37 Threads found on edaboard.com: Transformer Design Formula
Any body can provide the total calculation on transformer design with PWM in push pull topology used in inverter circuit.
Example- input 12vdc output--220vac VA rating--500va freq. 50hz
How the transformer size reduces in inverter & UPS with E-I iron core.
When i calculate with conventional formula of (...)
Electronic Elementary Questions :: 14.04.2008 12:33 :: 1230 :: Replies: 0 :: Views: 1729
I need to know the toroidal transformer design calculation.
How to find core area?
How to find turn per volts? and etc.
Please give me a direction in this.
Power Electronics :: 02.02.2011 09:00 :: harii74 :: Replies: 13 :: Views: 6207
Yes this one turn is possible. Infact fractional turns are also possible. 100khz 0.18T is not reasonable. It should be 0.12T as the core will go into saturation during transients. As for my opinion, a push pull transformer should work with open second
Power Electronics :: 13.06.2011 00:57 :: u04f061 :: Replies: 2 :: Views: 1483
I'm interested in
1. How to calculate Coil Turns.
2. How to Select SWG ( Wire Guage )
3. Ferrite / CRGO ( E-I ) Core selection.
Finally how to design transformer and Inductors.
Added after 1 hours 49 minutes:
For transferomer I found a
Electromagnetic Design and Simulation :: 01.04.2006 11:54 :: nandi_ranjan :: Replies: 6 :: Views: 2401
Do anybody idea about the transformer design? How to calculate the diameter of the wire for power supply trasformer? what about the number of turn and the size of the core? Does the quality of the core effect the voltage induced in the secondary side. What are the losses in the trasformer and which one is very critical?
Electronic Elementary Questions :: 20.06.2007 08:17 :: zio_nneo :: Replies: 5 :: Views: 1683
Is anybody knows about how to design the forward converter transformer using used smps transformer without knowing transformer data?. I have used 350 Watts ATX power supply, I need to redesign the transformer to output DC 5V 50A. Is it possible without knowing the (...)
Analog Circuit Design :: 12.07.2007 03:21 :: rudypb :: Replies: 5 :: Views: 2618
I think Picstudent is talking about flyback transformer.
Hope someone here can explain the most reasonalbe design for flyback transformer.
The question can be more exact if we take 5V/1A output design as an example.
Added after 2 minutes:
Here is some starting point as I know:
Analog Circuit Design :: 27.07.2007 03:07 :: hardings :: Replies: 3 :: Views: 19053
For designing power transformers using CRGO and low cost core, normally we use some simple formula which relates transformer cross sectional area, core permeability and some turns/volt etc. Such simple calculations are practically sufficient for our purpose.
Just like that is there any easy method for claculating (...)
Microcontrollers :: 27.07.2007 01:28 :: UroBoros :: Replies: 4 :: Views: 3548
Vp/Vs = Ip/Is
Np/Ns = Vs/Vp
Unfortunately both "formulas" are wrong.
A converter with variable input voltage and intended constant output must involve a method of voltage regulation, either by PWM at the primary or a separate secondary switcher. The selection of a suitable converter topology also affects the transformer dimensio
Power Electronics :: 24.11.2010 01:42 :: FvM :: Replies: 6 :: Views: 2244
I Suggest you Read my article on transformer cores and determining Inductance Values.
Analog Circuit Design :: 28.05.2012 18:22 :: chemelec :: Replies: 76 :: Views: 8530
I need primary and secondary winding formulas for the following transformers,
(1) ETD 29,34,44,49.
(3)RM 10,12_small big.
Professional Hardware and Electronics Design :: 22.02.2012 06:06 :: billu8660 :: Replies: 8 :: Views: 1944
How do i caclculate the area needed for a ferrite transformer , knowing the power needed ? Is there a formula ?
the design of a ferrite transformer is a trade-off, there isn't a direct relation between core cross section area and output power. A good starting point could be the application notes that you can find at this l
Electronic Elementary Questions :: 31.05.2006 14:23 :: stefano.delfiore :: Replies: 7 :: Views: 11304
I have a question regarding this article 'A General design formula of multi-section Power Divider Based on Singly Terminated Filter design Theory' on wilkinson power divider design.
Let's take a 4-section power divider just for verifying the formulas.First, I got the impedance of optimum (...)
RF, Microwave, Antennas and Optics :: 01.03.2007 18:12 :: alard :: Replies: 4 :: Views: 2213
Have a question about transformer calculation for half-bridge topology.
