Patent ID: 11923796
Assignee: FUTURE SYSTEMS BESITZ GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 23:
24. A method for protection of a load connected to an apparatus, the method comprising the steps of:
generating a first voltage drop (ΔU4) directly at a current rise speed sensor component corresponding to a current rise speed of an electrical current flowing via the current rise speed sensor component and a power switch to the load,
detecting an occurring overcurrent depending on the first voltage drop (ΔU4) generated by said current rise speed sensor component and a second voltage drop (ΔU5) along the power switch,
wherein the power switch is automatically switched off by a driver circuit operating independently from a control unit within a switch-off period of less than 1 millisecond if the first voltage drop (ΔU4) plus the second voltage drop (ΔU5) along the power switch applied as a sum voltage (UΣ) to an input of the driver circuit exceeds a threshold voltage (UTH),
wherein the control unit controls the driver circuit on reception of a control command from a user interface or from a remote device such that the power switch is switched either on or off in response to the received control command and wherein the control unit controls the driver circuit to switch off the power switch if a current profile of the electrical current, as measured by a load current measurement unit, indicates an overload state of the load.