

I have been doing some research on building my own bug zapper circuits for use in an art project (just for arcing electricity, I'm not killing any bugs), in particular finding a good source for ...
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1answer
65 views

Logic gate circuit to close when sensor signal turns ON and then OFF, but must ignore another ON?

I am trying to put a permanent magnet in a transformer between both coils, so that the transformer can utilize the flux from the permanent magnet by guiding its flux periodically. We have one primary ...
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88 views

Need help to understand inductor based non-isolated offline buck converter [closed]

Here ADGJ IC is used in offline buck topology. Can anyone share the schematic of it. Picture taken from sonoff mini and shelly1 board is attached below
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38 views

Delta and Wye configuration

The problem:Complete the transformer wiring diagrams according to the Delta primary and Wye secondary configuration. The secondary will be configured for High voltage. Connect all loads as needed. ...
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1answer
48 views

(Experiment) What if I run a DC motor with unfiltered sine pulse DC voltage?

I have read a lot about using high frequency square/rectangular wave pulsed DC for motor speed control aka PWM-ing, but my question is a bit different. What if I run a DC motor with a low frequency ...
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24v AC common/ground

I'm trying to understand what I believe to be a basic/fundamental theory, however, I seem to be over analyzing. On many hvac units the 24v or 120v control transformer common is grounded to the unit ...
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41 views

Equivalent transformer model AN1679/D

I found the following transformer model in the AN1679/D written by ON SEMICONDUCTOR. The document is really interesting and very well explained. Nevertheless, I do not understand this point, how the ...
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Linear Variable Differential Transformer Operation

Ok, so I am a bit unclear on how this device works. I know it converts the linear displacement to an electrical signal and the movable magnetic core acts as the linear displacement magnitude. My ...
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1answer
80 views

Gate drive transformer for lower frequency (25 kHz)

I am doing this half bridge to generate High voltage from 300VDC.(Around >10000Volts for a corona discharge tube to produce ozone) I have gone through many application notes for making one GDT for ...
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1answer
40 views

How to find the secondary inductance value in flyback transformer?

I try to design smps converter with flyback topology. Parameters are below: Vin = 100V(dc) (constant) Vout = 50V(dc) D(on) = 50% (So, D(off) = 50%) fsw = 70 kHz Np/Ns = 2 According to my calculations ...
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Why can't I get any proper arcs out of this flyback transformer?

I salvaged a flyback transformer from an old TV and used it in a single MOSFET driver like this: I used 6 turns of insulated copper wire to make the primary coil with the centre tap and again 6 ...
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2answers
37 views

Insulate active or neutral?

If you can only insulate active or neutral, which should you choose? Does it matter? Is it important? Is one better than the other?
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1answer
23 views

Issue with n channel mosfet switching with an isolated gate drive

I am trying to make a n-channel mosfet switch a load from a high voltage (250V). I am using the n channel C2M0280120D mosfet. the circuit looks something like below: simulate this circuit – ...
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1answer
67 views

Transformer Going Up In Voltage Over Time

I have a transformer from a 1953 jukebox that seems to be increasing in voltage over time. When I first got it, it was outputting 32V. A week later it seemed steady at 38V, then 45V. Now I just ...
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AC servo position flight surface control system [duplicate]

So if a control transmitter is used to set the Pilot's input command signal and a control transformer is used to compare this desired position to the current position and produce an error signal. My ...
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1answer
80 views

What happaned when the flyback transformer is in saturation?

I am trying to design a DC-DC flyback converter. Input voltage is 110V and output voltage is 24V. I have used NCP1252A PWM controller. Flyback transformer windings: Primary -> 24 turns Secondary -...
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1answer
73 views

High Voltage Safety Questions

I'm working on a project that uses 1700VDC provided from a 220V:1200V isolated toroidal transformer, bridge rectifier and filter cap. I have no experience with high voltages, so I'd like to ask you ...
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First power supply on 10V output

I am new to electronics and since I am studying computer engineering (4th semester right now) I am not that familiar with analog electronics. I have a small project that I want to implement mostly in ...
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54 views

Transformer 220 to 110 ac

for a 220V/50Hz, 2.8 A, 500W what is the Amps equivalent for 110V/ 60 Hz? Using a 220V /110 V step down transformer with Hz converter included.
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About magnetizing inductance

Consider a two windings transformer (I'm not talking about flyback transformer): Magnetizing inductance is not equal to mutual inductance. Mutual inductance refers to the energy which is transfered ...
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Step-up transformers with varying voltage outputs in parallel on single line?

