Patent ID: 6608768
Filing Date: 2003-08-19
Classification: H02M

Abstract:
A switched-mode power supply, comprising:a primary side and a secondary side, a transformer with a primary winding, a secondary winding and an auxiliary winding, of which the primary winding and the auxiliary winding are connected to the primary side and the secondary winding is connected to the secondary side, a switch element connected to the primary winding for interrupting a current flowing in the primary winding, a freely oscillating circuit for generating switching pulses to the switch element, a rectifying and charge storing coupling between the terminals of the auxiliary winding for generating an image voltage, which on the primary side represents a certain voltage of the secondary side, and a coupling from said rectifying and charge storing coupling to said freely oscillating circuit for controlling, on the basis of the value of said image voltage, how switching pulses are generated.