Quantcast Turns Ratio

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TRANSFORMER THEORY Transformers Turns Ratio Each winding of a  transformer contains a certain  number of turns of wire.   The  turns ratio  is defined as the ratio of turns of wire in the primary winding to the number of turns of wire in the secondary winding.   Turns ratio can be expressed using Equation (13-1). (13-1) Turns  ratio NP NS where NP  =   number of turns on the primary coil NS  =   number of turns on the secondary coil The  coil  of  a  transformer  that  is  energized  from  an  AC  source  is  called  the  primary  winding (coil), and the coil that delivers this AC to the load is called the secondary winding (coil) (Figure 1). Impedance Ratio Maximum  power  is  transferred  from  one  circuit  to  another  through  a  transformer  when  the impedances are equal, or matched.  A transformer winding constructed with a definite turns ratio can  perform  an  impedance  matching  function.     The  turns  ratio  will  establish  the  proper relationship between the primary and secondary winding impedances.  The ratio between the two impedances is referred to as the impedance ratio and is expressed by using Equation (13-2). (13-2) NP NS 2 ZP ZS Another way to express the impedance ratio is to take the square root of both sides of Equation (13-2).   This puts the ratio in terms of the turns ratio, which is always given for a transformer. 0 where NP  =    number of turns in the primary NS  =    number of turns in the secondary ZP   =    impedance of primary ZS   =    impedance of secondary ES-13 Page 2 Rev. 0


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