1000:1 step up transformer frequency - Page 1
Forum section: electronics / beginners

author: robowaffe
author_rank: Regular Contributor
timestamp: July 27, 2023, 09:37:51 am
content: so as far as i can tell now, step up transformers take more wire to make than a 1:1 isolation transformer.that means they have more henrys and more load than 1:1 transformers?so when someone is talking about a high frequency step up transformer like this->10kv.https://www.aliexpress.com/item/1005002038574313.html?pdp_npi=2%40dis%21AUD%21AU%240.60%21AU%240.51%21%21%21%21%21%402101c5c216904506568384363eba10%2112000018505117655%21btf&_t=pvid:74f2abb1-59c4-4d6b-afbb-6e11e112965f&afTraceInfo=1005002038574313__pc__pcBridgePPC__xxxxxx__1690450657&spm=a2g0o.ppclist.product.mainProductIve got 3 questions.* what is the dc resistance of its coils* what is the henry's* what is this frequency probably going to be?

author: Manul
author_rank: Super Contributor
timestamp: July 27, 2023, 11:41:17 am
content: 1 & 2 is impossible to tell. You either read manufacturer's datasheet or buy this transformer and measure yourself.3. The frequency will be whatever you choose it to be. Theoretically you can drive the transformer at any frequency you like. Practically the core material and construction of the transformer defines optimal frequency range where efficiency will be highest. Much lower or much higher frequency will make a transformer to not function as intended. Judging from the picture this one is likely intended to work at around 10's of kHz.

author: Terry Bites
author_rank: Super Contributor
timestamp: July 27, 2023, 12:44:02 pm
content: I dont think that you have fully understood how transfomers work. How the Magnetic flux created in the primary couples via the magnetic circuit into the secondary. Indcutance is not a parameter your aimaing at. Once you have established the ratio, you need to determine the flux density (B). Then you design a core that will operate at the peak flux density.The primary and secondary in a step up transformer will have different indcutances.When a simple transformer is under load the net inductance is essentally zero.All the flux from the primary "indcutance" is coupled into the secondary indcutance.Some transfomers are designed so that the coupling factor (k) is somewhat less than unity.This creates extra inductance- these areoften refered to as leakage transformer. They were very popular in lighting circuits. Step up and balast all in one lump.The number of turns is determined by the flux density you want to create in the magnetic circuit.If you dont know what that number is, or anything about the frequency, core dimensions or material its impossible to say.Tutorial attached.

author: robowaffe
author_rank: Regular Contributor
timestamp: July 27, 2023, 01:41:47 pm
content: Thanks for the toot, I'm reading it now.isnt the frequency of the transformer dependant on its henry's?and isnt the number of winds increasing the henry's?

author: CaptDon
author_rank: Super Contributor
timestamp: July 29, 2023, 12:49:37 am
content: It is nearly impossible to answer your ambiguous questions here. Just go googling about the internet and learn about transformers and inductors from companies that specialize in building them and have online guides for choosing materials and doing calculations. Using iron wire would NOT produce more inductance in a given core vs. copper wire. It would produce large inefficiencies and most likely wasted heat energy.

author: Zero999
author_rank: Super Contributor
timestamp: July 29, 2023, 10:01:59 am
content: Quote from: robowaffe on July 27, 2023, 09:37:51 amWhat gives you that idea?Two transformers, of the same power rating and frequency, typically have similar quantities of copper and iron.A step-up transformer boosts the voltage and reduces the current.A step-down transformer boosts the current and reduces the voltage.An isolation transformer theoretically has the same current in the primary and secondary windings. In reality, there's some loss, so it's not perfect, but don't worry about it at this stage.The higher the current, the thicker the wire needs to be. A step-up transformer will have thinner wire on the secondary winding than the primary. An isolation transformer will have the same thickness wire on both the primary and secondary.

author: robowaffe
author_rank: Regular Contributor
timestamp: July 29, 2023, 10:12:18 am
content: I think that because a step up transformer has asymmetrical windings so it ends needing more wire, but I dont know for sure.But I spose if one wire is thicker than the other I guess it would balance out.

author: Zero999
author_rank: Super Contributor
timestamp: July 29, 2023, 10:14:23 am
content: Quote from: robowaffe on July 29, 2023, 10:12:18 amIt doesn't need such thicker wire on the secondary, because it reduces the current. I added a bit more to my previous post, because I left out that part.