Einrichtung mit einem Gleichspannungswandler für den Schaltbetrieb

摘要

In a starting phase, d.c.-d.c. converters (GW) are often operated in a current limiting mode; i.e, the pulse frequency for the switching members (S1, S2) is varied in such a way that the input current remains contant. The pulse frequency is then usually higher than in normal operation. When in such d.c.-d.c. converters a preferably constant operation frequency must be switched, switching is carried out by means of a clock-generator (FG) within a predetermined phase tolerance range (PB) with phase synchronism (CPV). The invention has in particular the advantage that a pre-regulator (VR) which is also working in a switching mode may be easily synchronised with the d.c.-d.c. converter (GW).