Want to say that I am not experienced in transformer calculation.
I need to design a transformer which should feed the purely resistive load with 850VAC, 60khz. The power of the transformer should be 55W. I have chosen a core (...)
Analog Circuit Design :: 27.03.2007 14:50 :: belax :: Replies: 0 :: Views: 1016
I am looking for a software to calculate simple coils and transformers?
Can someone give me some names or links?
Electronic Elementary Questions :: 16.06.2008 10:42 :: tronoty :: Replies: 4 :: Views: 4112
How do we choose the wire gauge in SMPS transformer.
I know the skin depth formula but I would like to design, let said a transformer operating at 500Khz with 6A output, the formula give me a wire AWG 30 (Rac=Rdc)
according to each wire support 0,14 A it mean that I need 43 wire ... Is that right ? Is
Analog Circuit Design :: 01.10.2008 20:48 :: sec :: Replies: 6 :: Views: 4172
The said expression is an empirical formula, that is fitted to measurements rather than calculated. There are various similar
formulas in use. As ferrite manufacturer application notes clarify, the parameters depend both on material and core shape.
I would generally suggest to use the manufacturer provided design tools for (...)
Analog Circuit Design :: 02.01.2010 05:18 :: FvM :: Replies: 5 :: Views: 2334
I'd like to design a diode detector with square-law characteristics and I need to how to design it? As I know from its basic circuit that it consists of impedance transformer, RF choke, diode and bypass capacitor. I need to know how to calculate the input impedance of diode to design the impedance (...)
RF, Microwave, Antennas and Optics :: 01.03.2010 06:33 :: raed_microwave :: Replies: 3 :: Views: 2204
Am new to this antenna design, am a student and i have not much clear exposure in this field. It would be very grateful, if anyone can guide me in the following design using FEKO.
Frequency is 4.25Ghz,
a)i have to design a pin fed patch antenna with ‘air substrate’ to work with a 50 Ohm co-ax feed of wire radius (...)
RF, Microwave, Antennas and Optics :: 10.05.2010 07:20 :: sbalajichennai23 :: Replies: 1 :: Views: 900
i want to design ferrite core transformer.
Anyboddy can help me in design pls tell me wats the formula here to find area, primary winding and secondary winding.. voltage and current....
Power Electronics :: 19.05.2010 06:01 :: Zeshee :: Replies: 1 :: Views: 1270
I'm using a microstrip quarter wave transformer with an open end connected to a short stub(part of impedance matching for a transistor).
As far as I know a wider microstrip(smaller Z0) for the transformer would result in better bandwidth. However I cannot understand why!
Can you help me with understanding the connection between the
RF, Microwave, Antennas and Optics :: 11.08.2010 09:22 :: n3x :: Replies: 1 :: Views: 864
Number of turns depends on specified windings voltage, frequency, core crosssection and allowed core flux, not transmitted power. For a 50 Hz transformer with iron core, you have typically n= 42*V/A, V is voltage A is crosssection in square cm.
Power Electronics :: 05.06.2011 08:24 :: FvM :: Replies: 3 :: Views: 529
One way to decide your primary inductance should be such that you magnetizing current is <5% of max load current. But this is not a golden rule. In reality i believe for 50Hz transformer it would be primarily driven by no of turns needed to hold-of voltage in primary
Power Electronics :: 22.09.2011 09:31 :: atripathi :: Replies: 5 :: Views: 1403
thanx before KB6NU, for the reply,
i'm using a ferrite core for the balun but i don't know about mu, can u give some valid reference for what kind of ferrite for mu, that suitable for VHF frequency and i need formula for the winding ratio of balun, can u give some valid reference for that too because i got a lot of reference b
RF, Microwave, Antennas and Optics :: 04.10.2011 23:31 :: enjunear :: Replies: 7 :: Views: 839
hello sir, i am doing engg. i want basics concept to design unregulated power supply circuit i know the component i need but when i draw schematics digram i have no idea. how to calculate ,what formula i need?
how can i chose rating of component
transformer- power rating (...)
Microcontrollers :: 29.11.2011 11:05 :: vead :: Replies: 1 :: Views: 204
I assume this is an offline design.
i can have a frequency between 29Khz to 200Khz
You're referring to a range of possible frequencies you want to try, right? You're going to have a fixed frequency during operating and try different frequencies. Isn't that right? Or do you intend to alter the frequency during the circuit operation o
Analog Circuit Design :: 30.05.2012 07:06 :: Tahmid :: Replies: 5 :: Views: 370
The formulas are different.
