Patent ID: 6366036
Filing Date: 2002-04-02
Classification: G05F

Abstract:
An arrangement for coupling out an output current from a load current by a load (2), particularly a deflection coil of a cathode ray tube by means of an output resistor (4), which arrangement comprises an output current mirror (9, 10, 11), in which a control value in the form of the difference between two voltages dropping across two resistors (35, 36) for controlling the load current is generated and in which a reference current bank (12) is provided with a current mirror circuit whose input receives a constant current for generating constant currents, characterized in that the output current is coupled to the emitter of at least a first output transistor (10) and at least a second output transistor (11) of the output current mirror, in that the reference current bank (12) supplies a first reference current which, together with the output current, is coupled to the emitter of the first output transistor (10) and the second output transistor (11) of the output current mirror, in that the current through the collector of the first output transistor (10) of the output current mirror is coupled to the input of a first current mirror (23), in that the output current of the first current mirror (23) is coupled to the collector of at least one input transistor (9) of the output current mirror, in that a second current mirror (27) is provided to whose input the current through the collector of the second output transistor (11) of the output current mirror is coupled and whose output current is coupled to a first resistor (35), in that a third current mirror (28) is provided to whose input a second reference current from the reference current bank (12) is coupled and whose output current is coupled to a second resistor (36), in that the input transistor (9) of the output current mirror has the same emitter area as that of the first output transistor (10), and in that the difference between the voltages dropping across the first resistor (35) and the second resistor (36) represents the control value.