Patent ID: 9343981
Filing Date: 2016-05-17
CPC Classification: H02M

Claim Text:
1. A control circuit for a switched-mode power supply transformer having at least one primary winding which is switchable using a power switch, at least one first secondary winding for generating an electrical output voltage for operating an electrical consumer, and at least one second secondary winding for generating at least one electrical auxiliary voltage, the control circuit comprising: a control unit configured to predefine a first amplitude of the output voltage, and to predefine a second amplitude of the auxiliary voltage; a first voltage limiting control loop configured to adjust the first amplitude; and a second voltage limiting control loop configured to adjust the second voltage to at least reduce an energy feed assigned to an operation of the control circuit from the primary winding to the secondary windings in a standby mode of the control circuit; wherein the first voltage limiting control loop includes a first voltage regulator to adjust the first amplitude, and the second voltage limiting control loop includes a second voltage regulator to adjust the auxiliary amplitude, wherein the second voltage regulator includes an LED and wherein the LED is connected to an optocoupler.