Switch power source and method for controlling a switch in a switch power source

Application Number: 00106935
Application Date: 2000.04.21
Publication Number: 1271205
Publication Date: 2000.10.25
Priority Information: 1999/4/21 DE 19918041.5
International: H02M3/335
Applicant(s) Name: Infineon Tech. Corp.
Inventor(s) Name: M. Fildmiler
Patent Agency Code: 72001
Patent Agent: zheng lizhu
Abstract A switched-mode power supply with a switch for applying a supply voltage to a primary coil of a transformer based on the criterion of a drive signal. A pulse-width modulator has supplied a first regulating signal that is dependent on an output voltage and a first current signal that is dependent on a voltage through the primary coil for providing the drive signal. A second regulating signal that is variable in dependency on the current through the primary coil is also supplied to the pulse-width modulator . A method is provided for driving the switch in a switched-mode power supply.