Patent Number: 6,166,923

Title: Switched-mode power supply

Abstract: The switched-mode power supply comprises a secondary winding and four diodes for producing two rectified voltages of the same polarity, one of which can be regulated. A connection of the unregulated voltage has connected to it a variable Zener diode as an error amplifier for transmitting a regulating signal to the primary side. The driver stage provides a pulse-width-modulated square-wave signal for driving the switching transistor which is arranged at a high potential between the operating voltage on the input side and a first connection of the primary winding. The second connection of the primary winding is connected with a Zener diode and provides a stabilized voltage for the driver stage. Arranged between the driver stage and the control electrode of the switching transistor there is a differentiating element which produces positive and negative switching voltages for controlling the switching transistor.

Inventors: Rehm; Markus (Villingen-Schwenningen, DE), Riesle; Thomas (Vohrenbach, DE), Rilly; Gerard (Unterkirnach, DE), Rodriguez-Duran; Jose I. (Villingen-Schwenningen, DE)

Assignee: Deutsche Thomson-Brandt GmbH

International Classification: H02M 3/24 (20060101); H02M 3/338 (20060101); H02M 003/335 ()

Expiration Date: 12/26/2017