US 12,413,079 B2
Power tool and method for carrying out charge equalization between accumulators in a power tool
Michael Lacher, Schwabmünchen (DE)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 18/561,547
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jun. 9, 2022, PCT No. PCT/EP2022/065661
§ 371(c)(1), (2) Date Nov. 16, 2023,
PCT Pub. No. WO2022/268514, PCT Pub. Date Dec. 29, 2022.
Claims priority of application No. 21181105 (EP), filed on Jun. 23, 2021.
Prior Publication US 2025/0088012 A1, Mar. 13, 2025
Int. Cl. H02J 7/00 (2006.01); B25F 5/00 (2006.01)
CPC H02J 7/0014 (2013.01) [B25F 5/00 (2013.01); H02J 7/0063 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A power tool comprising:
a first accumulator;
a second accumulator;
a first power electronics system with a first inverter;
a second power electronics system with a second inverter, wherein the first inverter is electrically connected to the first accumulator and the second inverter is electrically connected to the second accumulator;
the first power electronics system including a first charge equalizer and the second power electronics system including a second charge equalizer, the first and second charge equalizers configured to carry out charge equalization between the first and second accumulators; and
a speed controller, the speed controller connected upstream of the first and second charge equalizers;
the first and second power electronics system each having a current flow controller downstream of the first and second charge equalizers.