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

Claim 0:
1. An apparatus for protection of a load connected to said apparatus, said apparatus comprising:
a power switch through which the connected load receives an electrical current;
a current rise speed sensor component connected in series with said power switch and configured to generate directly a first electrical voltage drop (ΔU4) corresponding to a current rise speed of the electrical current flowing via the current rise speed sensor component and via the power switch to the connected load; and
a driver circuit configured to detect 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 and to switch off the power switch upon detection of an overcurrent within a switch-off period of less than 1 millisecond to protect said power switch and the connected load,
wherein the first voltage drop (ΔU4) generated by the current rise speed sensor component plus the second voltage drop (ΔU5) along the power switch is applied as a sum voltage (UΣ) to an input of the driver circuit,
wherein the driver circuit is configured to operate independently from a control unit of said apparatus to switch off the power switch within the switch-off period if the applied sum voltage (UΣ) exceeds a threshold voltage (UTH),
wherein the control unit is configured to control the driver circuit of the apparatus on reception of a control command from a user interface of the apparatus or from a remote device connected to the apparatus such that the power switch is switched either on or off in response to the received control command and
wherein the control unit is configured to control 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 of said apparatus, indicates an overload of the load connected to said apparatus.