felis said:
That's normal range for SMPS transformers - even iron powder core transformers would work and there is plenty of them for all kinds of currents. You need to figure out peak current through primary winding, winding inductance and turns ratio. Then look what's available (Coiltronics, Sumida) and recalculate - peak current depends on inductance so you can play with values here. Also you said your input is 12v - is it possible to change that to a higher voltage like 30-60v? It's easier to design this way and turns ratios of 1:3-1:4 are more common than 1:16.
THe peak current on the secondary winding is 62.5mA so the primary current peak is ideally x16 = 1A. THe output is 400Vpp (but it's centered on zero so the insulation requirement is only 200Vp). This peak current was calculated using the transducer capacitance and operating frequency that would produce the most current draw.
The problem with output voltages of 30V-60V is they far exceed the battery supplies, so what happens is then I need to get a "high"-voltage amplifier, in which case I might as well get a 200V or 400VDC converter and then build the whole thing without transformers- but then I run into problems of finding 50kHz-100kHz switches capable of withstanding that voltage. Also, if I use 12V I can use a bunch of simple gate drivers for the H-bridge since it is on the same scale as both the gate voltage and source-drain voltage.
On the other hand, if I do get a 60V DC converter I can still use MOSFET switches just fine, but then I'm stuck with using transformers AND step-up DC converters. I am trying to avoid having that many parts right now.
Regardless I still haven't come by an 200-400V insulated SMPS transformers but I will look at your sources.
Also, I have found out the bandwidth limitations of a transformer on the low-end are core size (since lower freqnuency is higher flux density) and on the high-end are the interwinding capacitances and core losses. Doesn't this mean I can buy a bunch of large cores and then wind them and *hope* the interwinding capacitance is small enough to not affect functionality and then test it out on a frequency generator? I'm not sure how I myself would minimize interwinding capacitance though? (Trying to side-step the whole equations stuff as much as possible). 50kHz-100kHz is really low though, I don't think interwinding capacitance would play a role at all since those are not realy high frequency relative to RF where all the problem seem to come in.
mvs sarma said:
if needed you can get some datasheet to rewind the same to meet your needs. it should not be difficult. But I have some doubt can t you manage with out any transformer? what is the make and model number of the transducer you are tryng to use?
THe transducer is this:
https://www.electro-tech-online.com/custompdfs/2007/12/60020environmental20spec.pdf
It's just realy nice to use a transformer since I can keep everything else low voltage which would make the circuit simpler and allow me to have more flexibility in parts.
From my understanding it shouldn't be technically difficult to make such a transformer since my requirements are so undemanding, I just can't seem to find the part. I don't even want it to be wideband really, since it would be preferable for the transformer to burn off the higher and lower frequencies outside of 50-100kHz to produce a more sinusoid output from my square wave input to reduce the stray noise sent out by the transducer.