US 12,113,352 B2
Protection apparatus for a load resistor, and method for operating such a protection apparatus
Robert Lange, Crimmitschau (DE); and Marco Seja
Assigned to Siemens Aktiengesellschaft, Munich (DE)
Appl. No. 17/764,886
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Aug. 6, 2020, PCT No. PCT/EP2020/072093
§ 371(c)(1), (2) Date Mar. 29, 2022,
PCT Pub. No. WO2021/063569, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 19200374 (EP), filed on Sep. 30, 2019.
Prior Publication US 2022/0393458 A1, Dec. 8, 2022
Int. Cl. H02H 7/085 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/085 (2013.01) [H02H 1/0007 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A protection apparatus of a converter for operating an electric machine, said protection apparatus comprising:
a DC link including a first conductor and a second conductor;
a switching apparatus having a first switch and second switch;
a link capacitor;
a load resistor functioning as a combination of a precharge resistor and a braking resistor;
a semiconductor switch; and
an electrical fuse for protecting the load resistor,
wherein the electrical fuse and the first switch are electrically connected in series to the first conductor on one side of a series connection formed by the electrical fuse and the first switch, and electrically connected to a first resistor connection of the load resistor and to a first power connection of the semiconductor switch on another side of the series connection,
wherein the second switch is electrically connected to the first conductor on one side of the second switch and to a first capacitor connection of the link capacitor and to a second resistor connection of the load resistor on another side of the second switch, and
wherein the second conductor is electrically connected to a second power connection of the semiconductor switch and to a second capacitor connection of the link capacitor.