Primary-controlled SMPS with adjustable switching frequency...

Details Primary-controlled SMPS with adjustable switching frequency... Primary-controlled SMPS with adjustable switching frequency...

2007-11-13

2007-11-13

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021160, C363S097000

Reexamination Certificate

active

11099228

ABSTRACT:
The present invention relates to a method for controlling the output voltage of a primary-controlled switched-mode power supply unit having a primary-side switch and a transformer with an auxiliary winding in which an auxiliary voltage which images the output voltage is induced after the primary-side switch is opened. The voltage induced in the auxiliary winding is fed to a control circuit as the control variable. The present invention also relates to a control circuit for performing such a control method and to an associated switched-mode power supply unit. To adjust the output voltage and the output current in the simplest and most economical way while minimizing the cost of the components needed, the switching frequency of the primary-side switch is so adjusted in dependence on the auxiliary voltage in the present invention that the output voltage and the output current of the switched-mode power supply unit adopt values in accordance with a predetermined output characteristic. This may be a linear output characteristic.

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