US 11,735,998 B2
System and method for protecting power semiconductor of half bridge converter
Julien Morand, Rennes (FR); and Stefan Mollov, Rennes (FR)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/298,180
Filed by MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
PCT Filed Nov. 14, 2019, PCT No. PCT/JP2019/045522
§ 371(c)(1), (2) Date May 28, 2021,
PCT Pub. No. WO2020/161986, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 19156069 (EP), filed on Feb. 7, 2019.
Prior Publication US 2022/0115945 A1, Apr. 14, 2022
Int. Cl. H02M 1/32 (2007.01); H02M 1/088 (2006.01); H02M 1/00 (2006.01); H02M 1/38 (2007.01)
CPC H02M 1/32 (2013.01) [H02M 1/0009 (2021.05); H02M 1/088 (2013.01); H02M 1/38 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system for protecting at least two power semiconductors of a half bridge converter, a drain of a first power semiconductor being connected to a positive power supply, a source of the first power semiconductor being connected to a load and to a drain of a second power semiconductor, a source of the second power semiconductor being connected to a negative power supply, wherein the current going through the first power semiconductor is sensed by a first Rogowski coil and a second Rogowski coil, the current going through the second semiconductor is sensed by a third Rogowski coil and a fourth Rogowski coil, the first Rogowski coil providing a positive voltage when the current going through the first power semiconductor increases and the second Rogowski coil providing a negative voltage when the current going through the first power semiconductor increases, the third Rogowski coil providing a positive voltage when the current going through the second power semiconductor increases and the fourth Rogowski coil providing a negative voltage when the current going through the second power semiconductor increases, and in that the system comprises:
circuitry for lowering the voltage on the gate of the first power semiconductor if the first and third Rogowski coils provide voltages of same sign,
circuitry for lowering the voltage on the gate of the second power semiconductor if the second and fourth Rogowski coils provide voltages of same sign.