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Lorch Schweisstechnik GmbH
| Lorch Schweisstechnik GmbH Patent applications | ||
| Patent application number | Title | Published |
|---|---|---|
| 20100193488 | Method for regulating a welding current source and welding current source for carrying out the method - The invention relates to a method for regulating a welding current source with a current transformer, which has a series resonant circuit on the primary side and a parallel resonant circuit on the secondary side, the series resonant circuit being supplied with a variable alternating voltage by a bridge circuit and the parallel resonant circuit providing energy to a welding process by way of a rectifier, and a control unit controlling the bridge circuit in dependence on at least one state variable of the welding current source. In order to develop the method in such a way as to make regulation possible at low cost and with as little power loss as possible, it is proposed according to the invention that only the primary current or a state variable on the primary side corresponding to the primary current is recorded as the electrical-current state variable of the welding current source and a control signal dependent on the primary current or on the state variable corresponding thereto is fed to the control unit. A welding current source for carrying out the method is also proposed. | 08-05-2010 |
| 20100133249 | Method and device for controlling a power source and power source having such a device - The invention relates to a method for controlling the power source of a welding, cutting or plasma coating system, wherein the power source comprises a measuring part and a controllable clocked power part and wherein a measure value, which represents a measure of a characteristic variable, that is to be controlled, of the power part, is determined by means of the measuring part, and wherein the measure value is used for controlling the power part. In order to develop the method in such a way that a measure of the characteristic variable to be controlled can be determined within a short time, it is proposed according to the invention that a measured variable correlating with the characteristic variable to be controlled of the power part is at least approximately integrated starting from a prescribed initial value over a prescribed integration time, the duration of which corresponds to one or more clock periods of the clocked power part, and the measure value is determined from the integration value obtained in this way, and that this process is continuously repeated. A device for carrying out the method and a power source having such a device are also proposed. | 06-03-2010 |