| 摘要 |
<p>The convertor comprises a primary winding (1) having a central terminal (10) powered by an unstabilised DC voltage (Va), a reaction winding (11) and a secondary winding (3) coiled on a magnetic core (2), two transistors (T1,T2) and a regulating circuit comprising means (21) of sampling and rectifying the voltage across the terminals of the primary winding, means (27) for supplying an attenuating voltage from the sampled and rectified voltage, means (15a, 15b) of comparison and of amplification for comparing a reference voltage (25) and the attenuated voltage, and for amplifying the resulting error voltage, and means (13) for triggering the converter, in order to constitute a load for the amplifying means so as to force the said transistors to behave like variable resistors and in order to vary the gain of the regulating circuit as a function of the frequency, the gain being fixed by these triggering means. The regulating circuit constructed in this way allows control right inside the operating period of the converter. <IMAGE></p> |
