Audio Tranformer

Audio transformer is working in the audio range transformer, also known as low frequency transformer. Work generally from 10 ~ 20000 hz frequency range. Used to transform voltage or transform the impedance of the load.

In radio communications, radio and television, as a voltage amplification in automatic control, power output of the circuit components such as. Audio transformer within the working frequency band frequency response even, its core is composed of high permeability materials piled up, the original, deputy winding coupled tightly, so almost all through the primary winding magnetic flux and vice winding chains, the coupling coefficient is close to 1. Passband of the lowest frequency determined by the original winding inductance, the highest frequency determined by the transformer leakage inductance.

To better audio transformer winding a performance will have to try to reduce the leakage inductance of the transformer to get larger primary coil number of turns at the same time, resulting in better frequency characteristics, but also reduce the distributed capacitance between lines and improve the high frequency, but the leakage inductance of the winding turns and line and contradiction of the capacitance between the three is a unified, turns the more the greater the leakage inductance of the distributed capacitance has, the greater the so audio transformer winding device on the choice of material is very exquisite, especially the core, we should try to choose high silicon steel sheet of magnetic flux density is larger for core, USES the shell structure in the structure, purpose is under the limited number of turns (to reduce the distributed capacitance) to increase the leakage inductance of the inductor and reduce as much as possible. In the low frequency end, due to the impedance is less, easy to make larger current through the coil magnetic core saturation caused by the low frequency characteristics, in order to avoid the iron core, the phenomenon of the magnetic saturation, plus the air gap between two core gaskets, of course this kind of practice at the cost of the leakage inductance of the increase as. Anyway to make an audio transformer in the core of material selection, air gap adjustment, design circle the number of how many reasonable trade-off.