US 12,395,111 B2
Overvoltage mitigation system
Renato Amorim Torres, Pontiac, MI (US); Suresh Gopalakrishnan, Troy, MI (US); Chandra S. Namuduri, Troy, MI (US); and Yilun Luo, Ann Arbor, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Dec. 11, 2023, as Appl. No. 18/534,864.
Prior Publication US 2025/0192714 A1, Jun. 12, 2025
Int. Cl. H02M 3/158 (2006.01); H02P 27/06 (2006.01); H02P 29/024 (2016.01)
CPC H02P 29/0241 (2016.02) [H02P 27/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric motor control system comprising:
an alternating current (AC) electric motor having a first phase input, a second phase input, and a third phase input;
an AC electrical energy source having a first phase output, a second phase output and a third phase output;
a first conductor coupled between the first phase output of the AC electrical energy source and the first phase input of the AC electric motor;
a second conductor coupled between the second phase output of the AC electrical energy source and the second phase input of the AC electric motor;
a third conductor coupled between the third phase output of the AC electrical energy source and the third phase input of the AC electric motor; and
circuitry that further includes:
a rectifier with a first rectifier phase input coupled to the first conductor, a second rectifier phase input coupled to the second conductor, and a third rectifier phase input coupled to the third conductor, the rectifier producing a rectified voltage between a positive rectifier output and a negative rectifier output;
an energy storage element coupled across the positive rectifier output and the negative rectifier output; and
at least one voltage limiting diode coupled to the positive rectifier output to limit a voltage of the positive rectifier output.