Patent ID: 7023710

Claim:
A method of operating a switched-mode power supply, in particular a switched-mode power supply comprising at least one preconditioner functional unit, a switching stage with an open-and/or closed-loop control device, a voltage divider, which is arranged between the preconditioner function unit and the switching stage, in which an intermediate circuit voltage (Uic), provided by the voltage divider, is present between the preconditioner functional unit and the switching stage, and a voltage transformer, comprising: fixing a limit value (Ulimit) for the intermediate circuit voltage (Uic); monitoring the intermediate circuit voltage (Uic); comparing the intermediate circuit voltage (Uic) with the fixed limit value (Ulimit); and activating, by the open- and/or closed-loop control device, a burst cycle when the limit value (Ulimit) is reached for the intermediate circuit voltage (Uic) on a primary side of the voltage transformer.