schaltungsanordnung for monitoring demagnetization for a sperrwandler with primaerseitiger and secundaerseitiger regulation.

摘要

A switching power supply comprises a primary regulation system (CI3) and a secondary regulation system (CI2, CI1), supplying control signals (Pp, Ps) for a main switch (TP) and further comprises a comparison means (22), the output of which (Is) is set to "1" when the transformer (TA) of the switching current is demagnetized. A logic circuit (CL) receives the output signals (Is, Pp, Ps) and supplies on its output (25) a control signal (VS5) for the main switch (Tp) which can be set to "0" for the switching OFF of the main switch or to "1" for its switching ON, as a function of the following criteria: the control signal is set to "1" if the comparator output signal is set to "1", and if the output signal of at least one of the regulators is set to "1", and the control signal is set to "0" when the regulator output signal which has caused to control signal to be set to "1" is set to "0".