Transistor switching circuit for DC output stage - has galvanic separation between input stage providing control signal and output stage

摘要

The transistor switching circuit responds to a control signal provided by an input stage (1, 2) and supplied to the output stage (3, 4) via a coupler (5) providing galvic separation between the input and output stages (1, 2; 3, 4). The coupler (5) comprises a DC/DC converter coupled on its input side (7) to the terminals (E1, GND; E2, GND) of the input stage (1, 2) and on its output side (8) to the power supply for the switching transistor (10). USE - For switching electromagnetic setting element etc.