CONTROL CIRCUIT FOR REGULATING CURRENT FLOW THROUGH A LOAD

摘要

A regulator controls the DC current flowing through a load, where the current is initially supplied by an AC voltage source and thereafter rectified, the control being proportional to the load current. In one embodiment, the source-emitter potential of a transistor which functions as a control element is changed by means of a current source such that a current of predetermined strength flows through the control element transistor. The control current for the current source is derived from a current sensor in the load circuit. Additionally, a constant gate potential for the transistor control element is obtained through the current sensor. This circuit is preferably suitable for the regulation of the cathode current of travelling-wave tubes.