Just curious if this is possible. I also know this is very simplistic. Say I have an AC generator that outputs 24V. I have three separate devices that each require a different, increased voltage to ...
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APFC C.T.Position [duplicate]

We installed on grid solar plant. Before installation P. F. was always maintained to 0.99 by capacitor banks(APFC panel). But after solar connection is varies and goes down up to 0.16. APFC panel CT ...
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98 views

DC through an inductor

I get that the frequency is zero hence the voltage is consequently zero according to the the equations, but any current through a conductor should produce a magnetic field. I also understand that ...
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48 views

Drive Capacitive load with toroidal transformer

this question is related to my previous post: Toroidal transformer voltage breaks down I am trying to build a circuit that drives a capacitive load (approx. 9nF) through use of a toroidal transformer. ...
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1answer
40 views

How to place MOV when you have a center tapped transformer 127V 220V

I am building a circuit that gets power from AC. I have a center tapped 220V transformer, so I added a switch for 220V or 110V (the three wire sockets) I added two MOVs, one S20K230 for 220V and a ...
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1answer
38 views

Zero Sequence current Understanding

In literature zero sequence current is called DC component. If it was DC component then how a zero sequence current in neutral grounded secondary of a transformer cause current in neutral grounded ...
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45 views

How To Source Transformer Component for Bug Zapper Circuit

I am looking at designing a small bug zapper circuit of the type described in this post: How does this mosquito zapper circuit work? Here is an approximate schematic of what I am trying to build: I ...
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1answer
76 views

Toroidal transformer voltage breaks down

I am having some trouble understanding the behaviour of my toroidal transformer. Currently, I am using a 400V to 12V transformer in reverse, meaning I supply 12V and around 1.5 A to the secondary side ...
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Comparing inductances from LCR measurements and FEMM simulations of a simple transformer

I am trying to compare the results from a simple transformer using two identical Wurth Elektronik inductors (Reference 760308102308, datasheet attached). I measured the inductance with an LCR while ...
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Ignition coil circuit efficiency

I have a circuit which pulses an ignition coil and requires a 6W input. Under load it has an efficiency of around 85% and an output power of approx 5W rms (60kV peak at 1mA). Under very high ...
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Is this a safe way to measure mains power on an oscilloscope?

I wanted to use my cheap battery powered single-channel oscilloscope or my Rigol 1054Z to see the 120V AC mains signal in my house. No particular reason, just curious. I at least knew enough to not ...
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1answer
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How long would a fully charged 230AH 12V battery last when using it with a 12V->230V DC>AC inverter, drawing an average of 1500 watts power?

This sort of battery. This sort of transformer. Powering a 1500Watt PA for how long, and how do you work out the AH when using a transformer? As best as I can figure out it would be something like: ...
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2answers
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Shared Transformer Grouding

I'm looking into creating positive square wave sharing same reference ground as primary on the secondary side of a transformer without using a rectifier. Assume that I have ability of providing the ...
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42 views

Transformers operating at certain frequency [duplicate]

In one of my previous questions some people commented that transformers are made to operate at certain AC frequencies. But why is that? I cannot understand the intuition behind it. Shouldn't more ...
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1answer
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Maximum power transfer of transformer [closed]

We have this transformer: simulate this circuit – Schematic created using CircuitLab The power transfered to R1 resistor is maximized when the frequency of the signal is very big.This means ...
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1answer
24 views

Power transfer in transformer

I just started network theory and stuck to this problem, in book it is written that an ideal transformer supplies constant power, so I randomly assume a question as shown in figure and try to find ...
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2answers
34 views

Transformer isolation and reference

For testing purposes, I need two circuits: 220Vac rectified and 48Vac rectified, both having the same reference, like this: But I don't have an isolated transformer 220V:220V. I only have an isolated ...
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1answer
34 views

Why are thyristors used in xenon trigger coil circuits?

Looking at the datasheet for the ZS1031-11(H) trigger coil, the test setup activates the trigger coil with a thyristor: In the datasheets for other trigger coils, and in other circuit diagrams online,...
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1answer
37 views

How am I supposed to interpret transformer value only given in impedance?

I am reading a definition where only the transformer impedance is given. 120kVA 0.023+0.041iohm Is this value for the primary side or secondary side? How would I ...
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33 views

Problems related to Zener Diodes to determine the ratio of transformer

I am having a problem which is related to a circuit as shown below: simulate this circuit – Schematic created using CircuitLab I will give you more information about this circuit. V1 in this ...
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3answers
944 views

What happens if the secondary of an ordinary transformer is left open?

Let's consider a transformer. The ideal transformer equation is: $$\frac{V_1}{V_2} = \frac{I_2}{I_1}$$ Suppose the secondary is open (that means \$I_2 = 0\$): it will result \$I_1 = 0\$. How is this ...
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56 views

Transformers on tv signals [closed]

Are transformers used in moving the AC signal from the antenna to the TV? I am asking this because the electromagnetic waves must hit the entire antenna for voltage to be produced . Also how some ...

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