Fronius International Gmbh

Fronius Schweissmaschinen Produktion Gmbh & Co. Kg

Hubert Aigner

Friedrich Oberzaucher

Walter Pammer

Alfred Hiesmayr

The invention describes a method of controlling a welding current source () having a resonant circuit (), whereby a bridge circuit () is controlled by a control system (). A consumer, in particular a welding process, is supplied with energy via the bridge circuit () from a power source (). In order to control the individual switching elements () of the bridge circuit (), fixed pre-set control states Sto Sare stored and, during normal operation, the bridge circuit () is controlled on the basis of the control states Sto Sone after the other. If a change in resistance occurs at the consumer, the control system () switches to a special operating mode at the resonance frequency of the resonant circuit () and the bridge circuit () is controlled on the basis of the stored control states in order to run the special operating mode.

Method for regulating and/or controlling a welding current source with a resonance circuit

The invention relates to a voltage switching device ( ) consisting of a power rectifier ( ), a boost chopper ( ) having at least one storage element ( ), a transformer ( ), a switching device ( ), a control device ( ) and a plurality of mains leads ( to ), the power rectifier ( ) being connected to an energy source ( ) by the mains leads ( to ) and a consumer ( ) with a secondary winding ( ) of the transformer ( ), a power evaluating device ( ) supplied with voltage from the energy source ( ) being provided, the output of which is connected to the switching device ( ) or to the control device ( ). A boost chopper ( ) is provided respectively in a positive and a negative supply line ( ) from the power rectifier ( ), the storage elements ( ) provided in the boost choppers ( ) each being connected independently of one another to a respective high frequency inverter ( ), the high frequency inverters ( ) being connected respectively to a primary winding ( ) of one or more transformers ( ).

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Taufkirchen/Trattnach, Austria

Hubert Aigner