Circuit to determine input voltage of a primary clocked network with transformer separated input and output has test voltage unit connected to the transformer output

摘要

A circuit to determine the input voltage of a primary cloaked network whose input (UE) and output (UA) voltages are galvanically separated by a transformer (TX) comprises a voltage determination unit (SE) giving a test voltage (UT) connected to poles (P1,P2) of the secondary winding and at least one pole (BP) of the output voltage.