It has something to do with a 50 % duty cycle (or close to it) being desirable in a coupled inductor boost converter.
It is because it is a different inductance through which the flux field collapses, from the inductance through which it grew.
And at a different turns ratio.
Hence the transformer primary is calculated
Hobby Circuits and Small Projects Problems :: 21.05.2013 04:08 :: BradtheRad :: Replies: 4 :: Views: 298
I have to design a 40 Watt Flyback transformer.
1. Primary 230 VAC
2. Secondary 12 Volt
3. Pout = 40 Watt
4. Creepage distance = 6.4 mm
5. Primary inductance = 500 uH
6. Secondary winding = sandwhiched inside the 2 primary halves
Which core is best to keep the Leakage inductance below 1
Power Electronics :: 20.06.2013 03:32 :: edaenrico :: Replies: 5 :: Views: 272
I would like to use an offline PFC flyback controller that operates in critical/boundary conduction mode.
I am stuck in trying to figure out what my magnetizing inductance Lm for my flyback transformer should be! The datasheet only recommends part numbers, but I would like to know how they f
Power Electronics :: 27.08.2013 18:02 :: AlienCircuits :: Replies: 4 :: Views: 272
I am trying to design a 1 Amp power supply, it is going to use center tapped transformer, i need to choose the diode with correct characteristics for a full wave rectifier. I have problem with Ifav or forward average current during conduction. The formula given in the book(microelectronic circuits by sedra and smith) is
Iav = (...)
Analog Circuit Design :: 04.10.2005 18:44 :: Lucifre :: Replies: 5 :: Views: 710
Snubber dimensioning depends on transformer stray inductance. A design criterion could be a from maximum overvoltage at the MOSFET. As power MOSFET usually have the ability to absorb overvoltage in normal operation, it must not be absolutely necessary. If not knowing stray inductance values by design, empirical dimensioning is probably most (...)
Hobby Circuits and Small Projects Problems :: 29.02.2008 02:29 :: FvM :: Replies: 5 :: Views: 7977
Hi everyone, I am planning to build an Inverter with a step up DC-DC stage switching at 20KHz coupled to the Inverter stage directly without an High frequency transformer. After the Inverter stage I intended to filter the resulting mid voltage range PWM output and use a 60 HZ power transformer to step up the ouput to 230v(note the inverter stage
Hobby Circuits and Small Projects Problems :: 17.07.2008 07:37 :: babinton :: Replies: 20 :: Views: 8444
The input impedance of a transmission line of length l terminated with load ZL is given by:
the λ/4 line is known as the quarter-wave transformer and the input impedance of this line is given by (letting l=λ/4 in the above formula) :
RF, Microwave, Antennas and Optics :: 02.12.2010 05:20 :: amihomo :: Replies: 7 :: Views: 2318
i will go check it first.
Do u know how to calculate the impedance of loop array or dipole array? and the feed line impedance for loop and dipole ?
For normal dipole array, what will be the impedance variation within a frequency range? I need to add a balun and impedance transformer to tune it to 50 ohm.
I can simulate the result but
RF, Microwave, Antennas and Optics :: 22.01.2011 01:39 :: long88 :: Replies: 2 :: Views: 584
As pic deals with 5v so you need to step down your voltage to 5v by using transformer.
Use two analog pins for seperate mode (AC and DC).
use a formula in the pic in such a way that if you get 5v input at analog pins it shows you 440v.
use the higher resolution of adc for accurate readings.
hope this would helps you making the theme
Microcontrollers :: 26.05.2011 01:52 :: cool.man :: Replies: 6 :: Views: 1644
Impedance matching by inserting a transmission line with different Zo is not much different compared to conventional stub matching.
A special case is for quarter wave length, were the inserted impedance can be seen as a mirroring point in a smith diagram as Zx= √(Zin?Zout)
RF, Microwave, Antennas and Optics :: 18.10.2011 18:08 :: E Kafeman :: Replies: 6 :: Views: 828
Do you have feedback on your design?
If you don't have feedback for controlling switch then you don't hope that your output will be stable (it is depended to it's power, if you consume high current your voltage drop P=V*I).
Also I think it will be dependent to your device specifications.
If you had feedback then it try to modify and correct y
Analog IC Design and Layout :: 10.05.2012 01:05 :: dv_sa559 :: Replies: 3 :: Views: 258