Siemens Aktiengesellschaft

Janusz Dyszewski

Stefan Reschenauer

Karl Benesch

Stefan Schulz

Andreas Emberger

A switching power supply (switched-mode power device) includes a rectifier for a mains connection and for rectifying a three-phase AC voltage, a first converter and a second converter, the input voltage of which forms an intermediate circuit voltage, where the first converter regulates the intermediate circuit voltage such that the voltage substantially corresponds to a predefinable output voltage of the second converter multiplied by a load-independent transformation ratio on operation of the second converter with a resonant frequency, where upon forced reduction of the output voltage from the second converter, the first converter can set an, on average, sufficiently low intermediate circuit voltage such that the second converter can be operated substantially with the resonant frequency for a load-independent transformation ratio, where a signal for closed-loop control of the first converter stage can be derived from voltage and/or current information from the second converter.

Switching power supply with resonant converter

A switching converter includes a transformer having a primary winding to which an input voltage is supplied and formed of two primary winding halves, a tap between the winding halves, and a pair of switching elements in series connection with the winding halves. A voltage divider formed of two capacitors and across which the input voltage is supplied is connected at a center tap between the two capacitors to the primary winding tap through a damping element or network. Each switching element is connected through a respective driver to a controller that operatively effects synchronous control of the switching elements.

Switching converter having a primary winding divided into a first partial winding and a second partial winding with a tap arranged therebetween

An activation circuit for activating a power bridge circuit of a resonance converter, including an inductive activation transformer that transfers a pulsed control signal generated via a CMOS driver to the power bridge circuit, wherein a clamping circuit is arranged at the output of each CMOS driver, where the clamping circuit clamps a primary winding of the activation transformer to a ground potential during the dead time between two pulses of the pulsed control signal such that overvoltages, which otherwise arise when switching the activation transformer inductance, are thus clamped during a dead time and a circuit breaker switches off securely.

Growing community of inventors

Vienna, Austria

Janusz Dyszewski