Controlling external switching network stage enables constant voltage to be maintained, even during pulse or burst phase, without using large capacity capacitors - involves control unit switching on switching network stage if output voltage falls to predefined minimum value

摘要

The method involves a control unit (IC) switching on the switching network stage if the output voltage (Us) falls to a predefined minimum value. An a.c. voltage is applied to the a.c. input of a bridge rectifier (BR) with a parallel circuit of a first capacitor (C1) and a series circuit contg. the primary winding of a transformer (Tr) and a switch (T1) controlled by the control unit. The regulated output voltage is taken from a second capacitor (C2) in a series circuit with a diode (D1) that is in parallel with the transformer secondary.