| 摘要 |
This invention relates to a control circuit for the closed-loop control of an output voltage of a primary-controlled switched-mode power supply as well as an associated method. The switched-mode power supply comprises a primary-side switch and a transformer with at least one auxiliary winding in which an auxiliary voltage is induced after opening the primary-side switch. The voltage induced in the at least one auxiliary winding provides the basis for the measurement voltage passed to the control circuit and for the supply voltage of the control circuit. The invention also refers to an associated switched-mode power supply. In order to overcome the problems of known control circuits and to provide an improved control circuit for a primary-controlled switched-mode power supply, which can be constructed with increased control accuracy, but nevertheless with a small size and low component costs, the control circuit comprises a measurement voltage connection for connection to the measurement voltage and a supply voltage connection separate from same for connection to a supply voltage which is produced from the auxiliary voltage.
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