Back to results
US 2021/0344188 A1Published application
Protection circuit
AssigneeSiemens Aktiengesellschaft
InventorsYiran Chen, Peter Lonsdale
Life of this patent
Estimating the term…
Abstract
A protection circuit including an inrush current detector operable to detect an inrush current from a DC link is disclosed herein. The inrush current detector includes a transistor switch that is turned on in normal operation of the protection circuit. The protection circuit operates to detect when the voltage across the transistor switch exceeds a threshold voltage in response to a detected inrush current, and in response operates to turn off the transistor switch.
Claims18
A protection circuit comprising:
- an inrush current detector operable to detect an inrush current from a DC link,
- wherein the inrush current detector comprises a transistor switch that is turned on in normal operation of the protection circuit, and
- wherein the protection circuit is configured to detect when a voltage across the transistor switch exceeds a threshold voltage in response to a detected inrush current, and in response is configured to turn off the transistor switch.
A method of protecting components coupled to a DC link, the method comprising:
- detecting an inrush current from the DC link in a protection circuit, the protection circuit comprising a transistor switch that is turned on in normal operation of the protection circuit;
- and
- turning off the transistor switch in response to the detected inrush current when a voltage across the transistor switch exceeds a threshold voltage.
Dependencies are inferred from the claim text.