|Title of Invention
SWITCHED-MODE POWER SUPPLY
||A switched—mode power supply has a storage capacitor (Cl), a transformer (TR) with a primary winding and at least one secondary winding, and also a switching transistor (TI) which is connected in series with the primary winding. The primary winding is subdivided here into sub—windings (W1a, W1b) with at least one tap (A), and a capacitance (C1, C3) is in each case disposed in parallel with sub—windings, preferably with each sub- winding (W1a, W1b), as a damping network. The numbers at windinqs of the sub-windinqs and the capacitances of the capacitors disposed in parallel with the sub—windings are selected in such a way that the oscillations occurring when the switching transistor is deactivated have different resonant frequencies and thereby partially cancel each other out. This results in an effective damping of the deactivation voltage (U2) over the Switching transistor. Since the capacitors (C2, C3) are connected in series, the effective total capacitance is low, so that the resulting discharge current at the when the switching transistor (T1)becomes conductive comparably low.
445-cal-2001-granted-reply to examination report.pdf
445-cal-2001-granted-translated copy of priority document.pdf