System of decoupling a decoupling current from a load current and adapted to obtain a controlled variable to control the load curent

摘要

The device provides a tap--off current from the current through a load, e.g. a television tube deflection coil, or a motor winding, used for regulation of the load current, via a tap-off resistance (4) and a tap-off current reflector (9,10,11), with the tap-off current obtained from the emitters of 2 output transistors (10,11) of the tap-off current reflector. The tap-off current is combined with a reference current provided by a reference current bank (12), the collector currents of the output transistors fed to 2 current reflectors (23,27), a further current reflector (28) receiving a reference current from the reference current bank. The regulation value is obtained from the difference between the voltage drops across a pair of resistors (35,36) associated with the current reflectors.