[[upsilon].sub.T] - vector of the turns ratio
of control transformers,
Therefore, a reliable control system is required to adjust the voltage of HVS with respect to the voltage of LVS of the converter so that the voltage ratio of the HVS with LVS is close to the transformer turns ratio
Beside the duty cycle another design factor is provided to enlarge the voltage gain in proportion to the winding turns ratio
. Thus the converter can easily attain high voltage gain;
Therefore, in this application the transformer turns ratio
has to be selected for the converter to operate with minimum duty cycle under these operating conditions.
With this circuit structure, it results in a large transformer turns ratio
, which makes the transformer design complex and leads to a large leakage inductance.
To illustrate the turns ratio
selection process, first consider the boost or step-up mode.
Megger, one of the world's leading manufacturers and suppliers of test equipment and measuring instruments for electrical power applications, now offers a rugged, handheld, battery-operated TTR tester (transformer turns ratio
For example, for high step-down voltage conversion, it requires a transformer with high turns ratio
or it has to reduce the duty ratio of the switches.
In addition, the lead set used with the MTO300 series instruments is the same as that used with Megger's three-phase transformer turns ratio
test sets, which makes it possible to perform both resistance and turns ratio
tests after making just one set of connections to the transformer.
The two transformers [T.sub.a] and [T.sub.b] with turns ratio
[N.sub.a] and [N.sub.b] transform the two edge impedances to the feed point ([x.sub.0], [y.sub.0]).
The ADSL line transformers, part numbers BX2258 and BX2358, have an inductance value of 5.0 milli henries and turns ratio
of 1:1 while part numbers BX2259 and BX2353, have an inductance value of 5.0 micro henries and turns ratio