impedance matching transformer

[masudasim]

Hi all

I have a QSC audio amplifier (RMX 4050HD) and an acoustic transducer having input impedance of approx 180 oham at resonant frequency. QSC amplifier can provide about 2000 watt to 2 oham load (speaker) . If i directly connect transducer to amplifier, i only get 50-60 watt output. I require atleast 600-700 watt power so i need a matching transformer (probably step-up transformer) b/w transducer and amplifier.

Can any one kindly suggest charecteristic parameters (e.g. winding ,core , insulation etc) of transformer most suitable for my application?
Is there any software availavle for design of such transformers?Most software available on net are for RF matching transformers

Note:My operational frequency band is about 3-5 KHz

Best Regards

 

[FvM]

You'll get the fourfold output power by operating the amplifier in bridge instead of parallel mono mode. For higher power, a step-up transformer is required. You can e.g. dimension the transformer for a minimal frequency of 1 kHz, resulting in a factor 20 reduction of windings count compared to 50 Hz and respectively higher power with a small core. According to the high output voltage of the transfomer, a layer insulation is suggested. For audio applications, tranformer calculation is basically similar to a low frequency (mains) transformers, there have been various contributions at edaboard related to it, see e.g. https://www.edaboard.com/threads/214708/

 

[masudasim]

Thanks for your helρ. As i have to oρerate two transducers from single ρoweramlifier, i have to use it in parallel mono mode.

>>dimension the transformer for a minimal frequency of 1 kHz, resulting in a factor 20 reduction of
>>windings count compared to 50 Hz and respectively higher power with a small core

Can you kindly exρlain the relation bw winding count and frequency and also with core size

Best Regards

 

[FvM]

The relation between winding count, frequency and core cross section is set by the maximum flux for a given magnetic material. Windings per volt is inversely proportional to frequency and cross section. Increasing losses demand a slightly lower flux at higher frequency.