Siemens Aktiengesellschaft

Markus Kogard

Lorand Cesnak

Harald Schweigert

Wolfgang Paul

Harald Kernstock

Silvan Czech

Lorand Cesnak Phd

Method for monitoring and controlling current distribution in load circuits of an installation control system of a technical installation, wherein a predetermined and constant output voltage is provided by a clocked power supply and distributed to the load circuits, where load circuits are protected by a switch actuated by a controller, a variation of the current in each load circuit is measured during a learning phase, a significant current profile with an associated tolerance range is derived and associated with the respective load circuit from the measured current variation which is continuously monitored by the control unit and a check is performed to determine whether a power capacity limit is reached by the clocked power supply while operate the installation, and the current consumed load circuits is reduced and/or switched off by actuating switches in load circuits in which a current variation exceeds an upper limit of the tolerance range.

Method for monitoring and controlling a current distribution in an installation

The invention relates to a method for operating an inverter comprising a step-up device which is upstream-connected by means of an intermediate circuit and is connectable to a direct-current source with a variable reference sampling current wherein said inverter and the step-up device are provided with an efficiency optimizing working area, respectively. When the variable reference sampling current is raised and the step-up device approaches a pulse duty factor value, the intermediate circuit voltage is reduced and the variable reference sampling current is stabilized, said intermediate circuit voltage is re-raised. When the direct-current source is in a permanent operational state, the inverter and the step-up device operate in the efficiency optimizing working area thereof, respectively.

Method for operating an inverter having a step-up device connected upstream

There is described a powering unit comprising at least one transformer, at least one full bridge circuit via which a primary winding of the transformer is connected to a direct current voltage input, a secondary winding for triggering an output circuit with an output direct current voltage via a bridge-type rectifier circuit as well as an output choke coil and an output capacitor, and a discharge circuit consisting a diode, for a capacitor and of a resistor for reducing the secondary-side peak voltages. The powering unit has another secondary winding, another bridge-type rectifier circuit and another discharge circuit operable to trigger the output circuit with part of the output direct current voltage via the output choke coil and the output capacitor. Thus, there are fewer losses in the resistors and the performance is enhanced.

Growing community of inventors

Hagenbrunn, Austria

Markus Kogard