Primary side clock single-ended forward converter with connectible secondary circuits and having switchable actual value feed for the output voltage control

摘要

A single-ended flow converter which is clocked at the primary winding side and which is provided with a controller and monitor and comprises a plurality of switched power packs that are connected by secondary windings and are each composed of an electronic switch, a storage inductor, a free wheeling diode and a smoothing capacitor for supplying power to a DC user. The flow converter is compact and has high efficiency and has at least one secondary winding (T3 III) which has a further switch power pack (2) associated to it such that one electronic switch (V19) has its storage inductor (L2a) connected to the end of one winding of the secondary winding (T3 III) and has a second electronic switch (V18) which has its storage inductor (L2b) connected at the other end of the secondary winding (T3 III) and at least one of the free wheeling diodes (V7, V8) and the smoothing capacitors (C4 and C5) have at least one terminal connected to ground. A second switch (K1) is connected between one end of the secondary winding (T3 III) and the end of one further secondary winding (T3 III). A changeover switch (K2) is actuated depending upon the second switch (K1) has its first switching contact connected via a resistor (R5) are connected via a second resistor (R6) at the voltage output of another of said power packs (3). The common contact of the switch (K2) is connected to ground through a third resistor (R9) and is connected to the input of the controller (RÜ).