Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Helmut Haeusser-Boehm

Michael Schaller

Felix Franck

Joachim Muehlschlegel

The present invention relates to a self-locking circuit arrangement having an input voltage connection for applying an input voltage (UE), an output voltage connection for providing an output voltage (UA), a supply voltage connection for connecting a supply voltage (UV), a first switching element (T ) having a first and a second output connection and a control connection, a second switching element (T ) having a first and a second output connection and a control connection, where the first output connection of the first switching element (T ) is connected to the output voltage connection, the second output connection of the first switching element (T ) is connected to a reference-ground potential, the first output connection of the second switching element (T ) and also the control connection of the first switching element (T ) are connected to the input voltage connection, the second output connection of the second switching element (T ) is connected to the reference-ground potential, and the control connection of the second switching element (T ) is connected to the output voltage connection.

Self-locking circuit arrangement

The present invention relates to a synchronous rectifier circuit having a transformer (&Uuml;) in single-phase center-tap connection. MOSFETs containing a body diode are used as switches. The MOSFETs are connected up in such a way that a current flows only from source to drain. The channel of the MOSFETs is always switched on if current would flow through the body diode.

Synchronous rectifier circuit

Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation which leads to cross currents. This destruction mechanism is suppressed by specifically discharging a starting capacitor.

Electronic transformer with good immunity against high-voltage pulses

Circuit arrangement for controlling an analog voltage signal comprising an input connection for applying the analog voltage signal (UE), a digitizer unit ( ) which uses the analog voltage signal (UE) to produce a digital signal (UED) which has a predetermined duty ratio when the analog voltage signal (UE) is at a nominal value, a PI regulator ( ) to which, as the input signal, a nominal signal (USD) and an actual signal which is correlated with the digital signal (UED) can be supplied and at whose output a control signal (UST) for controlling the analog voltage signal (UE) can be produced, in such a manner that the control signal (UST) allows the analog voltage signal to be increased if the duty ratio is less than the predetermined duty ratio, allows the analog voltage signal to remain unchanged if the duty ratio corresponds to the predetermined duty ratio, and allows the analog voltage signal to be reduced if the duty ratio is greater than the predetermined duty ratio.

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Munich, Germany

Helmut Haeusser-Boehm